CN117277820A - Bidirectional CLLC resonant converter suitable for soft start and control method thereof - Google Patents
Bidirectional CLLC resonant converter suitable for soft start and control method thereof Download PDFInfo
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- CN117277820A CN117277820A CN202311270050.7A CN202311270050A CN117277820A CN 117277820 A CN117277820 A CN 117277820A CN 202311270050 A CN202311270050 A CN 202311270050A CN 117277820 A CN117277820 A CN 117277820A
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- 230000005284 excitation Effects 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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Classifications
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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
- H02M3/33584—Bidirectional converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/01—Resonant DC/DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
-
- 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
- H02M3/33573—Full-bridge at primary side of an isolation transformer
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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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a bidirectional CLLC resonant converter suitable for soft start and a control method thereof, and relates to the technical field of power electronic converters. The bidirectional CLLC resonant converter suitable for soft start comprises a first H bridge, a second H bridge and a resonant cavity connected between the first H bridge and the second H bridge, wherein the resonant cavity comprises a high-frequency transformer T 1 A first resonance capacitor Cr, a resonance inductance Lr and a second resonance capacitor Cp, wherein the first resonance capacitor Cr is connected in series with the high-frequency transformer T 1 The second resonant capacitor Cp is connected in parallel with a resonant inductor Lr connected in series to the high-frequency transformer T 1 And a second H-bridge. The inventionThe converter switching tube has a simple structure, can realize bidirectional power transmission, ensures that current steadily rises in the starting process, effectively reduces current overshoot, can realize soft switching of the converter switching tube in the whole process, and effectively ensures normal operation of the converter.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a bidirectional CLLC resonant converter suitable for soft start and a control method thereof.
Background
The bidirectional CLL resonant converter can operate bidirectionally when operating in a fixed frequency mode, has simple topology and control method, and has the advantages of light weight, small volume, high power density and high efficiency. However, when the resonant converter and the control mode thereof are started up, because the resonant converter has larger gain, the problem of current overshoot exists, and related devices of the resonant converter can be burnt out when serious, thereby affecting the reliability of products.
One of the traditional ways is to use a high-frequency start with a fixed duty cycle of 50% on the basis that the initial switching frequency is greater than the resonant frequency, and then slowly reduce the switching frequency to the resonant frequency, but this way makes the gain change of the resonant converter very small and cannot effectively reduce the current overshoot problem. The other mode is that the duty ratio is slowly increased from 0 to 50% after the frequency is fixed, and the primary side current can be reduced to a certain extent, but the situation that a switching tube of a converter cannot be switched on or off softly exists in the starting process, so that the driving signal of the switching tube can be seriously oscillated, the electromagnetic interference of the converter is serious, the switching loss is increased and the like.
The patent with publication number CN 115765426A discloses a CLLC resonant converter soft start optimal track control method, which can realize that the resonance current peak value in the soft start process does not exceed the limited maximum value under any load condition by arranging a symmetrical current limiting band, and the start process is quick and smooth, so that the voltage and current stress is effectively reduced, but the structure and the control mode are complex.
Disclosure of Invention
The bidirectional CLLC resonant converter and the control method thereof, provided by the invention, have the advantages that the structure is simple, the bidirectional power transmission can be realized, the current is ensured to steadily rise in the starting process, the current overshoot is effectively reduced, the soft switching of the converter switching tube in the whole process can be realized, and the normal operation of the converter is effectively ensured.
In order to solve the technical problems, the invention provides the following technical scheme:
a bidirectional CLLC resonant converter suitable for soft start comprises a first H bridge, a second H bridge and a resonant cavity connected between the first H bridge and the second H bridge, wherein the resonant cavity comprises a high-frequency transformer T 1 A first resonance capacitor Cr, a resonance inductance Lr and a second resonance capacitor Cp, wherein the first resonance capacitor Cr is connected in series with the high-frequency transformer T 1 The second resonant capacitor Cp is connected in parallel with a resonant inductor Lr connected in series to the high-frequency transformer T 1 And a second H-bridge.
