CN210380663U - Bidirectional multipath parallel full-bridge LLC resonant converter - Google Patents
Bidirectional multipath parallel full-bridge LLC resonant converter Download PDFInfo
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- CN210380663U CN210380663U CN201921663194.8U CN201921663194U CN210380663U CN 210380663 U CN210380663 U CN 210380663U CN 201921663194 U CN201921663194 U CN 201921663194U CN 210380663 U CN210380663 U CN 210380663U
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- 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
A bidirectional multipath parallel full-bridge LLC resonant converter comprises an LLC resonant converter module, wherein the LLC resonant converter module consists of two LLC resonant converter units connected in parallel, and each LLC resonant converter unit comprises a switch network, a resonant network and a rectifying network which are connected in sequence; the resonant network is an LLC resonant cavity and comprises a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm and a current sharing inductor Lb which are connected in series. Because the current sharing inductors Lb of the two LLC resonant converter units are mutually inductive, the two LLC units realize automatic current sharing under the condition of not increasing any control strategy, and the method is simple and reliable in operation.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a bidirectional multi-path parallel full-bridge LLC resonant converter.
Background
With the development of power electronic technology, people's demand for various electronic products is increasing day by day. For small-power portable products, people pursue small and portable products; for high power products, people are pursuing higher efficiency due to concerns about energy shortage and environmental pollution. In the field of power electronics, the requirements for power supply products are also increasing, and high efficiency and high power density are targets for continuous pursuit of optimization of power supply products.
The volume of the magnetic element can be obviously reduced by increasing the working frequency of the power supply, and the power density is favorably improved. Due to advances in semiconductor technology, the switching frequency of power supplies has increased. However, an increase in the switching frequency also means an increase in the switching losses of the circuit, which in turn limits the increase in the power density of the switching power supply. In order to take into account high frequencies and small losses, software switching techniques are applied. The software switching technology is to reduce the voltage or current to zero before the switching tube is turned on or off, thereby reducing the switching loss. The additional circuit elements and control strategies required to implement soft switching increase the cost of the switching power supply. The direct current resonant converter has the characteristic of periodic zero crossing of current or voltage, and can realize soft switching through the characteristics of topology under the appropriate parameters and control. Because the resonant converter usually uses frequency conversion voltage regulation control, the design of a control loop is difficult, and compared with a commonly used PWM control type topology, the reliability is insufficient, so that the resonant converter is not applied on a large scale before. Until recently, research into LLC resonant converters has been more intensive. It is popular because of its advantages of simple structure, low loss, high power density, etc., and is widely used in the fields of PC power supply, communication, aerospace, etc.
With the more deep and wide application of the LLC resonant soft switching circuit, the advantages of the LLC are perfectly embodied: firstly, the soft switching characteristic of the LLC can realize Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) of the secondary rectifier without adding any additional circuit, and achieve the target requirements of high efficiency and high frequency; secondly, the soft switching is realized regardless of load conditions, and the soft switching is realized in the same way in the whole load range without increasing the control complexity; and thirdly, the magnetic integration technology can be realized on certain specific occasions with low power or high power, and the magnetic integrated circuit has no output filter inductor, low cost and small volume. The LLC resonant soft switching circuit has the advantages that because no output filter inductor exists, particularly in a high-power low-voltage occasion, an output ripple circuit is very large, and great influence is generated on the number, temperature rise and service life of filter capacitors, so that the requirement of the staggered LLC parallel connection is very urgent, output current ripples can be effectively reduced after the LLC parallel connection is staggered, and adverse influence on the output filter capacitors is greatly reduced.
The technical problem to be solved by the parallel full-bridge LLC resonant converter is the current sharing problem, namely how to distribute load current evenly, and meanwhile, the output voltage meets the requirement of ensuring the stability of a system. If the load current can not be guaranteed to be evenly divided, the output current of some LLC resonant converters is required to be larger, and the output current of other LLC resonant converters is required to be smaller or even not output. This may result in increased thermal stress of the LLC resonant converter sharing more current, reducing the reliability of the system. In addition, in order to realize reliable LLC resonant converter parallel connection, the problems of improving the fault-tolerant capability and the dynamic response speed of a system, reducing noise and the like are solved.
Disclosure of Invention
The invention mainly solves the technical problem of current sharing of the parallel full-bridge LLC resonant converter.
