Common-mode rejection circuit of bidirectional full-bridge CLLC resonant converter and electronic equipment

Abstract

The utility model discloses a common-mode rejection circuit of a bidirectional full-bridge CLLC resonant converter and electronic equipment, and belongs to the technical field of power electronics. The common-mode rejection circuit comprises an integrated transformer, a primary side full-bridge switch unit, a secondary side full-bridge switch unit, a first resonant capacitor and a second resonant capacitor, the integrated transformer comprises a magnetic core group, a first resonant inductor, a second resonant inductor, a primary winding, a secondary winding, a third resonant inductor and a fourth resonant inductor; the first resonant inductor, the second resonant inductor and the primary winding are wound on the magnetic core group to form a first common-mode suppression path to suppress common-mode noise of the primary full-bridge switch unit; and the third resonant inductor, the fourth resonant inductor and the secondary winding are wound on the magnetic core group to form a second common-mode suppression path to suppress the common-mode noise of the secondary full-bridge switch unit. According to the invention, the switching noise of the CLLC can be suppressed under the condition that the size of the filter is not increased.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a common-mode suppression circuit and electronic equipment for a bidirectional full-bridge CLLC resonant converter. Background Art

[0002] Existing CLLC circuits (capacitive LLC resonant converters) primarily consist of resonant inductors, resonant capacitors, switches, and transformers. Because switching devices are not ideal in real applications, the switching process generates both differential-mode current components required by the circuit and common-mode current components, leading to common-mode noise and affecting circuit stability.

[0003] Currently, CLLC switching noise usually requires a filter to suppress it, which makes it difficult to reduce the size of the EMC filter (Electromagnetic Compatibility), making it impossible to meet the unshielded EMC certification requirements of some electronic equipment. Utility Model Content

[0004] The main purpose of this application is to provide a common-mode suppression circuit and electronic equipment for a bidirectional full-bridge CLLC resonant converter, aiming to suppress the switching noise of the CLLC without increasing the volume of the filter.

[0005] To achieve the above object, the present application provides a common-mode suppression circuit, which includes: an integrated transformer, a primary full-bridge switch unit, a secondary full-bridge switch unit, a first resonant capacitor, and a second resonant capacitor;

[0006] The integrated transformer includes a magnetic core group, a first resonant inductor, a second resonant inductor, a primary winding, a secondary winding, a third resonant inductor, and a fourth resonant inductor;

[0007] One end of the first resonant inductor is connected to a midpoint of one bridge arm of the primary full-bridge switch unit via the first resonant capacitor, and the other end of the first resonant inductor is connected to a midpoint of the other bridge arm of the primary full-bridge switch unit via the primary winding and the second resonant inductor in sequence;

[0008] One end of the third resonant inductor is connected to a midpoint of one bridge arm of the secondary full-bridge switch unit via the second resonant capacitor, and the other end of the third resonant inductor is connected to a midpoint of the other bridge arm of the secondary full-bridge switch unit via the secondary winding and the fourth resonant inductor in sequence;

[0009] The first resonant inductor, the second resonant inductor and the primary winding are wound on the magnetic core group to form a first common-mode suppression path to suppress the common-mode noise of the primary full-bridge switch unit;

[0010] The third resonant inductor, the fourth resonant inductor and the secondary winding are wound on the magnetic core group to form a second common-mode suppression path to suppress the common-mode noise of the secondary full-bridge switch unit.

[0011] In one embodiment, the magnetic core group includes two side columns and a first winding portion and a second winding portion symmetrically arranged between the two side columns, the first winding portion and the second winding portion are each divided into three winding areas by two middle magnetic columns, and the integrated transformer includes a first coil and a second coil;

[0012] The first section of the first coil is wound around the first winding area of ​​the first winding portion to form the first resonant inductor, the second section is wound around the second winding area of ​​the first winding portion and the second winding area of ​​the second winding portion to form the primary winding, and the third section is wound around the first winding area of ​​the second winding portion to form the second resonant inductor; wherein the first winding area of ​​the first winding portion and the first winding area of ​​the second winding portion are arranged opposite to each other;

[0013] The first section of the second coil is wound around the third winding area of ​​the first winding part to form the third resonant inductor, the second section is wound around the second winding area of ​​the first winding part and the second winding area of ​​the second winding part to form the secondary winding, and the third section is wound around the third winding area of ​​the second winding part to form the fourth resonant inductor; wherein, the third winding area of ​​the first winding part and the third winding area of ​​the second winding part are arranged opposite to each other.

