Power conversion device and inductor

Abstract

This application provides a power conversion device and an inductor, relating to the technical field of power conversion equipment. In this power conversion device, the output circuit board is disposed on the side of the power circuit board opposite to the inductor; the inductor includes a carrier plate, a winding, a first cable, a second cable, and a conductive connector; the winding and the conductive connector are disposed on opposite sides of the carrier plate; the power circuit board is disposed on the side of the conductive connector away from the carrier plate; the first end of the winding passes through the carrier plate and connects to the conductive connector, which is connected to the power circuit board; the second end of the winding connects to one end of the first cable and one end of the second cable, the other end of the first cable is connected to the power circuit board, and the other end of the second cable is connected to the output circuit board; the orthographic projection of the conductive connector on the power circuit board is within the outline of the power circuit board; along the thickness direction of the carrier plate, the power circuit board and the second end of the winding do not overlap. This reduces the size of the power circuit board.

Description

Technical Field

[0001] This application relates to the field of power conversion equipment technology, and in particular to a power conversion device and an inductor. Background Technology

[0002] Inductors are inevitably present in power conversion devices. Inductors mainly play key roles in power conversion devices such as filtering, voltage regulation, energy storage, and energy transmission, ensuring that the power conversion device can efficiently and stably convert DC power into AC power.

[0003] In the prior art, inductors need to be connected to the power circuit board through conductive connectors. Along the arrangement direction of the circuit board and the inductor, the circuit board needs to cover all conductive connectors, resulting in an increase in the size of the circuit board. Summary of the Invention

[0004] This application provides a power conversion device and an inductor. The aim is to reduce the structural size of the circuit board and lower the cost of the power conversion device.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions: In a first aspect, this application provides a power conversion device. The power conversion device of this application embodiment can be applied in the fields of site energy, residential energy storage, industrial and commercial energy storage, large ground power station energy storage or vehicle charging. The power conversion device can be an inverter, uninterruptible power supply, energy storage converter or vehicle charger, etc.

[0006] The power conversion device includes a housing, an inductor, a power circuit board, and an output circuit board, both of which are housed within the housing. The power circuit board has a power circuit that converts direct current (DC) to alternating current (AC). The output circuit board is located on the side of the power circuit board opposite to the inductor. The AC power converted by the power circuit is output via the second circuit board. The inductor includes a carrier plate, a first winding cable, a second winding cable, and a conductive connector. Along the thickness direction of the carrier plate, the winding and the conductive connector are located on opposite sides of the carrier plate. Along the thickness direction of the carrier plate, the power circuit board is located on the side of the conductive connector away from the carrier plate. The winding has a first end and a second end. The first end of the winding passes through the carrier plate and connects to the conductive connector, which is fixed and electrically connected to the power circuit board. The second end of the winding connects to one end of the first cable and one end of the second cable. The other end of the first cable connects to the power circuit board, and the other end of the second cable connects to the output circuit board. Along the thickness direction of the carrier plate, the orthographic projection of the conductive connector on the power circuit board lies within the outline of the power circuit board. Along the thickness direction of the carrier plate, the power circuit board and the second end of the winding do not overlap.

[0007] In the power conversion device based on the embodiments of this application, the first end of the winding is connected to a conductive connector, and the conductive connector is fixed and electrically connected to the power circuit board. That is, the first end of the winding is connected to the power circuit board through the conductive connector. Along the thickness direction of the carrier plate, the orthographic projection of the conductive connector on the power circuit board is within the outline of the power circuit board, which facilitates the connection between the power circuit board and the conductive connector. The second end of the winding is connected to the power circuit board through a first cable, that is, the first cable extends from the second end of the winding to the power circuit board. In this way, the power circuit board does not need to cover the top of the second end of the winding. That is, along the thickness direction of the carrier plate, the power circuit board and the second end do not overlap, resulting in a smaller volume of the power circuit board.

[0008] Furthermore, in the prior art, the second end of the winding is connected to the power circuit board, and the power circuit board and the output circuit board are connected by a cable. That is, the AC power output from the second end of the winding is first transmitted to the power circuit board, and then transmitted from the power circuit board to the output circuit board via the cable. This necessitates connection structures for the connection between the second end of the winding and the power circuit board, as well as the connections between the cable and the power circuit board and the output circuit board. In this application, the second end of the winding is connected to the power circuit board via a first cable, and also to the output circuit board via a second cable, eliminating the need for a converter between the power circuit board and the output circuit board. This reduces the number of connection structures and thus lowers costs. Additionally, the more connection structures there are, the higher the probability of failure; therefore, the power conversion device of this application has higher reliability.

[0009] Furthermore, in existing technologies, all the AC current output from the second end of the winding needs to be transmitted to the power circuit board. After the high-frequency current is filtered out on the power circuit board, the low-frequency current is transmitted from the power circuit board to the output circuit board. Since only a small portion of the AC current output from the second end of the winding is high-frequency current and the majority is low-frequency current, the high-frequency current is small and the low-frequency current is large. When the AC current (high-frequency current + low-frequency current) is transmitted from the second end of the winding to the power circuit board, both high-frequency and low-frequency currents need to be transmitted. Therefore, a high-current cable is needed to connect the second end of the winding to the power circuit board. Similarly, a large low-frequency current needs to be transmitted from the power circuit board to the output circuit board. This results in a huge space occupation and thus an increased size of the power conversion device.

