CN218997940U - DCDC circuit and current balancing system of multiple transformers - Google Patents

DCDC circuit and current balancing system of multiple transformers Download PDF

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CN218997940U
CN218997940U CN202223398913.2U CN202223398913U CN218997940U CN 218997940 U CN218997940 U CN 218997940U CN 202223398913 U CN202223398913 U CN 202223398913U CN 218997940 U CN218997940 U CN 218997940U
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switching tube
circuit
transformer
diode
llc
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言超
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Shanghai Anshibo Energy Technology Co ltd
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Shanghai Anshibo Energy Technology Co ltd
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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
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Abstract

The application discloses a DCDC circuit and current balancing system of a multi-transformer, and relates to the technical field of electronic power. The circuit comprises two LLC circuits, wherein each LLC circuit comprises a primary side circuit, a secondary side circuit and m transformers; each transformer comprises two primary windings and one secondary winding; the first primary winding of the ith transformer of the first LLC circuit is connected with the first primary winding of the ith transformer of the second LLC circuit in series and then connected to the corresponding primary circuit, and the second primary winding of the ith transformer of the first LLC circuit is connected with the second primary winding of the ith transformer of the second LLC circuit in series and then connected to the corresponding primary circuit; the secondary windings of each transformer are connected to a corresponding secondary circuit. The power balancing method and the power balancing device naturally achieve power balancing between the two power units, namely natural current sharing, simplify a control scheme and improve reliability of a circuit.

Description

DCDC circuit and current balancing system of multiple transformers
Technical Field
The application relates to the technical field of electronic power, in particular to a DCDC circuit of a multi-transformer and a current balancing system.
Background
In recent years, electric automobiles have a good prospect because of their smaller environmental impact than conventional automobiles. Because the electric automobile uses the vehicle-mounted power supply as power and the energy storage of the storage battery per unit weight is less, consumers need to charge frequently so as to ensure that the electric automobile can be used normally. However, the current charging technology gradually cannot meet the requirement of consumers on the charging speed of the electric automobile.
Faster charging speeds mean higher charging power, and so the market is also demanding higher and higher power for the charging modules in the charging peg. In the existing circuit design, a serial-parallel structure of a circuit topology is commonly used to meet the requirement of higher power. For example, fig. 1A shows a parallel topology structure of a conventional two-way LLC full-bridge circuit, and since there is a certain tolerance in LLC parameters such as an inductor and a resonant capacitor, in order to realize current sharing under the working condition of the two-way LLC circuit, it is necessary to independently detect respective output currents of the two-way LLC, so as to independently control switching frequencies of the two-way LLC. However, the switching frequencies of the two LLC in this manner may not be identical.
For another example, fig. 1B shows a topology structure in which two conventional LLC primary sides are connected in series and secondary sides are connected in parallel, and two LLC full-bridge circuits are controlled to operate at the same frequency by means of coupling of the primary sides in series. However, since two LLC circuits may have differences in resonance parameters, only a substantial balancing of the power, i.e. a substantial balancing of the current, of the two LLC full bridge circuits can be achieved.
Disclosure of Invention
In order to solve at least one of the problems in the prior art, the present application provides a DCDC circuit of a multi-transformer, comprising two LLC circuits, each LLC circuit comprising a primary side circuit, a secondary side circuit, and m transformers;
each transformer comprises two primary windings and a secondary winding arranged between the two primary windings;
the two-way LLC circuit comprises a first LLC circuit and a second LLC circuit, wherein a first primary winding of an ith transformer of the first LLC circuit and a first primary winding of an ith transformer of the second LLC circuit are connected in series and then connected to the corresponding primary circuit, and a second primary winding of the ith transformer of the first LLC circuit and a second primary winding of the ith transformer of the second LLC circuit are connected in series and then connected to the corresponding primary circuit; the secondary windings of each transformer are connected to the corresponding secondary circuit; i is more than or equal to 1 and less than or equal to m, and both i and m are positive integers.
In one embodiment, the primary side circuit comprises a full bridge circuit, and m takes on a value of 1;
the primary circuit of the first LLC circuit comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected in series and then connected in parallel; the primary side circuit of the second LLC circuit comprises a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, wherein the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube are respectively connected in series and then connected in parallel;
The first primary winding of the transformer of the first LLC circuit is connected in series with a group of resonance capacitors and resonance inductors and then is connected between a first switching tube and a second switching tube; a first primary winding of a transformer of the second LLC circuit is connected between the third switching tube and the fourth switching tube;
the second primary winding of the transformer of the first LLC circuit is connected between the seventh switching tube and the eighth switching tube, and the second primary winding of the transformer of the second LLC circuit is connected between the fifth switching tube and the sixth switching tube after being connected with a set of resonance capacitor and resonance inductor in series.
In one embodiment, the secondary side circuit includes a full wave rectifying circuit;
the secondary side circuit of the first LLC circuit comprises a first diode, a second diode, a third diode and a fourth diode, wherein the first diode, the second diode, the third diode and the fourth diode are respectively connected in series and then connected in parallel; the secondary side circuit of the second LLC circuit comprises a fifth diode, a sixth diode, a seventh diode and an eighth diode, wherein the fifth diode, the sixth diode, the seventh diode and the eighth diode are respectively connected in series and then connected in parallel;
One end of a secondary winding of a transformer of the first LLC circuit is connected between the first diode and the second diode, and the other end of the secondary winding is connected between the third diode and the fourth diode;
one end of a secondary winding of the transformer of the second LLC circuit is connected between the fifth diode and the sixth diode, and the other end is connected between the seventh diode and the eighth diode.