According to a first aspect, an embodiment provides a bidirectional multi-path parallel full-bridge LLC resonant converter, comprising an LLC resonant converter module;
the LLC resonant converter module comprises two LLC resonant converter units connected in parallel;
each LLC resonant converter unit comprises two input terminals; one input end of one LLC resonant converter unit is connected with one input end of another LLC resonant converter unit and used as one input end of the LLC resonant converter module; the other input terminal of the one LLC resonant converter unit is connected with the other input terminal of the other LLC resonant converter unit as the other input terminal of the LLC resonant converter module; two input ends of the LLC resonant converter module are used as two input ends of the full-bridge LLC resonant converter and are used for being connected to two ends of a power supply;
each LLC resonant converter unit comprises two output ends, one output end of one LLC resonant converter unit is connected with one output end of the other LLC resonant converter unit and is used as one output end of the LLC resonant converter module; another output terminal of the one LLC resonant converter unit is connected to another output terminal of the another LLC resonant converter unit as another output terminal of the LLC resonant converter module; two output ends of the LLC resonant converter module are used as two output ends of the full-bridge LLC resonant converter and are used for being connected to two ends of a load;
each LLC resonant converter unit comprises a switch network, a resonant network and a rectifying network which are connected in sequence;
the switching network comprises two parallel bridge arms, and two ends of each bridge arm are respectively used as two input ends of the LLC resonant converter unit; one bridge arm comprises a first switching tube Q1 and a second switching tube Q2 which are connected in series, and the other bridge arm comprises a third switching tube Q3 and a fourth switching tube Q4 which are connected in series;
the resonant network is an LLC resonant cavity and comprises a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm and a current sharing inductor Lb which are connected in series; one end of the resonant network is connected to a bridge arm between the first switching tube Q1 and the second switching tube Q2, and the other end of the resonant network is connected to a bridge arm between the third switching tube Q3 and the fourth switching tube Q4;
the rectifier network comprises a first transformer T1 and a rectifier bridge circuit;
two ends of a primary side of the first transformer T1 are connected in parallel to two ends of the transformer excitation inductor L;
two ends of the secondary side of the first transformer T1 are connected with two input ends of the rectifier bridge circuit;
two output ends of the rectifier bridge circuit are respectively used as two output ends of the LLC resonant converter unit;
and the current sharing inductors Lb of the two LLC resonant converter units are mutually mutual inductance.
Further, the LLC resonant converter module further includes a second transformer T2, and a primary side and a secondary side of the second transformer T2 are respectively used as current sharing inductors Lb of the two LLC resonant converter units.
Further, the connection directions of the current sharing inductors Lb of the two LLC resonant converter units are opposite.
Further, the LLC resonant converter module further includes a load capacitor connected in parallel between two output terminals of the full-bridge LLC resonant converter.
Further, the resonant network is sequentially connected in series with a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm and a current sharing inductor Lb.
Further, the resonant network is sequentially connected in series with a current-sharing inductor Lb, a resonant capacitor Cs, a resonant inductor Ls and a transformer excitation inductor Lm.
Further, the resonant network is sequentially connected in series with a resonant capacitor Cs, a current sharing inductor Lb, a resonant inductor Ls and a transformer excitation inductor Lm.
Further, the resonant network is sequentially connected in series with a resonant capacitor Cs, a resonant inductor Ls, a current sharing inductor Lb and a transformer excitation inductor Lm.
Further, the resonant network is sequentially connected in series with a current-sharing inductor Lb, a resonant inductor Ls, a transformer excitation inductor Lm and a resonant capacitor Cs;
or the resonance network is sequentially connected in series with a resonance inductor Ls, a current sharing inductor Lb, a transformer excitation inductor Lm and a resonance capacitor Cs;
or the resonance network is sequentially connected in series with a resonance inductor Ls, a transformer excitation inductor Lm, a current sharing inductor Lb and a resonance capacitor Cs;
or the resonance network is sequentially connected in series with a resonance inductor Ls, a transformer excitation inductor Lm, a resonance capacitor Cs and a current sharing inductor Lb.
Further, the LLC resonant converter module comprises N LLC resonant converter modules, wherein N is a natural number greater than 1; two input ends of each LLC resonant converter module are respectively connected with two input ends of the full-bridge LLC resonant converter; and two output ends of each LLC resonant converter module are respectively connected with two output ends of the full-bridge LLC resonant converter.
