Equivalent bidirectional conversion CLLC power transformation assembly

Abstract

The utility model relates to the technical field of CLLC, and discloses an equivalent bidirectional conversion CLLC power transformation assembly, which comprises a transformer (220), the transformer (220) at least comprises a primary winding (150), a secondary winding (160), an isolation plate (140) and a magnetic core (130), and the turn ratio of the secondary winding (160) to the primary winding (150) is set to be consistent; the isolation plate (140) isolates the primary winding (150) and the secondary winding (160) at equal intervals so as to form distributed capacitance between the windings; the primary winding (150) and the secondary winding (160) are respectively wound on the magnetic core (130), and the magnetic core (130) is isolated from the contact surface of the primary winding (150) and the contact surface of the secondary winding (160) through the insulating component.

Description

Technical Field

[0001] This utility model relates to the field of CLLC technology, and more specifically, to an equivalent bidirectional conversion CLLC power transformer component. Background Technology

[0002] The CLLC resonant bidirectional DC / DC converter (CLLC resonant converter for short) evolved from the LLC resonant converter by adding an additional resonant capacitor to the secondary side. It not only inherits the advantages of the LLC resonant converter in achieving soft switching, but also has bidirectional power transmission capability and voltage boosting capability.

[0003] However, in the existing CLLC converter circuit, the magnetic core device is composed of two different resonant inductors and a transformer. When the transformer operates in different modes, the bidirectional conversion performance is not equal due to the inconsistent number of turns of the primary winding and the secondary winding, resulting in low operating efficiency of the OBC (on-board charger) equipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an equivalent bidirectional switching CLLC power transformer component, which addresses the shortcomings of the prior art where the bidirectional switching performance is not equal when the transformer operates in different modes due to the inconsistent number of turns in the primary and secondary windings.

[0005] The technical solution adopted by this utility model to solve its technical problem is: constructing an equivalent bidirectional conversion CLLC power transformer component, including a transformer, wherein the transformer includes at least...

[0006] The primary winding is used for coupling and transmitting current.

[0007] The secondary winding, used for coupling and transmitting current, has the same turns ratio as the primary winding.

[0008] An isolation plate, disposed between the primary winding and / or the secondary winding, equidistantly separates the primary winding from the secondary winding to form a distributed capacitance between the windings; and

[0009] The magnetic core has an insulating component wrapped around its outer end face. The primary winding and the secondary winding are respectively wound on the magnetic core. The insulating component isolates the magnetic core from the contact surfaces of the primary winding and the secondary winding.

[0010] In some embodiments, a square groove is provided on the top of the isolation plate, and a magnetic leakage sheet is provided in the square groove.

[0011] In some embodiments, the isolation plate separates the distance between the primary winding, the distance between the secondary winding, and the distance between the primary and secondary windings to obtain the distributed capacitance between the windings. The distributed capacitance, in conjunction with the leakage magnetic sheet, adjusts the leakage magnetic circuit to obtain a resonant inductance.

[0012] In some implementations, the turns ratio of the primary winding and the secondary winding forms the required voltage conversion to obtain the magnetizing inductance.

[0013] In some embodiments, when the transformer switches between charging and discharging modes, the turns ratio of the primary winding and the secondary winding are the same, and the leakage magnetic circuit operates in the same way, so that the distributed capacitance, the resonant inductance and the magnetizing inductance of the transformer are the same, making the bidirectional conversion equivalent.

[0014] In some implementations, the left and right connecting lines of the primary winding or the secondary winding can be connected in parallel or in series.

[0015] In some embodiments, it also includes a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET.

[0016] The first MOSFET and the third MOSFET are connected in series.

[0017] The second MOSFET is connected in series with the fourth MOSFET, and then connected in parallel with the first MOSFET and the third MOSFET.

[0018] The source of the first MOS transistor is connected to one end of the primary winding.

[0019] The drain of the fourth MOS transistor is connected to the other end of the primary winding through a distributed capacitance.

[0020] In some implementations, a fifth MOSFET, a sixth MOSFET, a seventh MOSFET, and an eighth MOSFET are also included.

