Multiphase conversion circuit and multiphase converter

Abstract

One aspect of the utility model is a multi-phase conversion circuit comprising a primary side switching circuit. The primary side switching circuit includes a plurality of complementary pairs of transistors. The plurality of transistor complementary pairs are coupled in parallel. The multi-phase conversion circuit also comprises a resonant tank which is coupled to the primary side switching circuit and comprises a plurality of capacitors, a plurality of resonant inductors and a plurality of transformers. The multi-phase conversion circuit also includes a secondary side switching circuit coupled to the resonant tank, and the secondary side switching circuit is of a full bridge architecture. Each of a plurality of complementary transistor pairs of the primary side switching circuit includes a first transistor and a second transistor that are complementary. The first transistor and the second transistor are coupled in series. A node is arranged between the first transistor and the second transistor of each complementary pair of transistors. The node is coupled to a corresponding one of the plurality of resonant inductors of the resonant tank.

Description

Technical Field

[0001] This utility model relates to a multi-phase conversion circuit and a multi-phase converter, particularly a multi-phase conversion circuit and a multi-phase converter with a triangular inductor-capacitor Y-type (Δ-Lr&Cr-Y)-full bridge architecture. Background Technology

[0002] Currently, multi-phase conversion circuits or multi-phase converters primarily utilize a full-bridge architecture. However, errors in components within this architecture (such as resonant inductors or capacitors, or both) can lead to significant current errors. Furthermore, core losses and copper losses in these circuits also require improvement. Therefore, there is a need for technologies that can improve core losses and copper losses, and reduce current errors caused by component errors. Utility Model Content

[0003] This invention provides a multi-phase conversion circuit and multi-phase converter with a delta inductor-capacitor Y-type (Δ-Lr&Cr-Y) full bridge architecture, which has better core loss and copper loss, and lower current error for component errors.

[0004] According to a first aspect of this invention, a multi-phase conversion circuit is proposed. The multi-phase conversion circuit includes a primary-side switching circuit. The primary-side switching circuit includes multiple complementary transistor pairs. The multiple complementary transistor pairs are coupled in parallel. The multi-phase conversion circuit also includes a resonant tank coupled to the primary-side switching circuit and includes multiple capacitors, multiple resonant inductors, and multiple transformers. The multi-phase conversion circuit also includes a secondary-side switching circuit coupled to the resonant tank, the secondary-side switching circuit being a full-bridge architecture. Each of the multiple complementary transistor pairs in the primary-side switching circuit includes a complementary first transistor and a complementary second transistor. The first transistor and the second transistor are coupled in series. A node is formed between the first transistor and the second transistor of each of the multiple complementary transistor pairs. The node is coupled to one of the multiple resonant inductors of the resonant tank.

[0005] According to a second aspect of this utility model, a multi-phase converter is proposed. The multi-phase converter includes multiple resonant inductor structures, each of which has an upper inductor cover, a lower inductor cover, an inductor core, and a winding coil. The inductor core is disposed between the upper and lower inductor covers and has a first air gap, with the winding coil surrounding it. The multi-phase converter also includes multiple transformer structures, each of which has an upper transformer cover, a lower transformer cover, a transformer core, a primary winding coil, and a secondary winding coil. The transformer core is disposed between the upper and lower transformer covers and has a second air gap, with the primary and secondary winding coils surrounding it. The multi-phase converter also includes a primary-side switching circuit. The primary-side switching circuit includes multiple complementary transistor pairs coupled in parallel. The multi-phase converter also includes a secondary-side switching circuit coupled to the secondary windings of each of the multiple transformer structures, the secondary-side switching circuit being a full-bridge architecture. Each of the multiple complementary transistor pairs in the primary-side switching circuit includes a complementary first transistor and a second transistor. The first transistor and the second transistor are connected in series. A node is provided between the first transistor and the second transistor of each of the multiple complementary transistor pairs, and the node is coupled to the winding coil of a corresponding member of a resonant inductor structure. The primary-side winding coil of one of the multiple transformer structures is coupled to the winding coil of the resonant inductor structure.