According to the bidirectional multipath parallel full-bridge LLC resonant converter of the embodiment, the LLC resonant converter module comprises two LLC resonant converter units which are connected in parallel, and each LLC resonant converter unit comprises a switch network, a resonant network and a rectifying network which are connected in sequence; the resonant network is an LLC resonant cavity and comprises a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm and a current sharing inductor Lb which are connected in series. Because the current sharing inductors Lb of the two LLC resonant converter units are mutually inductive, the two LLC units realize automatic current sharing under the condition of not increasing any control strategy, and the method is simple and reliable in operation.
Drawings
FIG. 1 is a circuit schematic diagram of a parallel full bridge LLC converter;
FIG. 2 is a schematic circuit diagram of another two-way interleaved parallel full-bridge LLC resonant converter;
FIG. 3 is a circuit diagram of a bidirectional multi-path parallel full-bridge LLC resonant converter in an embodiment;
FIG. 4 is a schematic diagram of the mutual inductance current sharing inductor;
FIG. 5 is a graphical representation of cavity parameters α and b in one embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In the prior art, the interleaved LLC parallel connection has the same working frequency and mutually different driving by 90 °, which is now described by connecting two forward LLC in parallel. Referring to fig. 1, a circuit diagram of a parallel full-bridge LLC converter includes a resonant capacitor Cs, a resonant inductor Ls, and a transformer Tr. The elements with the same design parameters are used, the working frequencies are the same under an ideal state, the powers of the two LLC circuits are the same, but in practical application, because the electrical parameters of the resonant cavity elements have errors, the PCB wiring and element layout of the two LLC circuits are not completely symmetrical with the input and output, the two LLC circuits are directly connected in parallel to generate an uneven power condition, even one LLC circuit is basically in an idle state in serious conditions, if the two LLC circuits are separately controlled, staggered parallel connection cannot be realized due to the frequency modulation characteristic of the LLC circuits, and meanwhile, the cost and the control complexity are increased. In order to solve the above problem, please refer to fig. 2, which is a schematic circuit diagram of another two-way interleaved parallel full-bridge LLC resonant converter, after three-phase Wienna rectification, the rectified voltage Vin is input into an interleaved parallel DC/DC converter, two capacitors are sampled and connected in series to divide the voltage into Bus1 and Bus2, each capacitor is connected to one way of LLC, the other side of LLC is connected in parallel, after stable operation, based on the capacitance as S balance, the currents flowing into the two ways of LLC are the same, and the uniform power of the two ways of LLC is realized. However, the circuit has the following disadvantages:
1) circuits only suitable for high voltage Vin, low voltage circuits can reduce efficiency;
2) the Bus1 and the Bus2 work respectively, the ripple current of the capacitor is not staggered, and the ripple current cannot be lowered;
3) the phenomenon of uneven pressure of Bus1 and Bus2 exists during reverse work starting, and the difficulty and risk of reverse soft starting are increased.
In the embodiment of the invention, the bidirectional multipath parallel full-bridge LLC resonant converter comprises an LLC resonant converter module, wherein the LLC resonant converter module consists of two LLC resonant converter units which are connected in parallel, and each LLC resonant converter unit comprises a switch network, a resonant network and a rectifying network which are connected in sequence; the resonant network is an LLC resonant cavity and comprises a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm and a current sharing inductor Lb which are connected in series. Because the current sharing inductors Lb of the two LLC resonant converter units are mutually inductive, the two LLC units realize automatic current sharing under the condition of not increasing any control strategy, and the method is simple and reliable in operation.
Example one
Referring to fig. 3, it is a circuit diagram of a bidirectional multi-path parallel full-bridge LLC resonant converter in an embodiment, which includes an LLC resonant converter module, a power supply 1 and a load 5, where the LLC resonant converter module includes two LLC resonant converter units connected in parallel, that is, a first LLC resonant converter unit 2 and a second LLC resonant converter unit 3. Each LLC resonant converter unit comprises two input terminals, one input terminal of one LLC resonant converter unit is connected with one input terminal of another LLC resonant converter unit as one input terminal of the LLC resonant converter module, the other input terminal of one LLC resonant converter unit is connected with the other input terminal of another LLC resonant converter unit as the other input terminal of the LLC resonant converter module, the two input terminals of the LLC resonant converter module are used as the two input terminals of the full-bridge LLC resonant converter for connection at the two ends of the power supply 1. Each LLC resonant converter unit comprises two output terminals, one output terminal of one LLC resonant converter unit is connected with one output terminal of another LLC resonant converter unit as one output terminal of the LLC resonant converter module, the other output terminal of one LLC resonant converter unit is connected with the other output terminal of another LLC resonant converter unit as the other output terminal of the LLC resonant converter module, the two output terminals of the LLC resonant converter module are used as the two output terminals of the full-bridge LLC resonant converter for connection at the two ends of the load 5.
