A rectifier assembly and a transformer-isolated DC / DC converter

Abstract

This application discloses a rectifier assembly and a transformer-isolated DC / DC converter. The rectifier assembly includes: a rectifier board, comprising a circuit board and a secondary-side assembly disposed on the circuit board. The secondary-side assembly includes a first connection terminal, a second connection terminal, a rectifier module, and a first filter module. The first and second connection terminals are respectively connected to the two input terminals of the rectifier module, and the first filter module is connected to the output terminal of the rectifier module. The transformer module includes an assembly frame and a transformer. The assembly frame includes a first insulating plate and a second insulating plate arranged in an L-shape. The second insulating plate is fixed to the circuit board, and the transformer is fixed to the inner side of the assembly frame. The two ends of the primary winding of the transformer are led out from the first insulating plate, and the two ends of the secondary winding of the transformer are led out from the second insulating plate. The two ends of the secondary winding are respectively connected to the first and second connection terminals. This rectifier assembly can shorten the current path of the transformer secondary winding and reduce the area of ​​the high-frequency loop.

Description

Technical Field

[0001] This application relates to the field of switching power supply technology, and in particular to a rectifier assembly and a transformer-isolated DC / DC converter. Background Technology

[0002] High power density is a development trend in switching power supplies. Increasing the switching frequency can reduce the size of passive components and is an effective measure to improve power density. However, increasing the switching frequency also places higher demands on the design of high-frequency loops. For switching power supplies with transformers and rectifier circuits in their main power topology, the transformer secondary winding, rectifier module, and filter capacitor constitute a high-frequency loop. The high-frequency loop area is large, which generates additional AC losses, leading to increased power supply heat generation, reduced efficiency, and severe electromagnetic interference, which is detrimental to the EMC performance of the power supply product. Utility Model Content

[0003] This application provides a rectifier component and a transformer-isolated DC / DC converter. The rectifier component can shorten the current path of the transformer secondary winding, thereby reducing the area of ​​the high-frequency loop.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A rectifier component, comprising;

[0006] A rectifier board, comprising a circuit board and a secondary side assembly disposed on the circuit board, the secondary side assembly comprising a first connection terminal, a second connection terminal, a rectifier module and a first filter module, the first connection terminal and the second connection terminal being respectively connected to the two input terminals of the rectifier module, and the first filter module being connected to the output terminal of the rectifier module;

[0007] A transformer module includes an assembly frame and a transformer. The assembly frame includes a first insulating plate and a second insulating plate arranged in an L-shape. The extension surface of the first insulating plate is perpendicular to the extension surface of the second insulating plate. The second insulating plate is parallel to the circuit board and fixed to the circuit board. The transformer is fixed to the inner side of the assembly frame. The two ends of the primary winding of the transformer are led out from the first insulating plate, and the two ends of the secondary winding of the transformer are led out from the second insulating plate. The two ends of the secondary winding of the transformer are respectively connected to the first connecting terminal and the second connecting terminal.

[0008] Optionally, the rectifier board includes at least two sets of secondary side components, and the output terminals of the rectifier modules of the at least two sets of secondary side components are connected in parallel;

[0009] The transformer module includes at least two transformers, which correspond one-to-one with the at least two sets of secondary components. The primary windings of the at least two transformers are connected in series, and the two ends of the secondary winding of each transformer are respectively connected to the first connection terminal and the second connection terminal in the corresponding secondary component.

[0010] Optionally, in the secondary side assembly, the rectifier module and the first filter module are arranged between the first connection terminal and the second connection terminal.

[0011] Optionally, the rectifier module is a full-bridge rectifier circuit, and the two ends of the first filter module are connected to the two output terminals of the rectifier module.

[0012] Optionally, the rectifier module includes a first rectifier tube, a second rectifier tube, a third rectifier tube, and a fourth rectifier tube;

[0013] The input terminal of the first rectifier is connected to the output terminal of the second rectifier, the output terminal of the first rectifier is connected to the output terminal of the third rectifier, the input terminal of the third rectifier is connected to the output terminal of the fourth rectifier, and the input terminal of the fourth rectifier is connected to the input terminal of the second rectifier.

[0014] The first connection terminal is connected to the input terminal of the first rectifier tube, and the second connection terminal is connected to the output terminal of the fourth rectifier tube;

[0015] The first end of the first filter module is connected to the output end of the first rectifier tube, and the second end of the first filter module is connected to the input end of the fourth rectifier tube.

[0016] The first connecting terminal, the first rectifier tube, the third rectifier tube, and the second connecting terminal are arranged at intervals along the first direction. The second rectifier tube is disposed on one side of the first rectifier tube along the second direction. The fourth rectifier tube is disposed on one side of the third rectifier tube along the second direction. The second direction is perpendicular to the first direction.

[0017] The first rectifier tube, the second rectifier tube, the third rectifier tube, and the fourth rectifier tube are arranged around the first filter module.

[0018] Optionally, the rectifier module is a full-wave rectifier circuit;

[0019] The secondary side component also includes a third connection terminal, the first end of the first filter module is connected to the output end of the full-wave rectifier circuit, and the second end of the first filter module is connected to the third connection terminal;

[0020] The secondary winding of the transformer also includes a center tap, which is led out from the second insulating plate and connected to the third connection terminal.