Further, a first bus capacitor C is connected to the DC side of the first H bridge 9 The direct current side of the second H bridge is connected with a second bus capacitor C 10 。
Further, the first H bridge comprises a switch tube Q 1 Switch tube Q 2 Switch tube Q 3 And a switching tube Q 4 The second H bridge comprises a switch tube Q 5 Switch tube Q 6 Switch tube Q 7 And a switching tube Q 8 The switch tube Q 1 Switch tube Q 4 Switch tube Q 6 Switch tube Q 7 Is the same as the driving signal of the switch tube Q 2 Switch tube Q 3 Switch tube Q 5 Switch tube Q 8 The drive signals of the two sets of drive signals are identical and the two sets of drive signals are complementary.
Further, the equivalent model of the bidirectional CLLC resonant converter during forward operation comprises a first resonant capacitor Cr and a high-frequency transformer T 1 Primary excitation inductance lm_p, equivalent resonance inductance lreq_p, second equivalent resonance capacitance cpeq_p and first equivalent alternating current impedance raceq_p, wherein the equivalent resonance inductance lreq_p is obtained by enabling resonance inductance Lr to be equivalent to a high-frequency transformer T when the bidirectional CLLC resonant converter works in the forward direction 1 The equivalent resonant inductance of the primary side, the second equivalent resonant capacitance Cpeq_p is the positive of the bidirectional CLLC resonant converterTo the second resonant capacitance Cp being equivalent to the high-frequency transformer T when in operation 1 The primary side equivalent resonance capacitor, the first equivalent alternating current impedance Raceq_p is the equivalent of the secondary side circuit to the high frequency transformer T when the bidirectional CLLC resonant converter works in the forward direction 1 Equivalent ac impedance on the primary side.
Further, the series resonant frequency of the bidirectional CLLC resonant converter during forward operation is:
the notch frequency is:
further, the equivalent model of the bidirectional CLLC resonant converter includes a resonant inductor Lr, a second resonant capacitor Cp, and a high-frequency transformer T during reverse operation 1 The secondary side excitation inductance Lm_n, a first equivalent resonance capacitor Creq_n and an equivalent alternating current impedance Raceq_n, wherein the first equivalent resonance capacitor Creq_n is equivalent to a high-frequency transformer T from a first resonance capacitor Cr when the bidirectional CLLC resonant converter works reversely 1 The equivalent resonance capacitance of the secondary side, the equivalent alternating-current impedance Raceq_n is the equivalent of the primary side circuit to the high-frequency transformer T when the bidirectional CLLC resonant converter works reversely 1 Equivalent ac impedance on the secondary side.
Further, the series resonant frequency of the bidirectional CLLC resonant converter during reverse operation is:
the notch frequency is:
further, the forward gain and the reverse gain of the bidirectional CLLC resonant converter are the same.
A control method of a bidirectional CLLC resonant converter suitable for soft start adopts an exponential normalized frequency change function to adjust the gain of the bidirectional CLLC resonant converter.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a bidirectional CLLC resonant converter suitable for soft start and a control method thereof, wherein the resonator is designed to be connected in series with a high-frequency transformer T by a first resonant capacitor Cr 1 Between the primary side of (1) and the first H bridge, the second resonant capacitor Cp is connected in parallel with the resonant inductor Lr and then connected in series to the high-frequency transformer T 1 The secondary side of the resonant converter is connected with the second H bridge, the initial switching frequency can be reduced from a notch frequency point to a series resonance frequency point, the gain curve of the resonant converter is changed while the bidirectional power transmission function is not changed, the gain of the resonant converter is gradually increased from 0 to 1 in the starting process, the overshoot current of the converter in the starting process is effectively reduced, and the resonant converter has the characteristics of few resonant devices, simple control strategy and reliable operation of the resonant converter.