In one embodiment, the secondary side circuit includes a synchronous rectification circuit;
the secondary side circuit of the first LLC circuit comprises a ninth switching tube, a tenth switching tube, an eleventh switching tube and a twelfth switching tube, wherein the ninth switching tube, the tenth switching tube, the eleventh switching tube and the twelfth switching tube are respectively connected in series and then connected in parallel; the secondary side circuit of the second LLC circuit comprises a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube and a sixteenth switching tube, and the thirteenth switching tube, the fourteenth switching tube, the fifteenth switching tube and the sixteenth switching tube are respectively connected in series and then connected in parallel;
one end of a secondary winding of the transformer of the first LLC circuit is connected between the ninth switching tube and the tenth switching tube, and the other end of the secondary winding of the transformer of the first LLC circuit is connected between the eleventh switching tube and the twelfth switching tube;
One end of a secondary winding of the transformer of the second LLC circuit is connected between the thirteenth switching tube and the fourteenth switching tube, and the other end of the secondary winding of the transformer of the second LLC circuit is connected between the fifteenth switching tube and the sixteenth switching tube.
In one embodiment, the primary side circuit comprises a three-phase bridge circuit, and m takes on a value of 3;
the primary circuit of the first LLC circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube, wherein the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are respectively connected in series and then connected in parallel; the primary side circuit of the second LLC circuit comprises a seventh switching tube, an eighth switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube and a twelfth switching tube, wherein the seventh switching tube, the eighth switching tube, the ninth switching tube, the tenth switching tube, the eleventh switching tube and the twelfth switching tube are respectively connected in series and then connected in parallel;
the second primary winding of the first transformer of the first LLC circuit is connected between the first switching tube and the second switching tube, and the first primary winding of the first transformer of the second LLC circuit is connected between the seventh switching tube and the eighth switching tube; the first primary winding of the first transformer of the first LLC circuit is connected with one group of resonance capacitor and resonance inductor in series and then connected with the second primary winding of the first transformer of the second LLC circuit through the other group of resonance capacitor and resonance inductor;
A second primary winding of a second transformer of the first LLC circuit is connected between the third switching tube and the fourth switching tube, and the first primary winding of the second transformer of the second LLC circuit is connected between the ninth switching tube and the tenth switching tube; the first primary winding of the second transformer of the first LLC circuit is connected with one group of resonance capacitor and resonance inductor in series and then connected with the second primary winding of the second transformer of the second LLC circuit through the other group of resonance capacitor and resonance inductor;
a second primary winding of a third transformer of the first LLC circuit is connected between the fifth switching tube and the sixth switching tube, and the first primary winding of the third transformer of the second LLC circuit is connected between the eleventh switching tube and the twelfth switching tube; the first primary winding of the third transformer of the first LLC circuit is connected with one group of resonance capacitor and resonance inductor in series, and then is connected with the second primary winding of the third transformer of the second LLC circuit through the other group of resonance capacitor and resonance inductor.
In one embodiment, the secondary side circuit includes a full wave rectifying circuit;
The secondary side circuit of the first LLC circuit comprises a first diode, a second diode, a third diode, a fourth diode, a fifth diode and a sixth diode, wherein the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode are respectively connected in series and then connected in parallel; the secondary side circuit of the second LLC circuit comprises a seventh diode, an eighth diode, a ninth diode, a twelfth diode, an eleventh diode and a twelfth diode, wherein the seventh diode and the eighth diode, the ninth diode and the twelfth diode, the eleventh diode and the twelfth diode are respectively connected in series and then connected in parallel;
the first end of the secondary winding of the first transformer of the first LLC circuit is connected between the first diode and the second diode, the first end of the secondary winding of the second transformer of the first LLC circuit is connected between the third diode and the fourth diode, the first end of the secondary winding of the third transformer of the first LLC circuit is connected between the fifth diode and the sixth diode, and the second end of the secondary winding of the first transformer of the first LLC circuit, the second end of the secondary winding of the second transformer of the first LLC circuit and the second end of the secondary winding of the third transformer of the first LLC circuit are connected;
The first end of the secondary winding of the first transformer of the second LLC circuit is connected between the seventh diode and the eighth diode, the first end of the secondary winding of the second transformer of the second LLC circuit is connected between the ninth diode and the twelfth diode, the first end of the secondary winding of the third transformer of the second LLC circuit is connected between the eleventh diode and the twelfth diode, and the second end of the secondary winding of the first transformer of the second LLC circuit, the second end of the secondary winding of the second transformer of the second LLC circuit and the second end of the secondary winding of the third transformer of the second LLC circuit are connected.
In one embodiment, the secondary side circuit includes a synchronous rectification circuit;
the secondary side circuit of the first LLC circuit comprises a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube and an eighteenth switching tube, wherein the thirteenth switching tube and the fourteenth switching tube, the fifteenth switching tube and the sixteenth switching tube, the seventeenth switching tube and the eighteenth switching tube are respectively connected in series and then connected in parallel; the secondary side circuit of the second LLC circuit comprises a nineteenth switching tube, a twenty-first switching tube, a twenty-second switching tube, a twenty-third switching tube and a twenty-fourth switching tube, wherein the nineteenth switching tube, the twenty-first switching tube, the twenty-second switching tube, the twenty-third switching tube and the twenty-fourth switching tube are respectively connected in series and then connected in parallel;
The first end of the secondary winding of the first transformer of the first LLC circuit is connected between a thirteenth switching tube and a fourteenth switching tube, the first end of the secondary winding of the second transformer of the first LLC circuit is connected between a fifteenth switching tube and a sixteenth switching tube, the first end of the secondary winding of the third transformer of the first LLC circuit is connected between a seventeenth switching tube and an eighteenth switching tube, and the second end of the secondary winding of the first transformer of the first LLC circuit, the second end of the secondary winding of the second transformer of the first LLC circuit and the second end of the secondary winding of the third transformer of the first LLC circuit are connected;
the first end of the secondary winding of the first transformer of the second LLC circuit is connected between the nineteenth switching tube and the twentieth switching tube, the first end of the secondary winding of the second transformer of the second LLC circuit is connected between the twenty first switching tube and the twenty second switching tube, the first end of the secondary winding of the third transformer of the second LLC circuit is connected between the twenty third switching tube and the twenty fourth switching tube, and the second end of the secondary winding of the first transformer of the second LLC circuit, the second end of the secondary winding of the second transformer of the second LLC circuit and the second end of the secondary winding of the third transformer of the second LLC circuit are connected.