[0006] The foregoing description is not intended to represent every embodiment or aspect of the present invention. Rather, it provides examples of some novel aspects and features of the present invention. The foregoing features and advantages, as well as other features and advantages, will become apparent from the following detailed description of representative embodiments and modes of practice when taken in conjunction with the accompanying drawings and the claims. Other aspects of the present invention will be apparent to those skilled in the art from the detailed description of various embodiments with reference to the accompanying drawings and the brief description provided below.

[0007] To provide a better understanding of the above and other aspects of this utility model, specific embodiments are described below in conjunction with the accompanying drawings: Attached Figure Description

[0008] Figure 1 This is a circuit diagram of an example multi-phase conversion circuit for multiple embodiments of the present invention;

[0009] Figure 2 This is a timing diagram of multiple signals of a multi-phase conversion circuit according to multiple embodiments of the present invention;

[0010] Figure 3AThis is a schematic diagram comparing the resonant inductance error of a triangular inductor-capacitor Y-type full-bridge multi-phase converter and a full-bridge-full-bridge multi-phase converter according to multiple embodiments of the present invention.

[0011] Figure 3B This is a schematic diagram comparing the resonant capacitance error of a triangular inductor-capacitor Y-type full-bridge multiphase converter and a full-bridge-full-bridge multiphase converter according to multiple embodiments of the present invention.

[0012] Figure 3C This is a schematic diagram comparing the resonant inductance and capacitance errors of a triangular inductor-capacitor Y-type full-bridge multi-phase converter and a full-bridge-full-bridge multi-phase converter according to multiple embodiments of this utility model.

[0013] Figure 4 This is a schematic diagram comparing the copper losses of a triangular inductor-capacitor Y-type full-bridge multiphase converter and a full-bridge-full-bridge multiphase converter according to multiple embodiments of the present invention.

[0014] Figure 5 The image shows a side view of the primary resonant inductor structure and transformer structure of a multi-phase converter, which are examples of several embodiments of this utility model.

[0015] Figure 6 This is a perspective view of the primary resonant inductor structure and transformer structure of a multi-phase converter, which are examples of multiple embodiments of this utility model.

[0016] Figure 7 A perspective view and a side view of an integrated inductor and transformer structure for an example of multiple embodiments of this utility model of a multi-phase converter;

[0017] Figure 8 The images show a side view of the integrated inductor and transformer structure of a multi-phase converter, which is an example of multiple embodiments of this utility model, and a schematic diagram of the arrangement of the transformer winding coils.

[0018] In the attached figures, the following labels are used:

[0019] 1000: Multi-phase conversion circuit;

[0020] 100: Primary side switching circuit;

[0021] 200: Secondary side switching circuit;

[0022] 300: Resonant groove;

[0023] 311: Inductor top cover;

[0024] 312: Inductor bottom cover;

[0025] 313: Inductor core;

[0026] 313a, 323a: air gap;

[0027] 314: Wire-wound coil;

[0028] 315: Inductor core post;

[0029] 321: Transformer top cover;

[0030] 322: Transformer lower cover;

[0031] 323: Transformer core column;

[0032] 324a: Primary winding coil;

[0033] 324b: Secondary winding coil;

[0034] 325: Transformer core post;

[0035] 331: One-piece top cover;

[0036] 332: One-piece bottom cover;

[0037] 333: Integrated intermediate layer;

[0038] C out Output capacitor;

[0039] C r C r1_Pri ~C r3_Pri Primary resonant capacitor;

[0040] C r1_Sec ~C r3_Sec Secondary resonant capacitor;

[0041] I P1 First phase current;

[0042] I P2 Second phase current;

[0043] I P3 Third-phase current;

[0044] I Pri Primary current;

[0045] I Lm Primary inductor current;

[0046] I Sec Secondary current;

[0047] L m :Magnetic excitation inductance;

[0048] L r ,L r1~L r3 : Primary resonant inductor;

[0049] n1, n2, n3: Nodes;

[0050] Q A_P1 ~Q A_P3 First transistor;

[0051] Q B_P1 ~Q B_P3 Second transistor;

[0052] Q C_P1 ~Q F_P3 :transistor;

[0053] R out Output resistance;

[0054] T r ,T r1 ~T r3 :transformer;

[0055] t d Dead time;

[0056] V BUS Input voltage;

[0057] V gs1 ~V gs6 Gate voltage. Detailed Implementation

[0058] The following details various embodiments of this utility model, illustrated in the accompanying drawings. Besides these detailed descriptions, this utility model can be widely implemented in other embodiments. Any easy substitutions, modifications, or equivalent changes to the described embodiments are included within the scope of this utility model and are subject to its patent scope. In the description of this specification, many specific details and implementation examples are provided to give the reader a more complete understanding of this utility model; however, these specific details and implementation examples should not be considered as limitations of this utility model. Furthermore, well-known steps or elements are not described in the details to avoid unnecessary limitations on this utility model. In the drawings, the same or similar element symbols are used to represent the same or similar elements.