[0021] Optionally, the rectifier module includes a fifth rectifier tube and a sixth rectifier tube. The input terminal of the fifth rectifier tube is connected to the first connection terminal, and the output terminal of the fifth rectifier tube is connected to the first terminal of the first filter module. The input terminal of the sixth rectifier tube is connected to the second connection terminal, and the output terminal of the sixth rectifier tube is connected to the output terminal of the fifth rectifier tube.

[0022] The first connection terminal, the fifth rectifier tube, the sixth rectifier tube, and the second connection terminal are arranged along a first direction. The first filter module is disposed on one side of the rectifier module along a second direction, and the third connection terminal is disposed on the side of the first filter module away from the rectifier module along the second direction.

[0023] Optionally, it also includes a second filtering module, the two ends of which are respectively connected to the two output terminals of the rectifier module in the secondary side component.

[0024] Optionally, it also includes two busbars that are insulated from each other. One busbar is connected to one output terminal of the rectifier module in the secondary side assembly, and the other busbar is connected to the other output terminal of the rectifier module in the secondary side assembly. The two busbars are located between the rectifier plate and the second insulating plate of the transformer module, and the two busbars are stacked along the arrangement direction of the rectifier plate and the transformer module. The two busbars are insulated from the transformer module.

[0025] The two ends of the second filtering module are respectively connected to the two busbars.

[0026] Optionally, insulating paper is provided between the two busbars to insulate them from each other.

[0027] Optionally, of the two busbars, one busbar has a first plug-in terminal and the other busbar has a second plug-in terminal;

[0028] The two busbars are respectively plugged into the rectifier board via the first plug-in terminal and the second plug-in terminal, so that the busbars are connected to the rectifier module on the rectifier board.

[0029] Optionally, the busbar has an edge with a clearance notch opposite to the end of the secondary winding of the transformer, so that the end of the secondary winding of the transformer does not contact the busbar.

[0030] Optionally, one of the busbars includes a first part, a connecting part, and a second part connected in sequence;

[0031] The first part is connected to the output end of the rectifier module in the secondary side assembly, and the second part is connected to the end of the filter module;

[0032] It also includes a high-frequency magnetic ring, which is fitted onto the connection portion to form a differential-mode inductor.

[0033] This application also provides a transformer-isolated DC / DC converter, including any of the rectifier components provided by the above-described technical solutions.

[0034] This application provides a rectifier assembly and a transformer-isolated DC / DC converter. The rectifier assembly includes a rectifier board and a transformer module. The rectifier board is provided with a first connection terminal, a second connection terminal, a rectifier module, and a first filter module. The transformer module includes an assembly frame and a transformer. The assembly frame includes a first insulating plate and a second insulating plate arranged in an L-shape. The second insulating plate is fixed to the rectifier board. The two ends of the primary winding of the transformer are led out from the first insulating plate, and the two ends of the secondary winding of the transformer are led out from the second insulating plate. The ends of the primary winding and the ends of the secondary winding of the transformer are led out from different sides of the transformer module. Thus, the two ends of the primary winding of the transformer can be easily connected to the main power board, and the two ends of the secondary winding of the transformer can be directly connected to the first connection terminal and the second connection terminal on the rectifier board. The secondary winding of the transformer, the rectifier module, and the first filter module form a high-frequency loop with a compact structure. The current path of the secondary winding of the transformer can be directly between the transformer and the rectifier board, without needing to cross the main power board and then the rectifier board, which can shorten the current path of the secondary winding of the transformer and thus reduce the area of ​​the high-frequency loop. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the circuit structure of a transformer-isolated DC / DC converter in related technologies;

[0036] Figure 2 This is a schematic diagram of the state of the rectifier board in related technologies;

[0037] Figure 3 This is a schematic diagram of the state of the rectifier board in related technologies;

[0038] Figure 4 This is a schematic diagram of the structure of a rectifier component provided in an embodiment of this application;

[0039] Figure 5 This is a schematic diagram of the structure of a rectifier plate provided in an embodiment of this application;

[0040] Figure 6 An exploded view of a transformer module provided in an embodiment of this application;

[0041] Figure 7A circuit connection diagram of a rectifier component provided for an embodiment of this application;

[0042] Figure 8 A circuit connection diagram of another rectifier component provided in an embodiment of this application;

[0043] Figure 9 A circuit state diagram of a rectifier component provided for an embodiment of this application;

[0044] Figure 10 This is a schematic diagram of the state of a rectifier board provided in an embodiment of this application;

[0045] Figure 11 A schematic diagram of the circuit state of another rectifier component provided in an embodiment of this application;

[0046] Figure 12 This is a schematic diagram of another rectifier board provided in an embodiment of this application;

[0047] Figure 13 A circuit connection diagram of another rectifier component provided in an embodiment of this application;

[0048] Figure 14 This is a schematic diagram of another rectifier board provided in an embodiment of this application;

[0049] Figure 15 This is a schematic diagram of another rectifier board provided in an embodiment of this application;

[0050] Figure 16 An exploded view of a rectifier assembly provided in an embodiment of this application;

[0051] Figure 17 An exploded view of another rectifier component provided in an embodiment of this application;

[0052] Figure 18 An exploded view of another rectifier component provided in an embodiment of this application;

[0053] Figure 19 This is a schematic diagram of another rectifier component provided in an embodiment of this application;

[0054] Figure 20 A schematic diagram of a transformer-isolated DC / DC converter provided in this application embodiment;

[0055] Figure 21 This is a schematic diagram of the circuit structure of a transformer-isolated DC / DC converter provided in an embodiment of this application.