Drawings
FIG. 1 is a schematic diagram of a gain curve of a prior art bi-directional CLL resonant converter;
FIG. 2 is a schematic circuit diagram of a bi-directional CLLC resonant converter suitable for soft start according to the present invention;
FIG. 3 is a schematic diagram of an equivalent model structure of the bidirectional CLLC resonant converter suitable for soft start in forward operation;
FIG. 4 is a schematic diagram of an equivalent model structure of the bi-directional CLLC resonant converter suitable for soft start in reverse operation according to the present invention;
FIG. 5 is a schematic diagram of the gain curve of a bi-directional CLLC resonant converter suitable for soft start according to the present invention;
fig. 6 is a graph of gain curve fitted as a function of time for normalized frequency of a bi-directional CLLC resonant converter suitable for soft start in accordance with the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
In one aspect, the present invention provides a bidirectional CLLC resonant converter suitable for soft start, as shown in fig. 2-6, comprising a first H-bridge, a second H-bridge, and a resonant cavity connected between the first H-bridge and the second H-bridge, the resonant cavity comprising a high frequency transformer T 1 The first resonant capacitor Cr, the resonant inductor Lr and the second resonant capacitor Cp, wherein the two ends of the first resonant capacitor Cr are respectively connected to the high-frequency transformer T 1 The primary side of the first H bridge and the point a of the left bridge arm of the first H bridge, a second resonant capacitor Cp is connected in parallel with a resonant inductor Lr, and two ends of the resonant inductor Lr are respectively connected to the high-frequency transformer T 1 D point of the secondary side of (c) and the left leg of the second H-bridge.
In an embodiment of the present invention, a DC side of the first H bridge is connected with a first bus capacitor C 9 The direct current side of the second H bridge is connected with a second bus capacitor C 10 。
In one embodiment of the present invention, the first H-bridge includes a switching tube Q 1 Switch tube Q 2 Switch tube Q 3 And a switching tube Q 4 The second H bridge comprises a switch tube Q 5 Switch tube Q 6 Switch tube Q 7 And a switching tube Q 8 . The driving mode of the bidirectional CLLC resonant converter is as follows: switch tube Q 1 Switch tube Q 4 Switch tube Q 6 Switch tube Q 7 Is the same as the driving signal of the switch tube Q 2 Switch tube Q 3 Switch tube Q 5 Switch tube Q 8 The driving signals of the two groups of driving signals are the same, the two groups of driving signals are complementary, and PWM waves with fixed frequency and 50% duty ratio are adopted by the two groups of driving signals.
As shown in FIG. 3, the equivalent model of the bidirectional CLLC resonant converter in the embodiment of the invention comprises a first resonant capacitor Cr and a high-frequency transformer T in the forward operation 1 Primary excitation inductance lm_p, equivalent resonance inductance lreq_p, second equivalent resonance capacitance cpeq_p and first equivalent alternating current impedance raceq_p, wherein the equivalent resonance inductance lreq_p is the resonance inductance Lr equivalent to the high-frequency transformer T when the bidirectional CLLC resonant converter works in the forward direction 1 The equivalent resonant inductance of the primary side,the second equivalent resonant capacitor Cpeq_p is equivalent to the high-frequency transformer T when the bidirectional CLLC resonant converter works in the forward direction 1 The primary side equivalent resonance capacitor, the first equivalent alternating current impedance Raceq_p is the equivalent of the secondary side circuit to the high frequency transformer T when the bidirectional CLLC resonant converter works in the forward direction 1 Equivalent ac impedance on the primary side.
In one embodiment of the present invention, the series resonant frequency of the bidirectional CLLC resonant converter when operating in the forward direction is:
the notch frequency is:
while the forward gain of the bi-directional CLLC resonant converter:
wherein k is l_p Inductance in forward operation
k c_p For capacitance coefficient in forward operation
Q p Circuit quality factor for forward operation
As shown in fig. 4, the equivalent model of the bidirectional CLLC resonant converter in the embodiment of the present invention includes a resonant inductor Lr, a second resonant capacitor Cp, a secondary side excitation inductor lm_n of the high-frequency transformer T1, a first equivalent resonant capacitor creq_n and an equivalent ac impedance raceq_n, where the first equivalent resonant capacitor creq_n is an equivalent resonant capacitor of the first resonant capacitor Cr equivalent to the secondary side of the high-frequency transformer T1 when the bidirectional CLLC resonant converter is in reverse operation, and the equivalent ac impedance raceq_n is an equivalent ac impedance of the primary side circuit equivalent to the secondary side of the high-frequency transformer T1 when the bidirectional CLLC resonant converter is in reverse operation.