[0021] The fifth MOS transistor is connected in series with the seventh MOS transistor.

[0022] The sixth MOSFET is connected in series with the eighth MOSFET, and then connected in parallel with the fifth MOSFET and the seventh MOSFET.

[0023] The source of the sixth MOS transistor is connected to one end of the secondary winding.

[0024] The drain of the seventh MOS transistor is connected to the other end of the secondary winding through another distributed capacitance.

[0025] The equivalent bidirectional conversion CLLC power transformer assembly described in this utility model includes a transformer, which at least includes a primary winding, a secondary winding, an isolation plate, and a magnetic core. The turns ratio of the secondary winding is set to be the same as that of the primary winding. The isolation plate equidistantly separates the primary and secondary windings to form distributed capacitance between the windings. The primary and secondary windings are respectively wound on the magnetic core, and the contact surfaces of the magnetic core and the primary and secondary windings are isolated by an insulating component. Compared with the prior art, when the transformer performs bidirectional power conversion, i.e., when operating in different charging / discharging modes, the number of turns of the primary and secondary windings is the same, making the bidirectional performance (magnetic inductance, distributed capacitance, resonant inductance) of the transformer identical. This bidirectional conversion achieves equivalence, simplifies circuit design, and effectively improves the operating efficiency of OBC (on-board charger) equipment. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0027] Figure 1 This is a perspective view of an embodiment of the transformer assembly provided by this utility model;

[0028] Figure 2 This is another perspective view of an embodiment of the transformer assembly provided by this utility model;

[0029] Figure 3 This is an exploded view of an embodiment of the transformer assembly provided by this utility model;

[0030] Figure 4 This is a cross-sectional view of an embodiment of the transformer assembly provided by this utility model;

[0031] Figure 5 This is another exploded view of an embodiment of the transformer assembly provided by this utility model;

[0032] Figure 6 This is a schematic diagram of bidirectional power conversion of an embodiment of the transformer component provided by this utility model. Detailed Implementation

[0033] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0034] like Figures 1-6 As shown, in the first embodiment of the equivalent bidirectional conversion CLLC power transformer assembly of this utility model, the equivalent bidirectional conversion CLLC power transformer assembly (210-230) includes at least a first bridge arm module 210, a transformer 220, and a second bridge arm module 230.

[0035] The first bridge arm module 210 is used to receive the power input from the vehicle bus terminal (corresponding to Vbus), and after being converted by the transformer 220, it is output to the battery terminal (corresponding to Vbattery) via the second bridge arm module 230 to output a charging signal.

[0036] The transformer 220 has the functions of isolation, voltage transformation and bidirectional power conversion, and is used to receive voltage signals input from the first bridge arm module 210 or the second bridge arm module 230;

[0037] The second bridge arm module 230 is used to receive the power input from the battery terminal (corresponding to Vbattery), and after being converted by the transformer 220, it is output to the vehicle bus terminal (corresponding to Vbus) via the first bridge arm module 210.

[0038] Specifically, the transformer 220 includes at least a lower support 110, an upper support 120, a magnetic core 130, an isolation plate 140, a multi-strand primary winding 150, and a multi-strand secondary winding 160.

[0039] The lower support 110 and the upper support 120 are used to support the magnetic core 130, the isolation plate 140, the primary winding 150, and the secondary winding 160.

[0040] like Figure 2 As shown, two or more terminals 111 are provided on the support member 110 for fixing the taps of the multi-strand primary winding 150 and the multi-strand secondary winding 160.

[0041] The upper support member 120 is provided with two or more terminals 121, which are used to fix the taps of multiple sets of primary windings 150 and multiple sets of secondary windings 160.

[0042] The magnetic core 130 serves to enhance the magnetic circuit, reduce electromagnetic interference, improve the stability of the transformer, and enhance energy conversion and transmission.

[0043] Among them, the magnetic core 130 realizes the conversion and transmission of electrical energy through the change of magnetic flux. Especially in high-frequency applications, the magnetic permeability and loss characteristics of the magnetic core 130 have a significant impact on the performance of the transformer 220.

