Power module and power module group

Abstract

The invention discloses a power module and a power module group, the power module comprises power units, and each power unit comprises an upper bridge power unit and a lower bridge power unit; a lower bridge power unit; the printed circuit board comprises at least N prefabricated layers, N is larger than or equal to 3, each prefabricated layer comprises an insulating layer and a conductive structure, the adjacent prefabricated layers are isolated through the insulating layers and sequentially connected through the conductive structures, the first prefabricated layer to the Nth prefabricated layer are sequentially arranged from top to bottom, and N is a positive integer; the first end, the second end and the third end of the upper bridge power unit are located on the ith prefabricated layer, and the first end, the second end and the third end of the lower bridge power unit are located on the jth prefabricated layer. By directly embedding the power device in the printed circuit board and utilizing high-density interconnection and advanced packaging processes, ultralow stray inductance and high power density are realized, meanwhile, the system cost is saved, and the power conversion circuit can be widely applied to power conversion systems in the fields of new energy automobiles, industrial automation, renewable energy sources, consumer electronics and the like.

Description

Technical Field

[0001] This invention relates to the field of semiconductor integrated circuit manufacturing, and in particular to a power module and a power assembly. Background Technology

[0002] In the field of power electronics, traditional power modules (such as IGBT and MOSFET modules) typically use discrete components soldered onto the surface of a printed circuit board or achieve electrical connections through wire bonding.

[0003] This structure suffers from problems such as large parasitic parameters, high thermal resistance, and limited power density, making it unable to meet the demands of high-frequency, high-density applications. Meanwhile, the ever-increasing requirements of modern electronic systems for miniaturization, lightweight design, and high reliability further highlight the limitations of existing technologies. Summary of the Invention

[0004] In view of the above problems, the purpose of this invention is to provide a power module and power assembly with high power density and low inductance.

[0005] This invention provides a power module comprising power units, each power unit including: Upper bridge power unit; Lower bridge power unit; A printed circuit board includes at least N prefabricated layers, where N ≥ 3. Each prefabricated layer includes an insulating layer and a conductive structure. Adjacent prefabricated layers are isolated by the insulating layer and connected sequentially by the conductive structure. The first to the Nth prefabricated layers are arranged sequentially from top to bottom, where N is a positive integer. Power terminals include DC positive terminals, DC negative terminals, and AC terminals; The third terminal of the upper bridge power unit is electrically connected to the positive DC terminal, and the second terminal of the upper bridge power unit and the third terminal of the lower bridge power unit are electrically connected to the AC terminal; the second terminal of the lower bridge power unit is electrically connected to the negative DC terminal. The first, second, and third ends of the upper bridge power unit are located in the i-th prefabricated layer, and the first, second, and third ends of the lower bridge power unit are located in the j-th prefabricated layer, where 2≤i≤N-1, i is a positive integer, and 2≤j≤N-1, j is a positive integer.

[0006] Preferably, i=j, the upper bridge power unit is located between the i-th prefabricated layer and the (i+1)-th prefabricated layer, and the first, second, and third ends of the upper bridge power unit are conductive areas in the i-th prefabricated layer; the lower bridge power unit is located between the i-th prefabricated layer and the (i+1)-th prefabricated layer, and the first, second, and third ends of the lower bridge power unit are conductive areas in the i-th prefabricated layer.

[0007] Preferably, each of the first prefabricated layer to the i-th prefabricated layer includes a first conductive region, a second conductive region, a third conductive region, and a fourth conductive region; The first conductive region and the fourth conductive region of the first prefabricated layer to the (i-1)th prefabricated layer are electrically connected to each other, or the first conductive region and the fourth conductive region of the first prefabricated layer to the (i-1)th prefabricated layer are an integral structure.

[0008] Preferably, the third terminal of the upper bridge power unit is electrically connected to the third conductive region of the i-th prefabricated layer, or the third terminal of the upper bridge power unit serves as the third conductive region of the i-th prefabricated layer.

[0009] Preferably, the third terminal of the lower bridge power unit is electrically connected to the fourth conductive region of the i-th prefabricated layer, or the third terminal of the lower bridge power unit serves as the fourth conductive region of the i-th prefabricated layer.

[0010] Preferably, the second end of the upper bridge power unit is electrically connected to the first conductive region of the i-th prefabricated layer, or the second end of the upper bridge power unit serves as the first conductive region of the i-th prefabricated layer.

[0011] Preferably, the second end of the lower bridge power unit is electrically connected to the second conductive region of the i-th prefabricated layer, or the second end of the lower bridge power unit serves as the second conductive region of the i-th prefabricated layer.

[0012] Preferably, during commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure sequentially through the third conductive area of ​​the first to i prefabricated layers, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then sequentially through the first conductive area of ​​the i to first prefabricated layers and the AC terminal; When the lower bridge power unit is commutating: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first to i-th prefabricated layers, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the i-th to first prefabricated layers and the DC negative terminal.

[0013] Preferably, N equals 4. When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure in sequence through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, the third conductive area of ​​the third prefabricated layer, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then in sequence through the first conductive area of ​​the third prefabricated layer, the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; During commutation of the lower bridge power unit: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the third prefabricated layer, the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

[0014] Preferably, N equals 3. When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure in sequence through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, through the third end of the upper bridge power unit, the second end of the upper bridge power unit, the conductive structure, and then in sequence through the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal. When the lower bridge power unit is commutating: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

[0015] Preferably, during the commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure sequentially through the corresponding conductive areas in the first to i-th prefabricated layers, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then sequentially through the corresponding conductive areas in the i-th to first prefabricated layers and the AC terminal; When the lower bridge power unit is commutating: the current flows from the AC terminal through the conductive structure, sequentially through the conductive areas corresponding to the first to i-th prefabricated layers, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then sequentially through the conductive areas corresponding to the i-th to first prefabricated layers, and the DC negative terminal.