[0010] In this application, the second end of the winding is connected to the power circuit board via a first cable, which only needs to transmit low-frequency current to the power circuit board. The second end of the winding is connected to the output circuit board via a second cable, which transmits low-frequency current to the output circuit board. Therefore, the second cable only needs to be a high-current cable, while the first cable can be a thinner low-current cable. Furthermore, the first cable and the power circuit board can be connected through a smaller connection structure, which is sufficient to transmit low-frequency current, further reducing the cost of the power conversion device. At the same time, because the connection structure between the first cable and the power circuit board is smaller, the area of ​​the power circuit board can be smaller, or more electrical components can be arranged on the power circuit board, thus increasing the power density of the power circuit board.

[0011] In summary, this application, through the combined design of conductive connectors, a first cable, and a second cable, can reduce the area of ​​the power circuit board while ensuring the reliability of the power conversion device, and also reduce the size and cost.

[0012] In one possible implementation, there are two first cables; the inductor includes two first cables, two windings and two conductive connectors, with the first end of each winding connected to a conductive connector, the second end of each winding connected to one end of a first cable, and the other ends of the two first cables connected to each other and then connected to the power circuit board.

[0013] In this feasible method, an inductor contains two first cables, two windings, and two conductive connectors. The first end of each winding is connected to a power circuit board via a conductive connector, and the second end of each winding is connected to a first cable. That is, the first end of the winding and the conductive connector are connected one-to-one, and the second end of the winding and the first cable are connected one-to-one. After the ends of the two first cables away from the windings are connected to each other, they are then connected to the power circuit board. Thus, the connection point between the two first cables and the power circuit board is reduced to one, simplifying the structure of the power conversion device.

[0014] In one possible implementation, the power conversion device further includes a first terminal block connected to the ends of two first cables away from the windings, and the first terminal block is connected to a power circuit board.

[0015] In this feasible configuration, the ends of the two first cables furthest from the inductor are connected to the first terminal block, meaning the two first cables are connected in parallel via the first terminal block. Since the terminal block typically has a mating structure, it is easily connected to the power circuit board; for example, the OT terminal has a connection hole and can be connected to the power circuit board via a stud. Thus, the first terminal block not only enables the parallel connection of the two first cables but also facilitates easy connection to the power circuit board.

[0016] In one feasible approach, the first cable is a high-frequency cable.

[0017] In this feasible method, the first cable is connected between the second end of the winding and the power circuit board. After the first cable is set as a high-frequency cable, the high-frequency cable is a connection line designed for transmitting high-frequency electrical signals (such as radio frequency and microwave signals) from a few MHz to tens of GHz or even higher. The high-frequency cable can introduce high-frequency signals into the capacitor in a shorter time, that is, it can introduce high-frequency current into the capacitor for elimination more quickly, ensuring the waveform of the output AC power.

[0018] In one possible implementation, the inductor includes two second cables, two windings, and two conductive connectors. The first end of each winding is connected to a conductive connector, the second end of each winding is connected to one end of a second cable, and the other ends of the two second cables are connected to each other and then connected to the output circuit board.

[0019] In this feasible method, an inductor contains two windings and two conductive connectors. The first end of each winding is connected to the power circuit board through a conductive connector, and the second end of each winding is connected to a second cable. That is, the first end of the winding and the conductive connector are connected one-to-one, and the second end of the winding and the second cable are connected one-to-one. The two second cables are connected in parallel at the ends away from the windings before being connected to the output circuit board. This reduces the connection point between the two second cables and the output circuit board to one, simplifying the structure of the power conversion device.

[0020] In one possible implementation, the power conversion device further includes a second terminal block that connects to the ends of two second cables away from the windings, and the second terminal block is connected to the output circuit board.

[0021] In this feasible configuration, the ends of the two second cables furthest from the inductor are connected to the second terminal blocks, meaning the two second cables are connected in parallel via the second terminal blocks. Since the terminal blocks typically have a mating structure, this structure facilitates connection to the power circuit board; for example, the OT terminal has a connection hole that allows connection to the output circuit board via studs. Thus, the second terminal blocks not only enable the parallel connection of the two second cables but also facilitate easy connection to the output circuit board.

[0022] In one feasible approach, the second cable is a low-frequency cable.

[0023] In this feasible method, the output circuit board outputs the converted AC power to external electrical equipment. The second cable connects the second end of the winding to the output circuit board. That is, the second cable is used to transmit AC power with a lower frequency and stable waveform after being filtered by the winding. It can be understood that the AC power converted from DC power contains less high-frequency current and more low-frequency current. Therefore, the current transmitted by the second cable has a lower frequency and a larger current value. By setting the second cable as a low-frequency cable, the second cable can stably introduce AC power with a stable frequency and a large current value to the output circuit board.

[0024] In one feasible method, along the thickness direction of the support plate, there are clearance holes that penetrate both opposite sides of the support plate; the first end of the winding passes through the clearance holes and is connected to the conductive connector.