[0056] icon:

[0057] 1-Rectifier board; 11-Circuit board; 12-Secondary side assembly; 121-First connection terminal; 122-Second connection terminal; 123-Rectifier module; 124-First filter module; 125-Third connection terminal; 2-Transformer module; 21-Assembly frame; 211-First insulating plate; 2111-First lead-out hole; 212-Second insulating plate; 2121-Second lead-out hole; T-Transformer; 3-Positive busbar; 31-First part; 32-Second part; 33-Connecting part; 34-First plug-in terminal; 4-Negative busbar; 41-Second plug-in terminal; 5-Second filter module; 6-High frequency magnetic ring. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] In related technologies, a circuit diagram of a transformer-isolated DC / DC converter can be shown as follows: Figure 1 As shown. It includes a rectifier assembly A', which comprises a first transformer T1' and a second transformer T2', a rectifier module (first rectifier diodes D1' to the eighth rectifier diode D8'), a first filter capacitor C1', a second filter capacitor C2', a third filter capacitor C3', and a differential-mode inductor L1'. The primary winding of the first transformer T1' is NP1', and the secondary winding is NS1'. The primary winding of the second transformer T2' is NP2', and the secondary winding is NS2'. The primary windings NP1' and NP2' of the first transformer T1' and the second transformer T2' are connected in series. The secondary windings NS1' and NS2' of the first transformer T1' are connected in parallel after passing through the rectifier module.

[0060] The primary and secondary windings of the first transformer T1' and the second transformer T2' are both bottom-out. If the secondary winding is bottom-out, then the first transformer T1' and the second transformer T2' need to be soldered onto the main power board of the power supply product. The differential mode inductor L1' and the third filter capacitor C3' can also be placed on the main power board. The rectifier module (first rectifier tube D1' to eighth rectifier tube D8)', the first filter capacitor C1', and the second filter capacitor C2' can be placed on the rectifier board. To form a power circuit loop, the rectifier board needs to be soldered onto the main power board. The extension surface of the rectifier board can be perpendicular to the extension surface of the main power board. The current path of the secondary winding of the transformer is: transformer—main power board—rectifier board. Figure 2 and Figure 3The diagram shown is a schematic of the high-frequency loop path formed by the first transformer T1, the first rectifier tube D1', the second rectifier tube D2', the third rectifier tube D3', the fourth rectifier tube D4', and the first filter capacitor C1'. Figure 2 A high-frequency loop path for a positive half-cycle of a high-frequency period ( Figure 2 A schematic diagram of the path indicated by the middle arrow. Figure 3 A high-frequency loop path for the negative half-cycle of a high-frequency period ( Figure 3 A diagram showing the path indicated by the middle arrow. Because... Figure 2 and Figure 3 The path of the mid-to-high frequency loop needs to cross the main power board and the rectifier board, resulting in a long current path and a large high-frequency loop area.

[0061] To address the aforementioned technical problems, this application provides a rectifier component, such as... Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, it includes:

[0062] The rectifier board 1 includes a circuit board 11 and a secondary side assembly 12 disposed on the circuit board 11. The secondary side assembly 12 includes a first connection terminal 121, a second connection terminal 122, a rectifier module 123 and a first filter module 124. The first connection terminal 121 and the second connection terminal 122 are respectively connected to the two input terminals of the rectifier module 123, and the first filter module 124 is connected to the output terminal of the rectifier module 123.

[0063] Transformer module 2 includes an assembly frame 21 and a transformer T. The assembly frame 21 includes a first insulating plate 211 and a second insulating plate 212 arranged in an L-shape. The extension surface of the first insulating plate 211 is perpendicular to the extension surface of the second insulating plate 212. The second insulating plate 212 is parallel to the circuit board 11 and fixed on the circuit board 11. The transformer T is fixed to the inner side of the assembly frame 21. The two ends of the primary winding of the transformer T are led out from the first insulating plate 211, and the two ends of the secondary winding of the transformer T are led out from the second insulating plate 212. The two ends of the secondary winding of the transformer T are respectively connected to the first connecting terminal 121 and the second connecting terminal 122.

[0064] The rectifier assembly provided in this application includes a rectifier board 1 and a transformer module 2. The rectifier board 1 is provided with a first connection terminal 121, a second connection terminal 122, a rectifier module 123, and a first filter module 124. The transformer module 2 includes an assembly frame 21 and a transformer T. The assembly frame 21 includes a first insulating plate 211 and a second insulating plate 212 arranged in an L-shape. The second insulating plate 212 is fixed to the rectifier board 1. The two ends of the primary winding of the transformer T are led out from the first insulating plate 211, and the two ends of the secondary winding of the transformer T are led out from the second insulating plate 212. The ends of the primary winding of the transformer T and The ends of the secondary winding are led out from different sides of the transformer module 2, so the two ends of the primary winding of the transformer T can be easily connected to the main power board. The two ends of the secondary winding of the transformer T can be directly connected to the first connection terminal 121 and the second connection terminal 122 on the rectifier board 1. The secondary winding of the transformer T, the rectifier module 123 and the first filter module 124 form a high-frequency loop with a compact structure. The current path of the secondary winding of the transformer T can be directly on the transformer T and the rectifier board 1, without having to cross the main power board and then the rectifier board. This can shorten the current path of the secondary winding of the transformer T and thus reduce the area of ​​the high-frequency loop.