[0016] Preferably, each of the N prefabricated layers includes a first conductive region and a fourth conductive region, and each of the first to i-th prefabricated layers also includes a second conductive region and a third conductive region; In the N-layer prefabricated layer, the first conductive region and the fourth conductive region of each layer are interconnected, and the first conductive region and the fourth conductive region of each layer are an integral structure.

[0017] Preferably, the third terminal of the upper bridge power unit is electrically connected to the third conductive region of the i-th prefabricated layer, or the third terminal of the upper bridge power unit serves as the third conductive region of the i-th prefabricated layer.

[0018] Preferably, the third terminal of the lower bridge power unit is electrically connected to the fourth conductive region of the i-th prefabricated layer, or the third terminal of the lower bridge power unit serves as the fourth conductive region of the i-th prefabricated layer.

[0019] Preferably, the second end of the upper bridge power unit is electrically connected to the first conductive region of the i-th prefabricated layer, or the second end of the upper bridge power unit serves as the first conductive region of the i-th prefabricated layer.

[0020] Preferably, the second end of the lower bridge power unit is electrically connected to the second conductive region of the i-th prefabricated layer, or the second end of the lower bridge power unit serves as the second conductive region of the i-th prefabricated layer.

[0021] Preferably, during commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure sequentially through the third conductive area of ​​the first to i-th prefabricated layers, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then sequentially through the first conductive area of ​​the i-th to first prefabricated layers and the AC terminal; When the lower bridge power unit is commutating: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first to kth prefabricated layers, the conductive structure, back to the fourth conductive area of ​​the i-th prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the i-th to the first prefabricated layer and the DC negative terminal.

[0022] Preferably, N equals 5. When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure in sequence through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, the third conductive area of ​​the third prefabricated layer, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then in sequence through the first conductive area of ​​the third prefabricated layer, the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; During commutation of the lower bridge power unit: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, the fourth conductive area of ​​the fourth prefabricated layer, the fourth conductive area of ​​the fifth prefabricated layer, the conductive structure, back to the fourth conductive area of ​​the third prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the third prefabricated layer, the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

[0023] Preferably, N equals 4. When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure in sequence through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, through the third end of the upper bridge power unit, the second end of the upper bridge power unit, the conductive structure, the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal. During commutation of the lower bridge power unit: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, the fourth conductive area of ​​the fourth prefabricated layer, the conductive structure, back to the fourth conductive area of ​​the second prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

[0024] Preferably, N equals 4. During commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure in sequence through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, the third conductive area of ​​the third prefabricated layer, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then in sequence through the first conductive area of ​​the third prefabricated layer, the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; During commutation of the lower bridge power unit: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, the fourth conductive area of ​​the fourth prefabricated layer, the conductive structure, back to the fourth conductive area of ​​the third prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the third prefabricated layer, the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

[0025] Preferably, N equals 3. When the upper bridge power unit is commutating: the current flows from the DC positive terminal through the conductive structure in sequence through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then in sequence through the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; During commutation of the lower bridge power unit: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, the conductive structure, flows back to the fourth conductive area of ​​the second prefabricated layer, flows through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

[0026] Preferably, during the commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure sequentially through the corresponding conductive areas in the first to i-th prefabricated layers, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then sequentially through the corresponding conductive areas in the i-th to first prefabricated layers and the AC terminal; When the lower bridge power unit is commutated: the current flows from the AC terminal through the conductive structure in sequence through the corresponding conductive area in the first k-th prefabricated layer, the conductive structure, back to the corresponding conductive area in the i-th prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then sequentially through the corresponding conductive areas in the i-th to the first prefabricated layer and the DC negative terminal, i+1≤k≤N, and the k-th prefabricated layer is located below the power unit.

[0027] Preferably, the printed circuit board further includes an N+1th prefabricated layer, and the Nth prefabricated layer and the N+1th prefabricated layer are insulated from each other.

[0028] Preferably, the power module further includes a heat dissipation base plate, which is connected to the N+1th prefabricated layer by solder, sintering material or composite material.

[0029] Preferably, the power module further includes: The signal terminals include a first signal terminal, a second signal terminal, a third signal terminal, and a fourth signal terminal, wherein the first and second signal terminals are upper bridge signal terminals, and the third and fourth signal terminals are lower bridge signal terminals.

[0030] Preferably, the first prefabricated layer to the i-th prefabricated layer further includes a fifth conductive region, a sixth conductive region, a seventh conductive region, and an eighth conductive region; The first end of the upper bridge power unit passes through the fifth conductive area of ​​the i-th prefabricated layer to the fifth conductive area of ​​the first prefabricated layer and is electrically connected to the first signal terminal; the second end of the upper bridge power unit passes through the sixth conductive area of ​​the i-th prefabricated layer to the sixth conductive area of ​​the first prefabricated layer and is electrically connected to the second signal terminal. The first end of the lower bridge power unit passes through the seventh conductive area of ​​the i-th prefabricated layer to the seventh conductive area of ​​the first prefabricated layer and is electrically connected to the third signal terminal; the second end of the lower bridge power unit passes through the eighth conductive area of ​​the i-th prefabricated layer to the eighth conductive area of ​​the first prefabricated layer and is electrically connected to the fourth signal terminal.

[0031] Preferably, the signal terminal is connected to the first prefabricated layer by one of solder, sintering material or composite material.

[0032] Preferably, the power terminals are connected to the first prefabricated layer by one of solder, sintering material or composite material.

[0033] Preferably, the signal terminals and power terminals are embedded in the printed circuit board, exposing the first prefabricated layer.

[0034] Preferably, the upper bridge power unit includes one power device or multiple power devices connected in parallel; the lower bridge power unit includes one power device or multiple power devices connected in parallel.

[0035] Preferably, the power device is a gallium nitride power device.

[0036] Preferably, the upper bridge power unit is located between the i-th prefabricated layer and the (i+1)-th prefabricated layer, and the lower bridge power unit is located between the j-th prefabricated layer and the (j+1)-th prefabricated layer.