[0025] In this feasible method, the first end of the winding can pass through the clearance hole on the carrier plate, and along the thickness direction of the carrier plate, the first end of the winding passes through the two opposite sides of the carrier plate, and the first end of the winding can be connected to the conductive connector provided on the opposite side of the carrier plate.

[0026] In one possible implementation, a support base is provided on the side of the carrier plate that extends from the side away from the winding toward the power circuit board, and a conductive connector is connected to the side of the support base that is away from the carrier plate.

[0027] In this feasible method, after the conductive connector is connected to the power circuit board, the power circuit board exerts a force on the conductive connector. The greater the manufacturing tolerance and / or assembly tolerance, the greater the force exerted by the power circuit board on the conductive connector. Since the first end of the winding and the conductive connector are typically connected by welding or other methods, excessive force on the conductive connector can damage the connection between the first end of the winding and the conductive connector. By setting a support base on the carrier plate and placing the conductive connector on the support base to support the support base, part of the force exerted by the power circuit board on the conductive connector is transferred to the support base and then to the carrier plate. This reduces the force exerted by the power circuit board on the conductive connector, thereby protecting the connection between the conductive connector and the first end of the winding.

[0028] In one possible implementation, the power circuit board is provided with pads, and the support base is provided with fasteners; along the thickness direction of the carrier plate, the pads are provided with first through holes, and the conductive connectors are provided with second through holes; the power conversion device also includes a connector, which passes through the first and second through holes and is connected to the fasteners.

[0029] In this feasible method, the pads on the power circuit board are connected to the printed lines on the power circuit board. After the connector passes through the first through hole and the second through hole and is connected to the fastener, the connector and the fastener fix the power circuit board and the conductive connector together. The conductive connector is electrically connected to the pads on the power circuit board through the connector. That is, the current on the power circuit board is transmitted to the pads and then transmitted to the conductive connector through the connector, thereby realizing the fixed connection and electrical connection between the conductive connector and the power circuit board.

[0030] In one feasible approach, there are multiple inductors, and multiple carrier plates for these multiple inductors are integrated into one unit.

[0031] In this feasible approach, multiple inductor carrier plates are integrated, reducing the number of components that make up the inductor and improving its integration. Furthermore, having multiple conductive connectors on the same carrier plate facilitates and makes inductor assembly easier.

[0032] In one feasible approach, the support plate is a metal plate.

[0033] In this feasible method, alternating current passing through the windings generates an alternating magnetic field. When the metal plate is placed in this alternating magnetic field, it generates eddy currents (i.e., eddy currents) due to electromagnetic induction. These eddy currents then produce Joule heat on the metal plate. Since the windings and other electrical components are located on opposite sides of the support plate, the alternating magnetic field generated when the current passes through the windings induces eddy currents on the metal plate, which are ultimately converted into Joule heat. This reduces the impact of the alternating magnetic field generated when the current passes through the windings on other electrical components within the power conversion device.

[0034] In one feasible approach, the output circuit board and the second end of the winding do not overlap.

[0035] In this feasible method, the second end of the winding is connected to the output circuit board via a second cable, that is, the second cable extends from the second end of the winding to the output circuit board. In this way, the output circuit board does not need to cover the top of the second end of the winding. That is, along the thickness direction of the carrier plate, the output circuit board and the second end do not overlap, so the output circuit board is smaller in size.

[0036] Secondly, embodiments of this application provide an inductor, which includes a carrier plate, a winding, a first cable, and a conductive connector; along the thickness direction of the carrier plate, the winding and the conductive connector are disposed on opposite sides of the carrier plate; the winding has a first end and a second end, the first end of the winding passes through the carrier plate and is connected to the conductive connector, and the conductive connector is connected to a power circuit board; the second end of the winding is connected to one end of the first cable, and the other end of the first cable is connected to the power circuit board.

[0037] Based on the inductor provided in the embodiments of this application, the second end of the winding is connected to a first cable. The first cable can connect the second end of the winding to the circuit board. Therefore, the circuit board of the electrical device using the inductor does not need to extend to the second end of the winding, which can reduce the size of the circuit board of the electronic device. Attached Figure Description

[0038] Figure 1 This application provides a schematic diagram of the connection of a photovoltaic power station. Figure 2 A DC / AC circuit diagram provided for an embodiment of this application; Figure 3 An exploded structural diagram of a power conversion device, taking an inverter as an example, provided for an embodiment of this application; Figure 4 A schematic diagram of the connection between an inductor and a power circuit board provided in an embodiment of this application; Figure 5 A schematic diagram showing the connection of an inductor, power circuit board, and output circuit board provided in an embodiment of this application; Figure 6 This is a schematic diagram showing the connection between the inductor, power circuit board, and output circuit board in the prior art. Figure 7 This is a schematic diagram of the structure of an inductor provided in an embodiment of this application; Figure 8 This is a schematic diagram of another inductor structure provided in an embodiment of this application.