[0065] In this application, in the transformer module 2, the transformer T is disposed inside the assembly frame 21. The first insulating plate 211 of the assembly frame 21 may have a first lead-out hole 2111 corresponding to the end of the primary winding of the transformer T. The end of the primary winding of the transformer T can be led out of the transformer module 2 through the first lead-out hole 2111. The second insulating plate 212 of the assembly frame 21 may have a second lead-out hole 2121 corresponding to the end of the secondary winding of the transformer T. The end of the secondary winding of the transformer T can be led out of the transformer module 2 through the second lead-out hole 2121.

[0066] Specifically, the circuit board 11 of the rectifier board 1 may have a first socket corresponding to the end of the secondary winding of the transformer T. The end of the secondary winding of the transformer T may be inserted into the first socket to connect to the first connection terminal 121 or the second connection terminal 122.

[0067] Specifically, the circuit board 11 of the rectifier board 1 can be a printed circuit board (PCB). The first filter module 124 on the rectifier board 1 can be a filter capacitor.

[0068] In this embodiment of the application, the transformer module 2 may include a transformer T, and the corresponding rectifier board 1 may have a set of secondary-side components 12. For example, as Figure 7 As shown, transformer module 2 includes a first transformer T1, with the primary winding of the first transformer T1 being NP1 and the secondary winding being NS1.

[0069] Optionally, transformer module 2 may also include at least two transformers T, and the corresponding rectifier board 1 may have at least two sets of secondary-side components 12, with each set of secondary-side components 12 corresponding one-to-one with at least one transformer T in transformer module 2. The number of transformers T in transformer module 2 is not limited here and depends on the actual situation.

[0070] Specifically, the rectifier board 1 includes at least two sets of secondary side components 12, and the output terminals of the rectifier modules 123 of the at least two sets of secondary side components can be connected in parallel; the transformer module 2 can include at least two transformers T, and the at least two transformers T correspond one-to-one with the at least two sets of secondary side components 12. The primary windings of the at least two transformers T can be connected in series, and the two ends of the secondary winding of each transformer T can be connected to the first connection terminal 121 and the second connection terminal 122 in the corresponding secondary side component, respectively.

[0071] For example, such as Figure 4 , Figure 6 and Figure 8 As shown, transformer module 2 may include two transformers T, namely a first transformer T1 and a second transformer T2. The primary winding of the first transformer T1 is NP1 and the secondary winding is NS1, and the primary winding of the second transformer T2 is NP2 and the secondary winding is NS2, as shown. Figure 5 and Figure 8 As shown, the rectifier board 1 has two sets of secondary side components 12 that correspond one-to-one with the two transformers.

[0072] In this embodiment of the application, in the secondary side assembly, the rectifier module 123 and the first filter module 124 can be arranged between the first connection terminal 121 and the second connection terminal 122, which can shorten the current path of the secondary winding of the transformer T and thus reduce the high-frequency loop area.

[0073] In the embodiments of this application, such as Figure 7 and Figure 8 As shown, the rectifier module 123 can be a full-bridge rectifier circuit, and the two ends of the first filter module 124 can be connected to the two output terminals of the rectifier module 123.

[0074] Specifically, the rectifier module 123 may include a first rectifier tube, a second rectifier tube, a third rectifier tube, and a fourth rectifier tube; wherein, the input terminal of the first rectifier tube is connected to the output terminal of the second rectifier tube, the output terminal of the first rectifier tube is connected to the output terminal of the third rectifier tube, the input terminal of the third rectifier tube is connected to the output terminal of the fourth rectifier tube, and the input terminal of the fourth rectifier tube is connected to the input terminal of the second rectifier tube; a first connection terminal 121 is connected to the input terminal of the first rectifier tube, and a second connection terminal 122 is connected to the output terminal of the fourth rectifier tube;

[0075] The first end of the first filter module 124 is connected to the output end of the first rectifier tube, and the second end of the first filter module 124 is connected to the input end of the fourth rectifier tube.

[0076] Specifically, the first, second, third, and fourth rectifier diodes can be diodes, MOSFETs, or GaN power transistors, and the number of diodes, MOSFETs, or GaN power transistors can be at least one; there is no restriction, and it depends on the actual situation. For example, MOSFETs can be used as rectifier diodes, and the number of MOSFETs in each rectifier diode can be three.

[0077] Specifically, such as Figure 7 and Figure 8 As shown, the rectifier module 123 connected to the first transformer T1 may include a first rectifier tube D1, a second rectifier tube D2, a third rectifier tube D3, and a fourth rectifier tube D4. The first filter module 124 connected to the first rectifier tube D1 and the fourth rectifier tube D4 may be a first filter capacitor C1. The first filter capacitor C1 may include at least one multilayer ceramic capacitor. For example, the first filter capacitor C1 may include four multilayer ceramic capacitors.

[0078] In addition, such as Figure 8 As shown, the rectifier module 123 connected to the second transformer T2 may include a first rectifier tube D01, a second rectifier tube D02, a third rectifier tube D03, and a fourth rectifier tube D04. The first filter module 124 connected to the first rectifier tube D01 and the fourth rectifier tube D04 may be a first filter capacitor C01. The first filter capacitor C01 may include at least one multilayer ceramic capacitor. For example, the first filter capacitor C01 may include four multilayer ceramic capacitors.