[0037] Preferably, the upper bridge power device and the lower bridge power device are any one of the following: a parallel structure of a metal oxide semiconductor field-effect transistor, a silicon carbide metal oxide semiconductor field-effect transistor, an insulated gate field-effect transistor, and a freewheeling diode.

[0038] Preferably, when the power device unit is a metal-oxide-semiconductor field-effect transistor or a silicon carbide metal-oxide-semiconductor field-effect transistor, the third terminal of the power device unit is the drain, the second terminal of the power device unit is the source, and the first terminal of the power device unit is the gate.

[0039] Preferably, when the power device unit is a parallel structure of an insulated-gate field-effect transistor and a freewheeling diode, the third terminal of the power device unit is the collector, the second terminal of the power device unit is the emitter, and the first terminal of the power device unit is the base. The cathode of the freewheeling diode is electrically connected to the first terminal of the power device unit, and the anode of the freewheeling diode is electrically connected to the first terminal of the power device unit.

[0040] Preferably, the power module includes three power modules, which are packaged together to form a three-phase full-bridge power module.

[0041] The power module provided by this invention includes power units, each power unit comprising: an upper bridge power unit; a lower bridge power unit; and a printed circuit board. The printed circuit board includes at least N prefabricated layers, where N≥3. Each prefabricated layer includes an insulating layer and a conductive structure. Adjacent prefabricated layers are isolated by the insulating layer and sequentially connected by the conductive structure. The first to Nth prefabricated layers are arranged from top to bottom, where N is a positive integer. The first, second, and third terminals of the upper bridge power unit are located on the i-th prefabricated layer, and the first, second, and third terminals of the lower bridge power unit are located on the j-th prefabricated layer, where 2≤i≤N-1, i is a positive integer, 2≤j≤N-1, and j is a positive integer. By directly embedding the power devices inside the printed circuit board, and utilizing high-density interconnection and advanced packaging technology, ultra-low impurity inductance and high power density are achieved, while simultaneously saving system costs. This technology can be widely applied to power conversion systems in fields such as new energy vehicles, industrial automation, renewable energy, and consumer electronics.

[0042] Furthermore, the power devices in the power module provided by this invention are gallium nitride power devices, which have high power density, low on-resistance, are easy to integrate and maintain, and can improve the stability of the power module and enhance thermal management efficiency. Attached Figure Description

[0043] The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which: Figure 1 A schematic diagram of the power module of the present invention is shown; Figure 2A circuit diagram of the power module of the present invention is shown; Figure 3 A four-layer structure diagram of the power module according to Embodiment 1 of the present invention is shown; Figure 4 A three-layer structure diagram of the power module according to Embodiment 1 of the present invention is shown; Figure 5 A top view of the three-layer structure of the power module according to Embodiment 1 of the present invention is shown; Figures 6 to 11 A schematic diagram of each layer structure of the power module according to Embodiment 1 of the present invention is shown; Figure 12 A five-layer structure diagram of the power module of the present invention, according to Embodiment 2, is shown; Figure 13 The diagram shows a four-layer structure of the power module according to a second embodiment of the present invention; Figure 14 The diagram shows a four-layer structure of the power module according to a second embodiment of the present invention; Figures 15 to 20 A schematic diagram of each layer structure of the power module in Embodiment 2 of the present invention is shown; Figure 21 A schematic diagram of a power module according to a first embodiment of the present invention is shown; Figure 22 A schematic diagram of a second embodiment of the power module of the present invention is shown. Detailed Implementation

[0044] The present application is described below based on embodiments, but it is not limited to these embodiments. In the detailed description of the present application below, certain specific details are described in detail. Those skilled in the art can fully understand the present application without these details. To avoid obscuring the substance of the present application, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0045] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0046] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] For ease of explanation, spatially related terms such as “inside,” “outside,” “below,” “below,” “lower,” “above,” “upper,” etc., are used herein to describe the relationship between one element or feature illustrated in the figure and another. It will be understood that spatially related terms may be intended to encompass different orientations of the device in use or operation besides those depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “below” another element or feature would then be positioned “above” that other element or feature. Thus, the exemplified term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially related descriptive terms used herein should be interpreted accordingly.

[0048] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0049] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0050] This invention provides a power module: such as Figure 1 As shown, it includes power units, each power unit comprising: Upper bridge power unit 11; Lower bridge power unit 12; A printed circuit board includes at least N prefabricated layers, where N ≥ 3. Each prefabricated layer includes an insulating layer and a conductive structure. Adjacent prefabricated layers are isolated by the insulating layer and connected sequentially by the conductive structure. The first prefabricated layer M1 to the Nth prefabricated layer Mn are arranged sequentially from top to bottom, where N is a positive integer. like Figure 2 As shown, the power terminals include a DC positive terminal DC+, a DC negative terminal DC-, and an AC terminal; the second terminal of the upper bridge power unit 11 and the third terminal of the lower bridge power unit 12 are electrically connected to the AC terminal, the third terminal of the upper bridge power unit 11 is electrically connected to the DC positive terminal DC+, and the second terminal of the lower bridge power unit 12 is electrically connected to the DC negative terminal DC-. The first, second, and third ends of the upper bridge power unit 11 are located in the i-th prefabricated layer Mi, and the first, second, and third ends of the lower bridge power unit are located in the j-th prefabricated layer Mj, where 2≤i≤N-1, i is a positive integer, and 2≤j≤N-1, j is a positive integer.

[0051] like Figure 3 , Figure 4 , Figures 12 to 14 As shown, i=j, the upper bridge power unit 11 is located between the i-th prefabricated layer Mi and the (i+1)-th prefabricated layer Mi+1, and the lower bridge power unit 12 is located between the i-th prefabricated layer Mi and the (i+1)-th prefabricated layer Mi+1.