Each LLC resonant converter unit has the same circuit structure, and includes a switching network, a resonant network, and a rectifying network connected in sequence, i.e., the first LLC resonant converter unit 2 includes a switching network 21, a resonant network, and a rectifying network 22, and the second LLC resonant converter unit 3 includes a switching network 31, a resonant network, and a rectifying network 32.
In the first LLC resonant converter unit 2, the switch network 21 includes two parallel-connected bridge arms, two ends of each bridge arm are respectively used as two input ends of the second LLC resonant converter unit 2, wherein one bridge arm includes a first switching tube Q1 and a second switching tube Q2 connected in series, and the other bridge arm includes a third switching tube Q3 and a fourth switching tube Q4 connected in series. The resonant network of the first LLC resonant converter unit 2 is an LLC resonant cavity, and includes a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm, and a current-sharing inductor Lb connected in series, one end of the resonant network is connected to the bridge arm between the first switching tube Q1 and the second switching tube Q2, and the other end of the resonant network is connected to the bridge arm between the third switching tube Q3 and the fourth switching tube Q4. The rectifier network 22 includes a first transformer T1 and a rectifier bridge circuit 221, two ends of a primary side of the first transformer T1 are connected in parallel to two ends of a transformer excitation inductance Lm, and two ends of a secondary side of the first transformer T1 are connected to two input ends of the rectifier bridge circuit 221. Two output terminals of the rectifier bridge circuit 221 are respectively used as two output terminals of the first LLC resonant converter unit 2.
In the second LLC resonant converter unit 3, the switching network 31 includes two parallel-connected bridge arms, two ends of each bridge arm are respectively used as two input ends of the second LLC resonant converter unit 3, wherein one bridge arm includes a fifth switching tube Q5 and a sixth switching tube Q6 connected in series, and the other bridge arm includes a seventh switching tube Q7 and an eighth switching tube Q8 connected in series. The resonant network of the second LLC resonant converter unit 3 is an LLC resonant cavity, and includes a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm, and a current-sharing inductor Lb connected in series, one end of the resonant network is connected to the bridge arm between the fifth switching tube Q5 and the sixth switching tube Q6, and the other end of the resonant network is connected to the bridge arm between the seventh switching tube Q7 and the eighth switching tube Q8. The rectifier network 32 of the second LLC resonant converter unit 3 includes a third transformer T3 and a rectifier bridge circuit 321, two ends of the primary side of the third transformer T3 are connected in parallel to two ends of the transformer excitation inductance Lm, and two ends of the secondary side of the third transformer T3 are connected to two input ends of the rectifier bridge circuit 321. Two output terminals of the rectifier bridge circuit 321 of the second LLC resonant converter unit 3 are used as two output terminals of the second LLC resonant converter unit 3, respectively. The current sharing inductances Lb of the two parallel LLC resonant converter units are mutually inductive, i.e. the current sharing inductances Lb of the resonant networks in the first LLC resonant converter unit 2 and the second LLC resonant converter unit 3 are mutually inductive. In an embodiment, the LLC resonant converter module further includes a second transformer T2, and the primary side and the secondary side of the second transformer T2 are respectively used as current sharing inductors Lb of the two LLC resonant converter units. In one embodiment, the connection directions of the current sharing inductors Lb of the two LLC resonant converter units are opposite. In an embodiment, the LLC resonant converter module further comprises a load capacitor 4 connected in parallel between two output terminals of the full-bridge LLC resonant converter. In one embodiment, the load 5 is a resistor.
In one embodiment, the inductance of the current sharing inductor Lb is 0.2-0.5 times that of the resonant inductor Ls.