[0079] In this embodiment, the first connecting terminal, the first rectifier tube, the third rectifier tube, and the second connecting terminal are arranged at intervals along the first direction. The second rectifier tube is disposed on one side of the first rectifier tube along the second direction, and the fourth rectifier tube is disposed on one side of the third rectifier tube along the second direction. The second direction is perpendicular to the first direction. The first rectifier tube, the second rectifier tube, the third rectifier tube, and the fourth rectifier tube are arranged around the first filter module, which can shorten the current path of the secondary winding of the transformer T, thereby reducing the high-frequency loop area.

[0080] Specifically, when the full-bridge rectifier circuit operates in the positive half-cycle of a high-frequency cycle, the path of the high-frequency loop in the power circuit can be as follows: Figure 9 As shown, Figure 9 The bold black line represents the high-frequency loop path. The first rectifier diode D1, the first filter capacitor C1, the fourth rectifier diode D4, and the secondary winding NS1 of the first transformer T1 form the high-frequency loop. Correspondingly, a schematic diagram of the high-frequency loop path on rectifier board 1 can be shown as follows: Figure 10 As shown, Figure 10 The path indicated by the black arrow in the middle is the high-frequency loop path on rectifier board 1.

[0081] Specifically, when the full-bridge rectifier circuit operates in the negative half-cycle of a high-frequency cycle, the path of the high-frequency loop in the power circuit can be as follows: Figure 11 As shown, Figure 11 The bold black line represents the high-frequency loop path. The third rectifier diode D3, the first filter capacitor C1, the second rectifier diode D2, and the secondary winding NS1 of the first transformer form the high-frequency loop. Correspondingly, a schematic diagram of the high-frequency loop path on rectifier board 1 can be shown as follows: Figure 12 As shown, Figure 12 The path indicated by the black arrow in the middle is the high-frequency loop path on rectifier board 1.

[0082] Figure 10 and Figure 12 In the secondary-side assembly, the first connecting terminal 121, the first rectifier D1, the third rectifier D3, and the second connecting terminal 122 are arranged at intervals along the first direction. The second rectifier D2 is disposed on one side of the first rectifier D1 along the second direction, and the fourth rectifier D4 is disposed on one side of the third rectifier D3 along the second direction. The second direction is perpendicular to the first direction. The first rectifier D1, the second rectifier D2, the third rectifier D3, and the fourth rectifier D4 are arranged around the first filter capacitor C1. This arrangement allows the secondary-side assembly to be compactly and reasonably arranged on the rectifier board 1. Compared with related technologies, this arrangement can shorten the current path in both the positive and negative half-cycles of the high-frequency cycle, thereby reducing the high-frequency loop area and improving the EMC performance and efficiency of the power supply.

[0083] In the embodiments of this application, such as Figure 13 , Figure 14 and Figure 15 As shown, the rectifier module 123 can also be a full-wave rectifier circuit; the secondary-side component 12 can also include a third connection terminal 125, the first end of the first filter module 124 is connected to the output end of the full-wave rectifier circuit, and the second end of the first filter module 124 is connected to the third connection terminal 125; the secondary winding of the transformer T also includes a center tap, which is led out from the second insulating plate 212 and connected to the third connection terminal 125, so as to realize the connection between the transformer T and the secondary-side component on the rectifier board 1.

[0084] like Figure 13As shown, transformer module 2 may include a third transformer T3. The primary winding of the third transformer T3 is NP3. One end of the secondary winding of the third transformer T3 is NS31, the other end is NS32, and the center tap is NS33. The two ends of the secondary winding of the third transformer T3, NS31 and NS32, are respectively connected to the first connection terminal 121 and the second connection terminal 122 in the secondary assembly, while the center tap NS33 is connected to the third connection terminal 125 in the secondary assembly, thereby realizing the connection between the third transformer T3 and the secondary assembly on the rectifier board 1.

[0085] Specifically, such as Figure 13 , Figure 14 and Figure 15 As shown, the rectifier module 123 may include a fifth rectifier tube D5 and a sixth rectifier tube D6. The input terminal of the fifth rectifier tube D5 is connected to the first connection terminal 121, and the output terminal of the fifth rectifier tube D5 is connected to the first terminal of the first filter module 124. The input terminal of the sixth rectifier tube D6 is connected to the second connection terminal 122, and the output terminal of the sixth rectifier tube D6 is connected to the output terminal of the fifth rectifier tube D5, thereby realizing the connection between the full-wave rectifier circuit, the transformer T, and the first filter module 124.

[0086] Specifically, the fifth rectifier diode D5 and the sixth rectifier diode D6 can be diodes, MOSFETs, or GaN power transistors, and the number of diodes, MOSFETs, or GaN power transistors can be at least one, without limitation, depending on the actual situation.

[0087] Specifically, the first filter module 124 can be the second filter capacitor C2, the first end of the second filter capacitor C2 is connected to the fifth rectifier tube D5, and the second end of the second filter capacitor C2 is connected to the third connection terminal 125.

[0088] In the embodiments of this application, such as Figure 14 and Figure 15 As shown, the first connection terminal 121, the fifth rectifier tube D5, the sixth rectifier tube D6, and the second connection terminal 122 are arranged along the first direction. The first filter module 124 is disposed on one side of the rectifier module 123 along the second direction. The third connection terminal 125 is disposed on the side of the first filter module 124 away from the rectifier module 123 along the second direction. This arrangement allows for a compact and reasonable arrangement of the secondary components on the rectifier board 1, which can shorten the current path of the secondary winding of the transformer T and thus reduce the high-frequency loop area.