In an embodiment, any one resonant inductor in the DCDC circuit of the multi-transformer is integrated in the leakage inductance of the transformer corresponding to the resonant inductor.
In an embodiment, the primary side circuit of the first LLC circuit is connected in parallel with the primary side circuit of the second LLC circuit.
In an embodiment, the primary side circuit of the first LLC circuit is connected in series with the primary side circuit of the second LLC circuit.
In an embodiment, the present application also provides a current balancing system employing any of the multi-transformer DCDC circuits provided herein.
According to the DCDC circuit and the current balancing system of the multi-transformer, on the premise of realizing the function of power parallel connection, through a very simple synchronous control technology, the power balancing between two power units, namely the natural current sharing, is naturally realized, so that the control scheme is simplified, and the reliability of the circuit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
Fig. 1A and 1B are prior art LLC circuit topologies.
Fig. 2A and fig. 2B are schematic structural diagrams of the transformer provided in the present application.
Fig. 3A and 3B are connection relations between primary windings and secondary windings of each transformer provided in the present application.
Fig. 4A is a schematic diagram of a primary circuit and a connection relationship between the primary circuit and a transformer provided in the present application.
Fig. 4B is a schematic diagram of driving pulses of each switching tube in the primary side circuit shown in fig. 4A.
Fig. 4C is a schematic diagram of the secondary circuit and the connection relationship between the secondary circuit and the transformer provided in the present application.
Fig. 4D is another schematic diagram of the secondary circuit and the connection relationship between the secondary circuit and the transformer provided in the present application.
Fig. 5A is another schematic diagram of the primary circuit and the connection relationship between the primary circuit and the transformer provided in the present application.
Fig. 5B is a schematic diagram of driving pulses of each switching tube in the primary side circuit shown in fig. 5A.
Fig. 5C is another schematic diagram of the secondary circuit and the connection relationship between the secondary circuit and the transformer provided in the present application.
Fig. 5D is another schematic diagram of the secondary circuit and the connection relationship between the secondary circuit and the transformer provided in the present application.
Fig. 6A is a circuit topology diagram of the integrated circuit of fig. 4C.
Fig. 6B is a circuit topology diagram of the integrated circuit of fig. 4D after leakage inductance integration.
Fig. 6C is a circuit topology diagram of the integrated circuit of fig. 5C after leakage inductance integration.
Fig. 6D is a circuit topology diagram of the integrated circuit of fig. 5D after leakage inductance.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings. The illustrative embodiments of the present application and their description are presented herein to illustrate the application and not to limit the application.
It should be noted that the DCDC circuit of the multi-transformer of the present application may be used in the technical field of electronic power, and may also be used in any field other than the technical field of electronic power.
The application provides a DCDC circuit of a multi-transformer, which comprises two LLC circuits, wherein each LLC circuit comprises a primary side circuit, a secondary side circuit and m transformers;
in particular, the structure of the transformers can be seen in fig. 2A to 2B, each transformer comprising a primary winding P 1 Primary winding P 2 And secondary winding S 1 Wherein the secondary winding S 1 Arranged on the primary winding P 1 And primary winding P 2 Fig. 2A is a schematic cross-sectional view of a transformer, the primary winding P 1 Secondary winding S 1 And primary winding P 2 Sequentially wound on the framework F from left to right. One of the characteristics of the transformers shown in fig. 2A and 2B is that the two primary windings of the transformer are far apart, and the coupling coefficient between the two primary windings is relatively low, and is generally not higher than 0.95, that is, the coupling coefficient of the two primary windings of the transformer adopted in the application is less than or equal to 0.95. The definition of the coupling coefficient is given here as follows:
Figure BDA0004004215210000071
where k is the primary winding P 1 And primary winding P 2 Coupling coefficient between L sc When the primary winding P 2 Primary winding P measured at short circuit 1 Side leakage inductance, L open When the primary winding P 2 Primary winding P measured at open circuit 1 Side inductance.
The primary winding and the secondary winding of each transformer in the two LLC circuits are connected in the following manner: the first primary winding of the ith transformer of the first LLC circuit is connected with the first primary winding of the ith transformer of the second LLC circuit in series and then connected to the corresponding primary circuit, and the second primary winding of the ith transformer of the first LLC circuit is connected with the second primary winding of the ith transformer of the second LLC circuit in series and then connected to the corresponding primary circuit; the secondary windings of each transformer are connected to the corresponding secondary circuit; i is more than or equal to 1 and less than or equal to m, and both i and m are positive integers. The number of transformers m in each LLC circuit can take the values of 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, etc. greater than or equal to 1, which is given by way of example only and not limitation.
For example, FIG. 3A is a connection relationship assuming that each LLC circuit includes a transformer, wherein the first LLC circuit includes a transformer T 11 In a second LLC circuitComprising a transformer T 21 The method comprises the steps of carrying out a first treatment on the surface of the FIG. 3B shows a connection relationship when three transformers are included in each LLC circuit, wherein the first LLC circuit includes three transformers, namely, a transformer T 11 Transformer T 12 And a transformer T 13 The second LLC circuit comprises three transformers, namely a transformer T 21 Transformer T 22 And a transformer T 23 。
The connection mode of the primary side circuit in the two LLC circuits can be as follows: the primary side circuit of the first LLC circuit is connected in parallel with the primary side circuit of the second LLC circuit, or the primary side circuit of the first LLC circuit is connected in series with the DC input of the primary side circuit of the second LLC circuit. When the parallel connection mode of the primary side circuits is adopted, the input voltage of the primary side circuits can reach 650V-800V, but the current of each primary side circuit can be reduced by half compared with the direct current input series connection mode of the primary side circuits, so that electronic components in the LLC circuit can be protected conveniently, damage to the electronic components caused by overcurrent is avoided, and relatively high efficiency is realized. But no matter the primary side circuit is connected in parallel or the direct current input of the primary side circuit is connected in series, the method can be applied to the application, and the natural current sharing and synchronous control of the two LLC circuits are realized.