In one embodiment, the resonant network is sequentially connected in series by a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm and a current sharing inductor Lb. In one embodiment, the resonant network is sequentially connected in series by a current sharing inductor Lb, a resonant capacitor Cs, a resonant inductor Ls and a transformer excitation inductor Lm. In one embodiment, the resonant network is sequentially connected in series by a resonant capacitor Cs, a current sharing inductor Lb, a resonant inductor Ls and a transformer excitation inductor Lm. In one embodiment, the resonant network is sequentially connected in series by a resonant capacitor Cs, a resonant inductor Ls, a current sharing inductor Lb and a transformer excitation inductor Lm. In one embodiment, the resonant network is sequentially connected in series by a current sharing inductor Lb, a resonant inductor Ls, a transformer excitation inductor Lm and a resonant capacitor Cs; or the resonance network is sequentially connected in series with a resonance inductor Ls, a current sharing inductor Lb, a transformer excitation inductor Lm and a resonance capacitor Cs; or the resonance network is sequentially connected in series with a resonance inductor Ls, a transformer excitation inductor Lm, a current sharing inductor Lb and a resonance capacitor Cs; or the resonance network is sequentially connected in series with the resonance inductor Ls, the transformer excitation inductor Lm, the resonance capacitor Cs and the current sharing inductor Lb.
In the embodiment of the present application, the switching network and the rectifying network are full-bridge switching circuits, and may also be a half-bridge switching circuit and a middle tap circuit, respectively. In the embodiment of the present application, the resonant inductor Ls and the transformer may be separated or may be magnetically integrated. In the embodiment of the application, the LLC resonant converter unit is a unidirectional circuit and can also be a bidirectional conversion circuit, but current sharing inductors are connected in series with the resonant cavity. In the embodiment of the application, the switch network adopts closed-loop control and can also be applied to an open-loop circuit.
For the technical problem of uneven power of two forward LLC circuits connected in parallel, one reason is that resonant frequencies of the two circuits are inevitably different due to different resonant capacitances Cs and resonant inductances Ls in the resonant networks of the two LLC resonant converter units, so that gain curves of the two LLC resonant converter units are also inconsistent, and under the same working frequency, due to different gains, output voltages are different and output currents are also different. Aiming at the mechanism of the power inequality, in the embodiment of the application, a current sharing inductor Lb is respectively connected in series into resonant cavities of two LLC resonant converter units connected in parallel, the two current sharing inductors Lb are mutually mutual-inductive, when currents of two LLC circuits are different, the two current sharing inductors Lb adjust total resonant inductance in respective resonant cavities, so as to adjust resonant frequency and gain curve, and make the two resonant inductors be consistent in two circuits, and then achieve the purpose of power sharing, as shown in fig. 3, the two current sharing inductors Lb are respectively connected in series into resonant networks of the two LLC resonant converter units, currents of two LLC circuits respectively flow in from a same-name end and a different-name end of the current sharing inductor Lb, when i1 is i2, magnetic potential of the inductor is equal to zero, no adjusting effect is generated on resonant inductance of respective circuits, when i1 is not equal to i2, magnetic potential is not equal to zero, the inductor generates inductance in respective circuits, the total resonant inductance of the respective resonant cavities is adjusted.
Referring to fig. 4, which is a working schematic diagram of mutual inductance current sharing inductors, a current sharing inductor Lb of a resonant network of an LLC resonant converter unit is equivalent to an equivalent circuit of inductance and mutual inductance of respective windings.
For the loop of current i1, its inductance value is Lb1＝Lr·(1-k·α),
For the loop of current i2, its inductance value is Lb2＝Lr·(1-k/α)，
Where k is the mutual inductance and α is a factor of i1 and i2, i.e., the mutual inductance M-k · Lr, i 2- α · i 1.
In the first LLC resonant converter unit, the total resonant inductance L1＝Ls1+Lb1；
In the second LLC resonant converter unit, the total resonant inductance L2＝Ls2+Lb2；
For simplicity of analysis, the resonance parameter Cs1 ≠ Cs2, the other resonance parameters are the same, and Cs1 ═ z · Cs2, then the resonance frequency satisfies the formula:
to make the resonant frequencies the same, L1＝z·L2To obtain the equation:
Ls1+Lr·(1-k·α)＝Ls2+Lr·(1-k/α)，
in the equation, Ls1＝Ls2Solving the equation to obtain Lr/b:
for the resonant capacitor CS, the capacitance with 10% error and 5% error is very common, and for the current sharing inductance, both windings are wound on the same magnetic core, the mutual inductance is not less than 0.9, so z is 0.9, k is 0.95, as shown in fig. 5, a graph of resonant cavity parameters α and b in an embodiment is shown, when b is 0.3, α is 1.2, b is 0.5, α is 1.1, that is, when b is 0.3-0.5, i1 and i2 differ by 10% -20%, L can satisfy the requirement of the power sharing, L is an equivalent to L, and L is a product of the resonant capacitor CS, the capacitance with 10% error and 5% errors1≠Ls2In time, the parameter calculation process is the same and will not be described repeatedly.