[0089] Specifically, when the full-wave rectifier circuit operates in the positive half-cycle of a high-frequency cycle, the fifth rectifier diode D5, the second filter capacitor C2, and the secondary winding of the third transformer T3 form a high-frequency loop. A schematic diagram of this high-frequency loop path on rectifier board 1 can be shown as follows: Figure 14 As shown, Figure 14The path indicated by the brown arrow is the path of the high-frequency loop on rectifier board 1.

[0090] Specifically, when the full-wave rectifier circuit operates in the negative half-cycle of a high-frequency cycle, the sixth rectifier diode D6, the second filter capacitor C2, and the secondary winding of the third transformer T3 form a high-frequency loop. A schematic diagram of this high-frequency loop path on rectifier board 1 can be shown as follows: Figure 15 As shown, Figure 15 The path indicated by the black arrow in the middle is the path of the high-frequency loop on rectifier board 1.

[0091] Figure 14 and Figure 15 In the secondary-side assembly 12, the first connection terminal 121, the fifth rectifier tube D5, the sixth rectifier tube D6, and the second connection terminal 122 are arranged along the first direction. The second filter capacitor C2 is disposed on one side of the fifth rectifier tube D5 and the sixth rectifier tube D6 along the second direction. The third connection terminal 125 is disposed on the side of the second filter capacitor C2 away from the fifth rectifier tube D5 and the sixth rectifier tube D6 along the second direction. This arrangement allows for a compact and reasonable arrangement of the secondary-side assemblies on the rectifier board 1. Compared with related technologies, this arrangement can shorten the current path in both the positive and negative half-cycles of the high-frequency cycle, thereby reducing the high-frequency loop area and improving the EMC performance and efficiency of the power supply.

[0092] In this embodiment, the secondary side components on the rectifier board 1 can be one group or at least two groups. When there are at least two groups of secondary side components, the secondary side components can be arranged along the second direction, which facilitates the reasonable arrangement of components on the rectifier circuit board 11.

[0093] In this embodiment, the secondary side component can be disposed on the front side of the circuit board 11 or on the back side of the circuit board 11. There is no limitation here, and it depends on the actual situation.

[0094] In this embodiment of the application, the rectifier component may further include a second filter module 5, such as... Figure 4 and Figure 8 As shown, the two ends of the second filter module 5 are respectively connected to the two output terminals of the rectifier module 123 in the secondary side assembly. Specifically, as... Figure 8 As shown, the second filter module 5 can be the third filter capacitor C3, and the two ends of the third filter capacitor C3 can be connected to the two output terminals of each rectifier module 123 respectively.

[0095] Specifically, the third filter capacitor C3 can be composed of multiple electrolytic capacitors.

[0096] In this embodiment, the rectifier assembly may include two busbars that are phase-insulated. One busbar is connected to one output terminal of the rectifier module in the secondary assembly, and the other busbar is connected to the other output terminal of the rectifier module in the secondary assembly. The two busbars are located between the rectifier board and the second insulating plate of the transformer module, and the two busbars are stacked along the arrangement direction of the rectifier board and the transformer module. The two busbars are phase-insulated from the transformer module. The two ends of the second filter module are respectively connected to the two busbars. Current can be combined through the two busbars, which can effectively enhance the current carrying capacity of the rectifier assembly, reduce current-carrying line losses, and improve power efficiency.

[0097] Specifically, such as Figure 16 , Figure 17 and Figure 18 As shown, the two busbars can be positive busbar 3 and negative busbar 4, respectively. Positive busbar 3 is connected to the positive output terminal of rectifier module 123 in the secondary assembly, and negative busbar 4 is connected to the negative output terminal of rectifier module 123 in the secondary assembly. Positive busbar 3 can be located between rectifier board 1 and the second insulating plate 212 of transformer module 2, and negative busbar 4 can be located between positive busbar 3 and rectifier board 1, so that positive busbar 3 and negative busbar 4 are stacked. Positive busbar 3 and negative busbar 4 are insulated from transformer module 2. The two ends of the second filter module 5 can be connected to positive busbar 3 and negative busbar 4, respectively.

[0098] Among them, the positive busbar 3 is the positive output terminal of the rectifier component, and the negative busbar 4 is the negative output terminal of the rectifier component. The output of the rectifier component is DC, which can be combined through the positive busbar 3 and the negative busbar 4. Compared with the circuit board 11, it can effectively enhance the current carrying capacity of the rectifier component, reduce the current carrying line loss, and improve the power efficiency.

[0099] Specifically, insulating paper can be installed between the two busbars to ensure that the two busbars are insulated from each other.

[0100] In this embodiment, one of the two busbars may have a first plug-in terminal and the other busbar may have a second plug-in terminal. The two busbars can be plugged into the rectifier board through the first plug-in terminal and the second plug-in terminal, respectively, so that the busbars are connected to the rectifier module on the rectifier board. The structure is simple and easy to manufacture.

[0101] Specifically, such as Figure 18As shown, the positive busbar 3 may have a first plug-in terminal 34, which allows it to be plugged into the rectifier board 1, thus connecting the positive busbar 3 to the output terminal of the rectifier module on the rectifier board 1. The negative busbar 4 has a second plug-in terminal 41, which allows it to be plugged into the rectifier board 1, thus connecting the negative busbar 4 to the output terminal of the rectifier module on the rectifier board 1. The first plug-in terminal 34 can pass through the negative busbar 4 but does not contact it, thus achieving insulation between the positive busbar 3 and the negative busbar 4.