The connection mode of the secondary side circuit in the two LLC circuits can be kept consistent with the connection mode of the primary side circuit, namely when the primary side circuits of the two LLC circuits are connected in parallel, the direct current outputs of the secondary side circuits of the two LLC circuits are connected in parallel; when the direct current inputs of the primary side circuits of the two LLC circuits are connected in series, the direct current outputs of the secondary side circuits of the two LLC circuits are connected in series.
The connection relationship between the transformer in the LLC circuit and the primary and secondary circuits is different depending on the types of the primary and secondary circuits, and the circuit characteristics of the primary and secondary circuits need to be satisfied. The present application will provide several specific examples, and in the following examples, a connection mode in which primary side circuits and secondary side circuits of two LLC circuits are connected in parallel is taken as an example, and the present application is not limited thereto. Meanwhile, for convenience of description, the primary side circuit of the first LLC circuit is collectively defined herein as a 1 The secondary side circuit is B 1 The transformers are in turn denoted as T 11 、T 12 、T 13 ……T 1m The primary side circuit of the second LLC circuit is A 2 The secondary side circuit is B 2 The transformers are in turn denoted as T 21 、T 22 、T 23 ……T 2m Where m is the number of transformers contained in each LLC circuit, and is a positive integer. The above definition applies to all examples below.
Example one: the primary side circuit includes a full bridge circuit.
In this case, in order to meet the circuit characteristics of the full bridge circuit, each LLC circuit needs to include a transformer, i.e., m takes a value of 1.
FIG. 4A shows a circuit topology of a parallel connection of two full-bridge LLC circuits, in which the primary side circuit A 1 Comprises three parallel circuits, wherein a capacitor C is arranged on a first parallel circuit 1 The second parallel circuit comprises a first switch tube Q connected in series 1 And a second switching tube Q 2 The third parallel circuit comprises a third switching tube Q connected in series 3 And a fourth switching tube Q 4 The method comprises the steps of carrying out a first treatment on the surface of the Primary side circuit A 2 With primary side circuit A 1 The structure is similar, and the three parallel circuits are also included, and the first parallel circuit includes a capacitor C 2 The second parallel circuit comprises a fifth switch tube Q connected in series 5 And a sixth switching tube Q 6 The third parallel circuit comprises a seventh switching tube Q connected in series 7 And an eighth switching tube Q 8 。
Transformer T 11 Is a first primary winding P 111 Is connected with the transformer T 21 Is a first primary winding P 211 One end of (C) is connected in series, and the other end is connected with a group of resonant capacitors C 11 And resonant inductance L 11 Is connected in series to a first switch tube Q 1 And a second switching tube Q 2 Between, the transformer T 21 Is a first primary winding P 211 Is connected to the third switching tube Q 3 And a fourth switching tube Q 4 Between them.
Similarly, transformer T 11 Is a second primary winding P 112 Is connected with the transformer T 21 Is a second primary winding P 212 One end of (B) is connected in series, the other end is connected to a seventh switch tube Q 7 And an eighth switching tube Q 8 Between, the transformer T 21 Is a second primary winding P 212 And a set of resonant capacitors C 21 And resonant inductance L 21 Is connected in series to a fifth switching tube Q 5 And a sixth switching tube Q 6 Between them.
Fig. 4B is a schematic diagram of driving pulses of each switching tube in the primary side circuit shown in fig. 4A. As can be seen from fig. 4B, the first switching tube Q 1 Fourth switching tube Q 4 Sixth switching tube Q 6 Seventh switch tube Q 7 Simultaneously conducting, second switch tube Q 2 Third switch tube Q 3 Fifth switch tube Q 5 Eighth switching tube Q 8 While conducting.
The transformer with two primary windings is coupled in series between the upper full bridge and the lower full bridge, so that natural two-way full bridge LLC current sharing can be realized, and the two full bridge circuits have consistent control frequency; in the normal working state (excluding the special state such as the starting state), the first switch tube Q 1 Fourth switching tube Q 4 Sixth switching tube Q 6 Seventh switch tube Q 7 Control signal of the second switch tube Q 2 Third switch tube Q 3 Fifth switch tube Q 5 Eighth switching tube Q 8 Meanwhile, the two control signals are complemented with a certain dead time (the dead time is preset), so that a control circuit and a control algorithm are greatly simplified, and beat frequency (namely, a frequency difference value between two circuits and time variation possibly) caused by an asynchronous control mode of the circuit topology shown in fig. 1A is avoided, so that output ripple current and ripple voltage are avoided.
When the primary side circuit is shown in example one, the secondary side circuit can be seen in examples two and three.
Example two: the secondary side circuit comprises a full-wave rectifying circuit consisting of diodes.
As shown in fig. 4C, the secondary side circuit B 1 Comprises three parallel circuits, wherein a capacitor C is arranged on a first parallel circuit 3 First, theThe two parallel circuits comprise a first diode D connected in series 1 And a second diode D 2 The third parallel circuit comprises a third diode D connected in series 3 And a fourth diode D 4 The method comprises the steps of carrying out a first treatment on the surface of the Secondary side circuit B 2 And secondary side circuit B 1 The structure is similar, and the three parallel circuits are also included, and the first parallel circuit includes a capacitor C 4 The second parallel circuit comprises a fifth diode D connected in series 5 And a sixth diode D 6 The third parallel circuit comprises a seventh diode D connected in series 7 And an eighth diode D 8 。
Transformer T 11 Is a secondary winding S 11 Is connected to the first diode D 1 And a second diode D 2 Between, the other end is connected to the third diode D 3 And a fourth diode D 4 Between them;
similarly, transformer T 21 Is a secondary winding S 21 Is connected to the fifth diode D 5 And a sixth diode D 6 Between, the other end is connected to the seventh diode D 7 And an eighth diode D 8 Between them.