In an embodiment, the bidirectional multi-path parallel full-bridge LLC resonant converter includes N LLC resonant converter modules, N is a natural number greater than 1, two input ends of each LLC resonant converter module are respectively connected with two input ends of the full-bridge LLC resonant converter, and two output ends of each LLC resonant converter module are respectively connected with two output ends of the full-bridge LLC resonant converter.
The bidirectional multipath parallel full-bridge LLC resonant converter comprises an LLC resonant converter module, wherein the LLC resonant converter module consists of two LLC resonant converter units connected in parallel, and each LLC resonant converter unit comprises a switch network, a resonant network and a rectifying network which are sequentially connected; the resonant network is an LLC resonant cavity and comprises a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm and a current sharing inductor Lb which are connected in series. The current-sharing inductor Lb uses a magnetic core of a closed loop, does not generate magnetic interference on surrounding elements or eddy current loss in a high-permeability material, has the same number of winding turns, and flows into the inductor from a homonymous end and a heteronymous end respectively by i1 and i 2; the working frequencies of the two LLC resonant converter units are the same; the working frequency difference of the two LLC resonant converter units is 90, and the two LLC resonant converter units adopt a single-input and single-output mode, namely, two paths of inputs share one group of input capacitors, two paths of outputs share one group of output capacitors, and no other capacitors are respectively connected; wherein, the error of the electrical parameters of the resonant cavity parameters Cs and Ls of the two LLC resonant converter units is not more than +/-10%; because the current sharing inductors Lb of the two LLC resonant converter units are mutually inductive, the two LLC units realize automatic current sharing under the condition of not increasing any control strategy, and the method is simple and reliable in operation.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A bidirectional multipath parallel full-bridge LLC resonant converter is characterized by comprising an LLC resonant converter module;
the LLC resonant converter module comprises two LLC resonant converter units connected in parallel;
each LLC resonant converter unit comprises two input terminals; one input end of one LLC resonant converter unit is connected with one input end of another LLC resonant converter unit and used as one input end of the LLC resonant converter module; the other input terminal of the one LLC resonant converter unit is connected with the other input terminal of the other LLC resonant converter unit as the other input terminal of the LLC resonant converter module; two input ends of the LLC resonant converter module are used as two input ends of the full-bridge LLC resonant converter and are used for being connected to two ends of a power supply;
each LLC resonant converter unit comprises two output ends, one output end of one LLC resonant converter unit is connected with one output end of the other LLC resonant converter unit and is used as one output end of the LLC resonant converter module; another output terminal of the one LLC resonant converter unit is connected to another output terminal of the another LLC resonant converter unit as another output terminal of the LLC resonant converter module; two output ends of the LLC resonant converter module are used as two output ends of the full-bridge LLC resonant converter and are used for being connected to two ends of a load;
each LLC resonant converter unit comprises a switch network, a resonant network and a rectifying network which are connected in sequence;
the switching network comprises two parallel bridge arms, and two ends of each bridge arm are respectively used as two input ends of the LLC resonant converter unit; one bridge arm comprises a first switching tube Q1 and a second switching tube Q2 which are connected in series, and the other bridge arm comprises a third switching tube Q3 and a fourth switching tube Q4 which are connected in series;
the resonant network is an LLC resonant cavity and comprises a resonant capacitor Cs, a resonant inductor Ls, a transformer excitation inductor Lm and a current sharing inductor Lb which are connected in series; one end of the resonant network is connected to a bridge arm between the first switching tube Q1 and the second switching tube Q2, and the other end of the resonant network is connected to a bridge arm between the third switching tube Q3 and the fourth switching tube Q4;
the rectifier network comprises a first transformer T1 and a rectifier bridge circuit;
two ends of a primary side of the first transformer T1 are connected in parallel to two ends of the transformer excitation inductor L;
two ends of the secondary side of the first transformer T1 are connected with two input ends of the rectifier bridge circuit;
two output ends of the rectifier bridge circuit are respectively used as two output ends of the LLC resonant converter unit;
and the current sharing inductors Lb of the two LLC resonant converter units are mutually mutual inductance.