[0102] Alternatively, the first plug-in terminal can be located at the edge of the positive busbar 3, and the second plug-in terminal can be located at the edge of the negative busbar 4. The specific locations of the first and second plug-in terminals are not limited here and will be determined according to the actual situation.

[0103] Specifically, one end of the capacitor in the second filter module 5 can be plugged into the positive busbar 3, and the other end can be plugged into the negative busbar 4.

[0104] Specifically, such as Figure 17 As shown, the second filter module 5, positive busbar 3, and negative busbar 4 can be welded into a busbar assembly using wave soldering. Figure 19 As shown, the transformer module 2, rectifier board 1 and busbar assembly can be welded into a rectifier assembly by wave soldering.

[0105] In the embodiments of this application, Figures 16 to 18 In this circuit, the positions of the positive busbar 3 and the negative busbar 4 can be interchanged. That is, the positive busbar 3 can be set between the rectifier board 1 and the transformer module 2, and the negative busbar 4 can be set between the positive busbar 3 and the transformer module 2.

[0106] In this embodiment, the two busbars are located between the rectifier board 1 and the second insulating plate 212 of the transformer module 2. The second insulating plate is beneficial for the busbars to be insulated from the transformer module 2.

[0107] Specifically, since the end of the secondary winding of the transformer is led out by the second insulating plate, the busbar can be provided with a clearance notch O opposite to the end of the secondary winding of the transformer, so that the end of the secondary winding of the transformer is not in contact with the busbar, thereby achieving insulation between the busbar and the transformer module.

[0108] In this embodiment of the application, one of the two busbars may include a first part, a connecting part, and a second part connected in sequence; the first part is connected to the output terminal of the rectifier module in the secondary side assembly, and the second part is connected to the end of the filter module; the rectifier assembly may also include a high-frequency magnetic ring, which is fitted onto the connecting part to form a differential mode inductor.

[0109] Specifically, the positive busbar 3 may include a first part 31, a connecting part 33, and a second part 32 connected in sequence. A high-frequency magnetic ring 6 may be fitted onto the connecting part 33 of the positive busbar 3 to form a differential-mode inductor L1, such as... Figure 8 , Figures 16 to 18 As shown. The connecting part 33 can be bent. Optionally, the high-frequency magnetic ring 6 can also be fitted onto the negative busbar 3; this is not limited here and depends on the actual situation.

[0110] Traditional differential-mode inductor solutions typically involve winding a coil on a high-frequency magnetic ring to form an inductor, which is then soldered onto the main power board of the power supply product and connected in series in the power output circuit. In this embodiment, a high-frequency magnetic ring 6 is placed on the busbar, eliminating the need for an additional coil, reducing coil losses, and improving power supply efficiency.

[0111] Specifically, such as Figure 4 As shown, the rectifier assembly provided in this application has a high degree of integration, integrating the transformer T, rectifier board 1, high-frequency magnetic ring 6 (differential-mode inductor), and second filter module 5 into a single module, thereby improving the power density of the power supply. The rectifier assembly may include the high-frequency magnetic ring 6 (differential-mode inductor), or it may not include it, such as... Figure 19 The image shows a rectifier assembly without a high-frequency magnetic ring.

[0112] This application also provides a transformer-isolated DC / DC converter, including any of the rectifier components provided by the above-described technical solutions.

[0113] In this embodiment, the rectifier component is suitable for a transformer-isolated DC / DC converter with an intermediate AC link. The transformer-isolated DC / DC converter topology can be a phase-shifted full-bridge converter, a series resonant converter, or an LLC converter, etc.

[0114] Specifically, such as Figure 20 As shown, a transformer-isolated DC / DC converter may include a power input V, a primary circuit B, a transformer module, a secondary circuit, and a load R. Specifically, the primary circuit may be a half-bridge, full-bridge, or push-pull type, the secondary circuit may be a full-bridge rectifier type or a full-wave rectifier type, and the transformer module and the secondary circuit form an integrated rectifier assembly A.

[0115] For example, such as Figure 21The diagram shown is a circuit schematic of a transformer-isolated DC / DC converter according to an embodiment of this application. The primary circuit is a half-bridge type, including a first power transistor Q1, a second power transistor Q2, a DC blocking capacitor C4, and an inductor L2. The secondary circuit is a full-bridge type. In the above-mentioned transformer-isolated DC / DC converter, except for the first power transistor Q1, the second power transistor Q2, the DC blocking capacitor C4, and the inductor L2, all other power devices are integrated on the rectifier assembly, which can effectively improve the power density of the switching power supply and is conducive to the modular development of switching power supply products.

[0116] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A rectifier assembly, characterized in that, include; A rectifier board, comprising a circuit board and a secondary side assembly disposed on the circuit board, the secondary side assembly comprising a first connection terminal, a second connection terminal, a rectifier module and a first filter module, the first connection terminal and the second connection terminal being respectively connected to the two input terminals of the rectifier module, and the first filter module being connected to the output terminal of the rectifier module; A transformer module includes an assembly frame and a transformer. The assembly frame includes a first insulating plate and a second insulating plate arranged in an L-shape. The extension surface of the first insulating plate is perpendicular to the extension surface of the second insulating plate. The second insulating plate is parallel to the circuit board and fixed to the circuit board. The transformer is fixed to the inner side of the assembly frame. The two ends of the primary winding of the transformer are led out from the first insulating plate, and the two ends of the secondary winding of the transformer are led out from the second insulating plate. The two ends of the secondary winding of the transformer are respectively connected to the first connecting terminal and the second connecting terminal.