[0044] The isolation plate 140 uses the magnetic field coupling of the transformer 220 to isolate the circuits at the input and output ends. There is no electrical connection between the input and output circuits. Energy is transferred only through the magnetic field of the transformer 220, thus achieving electrical isolation.

[0045] The primary winding 150 is used to convert voltage, regulate voltage and limit current. The primary winding 150 is an important component of the transformer 220. Its function is to transfer the voltage of the primary circuit to the secondary winding 160 of the transformer 220.

[0046] The function of the secondary winding 160 is to introduce electrical energy from the primary winding 150 into the transformer 220, and then convert it into the required electrical energy output to the secondary load.

[0047] Among them, a multi-strand primary winding 150 is provided in the transformer 220. The left and right connecting lines (or taps) of the multi-strand primary winding 150 can be connected in parallel or in series. The taps are fixed in the terminals 111 of the support member 110 and the terminals 121 of the upper support member 120, which are used for coupling and transmitting current.

[0048] The secondary winding 160 has the same number of strands as the primary winding 150, and its characteristics (such as number of turns, turns ratio, and wire diameter) are also the same as those of the primary winding 150. The left and right connecting wire sides (or taps) of the multi-strand secondary winding 160 can be connected in parallel or in series. The taps are fixed in the terminals 111 of the support member 110 and the terminals 121 of the upper support member 120, and are used for coupling and transmitting current.

[0049] Furthermore, the isolation plate 140 is disposed between the primary winding 150 and / or the secondary winding 160 to equidistantly separate the primary winding 150 and the secondary winding 160, thereby forming two distributed capacitances (C101, C102) between the primary winding 150 and / or the secondary winding 160.

[0050] Among them, such as Figure 3 As shown, the magnetic core 130 is a cuboid with a hollow structure 130a. An insulating component 180 is wrapped around the outer end face of the magnetic core 130, that is, the magnetic core 130 is wrapped by the insulating component 180.

[0051] The primary winding 150 and the secondary winding 160 are wound on the magnetic core 130 respectively. The contact surfaces of the magnetic core 130 and the primary winding 150 and the secondary winding 160 are isolated by the insulating component 180 to avoid mutual interference between the primary winding 150 and the secondary winding 160.

[0052] This technical solution is applicable to transformers within an OBC (On-Board Circuit), enabling bidirectional power conversion. Furthermore, when the transformer operates in different modes, the characteristics of the primary and secondary windings are identical, and the magnetic circuit operation is the same, achieving equivalent bidirectional conversion performance and thus improving the operating efficiency of the OBC equipment.

[0053] In some implementations, such as Figure 5 As shown, in order to reduce the magnetic field leakage of transformer 220, improve the efficiency of transformer 220 and reduce energy loss, a magnetic leakage sheet 170 can be attached inside the isolation plate 140. Through its high magnetic permeability, the magnetic field of the transformer is more concentrated, reducing unnecessary magnetic field leakage.

[0054] Specifically, a square groove 140a is provided on the top of the isolation plate 140, and a magnetic leakage sheet 170 is provided in the square groove 140a.

[0055] In some implementations, such as Figure 4 As shown, to obtain an ideal resonant inductance, an isolation plate 140 can be set between the primary winding 150 and the secondary winding 160. The isolation plate 140 isolates the distance between the primary winding 150, the secondary winding 160, and the distance between the primary and secondary windings. The distance between the primary winding 150 and the secondary winding 160 are equally spaced, thereby obtaining the distributed capacitance (C101, C102) between the windings. The distributed capacitance (C101, C102) combined with the leakage magnetic sheet 170 adjusts the leakage magnetic circuit to obtain the resonant inductance (corresponding to Lr).

[0056] Among them, the isolation plate 140 enables the transformer 220 to better conform to the electrical insulation distance specifications, while greatly improving the voltage level of the transformer 200 from 800V to 10000V high voltage requirements.