[0052] like Figures 6 to 11 As shown, the first prefabricated layer M1 to the i-th prefabricated layer Mi each include a first conductive region S1, a second conductive region S2, a third conductive region D1 and a fourth conductive region D2; The first conductive region S1 and the fourth conductive region D2 of the first prefabricated layer M1 to the (i-1)th prefabricated layer Mi-1 are electrically connected to each other, or the first conductive region S1 and the fourth conductive region D2 of the first prefabricated layer to the (i-1)th prefabricated layer are an integral structure.

[0053] The third terminal of the upper bridge power unit 11 is electrically connected to the third conductive Mi-D1 of the i-th prefabricated layer, or the third terminal of the upper bridge power unit serves as the third conductive region D1 of the i-th prefabricated layer.

[0054] The third terminal of the lower bridge power unit 12 is electrically connected to the fourth conductive area Mi-D2 of the i-th prefabricated layer, or the third terminal of the lower bridge power unit serves as the fourth conductive area D2 of the i-th prefabricated layer.

[0055] The second end of the upper bridge power unit 11 is electrically connected to the first conductive area Mi-S1 of the i-th prefabricated layer, or the second end of the upper bridge power unit serves as the first conductive area S1 of the i-th prefabricated layer.

[0056] The second end of the lower bridge power unit 12 is electrically connected to the second conductive region Mi-S2 of the i-th prefabricated layer, or the second end of the lower bridge power unit serves as the second conductive region S2 of the i-th prefabricated layer.

[0057] like Figures 3 to 11 As shown, when the upper bridge power unit 11 is commutating: the current flows from the DC positive terminal DC+ through the conductive structure, sequentially through the third conductive area D1 of the first to i-th prefabricated layers, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, and then sequentially through the first conductive area S1 of the i-th to first prefabricated layers, and the AC terminal AC. When the lower bridge power unit 12 is commutating: the current flows from the AC terminal AC through the conductive structure, sequentially through the fourth conductive area D2 of the first to i-th prefabricated layers, through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, the conductive structure, and then sequentially through the second conductive area S2 of the i-th to first prefabricated layers, and the DC negative terminal DC-.

[0058] like Figure 3As shown, N equals 4. When the upper bridge power unit 11 is commutating: the current flows from the DC positive terminal DC+ through the conductive structure in sequence through the third conductive area M1-D1 of the first prefabricated layer, the third conductive area M2-D1 of the second prefabricated layer, the third conductive area M3-D1 of the third prefabricated layer, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, then in sequence through the first conductive area M3-S1 of the third prefabricated layer, the first conductive area M2-S1 of the second prefabricated layer, the first conductive area M1-S1 of the first prefabricated layer, and the AC terminal AC. During commutation of the lower bridge power unit: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area M1-D2 of the first prefabricated layer, the fourth conductive area M2-D2 of the second prefabricated layer, the fourth conductive area M3-D2 of the third prefabricated layer, through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, the conductive structure, and then in sequence through the second conductive area M3-S2 of the third prefabricated layer, the second conductive area M2-S2 of the second prefabricated layer, the second conductive area M1-S2 of the first prefabricated layer, and the DC negative terminal DC-.

[0059] like Figure 4 , Figure 5 As shown, N equals 3. When the upper bridge power unit 11 is commutated: the current flows from the DC positive terminal DC+ through the conductive structure, sequentially through the third conductive area M1-D1 of the first prefabricated layer, the third conductive area M2-D1 of the second prefabricated layer, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, and then sequentially through the first conductive area M2-S1 of the second prefabricated layer, the first conductive area M1-S1 of the first prefabricated layer, and the AC terminal AC. When the lower bridge power unit 12 is commutating: the current flows from the AC terminal through the conductive structure sequentially through the fourth conductive area M1-D2 of the first prefabricated layer, the fourth conductive area M2-D2 of the second prefabricated layer, through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, the second conductive area M2-S2 of the second prefabricated layer, and the DC negative terminal DC- of the second conductive area M1-S2 of the first prefabricated layer.

[0060] like Figures 3 to 11 As shown, when the upper bridge power unit 11 is commutated: the current flows from the DC positive terminal DC+ through the conductive structure through the corresponding conductive areas in the first to i-th prefabricated layers, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, and then through the corresponding conductive areas in the i-th to first prefabricated layers and the AC terminal AC. When the lower bridge power unit 12 is commutating: the current flows from the AC terminal AC through the conductive structure, sequentially through the corresponding conductive areas in the first to i-th prefabricated layers Mi, through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, the conductive structure, and then sequentially through the corresponding conductive areas in the i-th to first prefabricated layers, and the DC negative terminal DC-.

[0061] like Figures 15 to 20 As shown, each of the N prefabricated layers Mn contains a first conductive region S1 and a fourth conductive region D2. The first conductive region S1 and the fourth conductive region D2 are interconnected or are an integral structure. The first prefabricated layer M1 to the i-th prefabricated layer Mi also includes a second conductive region S2 and a third conductive region D1.

[0062] The third terminal of the upper bridge power unit 11 is electrically connected to the third conductive Mi-D1 of the i-th prefabricated layer, or the third terminal of the upper bridge power unit serves as the third conductive region D1 of the i-th prefabricated layer.

[0063] The third terminal of the lower bridge power unit 12 is electrically connected to the fourth conductive area Mi-D2 of the i-th prefabricated layer, or the third terminal of the lower bridge power unit serves as the fourth conductive area D2 of the i-th prefabricated layer.

[0064] The second end of the upper bridge power unit 11 is electrically connected to the first conductive area Mi-S1 of the i-th prefabricated layer, or the second end of the upper bridge power unit serves as the first conductive area S1 of the i-th prefabricated layer.

[0065] The second end of the lower bridge power unit 12 is electrically connected to the second conductive region Mi-S2 of the i-th prefabricated layer, or the second end of the lower bridge power unit serves as the second conductive region S2 of the i-th prefabricated layer.