[0059] Figure 1 This is a circuit diagram of an example multi-phase conversion circuit 1000, illustrating multiple embodiments of the present invention. Figure 1In the example, the multi-phase conversion circuit 1000 is shown as a three-phase circuit for ease of explanation, but this is not intended to be a limitation. The multi-phase conversion circuit 1000 includes a primary-side switching circuit 100, a resonant slot 300, and a secondary-side switching circuit 200. The resonant slot 300 is coupled to the primary-side switching circuit 100 and the secondary-side switching circuit 200.

[0060] The primary-side switching circuit 100 includes multiple transistors (first transistor Q). A_P1 ~First transistor Q A_P3 and the second transistor Q B_P1 ~Second transistor Q B_P3 () as a switch. The first transistor Q A_P1 With the second transistor Q B_P1 Series connection forms a complementary pair of transistors. Similarly, the first transistor Q... A_P2 With the second transistor Q B_P2 and the first transistor Q A_P3 With the second transistor Q B_P3 These are connected in series to form two other sets of complementary transistor pairs. For example... Figure 1 As shown, these transistors are connected in parallel in complementary pairs (first transistor Q). A_P1 With the second transistor Q B_P1 First transistor Q A_P2 With the second transistor Q B_P2 and the first transistor Q A_P3 With the second transistor Q B_P3 (Parallel connection).

[0061] The resonant slot 300 includes multiple primary-side resonant capacitors (primary-side resonant capacitor C). r1_Pri ~ Primary resonant capacitor C r3_Pri ), multiple primary resonant inductors (primary resonant inductor L) r3 ~ Primary resonant inductor L r3 ) and multiple transformers (transformer T) r1 ~Transformer T r3 Each primary resonant inductor (primary resonant inductor L) r3 ~ Primary resonant inductor L r3 ) are connected in series to each transformer (transformer T) r1 ~Transformer T r3 ).

[0062] The secondary-side switching circuit 200 includes multiple transistors (transistor Q). C_P1 ~ Transistor Q F_P3 As a switch, and including multiple secondary resonant capacitors (secondary resonant capacitor C) r1_Sec ~Secondary resonant capacitor C r3_Sec Output capacitor C outand output resistance R out The secondary-side switching circuit 200 is a full-bridge architecture, such as... Figure 1 As shown.

[0063] In the primary-side switching circuit 100, nodes (nodes n1 to n3) are formed between each first transistor and each second transistor in the transistor complementary pair. For example, the first transistor Q forming the transistor complementary pair... A_P1 With the second transistor Q B_P1 There is a node n1 between them. Each node (nodes n1 to n3) is coupled to one of the multiple resonant inductors of the resonant tank 300. For example, node n1 is coupled to the resonant inductor L. r1 .