Example three: the secondary side circuit comprises a synchronous rectification circuit formed by switching tubes.
As shown in fig. 4D, the secondary side circuit B 1 Comprises three parallel circuits, wherein a capacitor C is arranged on a first parallel circuit 3 The second parallel circuit comprises a ninth switch tube Q connected in series 9 And a tenth switching tube Q 10 The third parallel circuit comprises an eleventh switch tube Q connected in series 11 And a twelfth switching tube Q 12 The method comprises the steps of carrying out a first treatment on the surface of the Secondary side circuit B 2 And secondary side circuit B 1 The structure is similar, and the three parallel circuits are also included, and the first parallel circuit includes a capacitor C 4 The second parallel circuit comprises a thirteenth switching tube Q connected in series 13 And a fourteenth switching tube Q 14 The third parallel circuit comprises a fifteenth switching tube Q connected in series 15 And a sixteenth switching tube Q 16 。
Transformer T 11 Is a secondary winding S 11 One of (2)The end is connected to a ninth switching tube Q 9 And a tenth switching tube Q 10 Between, the other end is connected to the eleventh switch tube Q 11 And a twelfth switching tube Q 12 Between them;
similarly, transformer T 21 Is a secondary winding S 21 Is connected to the thirteenth switching tube Q 13 And a fourteenth switching tube Q 14 Between, the other end is connected to the fifteenth switching tube Q 15 And a sixteenth switching tube Q 16 Between them.
Example four: the primary side circuit includes a three-phase bridge circuit.
At this time, to meet the circuit characteristics of the three-phase bridge circuit, each LLC circuit needs to include three transformers, i.e. m takes on a value of 3, and the first LLC circuit includes a transformer T 11 Transformer T 12 And a transformer T 13 The second LLC circuit comprises a transformer T 21 Transformer T 22 And a transformer T 23 。
FIG. 5A shows a circuit topology of a parallel connection of two-way three-bridge LLC circuits, in which the primary side circuit A 1 Comprises four parallel circuits, a first parallel circuit comprises a capacitor C 1 The second parallel circuit comprises a first switch tube Q connected in series 1 And a second switching tube Q 2 The third parallel circuit comprises a third switching tube Q connected in series 3 And a fourth switching tube Q 4 The fourth parallel circuit comprises a fifth switch tube Q connected in series 5 And a sixth switching tube Q 6 The method comprises the steps of carrying out a first treatment on the surface of the Primary side circuit A 2 With primary side circuit A 1 Similar in structure, also includes four parallel circuits, the first parallel circuit includes a capacitor C 2 The second parallel circuit comprises a seventh switching tube Q connected in series 7 And an eighth switching tube Q 8 The third parallel circuit comprises a ninth switch tube Q connected in series 9 And a tenth switching tube Q 10 The fourth parallel circuit comprises an eleventh switch tube Q connected in series 11 And a twelfth switching tube Q 12 。
Transformer T 11 Is a second primary winding P 112 Is connected to the first switching tube Q 1 And a second switchTube Q 2 Between the other end and the transformer T 21 Is a second primary winding P 212 Is connected with one end of the primary winding P 212 And a set of resonant capacitors C 21 And resonant inductance L 21 After being connected in series, the two nodes are connected to a common node; transformer T 21 Is a first primary winding P 211 Is connected to the seventh switching tube Q 7 And an eighth switching tube Q 8 On the other end and the transformer T 11 Is a first primary winding P 111 Is connected with one end of the primary winding P 111 And a set of resonant capacitors C 11 And resonant inductance L 11 Connected in series to a common node for connection with the primary winding P 212 Is communicated with the communication network.
Similarly, transformer T 12 Is a second primary winding P 122 Is connected to the first switching tube Q 3 And a fourth switching tube Q 4 Between the other end and the transformer T 22 Is a second primary winding P 222 Is connected with one end of the primary winding P 222 And a set of resonant capacitors C 22 And resonant inductance L 22 After being connected in series, the two nodes are connected to a common node; transformer T 22 Is a first primary winding P 221 Is connected to the ninth switching tube Q 9 And a tenth switching tube Q 10 On the other end and the transformer T 12 Is a first primary winding P 121 Is connected with one end of the primary winding P 121 And a set of resonant capacitors C 12 And resonant inductance L 12 Connected in series to a common node for connection with the primary winding P 222 Is communicated with the communication network.
Transformer T 13 Is a second primary winding P 132 Is connected to the fifth switching tube Q 5 And a sixth switching tube Q 6 Between the other end and the transformer T 232 Is a second primary winding P 232 Is connected with one end of the primary winding P 232 And a set of resonant capacitors C 23 And resonant inductance L 23 After being connected in series, the two nodes are connected to a common node; transformer T 23 Is a first primary winding P 221 Is connected to the eleventh switching tube Q 11 And a twelfth switching tube Q 12 On the other end and the transformer T 13 Is a first primary winding P 131 Is connected with one end of the primary winding P 131 And a set of resonant capacitors C 13 And resonant inductance L 13 Connected in series to a common node for connection with the primary winding P 232 Is communicated with the communication network.
Fig. 5B is a schematic diagram of driving pulses of each switching tube in the primary side circuit shown in fig. 5A. As can be seen from fig. 5B, the primary circuit can be controlled by three driving signals 120 ° out of phase. Wherein, in the primary circuit, a first switching tube Q 1 And an eighth switching tube Q 8 Simultaneously conducting, second switch tube Q 2 And a seventh switching tube Q 7 Simultaneously conducting, third switch tube Q 3 And a tenth switching tube Q 10 Simultaneously conducting, fourth switch tube Q 4 And a ninth switching tube Q 9 Simultaneously conducting, fifth switch tube Q 5 And a twelfth switching tube Q 12 Simultaneously conducting, sixth switch tube Q 6 And an eleventh switching tube Q 11 While conducting.