The series resonant frequency of the bidirectional CLLC resonant converter when operating in reverse is:
the notch frequency is:
reverse gain of bi-directional CLLC resonant converter:
wherein k is l_n For inductance in reverse operation
k c_n For capacitance coefficient in reverse operation
Q n For circuit quality factor in reverse operation
It can be seen, therefore, that in the embodiments of the present invention, the forward gain and the reverse gain of the bidirectional CLLC resonant converter are the same. From this conclusion, the gain curve of the bidirectional CLLC resonant converter can be plotted, as shown in fig. 5, from the notch frequency point to the series resonant frequency point, that is, from the normalized frequency Fn from 2 to 1, the gain of the bidirectional CLLC resonant converter gradually increases from 0 to 1, but the gain change is nonlinear, the frequency begins to decrease from fn=2, the gain change is faster, the frequency approaches fn=1, and the gain change is slower.
Therefore, the invention provides a control method of a bidirectional CLLC resonant converter suitable for soft start, which adopts an exponential normalized frequency change function to adjust the gain of the bidirectional CLLC resonant converter, so that the gain of the bidirectional CLLC resonant converter is approximately linearly changed, the starting current is more gentle, and the overshoot current is effectively reduced.
In an embodiment of the present invention, soft start time is set to 0.5s, and an exponential normalized frequency change function is adopted as follows:
Fn(t)＝2-e (10t-5) ，t≤0.5
the gain curve of the bi-directional CLLC resonant converter fitted as a function of normalized frequency with respect to time is shown in fig. 6. When t is from 0 to 0.5s, the gain of the bidirectional CLLC resonant converter is nearly linearly increased, so that the starting current of the converter is effectively controlled, and the overshoot current is reduced. In addition, the frequency change range in the whole starting process of the converter is a ZVS region, so that the switching tube of the converter can realize ZVS.
Whereas the gain curve of the prior art bi-directional CLL resonant converter is shown in fig. 1, it can be seen from fig. 1 that the gain of the bi-directional CLL resonant converter varies very little at the section Fn from 2 to 1, with a gain slightly less than 1. This is why the bi-directional CLL resonant converter cannot effectively reduce the overshoot current even if the frequency is increased.
In summary, by adopting the bidirectional CLLC resonant converter and the control method suitable for soft start, in the soft start process, the switching frequency is reduced from a notch frequency point to a series resonant frequency point, the gain of the converter is gradually increased from 0 to 1 approximately linearly, the overshoot current of the converter during start is effectively reduced, and the switching tube of the converter in the whole process can realize soft switching.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (9)
1. A bidirectional CLLC resonant converter suitable for soft start, comprising a first H bridge, a second H bridge and a resonant cavity connected between the first H bridge and the second H bridge, wherein the resonant cavity comprises a high-frequency transformer T 1 A first resonance capacitor Cr, a resonance inductance Lr and a second resonance capacitor Cp, wherein the first resonance capacitor Cr is connected in series with the high-frequency transformer T 1 The second resonant capacitor Cp is connected in parallel with a resonant inductor Lr connected in series to the high-frequency transformer T 1 And a second H-bridge.
2. The bidirectional CLLC resonant converter of claim 1, wherein the dc side of the first H-bridge is connected to a first bus capacitor C 9 The direct current side of the second H bridge is connected with a second bus capacitor C 10 。
3. The bi-directional CLLC resonant converter of claim 1, wherein the first H-bridge comprises a switching tube Q 1 Switch tube Q 2 Switch tube Q 3 And a switching tube Q 4 The second H bridge comprises a switch tube Q 5 Switch tube Q 6 Switch tube Q 7 And a switching tube Q 8 The switch tube Q 1 Switch tube Q 4 Switch tube Q 6 Switch tube Q 7 Is the same as the driving signal of the switch tube Q 2 Switch tube Q 3 Switch tube Q 5 Switch tube Q 8 The drive signals of the two sets of drive signals are identical and the two sets of drive signals are complementary.