[0064] Figure 2 This is a timing diagram of multiple signals of a multi-phase conversion circuit 1000 according to multiple embodiments of the present invention. Also referencing... Figure 1 and Figure 2 When the primary-side switching circuit 100 is coupled to the input voltage V BUS At the same time, the different phase inductor currents (first phase current I) at nodes of different phases (node ​​n1 corresponds to the first phase, node n2 corresponds to the second phase, and node n3 corresponds to the third phase) are as follows: P1 Second phase current I P2 and the third phase current I P3 Between them, it can be designed to have a 120-degree phase difference, such as Figure 2 As shown in Figure (a), the primary inductor current I of the multi-phase conversion circuit 1000 is... Lm Primary side current I Pri and secondary current I Sec Having such Figure 2 The waveform shown in Figure (b) is illustrated. To achieve this effect, the transistors, acting as switches, can be controlled via a controller coupled to the control terminals (e.g., the gates of the first transistors) and the control terminals (e.g., the gates of the second transistors). Figure 2 In the example, the controller provides gate voltage V. gs1 ~Gate voltage V gs3 To the first transistor Q A_P1 ~First transistor Q A_P3 and respectively provide gate voltage V gs4 ~Gate voltage V gs6 To the first transistor Q B_P1 ~First transistor Q B_P3 This ensures that the first transistors (first transistor Q) are connected. A_P1 ~First transistor Q A_P3There is a 120-degree phase difference between each second transistor (Q). B_P1 ~Second transistor Q B_P3 There is a 120-degree phase difference between each of the first and second transistors (e.g., the first transistor Q). A_P1 With the second transistor Q B_P1 There is a 180-degree phase difference between them, such as Figure 2 As shown in Figure (c), to prevent the first and second transistors in the transistor complement from being turned on simultaneously, the controller can set a dead time t between the switching timings of the first and second transistors based on the parasitic capacitances of the primary-side switching circuit 100 and the secondary-side switching circuit 200 and the magnetizing inductance of the transformer. d ,like Figure 2 As shown in Figure (d), when the magnetizing inductance is small, the source-drain voltage of the switch in the primary-side switching circuit 100 can be quickly discharged to 0V, so the dead time td can be set to be small. When the magnetizing inductance is large, a longer dead time td is required to allow the source-drain voltage of the switch in the primary-side switching circuit 100 to discharge to 0V, thus achieving zero-voltage switch (ZVS) functionality.

[0065] Table 1 below shows the design data for the electrical specifications of a multi-phase converter with a full-bridge architecture and a multi-phase converter with a delta-inductor-capacitor Y-type full-bridge architecture under the same ZVS current conditions. Table 2 shows the core specifications of the transformers for the multi-phase converters with a full-bridge architecture and a multi-phase converter with a delta-inductor-capacitor Y-type full-bridge architecture.

[0066] Table 1:

[0067]

[0068]

[0069] Table 2:

[0070] Core Specifications Full-Full (Δ-Lr&Cr-Y)–(Full Bridge) Ae 174.04mm2 174.04mm2 Material KF9 KF9 <![CDATA[Maximum magnetic flux density B max (Hypothesis)]]> 0.25T 0.25T Primary side winding coil 0.1 * 500 shares 0.1 * 500 shares Secondary winding coil 0.6mm copper sheet 0.6mm copper sheet Circle ratio 16:2 16:2 air gap 0.38mm 0.12mm

[0071] Based on the design data in Tables 1 and 2 above, Table 3 below compares the performance of a full-bridge-to-full-bridge ((Full Bridge)–(Full Bridge)) three-phase converter and a delta-inductor-capacitor Y-type-full-bridge ((Δ-Lr&Cr-Y)–(FullBridge)) three-phase converter in converting from 500V to 50V at 10kW. Table 3 shows that the (Δ-Lr&Cr-Y)–(Full Bridge) architecture has significantly higher RMS values ​​(A) for both the primary-side switching current and the secondary-side transformer current than the (Full Bridge)–(Full Bridge) architecture. Therefore, the larger air gap in the (Full Bridge)–(Full Bridge) architecture affects copper wire losses, resulting in higher losses for the (Full Bridge)–(Full Bridge) architecture compared to the (Δ-Lr&Cr-Y)–(Full Bridge) architecture.

[0072] Table 3:

[0073]