[0014] In one embodiment, the first winding area of ​​the first winding portion is set as a first magnetic core, the first winding area of ​​the second winding portion is set as a second magnetic core, the second winding area of ​​the first winding portion is set as a third magnetic core, the second winding area of ​​the second winding portion is set as a fourth magnetic core, the third winding area of ​​the first winding portion is set as a fifth magnetic core, and the third winding area of ​​the second winding portion is set as a sixth magnetic core;

[0015] The primary winding and the secondary winding are wound in an overlapping manner on the third magnetic core and the fourth magnetic core.

[0016] In one embodiment, at least one air gap is provided on the first magnetic core, the second magnetic core, the third magnetic core, the fourth magnetic core, the fifth magnetic core, and the sixth magnetic core.

[0017] In one embodiment, the air gaps on the first magnetic core and the second magnetic core are symmetrical, the air gaps on the third magnetic core and the fourth magnetic core are symmetrical, and the air gaps on the fifth magnetic core and the sixth magnetic core are symmetrical.

[0018] In one embodiment, the first resonant inductor and the second resonant inductor have the same number of windings.

[0019] In one embodiment, the first resonant inductor and the second resonant inductor have different numbers of windings.

[0020] In one embodiment, the third resonant inductor and the fourth resonant inductor have the same number of windings.

[0021] In one embodiment, the third resonant inductor and the fourth resonant inductor have different numbers of windings.

[0022] In addition, to achieve the above-mentioned objectives, the present application also provides an electronic device, which includes the common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter as described above.

[0023] The present application proposes a common-mode suppression circuit and electronic device for a bidirectional full-bridge CLLC resonant converter, the common-mode suppression circuit comprising: an integrated transformer, a primary full-bridge switch unit, a secondary full-bridge switch unit, a first resonant capacitor, and a second resonant capacitor; the integrated transformer comprises a magnetic core group, a first resonant inductor, a second resonant inductor, a primary winding, a secondary winding, a third resonant inductor, and a fourth resonant inductor; one end of the first resonant inductor is connected to a midpoint of a bridge arm of the primary full-bridge switch unit via the first resonant capacitor, and the other end of the first resonant inductor is connected to the other bridge arm of the primary full-bridge switch unit via the primary winding and the second resonant inductor in sequence. The middle point of the arm; one end of the third resonant inductor is connected to the middle point of one bridge arm of the secondary full-bridge switch unit via the second resonant capacitor, and the other end of the third resonant inductor is connected to the middle point of the other bridge arm of the secondary full-bridge switch unit via the secondary winding and the fourth resonant inductor in sequence; the first resonant inductor, the second resonant inductor and the primary winding are wound on the magnetic core group to form a first common-mode suppression path to suppress the common-mode noise of the primary full-bridge switch unit; the third resonant inductor, the fourth resonant inductor and the secondary winding are wound on the magnetic core group to form a second common-mode suppression path to suppress the common-mode noise of the secondary full-bridge switch unit. The present application forms a common-mode suppression path inside the transformer by changing the winding method of the magnetic core device winding in the CLLC circuit, thereby reducing the demand for the common-mode impedance of the filter. Therefore, the switching noise of the CLLC can be suppressed without increasing the volume and number of stages of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 A schematic structural diagram of a common-mode suppression circuit for a bidirectional full-bridge CLLC resonant converter provided in an embodiment of the present application;