2. The rectifier assembly according to claim 1, characterized in that, The rectifier board includes at least two sets of secondary side components, and the output terminals of the rectifier modules of the at least two sets of secondary side components are connected in parallel. The transformer module includes at least two transformers, which correspond one-to-one with the at least two sets of secondary components. The primary windings of the at least two transformers are connected in series, and the two ends of the secondary winding of each transformer are respectively connected to the first connection terminal and the second connection terminal in the corresponding secondary component.

3. The rectifier assembly according to claim 1, characterized in that, In the secondary side assembly, the rectifier module and the first filter module are arranged between the first connection terminal and the second connection terminal.

4. The rectifier assembly according to claim 3, characterized in that, The rectifier module is a full-bridge rectifier circuit, and the two ends of the first filter module are connected to the two output terminals of the rectifier module.

5. The rectifier assembly according to claim 4, characterized in that, The rectifier module includes a first rectifier tube, a second rectifier tube, a third rectifier tube, and a fourth rectifier tube; The input terminal of the first rectifier is connected to the output terminal of the second rectifier, the output terminal of the first rectifier is connected to the output terminal of the third rectifier, the input terminal of the third rectifier is connected to the output terminal of the fourth rectifier, and the input terminal of the fourth rectifier is connected to the input terminal of the second rectifier. The first connection terminal is connected to the input terminal of the first rectifier tube, and the second connection terminal is connected to the output terminal of the fourth rectifier tube; The first end of the first filter module is connected to the output end of the first rectifier tube, and the second end of the first filter module is connected to the input end of the fourth rectifier tube. The first connecting terminal, the first rectifier tube, the third rectifier tube, and the second connecting terminal are arranged at intervals along the first direction. The second rectifier tube is disposed on one side of the first rectifier tube along the second direction. The fourth rectifier tube is disposed on one side of the third rectifier tube along the second direction. The second direction is perpendicular to the first direction. The first rectifier tube, the second rectifier tube, the third rectifier tube, and the fourth rectifier tube are arranged around the first filter module.

6. The rectifier assembly according to claim 3, characterized in that, The rectifier module is a full-wave rectifier circuit; The secondary side component also includes a third connection terminal, the first end of the first filter module is connected to the output end of the full-wave rectifier circuit, and the second end of the first filter module is connected to the third connection terminal; The secondary winding of the transformer also includes a center tap, which is led out from the second insulating plate and connected to the third connection terminal.

7. The rectifier assembly according to claim 6, characterized in that, The rectifier module includes a fifth rectifier tube and a sixth rectifier tube. The input terminal of the fifth rectifier tube is connected to the first connection terminal, and the output terminal of the fifth rectifier tube is connected to the first terminal of the first filter module. The input terminal of the sixth rectifier tube is connected to the second connection terminal, and the output terminal of the sixth rectifier tube is connected to the output terminal of the fifth rectifier tube. The first connection terminal, the fifth rectifier tube, the sixth rectifier tube, and the second connection terminal are arranged along a first direction. The first filter module is disposed on one side of the rectifier module along a second direction, and the third connection terminal is disposed on the side of the first filter module away from the rectifier module along the second direction.

8. The rectifier assembly according to any one of claims 1-7, characterized in that, It also includes a second filtering module, the two ends of which are respectively connected to the two output terminals of the rectifier module in the secondary side component.

9. The rectifier assembly according to claim 8, characterized in that, It also includes two busbars that are phase-insulated. One busbar is connected to one output terminal of the rectifier module in the secondary side assembly, and the other busbar is connected to the other output terminal of the rectifier module in the secondary side assembly. The two busbars are located between the rectifier board and the second insulating plate of the transformer module, and the two busbars are stacked along the arrangement direction of the rectifier board and the transformer module. The two busbars are phase-insulated from the transformer module. The two ends of the second filtering module are respectively connected to the two busbars.

10. The rectifier assembly according to claim 9, characterized in that, An insulating paper is provided between the two busbars to insulate them from each other.

11. The rectifier assembly according to claim 9, characterized in that, Of the two busbars, one busbar has a first plug-in terminal and the other busbar has a second plug-in terminal; The two busbars are respectively plugged into the rectifier board via the first plug-in terminal and the second plug-in terminal, so that the busbars are connected to the rectifier module on the rectifier board.

12. The rectifier assembly according to claim 9, characterized in that, The busbar has an edge with a clearance notch opposite to the end of the secondary winding of the transformer, so that the end of the secondary winding of the transformer does not contact the busbar.

13. The rectifier assembly according to claim 9, characterized in that, One of the busbars includes a first part, a connecting part, and a second part connected in sequence; The first part is connected to the output end of the rectifier module in the secondary side assembly, and the second part is connected to the end of the filter module; It also includes a high-frequency magnetic ring, which is fitted onto the connection portion to form a differential-mode inductor.

14. A transformer-isolated DC / DC converter, characterized in that, Includes the rectifier component as described in any one of claims 1-13.

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