2. The converter according to claim 1, wherein the LLC resonant converter module further comprises a second transformer T2, the primary side and the secondary side of the second transformer T2 being current sharing inductors Lb of the two LLC resonant converter units, respectively.
3. A converter according to claim 2, wherein the connection directions of the current sharing inductances Lb of the two LLC resonant converter units are opposite.
4. The converter according to claim 1, wherein the LLC resonant converter module further comprises a load capacitor connected in parallel between two output terminals of the full-bridge LLC resonant converter.
5. The converter according to claim 1, wherein the resonant network is connected in series in the order of resonant capacitor Cs, resonant inductor Ls, transformer magnetizing inductor Lm and current sharing inductor Lb.
6. The converter according to claim 1, wherein the resonant network is connected in series in the order of a current sharing inductance Lb, a resonant capacitance Cs, a resonant inductance Ls, and a transformer magnetizing inductance Lm.
7. The converter according to claim 1, wherein the resonant network is connected in series in the order of resonant capacitor Cs, current sharing inductor Lb, resonant inductor Ls, and transformer magnetizing inductor Lm.
8. The converter according to claim 1, wherein the resonant network is connected in series in the order of resonant capacitor Cs, resonant inductor Ls, current sharing inductor Lb and transformer magnetizing inductor Lm.
9. The converter according to claim 1, wherein the resonant network is connected in series in the order of a current sharing inductance Lb, a resonant inductance Ls, a transformer excitation inductance Lm and a resonant capacitance Cs;
or the resonance network is sequentially connected in series with a resonance inductor Ls, a current sharing inductor Lb, a transformer excitation inductor Lm and a resonance capacitor Cs;
or the resonance network is sequentially connected in series with a resonance inductor Ls, a transformer excitation inductor Lm, a current sharing inductor Lb and a resonance capacitor Cs;
or the resonance network is sequentially connected in series with a resonance inductor Ls, a transformer excitation inductor Lm, a resonance capacitor Cs and a current sharing inductor Lb.
10. A converter according to claim 1, comprising N of said LLC resonant converter modules, N being a natural number greater than 1; two input ends of each LLC resonant converter module are respectively connected with two input ends of the full-bridge LLC resonant converter; and two output ends of each LLC resonant converter module are respectively connected with two output ends of the full-bridge LLC resonant converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921663194.8U CN210380663U (en) | 2019-09-30 | 2019-09-30 | Bidirectional multipath parallel full-bridge LLC resonant converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112350299A (en) * | 2020-10-23 | 2021-02-09 | 苏州浪潮智能科技有限公司 | Electronic equipment and power supply unit thereof |
| CN113556040A (en) * | 2021-07-29 | 2021-10-26 | 石家庄通合电子科技股份有限公司 | Multichannel LLC resonant transformation ware, resonant transformation ware circuit and fill electric pile |
| CN113612383A (en) * | 2021-06-23 | 2021-11-05 | 苏州浪潮智能科技有限公司 | Efficient switch resonant voltage converter |
| CN114825962A (en) * | 2022-04-28 | 2022-07-29 | 广东首航智慧新能源科技有限公司 | Multi-channel resonant circuit and resonant converter |
| CN114928253A (en) * | 2022-07-19 | 2022-08-19 | 广东首航智慧新能源科技有限公司 | Current-sharing control method, resonance conversion circuit and power module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112350299A (en) * | 2020-10-23 | 2021-02-09 | 苏州浪潮智能科技有限公司 | Electronic equipment and power supply unit thereof |
| WO2022083205A1 (en) * | 2020-10-23 | 2022-04-28 | 苏州浪潮智能科技有限公司 | Electronic device and power supply unit therefor |
| CN113612383A (en) * | 2021-06-23 | 2021-11-05 | 苏州浪潮智能科技有限公司 | Efficient switch resonant voltage converter |
| CN113556040A (en) * | 2021-07-29 | 2021-10-26 | 石家庄通合电子科技股份有限公司 | Multichannel LLC resonant transformation ware, resonant transformation ware circuit and fill electric pile |
| CN114825962A (en) * | 2022-04-28 | 2022-07-29 | 广东首航智慧新能源科技有限公司 | Multi-channel resonant circuit and resonant converter |
| CN114928253A (en) * | 2022-07-19 | 2022-08-19 | 广东首航智慧新能源科技有限公司 | Current-sharing control method, resonance conversion circuit and power module |
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