[0057] In some implementations, such as Figure 4 As shown, in order to obtain the ideal magnetizing inductance, the turns ratio of the primary winding 150 and the secondary winding 160 can be adjusted to achieve the required voltage conversion to obtain the magnetizing inductance (corresponding to Lm).

[0058] When the transformer 220 switches between charging and discharging modes, the turns ratio of the primary winding 150 and the secondary winding 160 are the same, and the leakage magnetic circuit operates in the same way. This makes the distributed capacitance (C101, C102), resonant inductance (corresponding to Lr), and magnetizing inductance (corresponding to Lm) of the transformer 220 the same. The three form a resonant tank, which acts as a DC blocking capacitor. At the same time, it balances the magnetic flux of the transformer 220 and prevents saturation. This makes the bidirectional switching of the transformer 220 equivalent, which can improve the bidirectional energy efficiency to 99.5%.

[0059] The multi-layered design of the primary winding 150 and the secondary winding 160 results in greater heat dissipation, and the more integrated transformer 220 can increase power by 300% for the same volume.

[0060] In some implementations, such as Figure 6 As shown, the first bridge arm module 210 includes a first MOSFET Q101, a second MOSFET Q102, a third MOSFET Q103, and a fourth MOSFET Q104. The above-mentioned MOSFETs are N-channel MOSFETs and all have the function of switching.

[0061] Specifically, the first MOSFET Q101 and the third MOSFET Q103 are connected in series.

[0062] The drains of the first MOSFET Q101 and the second MOSFET Q102 are connected to the positive terminal of the vehicle bus (corresponding to Vbus).

[0063] The sources of the third MOSFET Q103 and the fourth MOSFET Q104 are connected to the negative terminal of the vehicle bus (corresponding to Vbus).

[0064] The second MOSFET Q102 and the fourth MOSFET Q104 are connected in series, and then connected in parallel with the first MOSFET Q101 and the third MOSFET Q103.

[0065] The source of the first MOSFET Q101 is connected to one end of the primary winding 150 (corresponding to Lr1).

[0066] The drain of the fourth MOSFET Q104 is connected to the other end of the primary winding 150 through a distributed capacitor (corresponding to C101).

[0067] Specifically, when the first MOSFET Q101 and the fourth MOSFET Q104 are turned on, and the second MOSFET Q102 and the third MOSFET Q103 are turned off, the charging mode of the vehicle bus terminal (corresponding to Vbus) is activated. The voltage of the positive half-cycle is input to the battery terminal (corresponding to Vbattery) through the primary winding 150, the secondary winding 160, and the second bridge arm module 230.

[0068] When the second MOSFET Q102 and the third MOSFET Q103 are turned on, and the first MOSFET Q101 and the fourth MOSFET Q104 are turned off, the charging mode of the vehicle bus terminal (corresponding to Vbus) is activated, and the voltage of the negative half-cycle is input to the battery terminal (corresponding to Vbattery) through the primary winding 150, the secondary winding 160 and the second bridge arm module 230.

[0069] In some implementations, such as Figure 6 As shown, the second bridge arm module 230 includes a fifth MOSFET Q105, a sixth MOSFET Q106, a seventh MOSFET Q107, and an eighth MOSFET Q108. The above MOSFETs are N-channel MOSFETs and all have the function of switching.

[0070] Among them, the fifth MOSFET Q105 and the seventh MOSFET Q107 are connected in series.

[0071] The drains of the fifth MOSFET Q105 and the sixth MOSFET Q106 are connected to the positive terminal of the battery (corresponding to Vbattery).

[0072] The sources of the seventh MOSFET Q107 and the eighth MOSFET Q108 are connected to the negative terminal of the battery (corresponding to Vbattery).

[0073] The sixth MOSFET Q106 and the eighth MOSFET Q108 are connected in series, and then connected in parallel with the fifth MOSFET Q105 and the seventh MOSFET Q107.

[0074] The source of the sixth MOSFET Q106 is connected to one end of the secondary winding 160 (corresponding to Lr2).

[0075] The drain of the seventh MOSFET Q107 is connected to the other end of the secondary winding 160 through another distributed capacitor (corresponding to C102).