When the primary side circuit is shown as example four, the secondary side circuit can be seen from examples five and six.
Example five: the secondary side circuit comprises a full-wave rectifying circuit consisting of diodes.
As shown in fig. 5C, the secondary side circuit B 1 Comprises four parallel circuits, a first parallel circuit comprises a capacitor C 3 The second parallel circuit comprises a first diode D connected in series 1 And a second diode D 2 The third parallel circuit comprises a third diode D connected in series 3 And a fourth diode D 4 The fourth parallel circuit comprises a fifth diode D connected in series 5 And a sixth diode D 6 The method comprises the steps of carrying out a first treatment on the surface of the Secondary side circuit B 2 And secondary side circuit B 1 Similar in structure, also includes four parallel circuits, the first parallel circuit includes a capacitor C 4 The second parallel circuit comprises a seventh diode D connected in series 7 And an eighth diode D 8 The third parallel circuit comprises a ninth diode D connected in series 9 And tenth stepDiode D 10 The fourth parallel circuit comprises an eleventh diode D connected in series 11 And a twelfth diode D 12 。
Transformer T 11 Is a secondary winding S 11 Is connected to the first diode D 1 And a second diode D 2 The other end of the first common node is connected to the first common node; transformer T 12 Is a secondary winding S 12 Is connected to the third diode D 3 And a fourth diode D 4 The other end of the first common node is connected to the first common node; transformer T 13 Is a secondary winding S 13 Is connected to the fifth diode D 5 And a sixth diode D 6 The other end of the first common node is connected to the first common node; i.e. secondary winding S 11 Secondary winding S 12 And secondary winding S 13 One end of each of the two nodes is connected to the same common node to realize mutual communication.
Similarly, transformer T 21 Is a secondary winding S 21 Is connected to the seventh diode D 7 And an eighth diode D 8 The other end of the first common node is connected to the second common node; transformer T 22 Is a secondary winding S 22 Is connected to the ninth diode D 9 And a twelfth polar tube D 10 The other end of the first common node is connected to the second common node; transformer T 23 Is a secondary winding S 23 Is connected to the eleventh diode D 11 And a twelfth diode D 12 The other end of the first common node is connected to the second common node; i.e. secondary winding S 21 Secondary winding S 22 And secondary winding S 23 One end of each of the two nodes is connected to the same common node to realize mutual communication.
It is understood that the first common node and the second common node are different nodes.
Example six: the secondary side circuit comprises a synchronous rectification circuit formed by switching tubes;
as shown in fig. 5D, the secondary side circuit B 1 Comprises four parallel circuits, a first parallel circuit comprises a capacitor C 3 Second parallel circuitThe upper part of the circuit comprises a thirteenth switching tube Q connected in series 13 And a fourteenth switching tube Q 14 The third parallel circuit comprises a fifteenth switching tube Q connected in series 15 And a sixteenth switching tube Q 16 A seventeenth switch tube Q connected in series is arranged on the fourth parallel circuit 17 And an eighteenth switching tube Q 18 The method comprises the steps of carrying out a first treatment on the surface of the Secondary side circuit B 2 And secondary side circuit B 1 Similar in structure, also includes four parallel circuits, the first parallel circuit includes a capacitor C 4 The second parallel circuit comprises a nineteenth switch tube Q connected in series 19 And a twentieth switching tube Q 20 The third parallel circuit comprises a twenty-first switch tube Q connected in series 21 And a twenty-second switching tube Q 22 A fourth parallel circuit comprises a twenty-third switch tube Q connected in series 23 And a twenty-fourth switching tube Q 24 。
Transformer T 11 Is a secondary winding S 11 Is connected to the thirteenth switching tube Q 13 And a fourteenth switching tube Q 14 The other end of the first common node is connected to the first common node; transformer T 12 Is a secondary winding S 12 Is connected to the fifteenth switching tube Q 15 And a sixteenth switching tube Q 16 The other end of the first common node is connected to the first common node; transformer T 13 Is a secondary winding S 13 Is connected to the seventeenth switching tube Q 17 And an eighteenth switching tube Q 18 The other end of the first common node is connected to the first common node; i.e. secondary winding S 11 Secondary winding S 12 And secondary winding S 13 One end of each of the two nodes is connected to the same common node to realize mutual communication.
Similarly, transformer T 21 Is a secondary winding S 21 Is connected to the nineteenth switching tube Q 19 And a twentieth switching tube Q 20 The other end of the first common node is connected to the second common node; transformer T 22 Is a secondary winding S 22 Is connected to the twenty-first switching tube Q 21 And a twenty-second switching tube Q 22 The other end of the first common node is connected to the second common node; transformer T 23 Is a secondary winding S 23 Is connected to a twenty-third switching tube Q 23 And a twenty-fourth switching tube Q 24 The other end of the first common node is connected to the second common node; i.e. secondary winding S 21 Secondary winding S 22 And secondary winding S 23 One end of each of the two nodes is connected to the same common node to realize mutual communication.
It is understood that the first common node and the second common node are different nodes.
The above examples one to six respectively show a plurality of different primary side circuits, secondary side circuits, and connection relations thereof with transformers, wherein the synchronous rectification circuits of the examples three and six can realize bidirectional operation of the circuits, compared with the full-wave rectification circuits of the examples two and five. In addition to the above examples, one skilled in the art may connect the transformer primary side of the present application to other types of circuits in series with each other according to the principles of the present application, provided that the circuit characteristics are satisfied, which the present application is not limited to.
In an embodiment, the leakage inductance of the transformer is used as the resonant inductance, that is, any one of the resonant inductances involved in the above embodiments may be integrated into the leakage inductance of the transformer corresponding to the resonant inductance. When the leakage inductance of the transformer is proper in size, the leakage inductance acts as an inductor, and a separate resonant inductor is not required to be arranged in the circuit.