[0026] Figure 2 A schematic structural diagram of a magnetic core group of an integrated transformer in a common-mode suppression circuit of a bidirectional full-bridge CLLC resonant converter provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structure of a magnetic core group of an integrated transformer in a common-mode suppression circuit of a bidirectional full-bridge CLLC resonant converter provided in an embodiment of the present application after coil winding is completed;

[0028] Figure 4 A schematic structural diagram of another common-mode suppression circuit for a bidirectional full-bridge CLLC resonant converter provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0030] Description of Figure Numbers:

[0031] 100, integrated transformer; 200, primary full-bridge switch unit; 300, secondary full-bridge switch unit; 101, first magnetic core; 102, second magnetic core; 103, third magnetic core; 104, fourth magnetic core; 105, fifth magnetic core; 106, sixth magnetic core; L1-L4, first to fourth resonant inductors; C1-C4, first to fourth resonant capacitors.

[0032] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which both A and B are satisfied.

[0036] In this application, unless otherwise specified or limited, the terms "connect" and "fix" should be understood in a broad sense. For example, "fix" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] It should also be understood that references to "one embodiment" or "some embodiments" in the description of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures, or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in other embodiments," etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0038] Existing CLLC circuits (capacitive LLC resonant converters) primarily consist of resonant inductors, resonant capacitors, switches, and transformers. Because switching devices are not ideal in real applications, the switching process generates both differential-mode current components required by the circuit and common-mode current components, leading to common-mode noise and affecting circuit stability.

[0039] Currently, CLLC switching noise usually requires a filter to suppress it, which makes it difficult to reduce the size of the EMC filter (Electromagnetic Compatibility), making it impossible to meet the unshielded EMC certification requirements of some electronic devices (such as 22kW on-board OBC).

[0040] Based on this, the embodiment of the present application proposes a common-mode suppression circuit and electronic device for a bidirectional full-bridge CLLC resonant converter. By changing the winding method of the magnetic core device winding in the CLLC circuit, a common-mode suppression path is formed inside the transformer, thereby reducing the demand for the common-mode impedance of the filter. Therefore, the switching noise of the CLLC can be suppressed without increasing the volume and number of stages of the filter.

[0041] The common-mode suppression circuit and electronic device of the bidirectional full-bridge CLLC resonant converter provided in the embodiments of the present application are specifically illustrated by the following embodiments. First, the common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter is described.

[0042] The present application embodiment provides a common-mode suppression circuit for a bidirectional full-bridge CLLC resonant converter, referring to Figure 1 , Figure 1 This is a schematic structural diagram of a common-mode suppression circuit for a bidirectional full-bridge CLLC resonant converter provided in one embodiment of the present application. The common-mode suppression circuit for the bidirectional full-bridge CLLC resonant converter includes: an integrated transformer 100, a primary-side full-bridge switch unit 200, a secondary-side full-bridge switch unit 300, a first resonant capacitor C1, and a second resonant capacitor C2.

[0043] The integrated transformer 100 includes a magnetic core group, a first resonant inductor L1, a second resonant inductor L2, a primary winding, a secondary winding, a third resonant inductor L3, and a fourth resonant inductor L4;

[0044] One end of the first resonant inductor L1 is connected to a midpoint of one bridge arm of the primary full-bridge switch unit 200 via the first resonant capacitor C1, and the other end of the first resonant inductor L1 is connected to a midpoint of the other bridge arm of the primary full-bridge switch unit 200 via the primary winding and the second resonant inductor L2 in sequence;

[0045] One end of the third resonant inductor L3 is connected to a midpoint of one bridge arm of the secondary full-bridge switch unit 300 via the second resonant capacitor C2, and the other end of the third resonant inductor L3 is connected to a midpoint of the other bridge arm of the secondary full-bridge switch unit 300 via the secondary winding and the fourth resonant inductor L4 in sequence;

[0046] The first resonant inductor L1, the second resonant inductor L2 and the primary winding are wound on the magnetic core group to form a first common-mode suppression path to suppress the common-mode noise of the primary full-bridge switch unit 200;

[0047] The third resonant inductor L3 , the fourth resonant inductor L4 and the secondary winding are wound on the magnetic core group to form a second common-mode suppression path to suppress the common-mode noise of the secondary full-bridge switch unit 300 .