[0066] like Figures 12 to 14 As shown, when the upper bridge power unit 11 is commutating: the current flows from the DC positive terminal DC+ through the conductive structure, sequentially through the third conductive area D1 of the first to the i-th prefabricated layers, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, and then sequentially through the first conductive area S1 of the i-th to the first prefabricated layers, and the AC terminal AC. When the lower bridge power unit 12 is commutating: the current flows from the AC terminal AC through the conductive structure in sequence through the fourth conductive area D2 of the first to kth prefabricated layers, the conductive structure, back to the fourth conductive area Mi-D2 of the i-th prefabricated layer, through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, the conductive structure, and then in sequence through the second conductive area S2 of the i-th to first prefabricated layers, and the DC negative terminal DC-.

[0067] like Figure 12As shown, N equals 5. When the upper bridge power unit 11 is commutating: the current flows from the DC positive terminal DC+ through the conductive structure in sequence through the third conductive area M1-D1 of the first prefabricated layer, the third conductive area M2-D1 of the second prefabricated layer, the third conductive area M3-D1 of the third prefabricated layer, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, and then in sequence through the first conductive area M3-S1 of the third prefabricated layer, the first conductive area M2-S1 of the second prefabricated layer, the first conductive area M1-S1 of the first prefabricated layer, and the AC terminal AC. During commutation of the lower bridge power unit 12: the current flows from the AC terminal through the conductive structure sequentially through the fourth conductive area M1-D2 of the first prefabricated layer, the fourth conductive area M2-D2 of the second prefabricated layer, the fourth conductive area M3-D2 of the third prefabricated layer, the fourth conductive area M4-D2 of the fourth prefabricated layer, the fourth conductive area M5-D2 of the fifth prefabricated layer, the conductive structure, flows back to the fourth conductive area M3-D2 of the third prefabricated layer, flows through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, the conductive structure, the second conductive area M3-S2 of the third prefabricated layer, the second conductive area M2-S2 of the second prefabricated layer, the second conductive area M1-S2 of the first prefabricated layer, and the DC negative terminal DC-.

[0068] like Figure 13 As shown, N equals 4. When the upper bridge power unit 11 is commutating: the current flows from the DC positive terminal DC+ through the conductive structure, sequentially through the third conductive area M1-D1 of the first prefabricated layer, the third conductive area M2-D1 of the second prefabricated layer, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, and then sequentially through the first conductive area M2-S1 of the second prefabricated layer, the first conductive area M1-S1 of the first prefabricated layer, and the AC terminal AC. When the lower bridge power unit 12 is commutating: the current flows from the AC terminal AC through the conductive structure in sequence through the fourth conductive area M1-D2 of the first prefabricated layer, the fourth conductive area M2-D2 of the first prefabricated layer, the fourth conductive area M3-D2 of the third prefabricated layer, the fourth conductive area M4-D2 of the fourth prefabricated layer, the conductive structure, back to the fourth conductive area M2-D2 of the second prefabricated layer, through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, the conductive structure, and then in sequence through the second conductive area M2-S2 of the second prefabricated layer, the second conductive area M1-S2 of the first prefabricated layer, and the DC negative terminal DC-.

[0069] like Figure 14As shown, N equals 4. When the upper bridge power unit 11 is commutating: the current flows from the DC positive terminal DC+ through the conductive structure in sequence through the third conductive area M1-D1 of the first prefabricated layer, the third conductive area M2-D1 of the second prefabricated layer, the third conductive area M3-D1 of the third prefabricated layer, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, the first conductive area M3-S1 of the third prefabricated layer, the first conductive area M2-S1 of the second prefabricated layer, the first conductive area M1-S1 of the first prefabricated layer, and the AC terminal AC. When the lower bridge power unit 12 is commutating: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area M1-D2 of the first prefabricated layer, the fourth conductive area M2-D2 of the second prefabricated layer, the fourth conductive area M3-D2 of the third prefabricated layer, the fourth conductive area M4-D2 of the fourth prefabricated layer, the conductive structure, back to the fourth conductive area M3-D2 of the third prefabricated layer, through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, and then in sequence through the second conductive area M3-S2 of the third prefabricated layer, the second conductive area M2-S2 of the second prefabricated layer, the second conductive area M1-S2 of the first prefabricated layer, and the DC negative terminal DC-.

[0070] When N equals 3, during commutation of the upper bridge power unit 11: the current flows from the DC positive terminal DC+ through the conductive structure, sequentially through the third conductive area M1-D1 of the first prefabricated layer, the third conductive area M3-D1 of the second prefabricated layer, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, and then sequentially through the first conductive area M2-S1 of the second prefabricated layer, the first conductive area M1-S1 of the first prefabricated layer, and the AC terminal AC. When the lower bridge power unit 12 is commutating: the current flows from the AC terminal AC through the conductive structure in sequence through the fourth conductive area M1-D2 of the first prefabricated layer, the fourth conductive area M2-D2 of the second prefabricated layer, the fourth conductive area M3-D2 of the third prefabricated layer, the conductive structure, flows back to the fourth conductive area M2-D2 of the second prefabricated layer, flows through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, the conductive structure, and then in sequence through the second conductive area M2-S2 of the second prefabricated layer, the second conductive area M1-S2 of the first prefabricated layer, and the DC negative terminal DC-.

[0071] like Figures 12 to 14 As shown, when the upper bridge power unit 11 is commutating: the current flows from the DC positive terminal DC+ through the conductive structure through the corresponding conductive areas in the first to i-th prefabricated layers, through the third terminal of the upper bridge power unit 11, the second terminal of the upper bridge power unit 11, the conductive structure, and then through the first conductive area S1 of the i-th to first prefabricated layers and the AC terminal. When the lower bridge power unit 12 is commutating: the current flows from the AC terminal AC through the conductive structure, sequentially through the corresponding conductive areas in the first to kth prefabricated layers, the conductive structure, back to the corresponding conductive area Mi in the i-th prefabricated layer, through the third terminal of the lower bridge power unit 12, the second terminal of the lower bridge power unit 12, and then sequentially through the corresponding conductive areas in the i-th to first prefabricated layers, and the DC negative terminal DC-, i+1<k≤N.