Specifically, as mentioned above, the transformer used in the present application includes two primary windings and one secondary winding, and the secondary winding is disposed between the two primary windings, so that the distance between the two primary windings is further, and the coupling coefficient between the two primary windings is further lower. From the definition of the coupling coefficient, when the coupling coefficient is low, it means that leakage inductance of the transformer is large. Therefore, in this embodiment, in order to further simplify the circuit, the leakage inductance of the transformer is adjusted to a proper size in order to replace the resonant inductance in the circuit, so as to implement the integration of the resonant inductance. When the leakage inductance of the transformer is not large enough, the inductor can be connected in series outside the transformer at the same time, and the series inductor and the leakage inductance of the transformer are used as resonance inductors together. Referring specifically to fig. 6A to 6D, fig. 6A is a circuit topology diagram of the integrated circuit leakage inductance shown in fig. 4C;
FIG. 6B is a circuit topology diagram of the integrated circuit of FIG. 4D; FIG. 6C is a circuit topology diagram of the integrated circuit of FIG. 5C; fig. 6D is a circuit topology diagram of the integrated circuit of fig. 5D after leakage inductance.
In an embodiment, the present application further provides a current balancing system, where the current balancing system adopts any one of the DCDC circuits of the multiple transformers provided in the present application, and other circuit structures of the current balancing system are different according to different requirements, so that the other circuit structures of the current balancing system are not specifically limited in the present application.
According to the DCDC circuit and the current balancing system of the multi-transformer, on the premise of realizing the function of power parallel connection, through a very simple synchronous control technology, the power balancing between two power units, namely the natural current sharing, is naturally realized, so that the control scheme is simplified, and the reliability of the circuit is improved.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present application and are not meant to limit the scope of the invention, but to limit the scope of the invention.

Claims (11)

1. The DCDC circuit of the multi-transformer is characterized by comprising two LLC circuits, wherein each LLC circuit comprises a primary side circuit, a secondary side circuit and m transformers;
each transformer comprises two primary windings and a secondary winding arranged between the two primary windings;
the two-way LLC circuit comprises a first LLC circuit and a second LLC circuit, wherein a first primary winding of an ith transformer of the first LLC circuit and a first primary winding of an ith transformer of the second LLC circuit are connected in series and then connected to the corresponding primary circuit, and a second primary winding of the ith transformer of the first LLC circuit and a second primary winding of the ith transformer of the second LLC circuit are connected in series and then connected to the corresponding primary circuit; the secondary windings of each transformer are connected to the corresponding secondary circuit; i is more than or equal to 1 and less than or equal to m, and both i and m are positive integers.
2. The multi-transformer DCDC circuit of claim 1, wherein said primary side circuit comprises a full bridge circuit, m being 1;
the primary circuit of the first LLC circuit comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected in series and then connected in parallel; the primary side circuit of the second LLC circuit comprises a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, wherein the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube are respectively connected in series and then connected in parallel;
the first primary winding of the transformer of the first LLC circuit is connected in series with a group of resonance capacitors and resonance inductors and then is connected between a first switching tube and a second switching tube; a first primary winding of a transformer of the second LLC circuit is connected between the third switching tube and the fourth switching tube;
the second primary winding of the transformer of the first LLC circuit is connected between the seventh switching tube and the eighth switching tube, and the second primary winding of the transformer of the second LLC circuit is connected between the fifth switching tube and the sixth switching tube after being connected with a set of resonance capacitor and resonance inductor in series.
3. The DCDC circuit of the multiple transformer of claim 2, wherein said secondary side circuit comprises a full wave rectifying circuit;
the secondary side circuit of the first LLC circuit comprises a first diode, a second diode, a third diode and a fourth diode, wherein the first diode, the second diode, the third diode and the fourth diode are respectively connected in series and then connected in parallel; the secondary side circuit of the second LLC circuit comprises a fifth diode, a sixth diode, a seventh diode and an eighth diode, wherein the fifth diode, the sixth diode, the seventh diode and the eighth diode are respectively connected in series and then connected in parallel;
one end of a secondary winding of a transformer of the first LLC circuit is connected between the first diode and the second diode, and the other end of the secondary winding is connected between the third diode and the fourth diode;
one end of a secondary winding of the transformer of the second LLC circuit is connected between the fifth diode and the sixth diode, and the other end is connected between the seventh diode and the eighth diode.
4. The DCDC circuit of the multiple transformer of claim 2, wherein the secondary side circuit comprises a synchronous rectification circuit;
The secondary side circuit of the first LLC circuit comprises a ninth switching tube, a tenth switching tube, an eleventh switching tube and a twelfth switching tube, wherein the ninth switching tube, the tenth switching tube, the eleventh switching tube and the twelfth switching tube are respectively connected in series and then connected in parallel; the secondary side circuit of the second LLC circuit comprises a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube and a sixteenth switching tube, and the thirteenth switching tube, the fourteenth switching tube, the fifteenth switching tube and the sixteenth switching tube are respectively connected in series and then connected in parallel;
one end of a secondary winding of the transformer of the first LLC circuit is connected between the ninth switching tube and the tenth switching tube, and the other end of the secondary winding of the transformer of the first LLC circuit is connected between the eleventh switching tube and the twelfth switching tube;
one end of a secondary winding of the transformer of the second LLC circuit is connected between the thirteenth switching tube and the fourteenth switching tube, and the other end of the secondary winding of the transformer of the second LLC circuit is connected between the fifteenth switching tube and the sixteenth switching tube.