[0076] Specifically, when the sixth MOSFET Q106 and the seventh MOSFET Q107 are turned on, and the fifth MOSFET Q105 and the eighth MOSFET Q108 are turned off, the discharging mode of the vehicle bus terminal (corresponding to Vbus) is activated. The voltage of the positive half-cycle is input to the vehicle bus terminal (corresponding to Vbus) through the secondary winding 160, the primary winding 150, and the first bridge arm module 210.

[0077] When the fifth MOSFET Q105 and the eighth MOSFET Q108 are turned on, and the sixth MOSFET Q106 and the seventh MOSFET Q107 are turned off, the discharging mode of the vehicle bus terminal (corresponding to Vbus) is activated. The voltage of the negative half-cycle is input to the vehicle bus terminal (corresponding to Vbus) through the secondary winding 160, the primary winding 150 and the first bridge arm module 210.

[0078] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1.A power transformer assembly of equivalent bidirectional conversion CLLC, comprising a transformer, wherein the transformer comprises at least a primary winding for coupling transmission current; a secondary winding for coupling transmission current, which is set to be consistent with the turns ratio of the primary winding; an isolation plate arranged between the primary winding and / or the secondary winding, which separates the primary winding and the secondary winding at equal distance to form a distributed capacitance between the windings; and a magnetic core, whose outer end surface is wrapped with an insulation assembly, and the primary winding and the secondary winding are wound on the magnetic core, and the contact surface of the magnetic core and the primary winding and the secondary winding is separated by the insulation assembly. 2.The power transformer assembly of equivalent bidirectional conversion CLLC according to claim 1, wherein a square groove is arranged on the upper surface of the isolation plate, and a magnetic leakage sheet is arranged in the square groove. 3.The power transformer assembly of equivalent bidirectional conversion CLLC according to claim 2, wherein the isolation plate separates the distance of the primary winding, the distance of the secondary winding, and the distance of the primary / secondary winding to obtain the distributed capacitance between the windings, and the distributed capacitance adjusts the magnetic leakage path together with the magnetic leakage sheet to obtain a resonant inductance. 4.The power transformer assembly of equivalent bidirectional conversion CLLC according to claim 3, wherein the turns ratio of the primary winding and the secondary winding forms the required voltage conversion to obtain an excitation inductance. 5.The power transformer assembly of equivalent bidirectional conversion CLLC according to claim 4, wherein when the transformer switches between the charging / discharging two different working modes, the turns ratio of the primary winding and the secondary winding is consistent, and the magnetic leakage path operates in the same way, so that the distributed capacitance, the resonant inductance and the excitation inductance of the transformer are the same, and the bidirectional conversion is equivalent. 6.The power transformer assembly of equivalent bidirectional conversion CLLC according to claim 5, wherein the left and right connection lines of the primary winding or the secondary winding can be connected in parallel or in series. 7.The power transformer assembly of equivalent bidirectional conversion CLLC according to any one of claims 1-6, further comprising a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube, wherein the first MOS tube and the third MOS tube are connected in series, the second MOS tube and the fourth MOS tube are connected in series and then connected in parallel with the first MOS tube and the third MOS tube, the source of the first MOS tube is connected to one end of the primary winding, and the drain of the fourth MOS tube is connected to the other end of the primary winding through a distributed capacitance. 8.The power transformer assembly of equivalent bidirectional conversion CLLC according to any one of claims 1-6, further comprising a fifth MOS tube, a sixth MOS tube, a seventh MOS tube and an eighth MOS tube, wherein the fifth MOS tube and the seventh MOS tube are connected in series, the sixth MOS tube and the eighth MOS tube are connected in series and then connected in parallel with the fifth MOS tube and the seventh MOS tube. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The sixth MOS tube and the eighth MOS tube are connected in series, and then connected in parallel with the fifth MOS tube and the seventh MOS tube, The source of the sixth MOS tube is connected with one end of the secondary winding, The drain of the seventh MOS tube is connected with the other end of the secondary winding through another distributed capacitor.

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