[0074] Figure 3A This diagram illustrates a comparison of the resonant inductance error (first case) between a triangular inductor-capacitor Y-type full-bridge (Δ-Lr&Cr-Y) multi-phase converter and a full-bridge-full-bridge (Full Bridge) multi-phase converter according to multiple embodiments of this invention. Figure 3B This diagram illustrates a comparison of the resonant capacitance error (second example) between a triangular inductor-capacitor Y-type full-bridge (Δ-Lr&Cr-Y) multi-phase converter and a full-bridge-full-bridge (Full Bridge) multi-phase converter according to multiple embodiments of this invention. Figure 3C This is a schematic diagram comparing the resonant inductance and capacitance errors (third case) of a triangular inductor-capacitor Y-type full-bridge (Δ-Lr&Cr-Y) multi-phase converter and a full-bridge-full-bridge (Full Bridge) multi-phase converter according to multiple embodiments of this utility model. Figure 3A In the first case, a resonant inductor (resonant inductor L) was used. r1 ~Resonant inductor L r3 Taking an error of ±10% as an example (L) r1 =1.1*L r1 and L r3 =0.9*L r1).At Figure 3B In the second case, the resonant capacitor (primary resonant capacitor C) is used. r1_Pri ~ Primary resonant capacitor C r3_Pri Taking an error of ±10% as an example (C) r2_Pri =1.1*C r1_Pri and C r3_Pri =0.9*C r1_Pri ).At Figure 3C In the third case, the resonant capacitor (primary resonant capacitor C) is used simultaneously. r1_Pri ~ Primary resonant capacitor C r3_Pri The error is ±10% (C) r2_Pri =1.1*C r1_Pri and C r3_Pri =0.9*C r1_Pri ) and resonant inductance (resonant inductance L) r1 ~Resonant inductor L r3 The error is ±10% (L) r1 =1.1*L r1 and L r3 =0.9*L r1 For example, based on the design data in Tables 1 and 2 above and the error comparison in Table 4 below, it can be seen that in the first case, the second case, and the third case, compared with the full-bridge-full-bridge architecture, the triangular inductor-capacitor Y-type-full-bridge ((Δ-Lr&Cr-Y)–(Full Bridge)) architecture in the various embodiments of this utility model has smaller current differences caused by component errors (resonant inductor error, resonant capacitor error, or both).

[0075] Table 4:

[0076]

[0077] Figure 4 The transformer T is used in multiple embodiments of the present invention for the triangular inductor-capacitor Y-type full-bridge (Δ-Lr&Cr-Y)–(Full Bridge) multi-phase conversion circuit and the full-bridge to full-bridge (Full Bridge)–(Full Bridge) multi-phase converter. r A schematic diagram comparing core loss and copper loss. Based on... Figure 4 As shown, the transformer T of the (Δ-Lr&Cr-Y)–(Full Bridge) architecture r Because Bmax is relatively small, the core loss is significantly smaller for the same core size. Therefore, the total loss is comparable to that of the (Full Bridge) – (Full Bridge) transformer T. rIn comparison, total loss can be reduced by approximately 41.56%.

[0078] As can be seen from the above comparisons, the triangular inductor-capacitor Y-type full-bridge ((Δ-Lr&Cr-Y)–(Full Bridge)) architecture provided in the various embodiments of this utility model has lower core loss and total loss, and higher tolerance for current error caused by component error, compared with the existing full-bridge ((Full Bridge)–(Full Bridge)) architecture.

[0079] Figure 5 and Figure 6 Examples of multiple embodiments of this utility model include the primary resonant inductor L of a multi-phase converter. r Structure and Transformer T r Side view and perspective view of the structure. For example... Figure 5 and Figure 6 As shown, the primary resonant inductor L r (For example Figure 1 The primary resonant inductor L r1 To the primary resonant inductor L r3 The transformer may have an upper inductor cover 311, a lower inductor cover 312, an inductor core 313, and a wound coil 314. The inductor core 313 is disposed between the upper inductor cover 311 and the lower inductor cover 312, and the inductor core 313 has an air gap 313a (i.e., a first air gap). The wound coil 314 is arranged around the inductor core 313. (Transformer structure T) r (For example Figure 1 Transformer T r1 To transformer T r3 The transformer may have an upper cover 321, a lower cover 322, a core 323, a primary winding coil 324a, and a secondary winding coil 324b. The core 323 is disposed between the upper cover 321 and the lower cover 322, and has an air gap 323a (i.e., a second air gap). The primary winding coil 324a and the secondary winding coil are arranged around the core 324b. The secondary winding coil around 324b can be coupled to the secondary switching circuit of a multi-phase converter (e.g.,...). Figure 1 The secondary-side switching circuit 200), while the primary-side wound coil 324a can be coupled to the primary-side resonant inductor L. rThe winding coil 314. In some embodiments, the primary winding coil 324a and the secondary winding coil disposed on the transformer core 323 are wound clockwise around 324b, and the winding coil 314 disposed on the inductor core 313 is wound clockwise. In some embodiments, the primary winding coil 324a and the secondary winding coil disposed on the transformer core 323 are wound counterclockwise around 324b, and the winding coil 314 disposed on the inductor core 313 is wound counterclockwise.