[0048] In this embodiment, the first end of the first resonant inductor L1 is electrically connected to the first end of the first resonant capacitor C1, the second end of the first resonant capacitor C1 is electrically connected to the midpoint of one bridge arm of the primary full-bridge switch unit 200, the second end of the first resonant inductor L1 is connected to the first end of the primary winding, the second end of the primary winding is connected to the first end of the second resonant inductor L2, and the second end of the second resonant inductor L2 is electrically connected to the midpoint of the other bridge arm of the primary full-bridge switch unit 200; the first end of the third resonant inductor L3 is connected to the first end of the secondary winding, the second end of the third resonant inductor L3 is electrically connected to the first end of the second resonant capacitor C2, and the second end of the second resonant capacitor C2 is electrically connected to the midpoint of one bridge arm of the secondary full-bridge switch unit 300; the first end of the fourth resonant inductor L4 is connected to the second end of the secondary winding, and the second end of the fourth resonant inductor L4 is electrically connected to the midpoint of the other bridge arm of the secondary full-bridge switch unit 300.

[0049] It should be noted that, since the common-mode suppression circuit provided in the present application is used for bidirectional charging, the first resonant capacitor C1 and the second resonant capacitor C2 need to exist at the same time. On the one hand, they are used to participate in the resonance of the circuit, that is, to cooperate with the resonant inductor to participate in the circuit resonance. On the other hand, the first resonant capacitor C1 and the second resonant capacitor C2 also play the role of isolating DC and preventing the transformer from being magnetized. When only the first resonant capacitor C1 or the second resonant capacitor C2 is included, the transformer still has a magnetized condition. In addition, when the common-mode suppression circuit provided in the present application is used for unidirectional charging, the circuit can also achieve the function by including any one of the first resonant capacitor C1 and the second resonant capacitor C2. The capacitor setting is specifically based on the actual situation of the circuit.

[0050] In some feasible embodiments, the magnetic core group includes two side columns and a first winding portion and a second winding portion symmetrically arranged between the two side columns, the first winding portion and the second winding portion are both divided into three winding areas by two middle magnetic columns, and the integrated transformer includes a first coil and a second coil;

[0051] The first section of the first coil is wound around the first winding area of ​​the first winding portion to form a first resonant inductor, the second section is wound around the second winding area of ​​the first winding portion and the second winding area of ​​the second winding portion to form a primary winding, and the third section is wound around the first winding area of ​​the second winding portion to form a second resonant inductor; wherein the first winding area of ​​the first winding portion and the first winding area of ​​the second winding portion are arranged opposite to each other;

[0052] The first section of the second coil is wound around the third winding area of ​​the first winding portion to form a third resonant inductor, the second section is wound around the second winding area of ​​the first winding portion and the second winding area of ​​the second winding portion to form a secondary winding, and the third section is wound around the third winding area of ​​the second winding portion to form a fourth resonant inductor; wherein, the third winding area of ​​the first winding portion and the third winding area of ​​the second winding portion are arranged relative to each other.

[0053] In this embodiment, the structural diagram of the magnetic core group without coils is as follows: Figure 2 As shown by Figure 2 It can be seen that the two winding parts of the magnetic core group are divided into three areas by two side columns and two middle magnetic columns. The left and right areas are resonant inductor winding areas, including the first winding area of ​​the first winding part located in the upper left, the first winding area of ​​the second winding part located in the lower left, the third winding area of ​​the first winding part located in the upper right, and the third winding area of ​​the second winding part located in the lower right. The middle area is the transformer winding area, including the second winding area of ​​the first winding part in the upper middle position and the second winding area of ​​the second winding part in the lower middle position. The three winding areas of the two winding parts are relatively arranged.