[0039] Figure label: a. Thickness direction of the support plate; 100, Photovoltaic module; 200, Inverter; 300, Energy storage cabinet; 400, Converter; 500, Transformer; 600, Power grid; 10, Outer shell; 11, Lower shell; 111, Receiving groove; 12, Top cover; 20, Power circuit board; 21, First through hole; 30, Inductor; 31, Support plate; 311, Clearance hole; 312, Support base; 32, Conductive connector; 321, Second through hole; 3 22. Card interface; 33. Winding; 331. First end; 3311. Snap-on; 332. Second end; 34. First cable; 35. First terminal block; 36. Second cable; 37. Second terminal block; 38. Magnetic core; 39. Housing; 391. Heat sink fins; 40. Output circuit board; 50. Connector; M1. First switching transistor; M2. Second switching transistor; M3. Third switching transistor; M4. Fourth switching transistor; C. Capacitor. Detailed Implementation

[0040] 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, 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.

[0041] The terms "first," "second," and similar terms used in this article do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "one" or similar terms do not indicate a quantity limitation, but rather indicate the existence of at least one.

[0042] In the embodiments of this application, the terms "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner. In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] First, let me explain the technical terms used in this application: Eddy current loss refers to the phenomenon where a conductor generates a circular current (eddy current) due to electromagnetic induction in an alternating magnetic field, resulting in the conversion of electrical energy into heat energy. Conductive components such as copper foil and metal support bases in power circuit boards may experience eddy current loss due to changes in the magnetic field during high-frequency signal transmission.

[0044] Alternating current (AC) refers to a current whose magnitude and direction change periodically with time; alternating magnetic field refers to a magnetic field whose magnitude and direction change with time. An alternating magnetic field is a magnetic field generated when alternating current is transmitted through a conductor. When the current is alternating current, the magnetic field generated will also change accordingly.

[0045] Inductive filtering utilizes the impedance characteristics of an inductor to impede the flow of high-frequency current, while allowing low-frequency or DC components to pass through the inductor's self-inductance to prevent sudden current changes and suppress high-frequency current.

[0046] Power circuit boards: responsible for the conversion, amplification, and control of electrical energy, such as AC / DC and DC / AC converter circuit boards.

[0047] Output circuit board: Specifically refers to the circuit section that connects to the final load; it is the final execution stage for signals or energy.

[0048] A power conversion device is an electronic device used to convert electrical energy from one form to another. For example, such a power conversion device can be an inverter, an uninterruptible power supply (UPS), an energy storage converter, or an on-board charger. The power conversion device of this application embodiment can be applied in fields such as site energy, residential energy storage, industrial and commercial energy storage, large-scale ground-mounted power station energy storage, or vehicle charging. This application embodiment uses an inverter as an example to illustrate the structure and function of the power conversion device.

[0049] Inverter 200 is suitable for photovoltaic (PV) power generation systems, which are systems that use photovoltaic modules 100 to absorb solar radiation energy for power generation. Figure 1 This is a connection diagram of a photovoltaic power station provided in an embodiment of this application. The following is in conjunction with... Figure 1 The function of the power conversion device is explained.

[0050] like Figure 1 As shown, the photovoltaic power station includes photovoltaic modules 100, inverters 200, energy storage cabinets 300, converters 400, transformers 500, and a power grid 600. Photovoltaic modules 100 convert solar energy into direct current (DC) and output it to inverters 200. Inverters 200 convert DC to alternating current (AC) and output it to transformers 500 and / or converters 400. Energy storage cabinets 300 store electrical energy or output the stored electrical energy as DC. Converters 400 convert AC to DC and output it to energy storage cabinets 300; or, they convert the DC output from energy storage cabinets 300 into AC and output it to converters 400. Transformers 500 step up the AC voltage and output it to the power grid 600.

[0051] From the above Figure 1 The analysis shows that the inverter 200 is used to convert DC power to AC power, and therefore the inverter 200 includes a DC / AC circuit for converting DC power to AC power. Figure 2 This is a DC / AC circuit diagram provided for an embodiment of this application. For example... Figure 2 As shown, the DC / AC circuit diagram includes power circuitry and output circuitry. The following is a combination of... Figure 2 A detailed explanation of the DC / AC circuit diagram is provided.

[0052] The power circuit includes four switching transistors (M1 and M4), two windings (M2 and M3), and a capacitor (C). The first switching transistor (M1) and the fourth switching transistor (M4) operate synchronously, as do the second switching transistor (M2) and the third switching transistor (M3). When the first switching transistor (M1) and the fourth switching transistor (M4) are on, the second switching transistor (M2) and the third switching transistor (M3) are off; conversely, when the first switching transistor (M1) and the fourth switching transistor (M4) are off, the second switching transistor (M2) and the third switching transistor (M3) are on, thus converting DC power into single-phase AC power. Because the capacitor (C) is located between the windings and the DC power supply, and C has the characteristic of passing high frequencies and blocking low frequencies, the high-frequency current in the single-phase AC power output from the windings can pass through the capacitor (C), meaning the capacitor (C) can filter out the high frequencies in the single-phase AC power, while blocking the low-frequency current. Therefore, the low-frequency current in the single-phase AC power is transmitted to the output circuit. In this application, "synchronous operation" refers to simultaneous on / off switching.