[0080] Figure 7 The figures show a perspective view and a side view of an integrated inductor and transformer structure 330 for multiple embodiments of the present invention. Figure 7 The multi-phase converter will be explained using a three-phase converter as an example, that is... Figure 7 The integrated inductor and transformer structure 330 has three primary-side resonant inductors L r and three transformers T r For example Figure 7 As shown, the integrated inductor and transformer structure 330 has an integrated top cover 331, which can be regarded as... Figure 6 The three primary resonant inductors L r The structure consists of three inductor covers 311. The integrated inductor and transformer structure 330 has an integrated intermediate layer 333, which can be considered as... Figure 6 The three primary resonant inductors L r The structure includes multiple inductor covers 312 and three transformers T. r The structure is a combination of multiple transformer top covers 321. The integrated inductor and transformer structure 330 has an integrated bottom cover 332, which can be regarded as... Figure 6 The three transformers T r The structure consists of three transformer lower covers 322. In the upper integrated inductor structure (between the integrated upper cover 331 and the integrated intermediate layer 333), in addition to the inductor core posts 313 and air gaps 313a corresponding to the three inductors, an inductor center post 315 is also located at the geometric center of the integrated upper cover 331 and the integrated intermediate layer 333. The inductor center post 315 does not have an air gap, and the inductor center post 315 and each inductor core post 313 are equidistant from each other, such as... Figure 7As shown. In some embodiments, the cross-sectional area of ​​the inductor core post 315 is the same as that of each inductor core post 313, and the air gaps 313a of each inductor core post 313 are all equal. Similarly, in the lower integrated transformer structure (between the integrated intermediate layer 333 and the integrated lower cover 332), in addition to the transformers 323 corresponding to the three transformers and the air gaps 323a, a transformer core post 325 is also provided at the geometric center between the integrated intermediate layer 333 and the integrated lower cover 332. The transformer core post 325 does not have an air gap, and the transformer core post 325 and each transformer core post 323 are equidistant from each other, such as... Figure 7 As shown. In some embodiments, the cross-sectional area of ​​the transformer core column 325 and each transformer core column 323 is the same, and the air gaps 323a of each transformer core column 323 are all equal. In some embodiments, the air gaps 323a of each transformer core column 323 are smaller than the air gaps 313a of each inductor core column 313. In some embodiments, the inductor core column 315, each inductor core column 313, the transformer core column 325, and each transformer core column 323 are not coupled to each other. In some embodiments, the primary winding coils 324a and each secondary winding coil disposed on each transformer core column 323 are wound clockwise around 324b, and the winding coils 314 disposed on each inductor core column 313 are wound clockwise. In some embodiments, the primary winding coil 324a and the secondary winding coil disposed on each transformer core 323 are wound counterclockwise around 324b, and the winding coil 314 disposed on each inductor core 313 is wound counterclockwise.

[0081] Figure 8 This is a side view of the integrated inductor and transformer structure 330 of a multi-phase converter, an example of multiple embodiments of the present invention, and a schematic diagram of the arrangement of the transformer winding coils (primary winding coil 324a and each secondary winding coil surrounding 324b). Figure 8As shown, the primary winding coils 324a and secondary winding coils 324b on each transformer core column 323 are arranged alternately on both sides of the axis of symmetry (on the axis of symmetry, two primary winding coils 324a are adjacent, and there is no secondary winding coil 324b in between). In this example, the circuit under the three-phase converter architecture is prone to uneven current in each phase due to the inconsistent size of stray components on the line. Therefore, by using the above-mentioned "symmetrical winding method", in which the primary winding coils 324a and secondary winding coils 324b are arranged alternately, the loss caused by AC resistance can be reduced. In some embodiments, the air gap (air gap 313a of inductor core 313 or air gap 323a of transformer core 323) is located in the middle of each inductor core 313 and each transformer core 323. In order to reduce the impact of the air gap, Litz Wire coils can be used in the coils near the air gap (wound coils 314 on each inductor core 313 or primary winding coils 324a or secondary winding coils 324b on each transformer core 323) to significantly reduce the AC current loss caused by the air gap to the coils.

[0082] The switching elements (switching groups or switches) described herein, such as PMOS and NMOS transistors, can be interchanged, arbitrarily combined, or their types changed to achieve the same function, and are not limited to the transistor types and combinations described in the various embodiments of this utility model.