[0054] like Figure 2 As shown, in some feasible embodiments, the first winding area of ​​the first winding portion is set to the first magnetic core 101, the first winding area of ​​the second winding portion is set to the second magnetic core 102, the second winding area of ​​the first winding portion is set to the third magnetic core 103, the second winding area of ​​the second winding portion is set to the fourth magnetic core 104, the third winding area of ​​the first winding portion is set to the fifth magnetic core 105, and the third winding area of ​​the second winding portion is set to the sixth magnetic core 106; the primary winding and the secondary winding are wound on the third magnetic core 103 and the fourth magnetic core 104 in an overlapping manner.

[0055] As an example, the first coil can be wound from the first magnetic core 101 on the upper left (or from the second magnetic core 102 on the lower left), and wound one layer or multiple layers as needed. After the winding of the first magnetic core 101 on the upper left is completed, the winding is transferred to the third magnetic core 103 in the middle. After the winding of the third magnetic core 103 in the middle is completed, it is transferred to the fourth magnetic core 104 in the lower middle for winding. It is decided whether to wind the second layer as needed. After the winding of the middle magnetic core is completed, it returns to the second magnetic core 102 on the lower left for winding, and winds one layer or multiple layers as needed. Similarly, the second coil can be wound from the first magnetic core 101 on the upper left to the third magnetic core 103 in the middle. Start winding from the fifth magnetic core 105 on the upper right (if the first coil is wound from the second magnetic core 102 on the lower left, the second coil is wound from the sixth magnetic core 106 on the lower right), and wind one or more layers as needed. After winding the fifth magnetic core 105 on the upper right, the winding is transferred to the third magnetic core 103 in the middle. After the winding of the third magnetic core 103 in the middle is completed, the winding is transferred to the fourth magnetic core 104 in the lower middle. Decide whether to wind the second layer as needed. After winding in the middle winding area, return to the sixth magnetic core 106 on the lower right, and wind one or more layers as needed.

[0056] As an example, see Figure 3 , Figure 3 This is a schematic diagram of the structure of the magnetic core group after the coil is wound.

[0057] In this embodiment, the overlapping winding of the primary winding and the secondary winding can be that the primary winding is evenly wound along the third magnetic core 103 and the fourth magnetic core 104 in one layer, and the secondary winding is evenly wound on the primary winding in another layer. The purpose of overlapping winding is to increase the coupling between the primary winding and the secondary winding.

[0058] This embodiment provides a common-mode suppression circuit for a bidirectional full-bridge CLLC resonant converter. By changing the winding method of the magnetic core device winding in the CLLC circuit, a common-mode suppression path is formed inside the transformer, thereby reducing the demand for the common-mode impedance of the filter. Therefore, the switching noise of the CLLC can be suppressed without increasing the volume and number of stages of the filter.

[0059] In some feasible embodiments, at least one air gap is provided on the first magnetic core 101 , the second magnetic core 102 , the third magnetic core 103 , the fourth magnetic core 104 , the fifth magnetic core 105 and the sixth magnetic core 106 .

[0060] In some feasible embodiments, the air gaps on the first magnetic core 101 and the second magnetic core 102 are symmetrical, the air gaps on the third magnetic core 103 and the fourth magnetic core 104 are symmetrical, and the air gaps on the fifth magnetic core 105 and the sixth magnetic core 106 are symmetrical.

[0061] In this embodiment, if Figure 2As shown, the magnetic core in the three areas divided by the magnetic columns can have one or more symmetrical (or asymmetrical, not shown in the figure) air gaps according to actual needs to prevent the magnetic core from saturation.

[0062] In some feasible embodiments, the first resonant inductor L1 and the second resonant inductor L2 have the same number of windings.

[0063] In this embodiment, the number of turns of the coils of the first resonant inductor L1 and the second resonant inductor L2 is set to be the same, so that when current flows through the first resonant inductor L1 and the second resonant inductor L2, the magnetic flux generated on the winding poles is equal in magnitude, and thus the magnetic flux generated on the two magnetic poles is also equal in magnitude, thereby avoiding affecting the common-mode suppression effect due to different generated magnetic fluxes.