[0053] The output circuit includes a switch that controls whether the inverter 200 outputs AC power.

[0054] In this application, the two windings 33 and capacitor C form a filter circuit. This filter circuit filters the high-frequency AC current generated when the switching transistor is turned on and off. The remaining stable current is finally output from winding 33, making the output current closer to a sine wave. In some examples, capacitor C is a high-frequency filter capacitor. A high-frequency filter capacitor can provide a low-impedance path to ground for high-frequency noise (tens of MHz to GHz), instantly bypassing the high-frequency noise. For example, a multilayer ceramic capacitor (MLCC).

[0055] The switching transistor in this application embodiment can be a conventional transistor, an insulated-gate bipolar transistor (IGBT), or a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0056] Figure 3 This is an exploded structural diagram of a power conversion device, exemplified by an inverter 200, provided as an embodiment of this application. Figure 3 As shown, the power conversion device includes a housing 10, an inductor 30, and a power circuit board 20, with the power circuit board 20 disposed inside the housing 10.

[0057] The housing 10 is used to protect the power circuit board 20. In this application, the housing 10 can be a metal housing 10, a plastic housing 10, or a rubber housing 10. The metal housing 10 has high strength and heat dissipation performance; the plastic housing 10 is lightweight and low-cost; and the rubber housing 10 is suitable for harsh environments. Figure 3As shown, in some examples, the housing 10 includes an upper cover 12 and a lower housing 11, the lower housing 11 having a receiving groove 111, the upper cover 12 and the lower housing 11 being connected and covering the opening of the receiving groove 111 to form a sealed receiving cavity.

[0058] It is understood that the power circuit board 20 is disposed within the receiving groove 111 and protected by the outer casing 10. Furthermore, in some examples, the power circuit board 20 in this application can be fixed to the lower casing 11. For example, the power circuit board 20 and the lower casing 11 can be fixed by means of screw connection, adhesive bonding, or snap-fit ​​connection.

[0059] The power circuit board 20 is provided with such Figure 2 The power circuit shown Figure 2 The first switch M1, the second switch M2, the third switch M3, the fourth switch M4, and the two windings 33 shown are all connected to the power circuit board 20 and are electrically connected through circuits provided on the power circuit board 20. The power circuit board 20 in this application can be a rigid printed circuit board (PCB) or a flexible printed circuit board (FPC).

[0060] Figure 4 This application provides a schematic diagram illustrating the connection between an inductor 30 and a power circuit board 20; it is understood that... Figure 4 This is intended to illustrate the relative positional relationship between the power circuit board 20 and the inductor 30; the size and thickness of the power circuit board 20 can be changed according to the actual needs of the product. The following is in conjunction with... Figure 4 The structure of inductor 30 will be explained.

[0061] Inductor 30 functionally needs to filter the AC output from the four switching transistors, and structurally needs to be connected to the power circuit board 20, such as... Figure 4 As shown, in some examples, the inductor 30 includes a carrier plate 31, a winding 33, a first cable 34, and a conductive connector 32.

[0062] The support plate 31 is used to support the conductive connector 32 and the winding 33, such as Figure 4 As shown, in some examples, both the conductive connector 32 and the winding 33 are mounted on the support plate 31, thereby enabling the support plate 31 to support the conductive connector 32 and the winding 33. In this embodiment, the shape, size, and material of the support plate 31 are not limited, as long as the support plate 31 can support the conductive connector 32 and the winding 33.

[0063] When alternating current passes through winding 33, it generates an alternating magnetic field. This alternating magnetic field can cause electromagnetic interference to other electrical components in the power conversion device. For example, the surface of the power circuit board 20 has printed lines made of copper foil. The alternating magnetic field will generate eddy current losses on the copper foil, causing it to heat up. However, the resistance of the conductor increases with temperature, leading to increased losses when current is transmitted through the printed lines formed by the copper foil on the circuit board. Therefore, in order to reduce the impact of the alternating magnetic field generated when alternating current passes through winding 33 on other electrical components in the power conversion device, such as... Figure 4 As shown, in some examples, along the thickness direction a of the carrier plate 31, the winding 33 and the conductive connector 32 are disposed on opposite sides of the carrier plate 31, and the power circuit board 20 is disposed on the side of the conductive connector 32 away from the carrier plate 31.

[0064] The conductive connector 32 and the power circuit board 20 are located on the same side of the carrier plate 31, while the winding 33 and the power circuit board 20 are located on opposite sides of the carrier plate 31. In this case, the conductive connector 32 and the power circuit board 20 are close to each other, which facilitates their connection. However, the winding 33 and the power circuit board 20 are far apart. When alternating current passes through the winding 33, the strength of the alternating magnetic field decreases with increasing distance from the winding 33. Therefore, the copper foil on the power circuit board 20 is less affected by the alternating magnetic field generated by the winding 33.

[0065] To further reduce the impact of the alternating magnetic field generated when AC current passes through winding 33 on power circuit board 20, in some examples, the carrier plate 31 is a metal plate.