[0072] like Figure 9 , Figure 20 As shown in the figure, the printed circuit board also includes an N+1th prefabricated layer Mn+1, and the Nth prefabricated layer Mn and the N+1th prefabricated layer Mn+1 are insulated from each other.

[0073] like Figure 21 , Figure 22 As shown, the power module also includes a heat dissipation base plate 1, which is connected to the N+1th prefabricated layer Mn+1 by solder, sintering material or composite material.

[0074] like Figure 1 , Figure 4 , Figure 15 , Figure 16 As shown, the power unit also includes: The signal terminals include a first signal terminal G1, a second signal terminal S1, a third signal terminal G2, and a fourth signal terminal S2, wherein the first signal terminal G1 and the second signal terminal S1 are upper bridge signal terminals, and the third signal terminal G2 and the fourth signal terminal S2 are lower bridge signal terminals.

[0075] Figure 4 , Figure 15 , Figure 16 As shown, the first prefabricated layer M1 to the i-th prefabricated layer Mi also include a fifth conductive region, a sixth conductive region, a seventh conductive region and an eighth conductive region; The first end of the upper bridge power unit 11 passes through the fifth conductive area Mi-5 of the i-th prefabricated layer to the fifth conductive area M1-5 of the first prefabricated layer and is electrically connected to the first signal terminal G1; the second end of the upper bridge power unit 11 passes through the sixth conductive area Mi-6 of the i-th prefabricated layer to the sixth conductive area M1-6 of the first prefabricated layer and is electrically connected to the second signal terminal S1. The first end of the lower bridge power unit 12 extends from the seventh conductive area Mi-7 of the i-th prefabricated layer to the seventh conductive area M1-7 of the first prefabricated layer and is electrically connected to the third signal terminal G2; the second end of the lower bridge power unit 12 extends from the eighth conductive area Mi-8 of the i-th prefabricated layer to the eighth conductive area M1-8 of the first prefabricated layer and is electrically connected to the fourth signal terminal S2.

[0076] The signal terminals are connected to the first prefabricated layer M1 via solder, sintered material, or composite material.

[0077] The power terminals are connected to the first prefabricated layer M1 by one of solder, sintering material or composite material.

[0078] Signal terminals and power terminals are embedded in the printed circuit board, exposing the first prefabricated layer M1.

[0079] Furthermore, the upper bridge power unit 11 includes one or more power devices connected in parallel; the lower bridge power unit 12 includes one or more power devices connected in parallel.

[0080] The power devices are gallium nitride power devices.

[0081] The upper bridge power unit 11 is located between the i-th prefabricated layer Mi and the (i+1)-th prefabricated layer Mi+1, and the lower bridge power unit is located between the j-th prefabricated layer Mj and the (j+1)-th prefabricated layer Mj+1.

[0082] The upper-bridge power device and the lower-bridge power device are any one of the following: a parallel structure of a metal-oxide-semiconductor field-effect transistor, an insulated-gate field-effect transistor, and a freewheeling diode.

[0083] When the power device unit is a metal-oxide-semiconductor field-effect transistor or a silicon carbide metal-oxide-semiconductor field-effect transistor, the third terminal of the power device unit is the drain, the second terminal of the power device unit is the source, and the first terminal of the power device unit is the gate.

[0084] When the power device unit is a parallel structure of an insulated-gate field-effect transistor and a freewheeling diode, the third terminal of the power device unit is the collector, the second terminal of the power device unit is the emitter, and the first terminal of the power device unit is the base. The cathode of the freewheeling diode is electrically connected to the first terminal of the power device unit, and the anode of the freewheeling diode is electrically connected to the first terminal of the power device unit.

[0085] like Figure 21 , Figure 22 As shown, the power module includes three power modules, which are packaged together to form a three-phase full-bridge power module.

[0086] As described above, these embodiments of the present invention do not exhaustively cover all details, nor do they limit the invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A power module, characterized in that, Includes power units, each power unit comprising: Upper bridge power unit; Lower bridge power unit; A printed circuit board, the printed circuit board comprising at least N prefabricated layers, wherein N≥3, each prefabricated layer comprising an insulating layer and a conductive structure, adjacent prefabricated layers being isolated by an insulating layer and sequentially connected by a conductive structure, the first prefabricated layer to the Nth prefabricated layer being arranged sequentially from top to bottom, wherein N is a positive integer; The power terminals include a DC positive terminal, a DC negative terminal, and an AC terminal. The third terminal of the upper bridge power unit is electrically connected to the positive DC terminal, and the second terminal of the upper bridge power unit and the third terminal of the lower bridge power unit are electrically connected to the AC terminal; the second terminal of the lower bridge power unit is electrically connected to the negative DC terminal. The first, second, and third ends of the upper bridge power unit are located in the i-th prefabricated layer, and the first, second, and third ends of the lower bridge power unit are located in the j-th prefabricated layer, where 2≤i≤N-1, i is a positive integer, 2≤j≤N-1, and j is a positive integer.

2. The power module according to claim 1, characterized in that, Where i=j, the upper bridge power unit is located between the i-th prefabricated layer and the (i+1)-th prefabricated layer, and the first, second, and third ends of the upper bridge power unit are conductive areas in the i-th prefabricated layer; the lower bridge power unit is located between the i-th prefabricated layer and the (i+1)-th prefabricated layer, and the first, second, and third ends of the lower bridge power unit are conductive areas in the i-th prefabricated layer.

3. The power module according to claim 2, characterized in that, Each of the first prefabricated layer to the i-th prefabricated layer includes a first conductive region, a second conductive region, a third conductive region, and a fourth conductive region; The first conductive region and the fourth conductive region of the first prefabricated layer to the (i-1)th prefabricated layer are electrically connected to each other, or the first conductive region and the fourth conductive region of the first prefabricated layer to the (i-1)th prefabricated layer are an integral structure.