5. The multi-transformer DCDC circuit of claim 1, wherein said primary side circuit comprises a three-phase bridge circuit, m having a value of 3;
the primary circuit of the first LLC circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube, wherein the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are respectively connected in series and then connected in parallel;
The primary side circuit of the second LLC circuit comprises a seventh switching tube, an eighth switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube and a twelfth switching tube, wherein the seventh switching tube, the eighth switching tube, the ninth switching tube, the tenth switching tube, the eleventh switching tube and the twelfth switching tube are respectively connected in series and then connected in parallel;
the second primary winding of the first transformer of the first LLC circuit is connected between the first switching tube and the second switching tube, and the first primary winding of the first transformer of the second LLC circuit is connected between the seventh switching tube and the eighth switching tube; the first primary winding of the first transformer of the first LLC circuit is connected with one group of resonance capacitor and resonance inductor in series, and then is connected with the second primary winding of the first transformer of the second LLC circuit through the other group of resonance capacitor and resonance inductor;
a second primary winding of a second transformer of the first LLC circuit is connected between the third switching tube and the fourth switching tube, and the first primary winding of the second transformer of the second LLC circuit is connected between the ninth switching tube and the tenth switching tube; the first primary winding of the second transformer of the first LLC circuit is connected with one group of resonance capacitor and resonance inductor in series and then connected with the second primary winding of the second transformer of the second LLC circuit through the other group of resonance capacitor and resonance inductor;
The second primary winding of the third transformer of the first LLC circuit is connected between the fifth switching tube and the sixth switching tube, and the first primary winding of the third transformer of the second LLC circuit is connected between the eleventh switching tube and the twelfth switching tube; the first primary winding of the third transformer of the first LLC circuit is connected with one group of resonance capacitor and resonance inductor in series, and then is connected with the second primary winding of the third transformer of the second LLC circuit through the other group of resonance capacitor and resonance inductor.
6. The multi-transformer DCDC circuit of claim 5, wherein said secondary side circuit comprises a full wave rectifying circuit;
the secondary side circuit of the first LLC circuit comprises a first diode, a second diode, a third diode, a fourth diode, a fifth diode and a sixth diode, wherein the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode are respectively connected in series and then connected in parallel; the secondary side circuit of the second LLC circuit comprises a seventh diode, an eighth diode, a ninth diode, a twelfth diode, an eleventh diode and a twelfth diode, wherein the seventh diode and the eighth diode, the ninth diode and the twelfth diode, the eleventh diode and the twelfth diode are respectively connected in series and then connected in parallel;
The first end of the secondary winding of the first transformer of the first LLC circuit is connected between the first diode and the second diode, the first end of the secondary winding of the second transformer of the first LLC circuit is connected between the third diode and the fourth diode, the first end of the secondary winding of the third transformer of the first LLC circuit is connected between the fifth diode and the sixth diode, and the second end of the secondary winding of the first transformer of the first LLC circuit, the second end of the secondary winding of the second transformer of the first LLC circuit and the second end of the secondary winding of the third transformer of the first LLC circuit are connected;
the first end of the secondary winding of the first transformer of the second LLC circuit is connected between the seventh diode and the eighth diode, the first end of the secondary winding of the second transformer of the second LLC circuit is connected between the ninth diode and the twelfth diode, the first end of the secondary winding of the third transformer of the second LLC circuit is connected between the eleventh diode and the twelfth diode, and the second end of the secondary winding of the first transformer of the second LLC circuit, the second end of the secondary winding of the second transformer of the second LLC circuit and the second end of the secondary winding of the third transformer of the second LLC circuit are connected.
7. The multi-transformer DCDC circuit of claim 5, wherein said secondary side circuit comprises a synchronous rectification circuit;
the secondary side circuit of the first LLC circuit comprises a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube and an eighteenth switching tube, wherein the thirteenth switching tube and the fourteenth switching tube, the fifteenth switching tube and the sixteenth switching tube, the seventeenth switching tube and the eighteenth switching tube are respectively connected in series and then connected in parallel; the secondary side circuit of the second LLC circuit comprises a nineteenth switching tube, a twenty-first switching tube, a twenty-second switching tube, a twenty-third switching tube and a twenty-fourth switching tube, wherein the nineteenth switching tube, the twenty-first switching tube, the twenty-second switching tube, the twenty-third switching tube and the twenty-fourth switching tube are respectively connected in series and then connected in parallel;
the first end of the secondary winding of the first transformer of the first LLC circuit is connected between a thirteenth switching tube and a fourteenth switching tube, the first end of the secondary winding of the second transformer of the first LLC circuit is connected between a fifteenth switching tube and a sixteenth switching tube, the first end of the secondary winding of the third transformer of the first LLC circuit is connected between a seventeenth switching tube and an eighteenth switching tube, and the second end of the secondary winding of the first transformer of the first LLC circuit, the second end of the secondary winding of the second transformer of the first LLC circuit and the second end of the secondary winding of the third transformer of the first LLC circuit are connected;
The first end of the secondary winding of the first transformer of the second LLC circuit is connected between the nineteenth switching tube and the twentieth switching tube, the first end of the secondary winding of the second transformer of the second LLC circuit is connected between the twenty first switching tube and the twenty second switching tube, the first end of the secondary winding of the third transformer of the second LLC circuit is connected between the twenty third switching tube and the twenty fourth switching tube, and the second end of the secondary winding of the first transformer of the second LLC circuit, the second end of the secondary winding of the second transformer of the second LLC circuit and the second end of the secondary winding of the third transformer of the second LLC circuit are connected.
8. The DCDC circuit of a multiple transformer according to any of claims 2 to 7, wherein any one of the resonant inductances of the DCDC circuit of the multiple transformer is integrated in the leakage inductance of the transformer to which the resonant inductance corresponds.
9. A multi-transformer DCDC circuit according to any of claims 1 to 7, characterized in that the primary side circuit of the first LLC circuit is connected in parallel with the primary side circuit of the second LLC circuit.
10. A multi-transformer DCDC circuit according to any of claims 1 to 7, characterized in that the primary side circuit of a first LLC circuit is connected in series with the primary side circuit of a second LLC circuit.
11. A current balancing system, characterized in that it employs the DCDC circuit of the multi-transformer according to any one of claims 1 to 10.
CN202223398913.2U 2022-12-16 2022-12-16 DCDC circuit and current balancing system of multiple transformers Active CN218997940U (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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