[0066] When the metal plate is in an alternating magnetic field, it generates eddy currents (i.e., eddy currents) due to electromagnetic induction. These eddy currents generate Joule heat on the metal plate. Since the winding 33 and the power circuit board 20 are located on opposite sides of the support plate 31, the alternating magnetic field generated when the AC current passes through the winding 33 must pass through the support plate 31 to reach the power circuit board 20. A portion of the alternating magnetic field generated when the AC current passes through the winding 33 generates eddy currents on the metal plate and is ultimately converted into Joule heat. This reduces the electromagnetic interference of the alternating magnetic field generated when the current passes through the winding 33 on the power circuit board 20.

[0067] The same principle can be used in this application to reduce electromagnetic interference to other electrical components in the power conversion device caused by the alternating magnetic field generated when AC current passes through winding 33.

[0068] To improve the structural strength of the support plate 31, in some examples, at least one of the two opposite sides of the support plate 31 along the thickness direction a can be provided with a reinforcing grid (not shown in the figure); the reinforcing grid enhances the structural strength of the support plate 31, enabling the support plate 31 to withstand greater external forces to support the heavy inductor 30.

[0069] Winding 33 is used to filter the alternating current transmitted through it. It is understood that winding 33 has a first end 331 and a second end 332. Both the first end 331 and the second end 332 of winding 33 need to be connected to the circuit on the power circuit board 20, so that the alternating current is transmitted from the first end 331 into winding 33 and output from the second end 332 out of winding 33. To connect winding 33 to the circuit on the power circuit board 20, such as... Figure 4 As shown, in some examples, the first end 331 of the winding 33 passes through the carrier plate 31 and is connected to the conductive connector 32, which is fixed and electrically connected to the power circuit board 20; the second end 332 of the winding 33 is connected to one end of the first cable 34, the end of the first cable 34 away from the winding 33 being connected to the power circuit board 20. Thus, the first end 331 of the winding 33 is connected to the power circuit board 20 via the conductive connector 32, and the second end 332 of the winding 33 is connected to the power circuit board 20 via the first cable 34, connecting the winding 33 to the circuitry on the power circuit board 20.

[0070] To improve the filtering effect of winding 33, such as Figure 4 As shown, in some examples, the inductor 30 also includes a magnetic core 38, and the winding 33 is sleeved on the magnetic core 38. The magnetic core 38 enhances the magnetic induction intensity of the winding 33 through a high magnetic permeability material, reduces leakage flux, and improves energy transmission efficiency. Under the same magnetic induction intensity, the winding 33 can have a smaller size, that is, the magnetic core 38 improves the filtering effect of the winding 33.

[0071] In order for the first end 331 of the winding 33 to pass through the carrier, such as Figure 4 As shown, in some examples, along the thickness direction a of the support plate 31, the support plate 31 is provided with clearance holes 311 that penetrate both opposite sides of the support plate 31; the first end 331 of the winding 33 passes through the clearance holes 311 and is connected to the conductive connector 32.

[0072] After the carrier plate 31 is set as a metal plate, the smaller the opening area of ​​the clearance hole 311, the better the carrier plate 31 will reduce the electromagnetic interference of the alternating magnetic field on the power circuit board 20. However, if the opening of the clearance hole 311 is too small, the winding 33 may come into contact with the carrier plate 31. Therefore, in some examples, an insulating layer is provided between the first end 331 of the winding 33 and the hole wall of the clearance hole 311. In this way, the opening area of ​​the clearance hole 311 can be small to ensure the effect of the carrier plate 31 in reducing the electromagnetic interference of the alternating magnetic field on the power circuit board 20, and to prevent cross-current between the carrier plate 31 and the winding 33.

[0073] After the first end 331 of the winding 33 passes through the carrier plate 31, in order to connect the first end 331 of the winding 33 with the conductive connector 32, as follows: Figure 4 As shown, in some examples, the conductive connector 32 is provided with a card interface 322. After the first end 331 of the winding 33 passes through the card interface 322, it branches into two buckles 3311. The two buckles 3311 extend perpendicularly to the thickness direction a of the bearing plate 31, and the two buckles 3311 extend in opposite directions. In this way, the connection between the conductive connector 32 and the first end 331 of the winding 33 is realized.

[0074] To strengthen the connection between the conductive connector 32 and the first end 331 of the winding 33, in some examples, the connection between the conductive connector 32 and the first end 331 of the winding 33 can be further reinforced by welding or other methods.

[0075] To facilitate the connection between the power circuit board 20 and the winding 33, specifically, to facilitate the connection between the conductive connector 32, the first cable 34, and the power circuit board 20, such as... Figure 4 As shown, in some examples, along the thickness direction a of the carrier plate 31, the orthographic projection of the conductive connector 32 on the power circuit board 20 is within the outline of the power circuit board 20; along the thickness direction a of the carrier plate 31, the power circuit board 20 and the second end 332 of the winding 33 do not overlap.