4. The power module according to claim 3, characterized in that, The third terminal of the upper bridge power unit is electrically connected to the third conductive region of the i-th prefabricated layer, or the third terminal of the upper bridge power unit serves as the third conductive region of the i-th prefabricated layer.

5. The power module according to claim 3, characterized in that, The third terminal of the lower bridge power unit is electrically connected to the fourth conductive region of the i-th prefabricated layer, or the third terminal of the lower bridge power unit serves as the fourth conductive region of the i-th prefabricated layer.

6. The power module according to claim 3, characterized in that, The second end of the upper bridge power unit is electrically connected to the first conductive area of ​​the i-th prefabricated layer, or the second end of the upper bridge power unit serves as the first conductive area of ​​the i-th prefabricated layer.

7. The power module according to claim 3, characterized in that, The second end of the lower bridge power unit is electrically connected to the second conductive region of the i-th prefabricated layer, or the second end of the lower bridge power unit serves as the second conductive region of the i-th prefabricated layer.

8. The power module according to claim 2, characterized in that, When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure through the third conductive area of ​​the first to i prefabricated layers, through the third end of the upper bridge power unit, the second end of the upper bridge power unit, the conductive structure, and then through the first conductive area of ​​the i to first prefabricated layers and the AC terminal. When the lower bridge power unit is commutated: the current flows from the AC terminal through the conductive structure through the fourth conductive area of ​​the first to i-th prefabricated layers, through the third end of the lower bridge power unit, the second end of the lower bridge power unit, the conductive structure, and then through the second conductive area of ​​the i-th to first prefabricated layers and the DC negative terminal.

9. The power module according to claim 8, characterized in that, When N equals 4, during the commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure sequentially through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, the third conductive area of ​​the third prefabricated layer, through the third end of the upper bridge power unit, the second end of the upper bridge power unit, the conductive structure, and then sequentially through the first conductive area of ​​the third prefabricated layer, the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; When the lower bridge power unit is commutated: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the third prefabricated layer, the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

10. The power module according to claim 8, characterized in that, When N equals 3, during the commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure sequentially through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, through the third end of the upper bridge power unit, the second end of the upper bridge power unit, the conductive structure, and then sequentially through the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal. When the lower bridge power unit is commutated: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

11. The power module according to claim 2, characterized in that, When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure through the corresponding conductive areas in the first to i-th prefabricated layers, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then through the corresponding conductive areas in the i-th to first prefabricated layers and the AC terminal. When the lower bridge power unit is commutated: the current flows from the AC terminal through the conductive structure through the conductive area corresponding to the first to i-th prefabricated layers, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then through the conductive area corresponding to the i-th to first prefabricated layers and the DC negative terminal.

12. The power module according to claim 2, characterized in that, Each of the N prefabricated layers includes a first conductive region and a fourth conductive region, and each of the first to i-th prefabricated layers also includes a second conductive region and a third conductive region; The first conductive region and the fourth conductive region of each of the N prefabricated layers are interconnected, and the first conductive region and the fourth conductive region of each of the N prefabricated layers are an integral structure.

13. The power module according to claim 12, characterized in that, The third terminal of the upper bridge power unit is electrically connected to the third conductive region of the i-th prefabricated layer, or the third terminal of the upper bridge power unit serves as the third conductive region of the i-th prefabricated layer.

14. The power module according to claim 12, characterized in that, The third terminal of the lower bridge power unit is electrically connected to the fourth conductive region of the i-th prefabricated layer, or the third terminal of the lower bridge power unit serves as the fourth conductive region of the i-th prefabricated layer.

15. The power module according to claim 12, characterized in that, The second end of the upper bridge power unit is electrically connected to the first conductive area of ​​the i-th prefabricated layer, or the second end of the upper bridge power unit serves as the first conductive area of ​​the i-th prefabricated layer.

16. The power module according to claim 12, characterized in that, The second end of the lower bridge power unit is electrically connected to the second conductive region of the i-th prefabricated layer, or the second end of the lower bridge power unit serves as the second conductive region of the i-th prefabricated layer.

17. The power module according to claim 12, characterized in that, When the upper bridge power unit is commutating: the current flows from the DC positive terminal through the conductive structure through the third conductive area of ​​the first to the i-th prefabricated layer, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then through the first conductive area of ​​the i-th to the first prefabricated layer and the AC terminal. When the lower bridge power unit is commutating: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first to kth prefabricated layers, the conductive structure, back to the fourth conductive area of ​​the i-th prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the i-th to the first prefabricated layer and the DC negative terminal.

18. The power module according to claim 12, characterized in that, When N equals 5, during the commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure sequentially through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, the third conductive area of ​​the third prefabricated layer, through the third end of the upper bridge power unit, the second end of the upper bridge power unit, the conductive structure, and then sequentially through the first conductive area of ​​the third prefabricated layer, the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; During the commutation of the lower bridge power unit: the current flows from the AC terminal through the conductive structure sequentially through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, the fourth conductive area of ​​the fourth prefabricated layer, the fourth conductive area of ​​the fifth prefabricated layer, the conductive structure, flows back to the fourth conductive area of ​​the third prefabricated layer, flows through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then sequentially through the second conductive area of ​​the third prefabricated layer, the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

19. The power module according to claim 12, characterized in that, When N equals 4, during the commutation of the upper bridge power unit: the current flows from the DC positive terminal through the conductive structure sequentially through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, through the third end of the upper bridge power unit, the second end of the upper bridge power unit, the conductive structure, the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; When the lower bridge power unit is commutated: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, the fourth conductive area of ​​the fourth prefabricated layer, the conductive structure, flows back to the fourth conductive area of ​​the second prefabricated layer, flows through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