[0064] In some feasible embodiments, the first resonant inductor L1 and the second resonant inductor L2 have different numbers of windings.

[0065] In this embodiment, when the number of turns of the coils of the first resonant inductor L1 and the second resonant inductor L2 are different, the function to be implemented in this application can also be achieved, and common mode noise can be suppressed to a certain extent, but the suppression effect is relatively weakened.

[0066] In some feasible embodiments, the third resonant inductor L3 and the fourth resonant inductor L4 have the same number of windings.

[0067] In this embodiment, the number of turns of the coils of the third resonant inductor L3 and the fourth resonant inductor L4 is set to be the same, so that when current flows through the third resonant inductor L3 and the fourth resonant inductor L4, the magnetic flux generated on the winding poles is equal in magnitude, and thus the magnetic flux generated on the two magnetic poles is also equal in magnitude, thereby preventing the common-mode suppression effect from being affected by the different magnetic fluxes generated.

[0068] In some feasible embodiments, the third resonant inductor L3 and the fourth resonant inductor L4 have different numbers of windings.

[0069] In this embodiment, when the number of turns of the coils of the third resonant inductor L3 and the fourth resonant inductor L4 are different, the function to be implemented in this application can also be achieved, and a certain suppression effect on common-mode noise is played, but the suppression effect is relatively weakened.

[0070] In some possible embodiments, the resonant capacitor can be as follows Figure 1 The connection method shown in the figure is used in the common mode suppression circuit, but the connection method of the resonant capacitor is not limited to Figure 1 As shown in , in other embodiments, it is also possible to Figure 4The connection method shown in FIG is connected in the common mode suppression circuit. It should be noted that, for the above two connection methods, either one can be used, and the effects produced will not be affected. The specific connection can be made according to the actual situation.

[0071] Depend on Figure 4 It can be seen that Figure 1 The first resonant capacitor C1 and the second resonant capacitor C2 in the circuit change their positions simultaneously, which is equivalent to Figure 4 The third resonant capacitor C3 and the fourth resonant capacitor C4 are shown.

[0072] In this embodiment, the first end of the first resonant inductor L1 is connected to the midpoint of one bridge arm of the primary full-bridge switch unit 200, the second end of the first resonant inductor L1 is connected to the first end of the primary winding, the second end of the primary winding is connected to the first end of the second resonant inductor L2, the second end of the second resonant inductor L2 is electrically connected to the first end of the third resonant capacitor C3, and the second end of the third resonant capacitor C3 is electrically connected to the midpoint of the other bridge arm of the primary full-bridge switch unit 200; the first end of the third resonant inductor L3 is connected to the first end of the secondary winding, the second end of the third resonant inductor L3 is electrically connected to the midpoint of one bridge arm of the secondary full-bridge switch unit 300, the first end of the fourth resonant inductor L4 is connected to the second end of the secondary winding, the second end of the fourth resonant inductor L4 is electrically connected to the first end of the fourth resonant capacitor C4, and the second end of the fourth resonant capacitor C4 is electrically connected to the midpoint of the other bridge arm of the secondary full-bridge switch unit 300.

[0073] In addition, the present invention also provides an electronic device, referring to Figure 5 The electronic device includes the common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter provided in the above embodiment.

[0074] Since the electronic device proposed in this embodiment includes the common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter proposed in the above embodiments, it has the beneficial effects of the above embodiments. The specific working process and principle of the common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter are detailed in the common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter provided in the above embodiments. They will not be described one by one here, and they are all within the protection scope of this embodiment.