[0083] Various embodiments are described with reference to the accompanying drawings, in which all figures use the same reference numerals to denote similar or equivalent elements. The drawings are not necessarily drawn to scale and are provided only to illustrate aspects and features of the invention. Numerous specific details, relationships, and methods are set forth to provide a comprehensive understanding of certain aspects and features of the invention, although those skilled in the art will recognize that these aspects and features can be implemented without one or more of these specific details, relationships, or methods. In some cases, well-known structures or operations are not shown in detail for illustrative purposes. The various embodiments disclosed herein are not necessarily limited to the order of the described actions or events, as some actions may occur in a different order and / or simultaneously with other actions or events. Furthermore, not all actions or events in the figures are necessary to realize certain aspects and features of the invention.

[0084] Although the present invention has been described and illustrated with respect to one or more embodiments, other skilled in the art will recognize or understand equivalent changes and modifications upon reading and understanding this specification and the accompanying drawings. Furthermore, while a particular feature of the present invention may be disclosed only for one of several embodiments, this feature may be combined with one or more other features of other embodiments, as these features may be desirable and advantageous for any given or particular application.

[0085] While various embodiments of the present invention have been described above, it should be understood that they are presented by way of example only and not as limitation. Many changes may be made to the disclosed embodiments based on this disclosure without departing from the spirit or scope of the present invention. Therefore, the breadth and scope of the present invention should not be limited to any of the foregoing embodiments. Rather, the scope of the present invention should be defined according to the appended claims and their equivalents.

Claims

1. A multiphase conversion circuit, characterized by, Comprising: a primary side switching circuit comprising a plurality of transistor complementary pairs coupled in parallel; a resonant tank coupled to the primary side switching circuit, the resonant tank comprising a plurality of capacitors, a plurality of resonant inductors, and a plurality of transformers; and a secondary side switching circuit coupled to the resonant tank, the secondary side switching circuit being a full-bridge configuration, wherein each of the plurality of transistor complementary pairs of the primary side switching circuit comprises a first transistor and a second transistor coupled in series, the first transistor and the second transistor being complementary to each other, wherein each of the plurality of transistor complementary pairs has a node between the first transistor and the second transistor, the node being coupled to a corresponding one of the plurality of resonant inductors of the resonant tank.

2. The multiphase conversion circuit of claim 1, wherein, each of the plurality of resonant inductors in the resonant tank is coupled in series to a corresponding one of the plurality of capacitors and a corresponding one of the plurality of transformers.

3. The multiphase conversion circuit of claim 1, wherein, a first control terminal of the first transistor and a second control terminal of the second transistor of each of the plurality of transistor complementary pairs are coupled to a controller, wherein the controller causes a 120-degree phase difference between each of the first transistors of the plurality of transistor complementary pairs, a 120-degree phase difference between each of the second transistors, and a 180-degree phase difference between the first transistor and the second transistor of each of the plurality of transistor complementary pairs.

4. The multiphase conversion circuit of claim 3, wherein, when the primary side switching circuit is coupled to an input voltage, a 120-degree phase difference between a plurality of inductor currents of each of the nodes of the plurality of transistor complementary pairs, wherein each of the plurality of inductor currents is from each of the nodes to a corresponding one of the plurality of resonant inductors coupled to each of the nodes.

5. The multiphase conversion circuit of claim 3, wherein, the controller sets a dead time between switching timings of the first transistor and the second transistor of a corresponding one of the plurality of transistor complementary pairs according to a parasitic capacitance of the primary side switching circuit and the secondary side switching circuit and an excitation inductance of the plurality of transformers to prevent the first transistor and the second transistor of the corresponding one of the plurality of transistor complementary pairs from being simultaneously turned on.