20. The power module according to claim 12, characterized in that, The N is equal to 4. When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure in sequence through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, the third conductive area of ​​the third prefabricated layer, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then in sequence through the first conductive area of ​​the third prefabricated layer, the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; During the commutation of the lower bridge power unit: the current flows from the AC terminal through the conductive structure sequentially through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, the fourth conductive area of ​​the fourth prefabricated layer, the conductive structure, flows back to the fourth conductive area of ​​the third prefabricated layer, flows through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then sequentially through the second conductive area of ​​the third prefabricated layer, the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

21. The power module according to claim 12, characterized in that, The value of N is 3. When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure in sequence through the third conductive area of ​​the first prefabricated layer, the third conductive area of ​​the second prefabricated layer, through the third end of the upper bridge power unit, the second end of the upper bridge power unit, the conductive structure, and then in sequence through the first conductive area of ​​the second prefabricated layer, the first conductive area of ​​the first prefabricated layer, and the AC terminal; When the lower bridge power unit is commutated: the current flows from the AC terminal through the conductive structure in sequence through the fourth conductive area of ​​the first prefabricated layer, the fourth conductive area of ​​the second prefabricated layer, the fourth conductive area of ​​the third prefabricated layer, the conductive structure, flows back to the fourth conductive area of ​​the second prefabricated layer, flows through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then in sequence through the second conductive area of ​​the second prefabricated layer, the second conductive area of ​​the first prefabricated layer, and the DC negative terminal.

22. The power module according to claim 12, characterized in that, When the upper bridge power unit is commutated: the current flows from the DC positive terminal through the conductive structure, sequentially through the corresponding conductive areas in the first to i-th prefabricated layers, through the third terminal of the upper bridge power unit, the second terminal of the upper bridge power unit, the conductive structure, and then sequentially through the corresponding conductive areas in the i-th to first prefabricated layers and the AC terminal; When the lower bridge power unit is commutated: the current flows from the AC terminal through the conductive structure, sequentially through the corresponding conductive area in the first k-th prefabricated layer, the conductive structure, back to the corresponding conductive area in the i-th prefabricated layer, through the third terminal of the lower bridge power unit, the second terminal of the lower bridge power unit, the conductive structure, and then sequentially through the corresponding conductive areas in the i-th to the first prefabricated layer, and the DC negative terminal, where i+1≤k≤N, and the k-th prefabricated layer is located below the power unit.

23. The power module according to claim 1, characterized in that, The printed circuit board also includes an N+1th prefabricated layer, and there is insulation between the Nth prefabricated layer and the N+1th prefabricated layer.

24. The power module according to claim 23, characterized in that, The power module also includes a heat dissipation base plate, which is connected to the N+1th prefabricated layer by solder, sintering material or composite material.

25. The power module according to claim 1, characterized in that, The power unit further includes: The signal terminals include a first signal terminal, a second signal terminal, a third signal terminal, and a fourth signal terminal, wherein the first signal terminal and the second signal terminal are upper bridge signal terminals, and the third signal terminal and the fourth signal terminal are lower bridge signal terminals.

26. The power module according to claim 25, characterized in that, The first prefabricated layer to the i-th prefabricated layer also includes a fifth conductive region, a sixth conductive region, a seventh conductive region, and an eighth conductive region; The first end of the upper bridge power unit passes through the fifth conductive area of ​​the i-th prefabricated layer to the fifth conductive area of ​​the first prefabricated layer and is electrically connected to the first signal terminal; the second end S1 of the upper bridge power unit passes through the sixth conductive area of ​​the i-th prefabricated layer to the sixth conductive area of ​​the first prefabricated layer and is electrically connected to the second signal terminal. The first end of the lower bridge power unit passes through the seventh conductive area of ​​the i-th prefabricated layer to the seventh conductive area of ​​the first prefabricated layer and is electrically connected to the third signal terminal; the second end of the lower bridge power unit passes through the eighth conductive area of ​​the i-th prefabricated layer to the eighth conductive area of ​​the first prefabricated layer and is electrically connected to the fourth signal terminal.

27. The power module according to claim 25, characterized in that, The signal terminal is connected to the first prefabricated layer by one of solder, sintering material or composite material.

28. The power module according to claim 1, characterized in that, The power terminal is connected to the first prefabricated layer by one of solder, sintering material or composite material.

29. The power module according to claim 25, characterized in that, The signal terminal and the power terminal are embedded in the printed circuit board, exposing the first prefabricated layer.

30. The power module according to claim 1, characterized in that, The upper bridge power unit includes one or more power devices connected in parallel; the lower bridge power unit includes one or more power devices connected in parallel.

31. The power module according to claim 29, characterized in that, The power device is a gallium nitride power device.

32. The power module according to claim 1, characterized in that, The upper bridge power unit is located between the i-th prefabricated layer and the (i+1)-th prefabricated layer, and the lower bridge power unit is located between the j-th prefabricated layer and the (j+1)-th prefabricated layer.

33. The power module according to claim 1, characterized in that, The upper-bridge power device and the lower-bridge power device are any one of the following: a parallel structure of a metal-oxide-semiconductor field-effect transistor, an insulated-gate field-effect transistor, and a freewheeling diode.

34. The power module according to claim 33, characterized in that, When the power device unit is a metal-oxide-semiconductor field-effect transistor, the third terminal of the power device unit is the drain, the second terminal of the power device unit is the source, and the first terminal of the power device unit is the gate.

35. The power module according to claim 33, characterized in that, When the power device unit is a parallel structure of an insulated-gate field-effect transistor and a freewheeling diode, the third terminal of the power device unit is the collector, the second terminal of the power device unit is the emitter, and the first terminal of the power device unit is the base. The cathode of the freewheeling diode is electrically connected to the first terminal of the power device unit, and the anode of the freewheeling diode is electrically connected to the first terminal of the power device unit.

36. A power module, characterized in that... It includes three power modules, which are packaged together to form a three-phase full-bridge power module, wherein the power modules are any of the power modules described in claims 1 to 35.

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