4. The bidirectional CLLC resonant converter of claim 1, wherein the equivalent model of the bidirectional CLLC resonant converter during forward operation comprises a first resonant capacitor Cr, a high frequency transformer T 1 Primary excitation inductance lm_p, equivalent resonance inductance lreq_p, second equivalent resonance capacitance cpeq_p and first equivalent alternating current impedance raceq_p, wherein the equivalent resonance inductance lreq_p is obtained by enabling resonance inductance Lr to be equivalent to a high-frequency transformer T when the bidirectional CLLC resonant converter works in the forward direction 1 The primary equivalent resonant inductance is the second equivalent resonant capacitance Cpeq_p equivalent to the high-frequency transformer T when the bidirectional CLLC resonant converter works in the forward direction 1 The primary side equivalent resonance capacitor, the first equivalent alternating current impedance Raceq_p is the equivalent of the secondary side circuit to the high frequency transformer T when the bidirectional CLLC resonant converter works in the forward direction 1 Equivalent ac impedance on the primary side.
5. The bi-directional CLLC resonant converter of claim 4, wherein the series resonant frequency of the bi-directional CLLC resonant converter when operating in forward direction is:
the notch frequency is:
6. the bi-directional CLLC resonant converter of claim 4, wherein the bi-directional CLLC resonant circuit comprises a plurality of windingsThe equivalent model comprises a resonant inductance Lr, a second resonant capacitance Cp and a high-frequency transformer T when the converter works reversely 1 The secondary side excitation inductance Lm_n, a first equivalent resonance capacitor Creq_n and a second equivalent alternating current impedance Raceq_n, wherein the first equivalent resonance capacitor Creq_n is equivalent to a high-frequency transformer T from a first resonance capacitor Cr when the bidirectional CLLC resonant converter works reversely 1 The equivalent resonance capacitance of the secondary side, the second equivalent alternating current impedance Raceq_n is the equivalent of the primary side circuit to the high-frequency transformer T when the bidirectional CLLC resonant converter works reversely 1 Equivalent ac impedance on the secondary side.
7. The bi-directional CLLC resonant converter of claim 6, wherein the series resonant frequency of the bi-directional CLLC resonant converter when operating in reverse is:
the notch frequency is:
8. the bi-directional CLLC resonant converter of claim 4, wherein the forward gain and the reverse gain of the bi-directional CLLC resonant converter are the same.
9. A method of controlling a bi-directional CLLC resonant converter suitable for soft start as claimed in any one of claims 1-8, characterized in that the gain of the bi-directional CLLC resonant converter is adjusted using an exponentially normalized frequency variation function.
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| CN202311270050.7A CN117277820A (en) | 2023-09-28 | 2023-09-28 | Bidirectional CLLC resonant converter suitable for soft start and control method thereof |
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| CN202311270050.7A CN117277820A (en) | 2023-09-28 | 2023-09-28 | Bidirectional CLLC resonant converter suitable for soft start and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230032942A1 (en) * | 2021-08-02 | 2023-02-02 | Transient Plasma Systems, Inc. | Power converter comprising series resonant converter(s) having a full-bridge series resonant topology and methods of operating same |
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| CN115864813A (en) * | 2022-12-29 | 2023-03-28 | 清华四川能源互联网研究院 | Soft start device and method for CLLC resonant converter |
| CN116683771A (en) * | 2023-05-30 | 2023-09-01 | 西南交通大学 | Isolation type three-port converter based on double wave traps and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230032942A1 (en) * | 2021-08-02 | 2023-02-02 | Transient Plasma Systems, Inc. | Power converter comprising series resonant converter(s) having a full-bridge series resonant topology and methods of operating same |
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