[0076] Since the orthographic projection of the conductive connector 32 on the power circuit board 20 is within the outline of the power circuit board 20 along the thickness direction a of the carrier plate 31, the conductive connector 32 and the power circuit board 20 can be connected at their overlapping positions. Since the power circuit board 20 and the second end 332 of the winding 33 do not overlap, and the carrier plate 31 and the second end 332 of the winding 33 do not overlap, neither the carrier plate 31 nor the power circuit board 20 obstructs the first cable 34. The first cable 34 can extend from the second end 332 of the winding 33 to the power circuit board 20. This not only facilitates the connection of the first cable 34 to the second section of the winding 33 and the power circuit board 20, but also eliminates the need for the power circuit board 20 to cover the top of the second end 332 of the winding 33. In other words, since the power circuit board 20 and the second end 332 of the winding 33 do not overlap along the thickness direction a of the carrier plate 31, the power circuit board 20 has a smaller volume.

[0077] Depend on Figure 2 As can be seen from the power conversion circuit, two windings 33 need to be connected in the circuit, such as Figure 4 As shown, in some examples, the inductor 30 includes two windings 33, that is, the two windings 33 are integrated into one inductor 30, which increases the integration of the inductor 30, that is, increases the integration of the power conversion device.

[0078] Combined with the above-mentioned winding 33 wound around the magnetic core 38, such as Figure 4As shown, in some examples, the two windings 33 share a single magnetic core 38, which can be fixed to the carrier plate 31 to indirectly fix the windings 33 to the carrier plate 31, further improving the integration of the inductor 30, that is, further improving the integration of the power conversion device.

[0079] In order to connect the two windings 33 into the circuit, as follows Figure 4 As shown, in some examples, the inductor 30 includes two first cables 34 and two conductive connectors 32. The first end 331 of each winding 33 is connected to a conductive connector 32, and the second end 332 of each winding 33 is connected to one end of a first cable 34. The other ends of both first cables 34 are connected to the power circuit board 20.

[0080] In this way, an inductor 30 is provided with two windings 33 and two conductive connectors 32. The first end 331 of each winding 33 is connected to the power circuit board 20 through a conductive connector 32, and the second end 332 of each winding 33 is connected to the power circuit board 20 through a first cable 34. That is, the first end 331 of the winding 33 and the conductive connector 32 are connected one-to-one, and the second end 332 of the winding 33 and the first cable 34 are connected one-to-one, so that both windings 33 are connected to the power circuit board 20.

[0081] To reduce the number of connection points between the first cable 34 and the power circuit board 20, such as Figure 4 As shown, in some examples, the ends of the two first cables 34 furthest from the inductor 30 are connected to each other and then to the power circuit board 20. In this way, the connection point between the two first cables 34 and the power circuit board 20 is reduced to one, which simplifies the structure of the power conversion device and improves the power density of the power conversion device.

[0082] To enable the two first cables 34 to be interconnected at the ends furthest from the inductor 30 before being connected to the power circuit board 20, such as... Figure 4 As shown, in some examples, the power conversion device further includes a first terminal 35 that connects the ends of the two first cables 34 away from the inductor 30, and the first terminal 35 is connected to the power circuit board 20.

[0083] The ends of the two first cables 34 furthest from the inductor 30 are both connected to the first terminal block 35, meaning the two first cables 34 are connected in parallel through the first terminal block 35. Since the terminal block typically has a mating structure, it is easy to connect to the power circuit board 20; for example, the OT terminal has a connection hole and can be connected to the power circuit board 20 via a stud. Thus, the first terminal block 35 not only achieves the parallel connection of the two first cables 34 but also facilitates connection to the power circuit board 20.

[0084] It is understood that in other examples, the two first cables 34 may be interconnected in other ways before being connected to the power circuit board 20, and this application embodiment does not limit this. For example, the ends of the two first cables 34 away from the winding 33 may be twisted together before being connected to the power circuit board 20.

[0085] The first cable 34 is used to connect the second end 332 of the winding 33 to the circuit on the power circuit board 20, by Figure 2 It can be seen that the second end 332 of the winding 33 is connected to the negative terminal of the power supply through the circuit to form a loop. In some examples, the first cable 34 is a high-frequency cable.

[0086] The first cable 34 is connected between the second end 332 of the winding 33 and the power circuit board 20. After the first cable 34 is configured as a high-frequency cable, it is determined that the high-frequency cable is a connection line specifically designed for transmitting high-frequency electrical signals (such as radio frequency and microwave signals) ranging from a few MHz to tens of GHz or even higher. The high-frequency cable can introduce high-frequency signals into the capacitor C in a shorter time, meaning that high-frequency current can be introduced into the capacitor C more quickly (see reference...). Figure 2 (As shown) Eliminate the waveform of the output AC power.

[0087] To improve the shielding capability of the first cable 34, in some examples, the high-frequency cable in this application embodiment includes a center conductor, an insulation layer, a shielding layer, and an outer sheath. The insulation layer is wrapped around the outside of the center conductor, the shielding layer is wrapped around the outside of the insulation layer, and the outer sheath includes a coaxial structure formed outside the shielding layer.

[0088] To further enhance the shielding capability of the first cable 34, in some examples, two portions of the first cable 34 are intertwined to form a twisted-pair structure. In the twisted-pair structure, two conductors with insulating protective layers are twisted together at a certain density. The electromagnetic waves radiated by each conductor during transmission are canceled out by the electromagnetic waves emitted by the other conductor, effectively reducing the degree of signal interference.