6. A multiphase converter characterized by, Comprising: a plurality of resonant inductor structures, each of the plurality of resonant inductor structures having an inductor upper cover, an inductor lower cover, an inductor core column, and a winding coil, wherein the inductor core column is disposed between the inductor upper cover and the inductor lower cover, and the inductor core column has a first air gap, and the winding coil is disposed around the inductor core column; a plurality of transformer structures, each of the plurality of transformer structures having a transformer upper cover, a transformer lower cover, a transformer core column, a primary side winding coil, and a secondary side winding coil, wherein the transformer core column is disposed between the transformer upper cover and the transformer lower cover, and the transformer core column has a second air gap, and the primary side winding coil and the secondary side winding coil are disposed around the transformer core column; a primary side switching circuit comprising a plurality of transistor complementary pairs coupled in parallel; and a secondary side switching circuit coupled to the resonant tank, the secondary side switching circuit being a full-bridge configuration, wherein each of the plurality of transistor complementary pairs of the primary side switching circuit comprises a first transistor and a second transistor coupled in series, the first transistor and the second transistor being complementary to each other, wherein each of the plurality of transistor complementary pairs has a node between the first transistor and the second transistor, the node being coupled to a corresponding one of the plurality of resonant inductors of the resonant tank. each of the plurality of resonant inductors in the resonant tank is coupled in series to a corresponding one of the plurality of capacitors and a corresponding one of the plurality of transformers. a first control terminal of the first transistor and a second control terminal of the second transistor of each of the plurality of transistor complementary pairs are coupled to a controller, wherein the controller causes a 120-degree phase difference between each of the first transistors of the plurality of transistor complementary pairs, a 120-degree phase difference between each of the second transistors, and a 180-degree phase difference between the first transistor and the second transistor of each of the plurality of transistor complementary pairs. when the primary side switching circuit is coupled to an input voltage, a 120-degree phase difference between a plurality of inductor currents of each of the nodes of the plurality of transistor complementary pairs, wherein each of the plurality of inductor currents is from each of the nodes to a corresponding one of the plurality of resonant inductors coupled to each of the nodes. the controller sets a dead time between switching timings of the first transistor and the second transistor of a corresponding one of the plurality of transistor complementary pairs according to a parasitic capacitance of the primary side switching circuit and the secondary side switching circuit and an excitation inductance of the plurality of transformers to prevent the first transistor and the second transistor of the corresponding one of the plurality of transistor complementary pairs from being simultaneously turned on. A primary side switch circuit is coupled to the primary winding of each of the plurality of transformer structures, wherein each of the plurality of complementary transistor pairs of the primary side switch circuit comprises a first transistor and a second transistor coupled in series, wherein each of the plurality of complementary transistor pairs has a node between the first transistor and the second transistor, the node being coupled to the winding of a corresponding one of the plurality of resonant inductors, wherein the primary winding of a corresponding one of the plurality of transformer structures is coupled to the winding of a corresponding one of the plurality of resonant inductors.

7. The multiphase converter of claim 6, wherein, each of the plurality of resonant inductors has a first air gap between the upper inductor core and the lower inductor core, wherein the plurality of resonant inductors has a resonant inductor center core disposed between the upper inductor core and the lower inductor core and at a geometric center thereof, wherein the resonant inductor center core does not have the first air gap, and the resonant inductor center core and each of the inductor cores are equidistant from each other, wherein each of the plurality of transformer structures has a transformer center core disposed between the upper transformer core and the lower transformer core and at a geometric center thereof, 8. The multiphase converter of claim 6, wherein, wherein the transformer center core does not have the second air gap, and the transformer center core and each of the transformer cores are equidistant from each other. a first control terminal of the first transistor and a second control terminal of the second transistor of each of the plurality of complementary transistor pairs are coupled to a controller, 9. The multiphase converter of claim 8, wherein, wherein the controller causes each of the first transistors of the plurality of complementary transistor pairs to have a 120 degree phase difference, each of the second transistors to have a 120 degree phase difference, and each of the first transistors and the second transistors of each of the plurality of complementary transistor pairs to have a 180 degree phase difference. when the primary side switch circuit is coupled to an input voltage, a plurality of inductor currents of each of the nodes of the plurality of complementary transistor pairs have a 120 degree phase difference, 10. The multiphase converter of claim 8, wherein, wherein each of the plurality of inductor currents is from each of the nodes to a corresponding one of the plurality of resonant inductors coupled to each of the nodes. the controller sets a dead time between switching timings of the first transistor and the second transistor of a corresponding one of the plurality of complementary transistor pairs to prevent the first transistor and the second transistor of the corresponding one of the plurality of complementary transistor pairs from being simultaneously turned on based on a parasitic capacitance of the primary side switch circuit and the secondary side switch circuit and an excitation inductance of the plurality of transformers.

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