[0075] It should be noted that the technical solutions of the various embodiments of the present application can be combined with each other, but this must be based on the fact that they can be implemented by technical personnel in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0076] The above are merely optional embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A common-mode suppression circuit for a bidirectional full-bridge CLLC resonant converter, characterized in that: include: Integrated transformer, primary side full-bridge switch unit, secondary side full-bridge switch unit, first resonant capacitor, second resonant capacitor; The integrated transformer includes a magnetic core group, a first resonant inductor, a second resonant inductor, a primary winding, a secondary winding, a third resonant inductor, and a fourth resonant inductor; One end of the first resonant inductor is connected to a midpoint of one bridge arm of the primary full-bridge switch unit via the first resonant capacitor, and the other end of the first resonant inductor is connected to a midpoint of the other bridge arm of the primary full-bridge switch unit via the primary winding and the second resonant inductor in sequence; One end of the third resonant inductor is connected to a midpoint of one bridge arm of the secondary full-bridge switch unit via the second resonant capacitor, and the other end of the third resonant inductor is connected to a midpoint of the other bridge arm of the secondary full-bridge switch unit via the secondary winding and the fourth resonant inductor in sequence; The first resonant inductor, the second resonant inductor and the primary winding are wound on the magnetic core group to form a first common-mode suppression path to suppress the common-mode noise of the primary full-bridge switch unit; The third resonant inductor, the fourth resonant inductor and the secondary winding are wound on the magnetic core group to form a second common-mode suppression path to suppress the common-mode noise of the secondary full-bridge switch unit.

2. The common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter according to claim 1, wherein: The magnetic core group includes two side columns and a first winding portion and a second winding portion symmetrically arranged between the two side columns, the first winding portion and the second winding portion are each divided into three winding areas by two middle magnetic columns, and the integrated transformer includes a first coil and a second coil; The first section of the first coil is wound around the first winding area of ​​the first winding portion to form the first resonant inductor, the second section is wound around the second winding area of ​​the first winding portion and the second winding area of ​​the second winding portion to form the primary winding, and the third section is wound around the first winding area of ​​the second winding portion to form the second resonant inductor; wherein the first winding area of ​​the first winding portion and the first winding area of ​​the second winding portion are arranged opposite to each other; The first section of the second coil is wound around the third winding area of ​​the first winding part to form the third resonant inductor, the second section is wound around the second winding area of ​​the first winding part and the second winding area of ​​the second winding part to form the secondary winding, and the third section is wound around the third winding area of ​​the second winding part to form the fourth resonant inductor; wherein, the third winding area of ​​the first winding part and the third winding area of ​​the second winding part are arranged opposite to each other.

3. The common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter according to claim 2, wherein: The first winding area of ​​the first winding portion is set as a first magnetic core, the first winding area of ​​the second winding portion is set as a second magnetic core, the second winding area of ​​the first winding portion is set as a third magnetic core, the second winding area of ​​the second winding portion is set as a fourth magnetic core, the third winding area of ​​the first winding portion is set as a fifth magnetic core, and the third winding area of ​​the second winding portion is set as a sixth magnetic core; The primary winding and the secondary winding are wound in an overlapping manner on the third magnetic core and the fourth magnetic core.

4. The common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter according to claim 3, wherein: At least one air gap is provided on the first magnetic core, the second magnetic core, the third magnetic core, the fourth magnetic core, the fifth magnetic core, and the sixth magnetic core.

5. The common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter according to claim 4, characterized in that: The air gaps on the first magnetic core are symmetrical to those on the second magnetic core, the air gaps on the third magnetic core are symmetrical to those on the fourth magnetic core, and the air gaps on the fifth magnetic core are symmetrical to those on the sixth magnetic core.

6. The common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter according to claim 1, wherein: The first resonant inductor and the second resonant inductor have the same number of windings.

7. The common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter according to claim 1, wherein: The first resonant inductor and the second resonant inductor have different numbers of windings.

8. The common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter according to claim 1, wherein: The third resonant inductor and the fourth resonant inductor have the same number of windings.

9. The common-mode suppression circuit of the bidirectional full-bridge CLLC resonant converter according to claim 1, wherein: The third resonant inductor and the fourth resonant inductor have different numbers of windings.

10. An electronic device, characterized in that: The electronic device includes the common-mode rejection circuit of the bidirectional full-bridge CLLC resonant converter according to any one of claims 1 to 9.

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