[0089] Figure 5 This is a schematic diagram showing the connection of another inductor 30, power circuit board 20, and output circuit board 40 provided in an embodiment of this application. Figure 4 On this basis, Figure 5 An output circuit board 40 and a second cable 36 have been added. This is understandable. Figure 5 This is intended to illustrate the relative positions of the power circuit board 20, the output circuit board 40, and the inductor 30; the size and thickness of the power circuit board 20 and the output circuit board 40 can be changed according to actual product requirements. The following is in conjunction with... Figure 4 The structure of inductor 30 will be explained.

[0090] Power circuits are a major source of electromagnetic interference (EMI). Power circuits (such as switching transistors, rectifiers, and high-current traces) generate strong electromagnetic noise and transient currents during operation, which can easily couple to sensitive output circuits through power supply or ground lines. Output circuits typically contain analog signals, feedback loops, or sophisticated control logic, which are extremely sensitive to power supply ripple and ground bounce. Therefore, to improve the stability of power conversion devices, such as… Figure 5 As shown, in some examples, the power conversion device also includes an output circuit board 40, which is connected to the second end 332 of the winding 33. The stable AC power output from the second end 332 of the winding 33 is transmitted to the output circuit board 40, which controls the distribution of the output to external electrical devices. It is understood that the output circuit board 40 is equipped with... Figure 2 The output circuit shown can be controlled by a chip located on the output circuit board 40.

[0091] By physically separating the power circuit and the output circuit, which are respectively located on the power circuit board 20 and the output circuit board 40, interference paths can be effectively blocked. This avoids the digital switching noise of the power circuit from polluting the analog signal of the output circuit, ensuring control accuracy and improving system stability.

[0092] Meanwhile, in this application, the switching transistor is set on the power circuit board 20. However, the switching transistor generates a lot of heat. By setting the output circuit board 40 separately, the heat dissipation of the switching transistor during operation is reduced, which affects the low-power control chip on the output circuit board 40.

[0093] Since the first end 331 of the winding 33 needs to be connected to the conductive connector 32 and the power circuit board 20, such as Figure 5 As shown, in some examples, the output circuit board is located on the side of the power circuit board 20 away from the inductor 30. The conductive connector 32 can be directly connected to the power circuit board 20 without affecting the direct connection between the conductive connector 32 and the power circuit board 20.

[0094] To achieve the connection between the second end 332 of the winding 33 and the output circuit board 40, such as Figure 5 As shown, in some examples, inductor 30 also includes a second cable 36, one end of which is connected to the second end 332 of winding 33, and the other end of which is connected to output circuit board 40. Furthermore, the output circuit board 20 and the second end 332 of winding 33 may not overlap.

[0095] Figure 6 This is a schematic diagram showing the connection between the windings, power circuit board, and output circuit board in the prior art. Please refer to... Figure 6As shown in the diagram, the winding is A, the second end of the winding is A1, the power circuit board is B, the output circuit board is C, and the cable is D. In the prior art, the second end of the winding is connected to the power circuit board, and the power circuit board and the output circuit board are connected by a cable. That is, the AC power output from the second end of the winding is first transmitted to the power circuit board, and then transmitted from the power circuit board to the output circuit board via the cable. This means that the connection between the second end of the winding and the power circuit board, the connection between the cable and the power circuit board, and the connection between the cable and the output circuit board all require connection structures. Therefore, a total of three connection structures are needed for the transmission of AC power from the second end of the winding to the output circuit board; and the AC power needs to pass through three connection structures to be transmitted from the second end of the winding to the output circuit board.

[0096] Furthermore, in existing technologies, all the AC current output from the second end of the winding needs to be transmitted to the power circuit board. After the high-frequency current is filtered out on the power circuit board, the low-frequency current is transmitted from the power circuit board to the output circuit board. Since only a small portion of the AC current output from the second end of the winding is high-frequency current and the majority is low-frequency current, the high-frequency current is small and the low-frequency current is large. When the AC current (high-frequency current + low-frequency current) is transmitted from the second end of the winding to the power circuit board, both high-frequency and low-frequency currents need to be transmitted. Therefore, a high-current cable is needed to connect the second end of the winding to the power circuit board. Similarly, a large low-frequency current needs to be transmitted from the power circuit board to the output circuit board. This results in a huge space occupation and thus an increased size of the power conversion device.

[0097] In this application, the second end 332 of the winding 33 is connected to the power circuit board 20 via the first cable 34, and the second end 332 of the winding 33 is also connected to the output circuit board 40 via the second cable 36. Therefore, the connection between the first cable 34 and the power circuit board 20 (i.e., the connection between the second end 332 of the winding 33 and the power circuit board 20) and the connection between the second cable 36 and the output circuit board 40 requires two connection structures, eliminating the need for a transfer between the power circuit board 20 and the output circuit board 40, thus reducing the number of connection structures. The AC power transmitted from the second end 332 of the winding 33 to the output circuit board 40 requires passing through two connection structures. It is evident that this application uses one fewer connection structure than the prior art, resulting in a lower cost for the power conversion device. Furthermore, the more connection structures there are, the higher the probability of failure. A failure in any one of the multiple connection structures will affect the transmission of AC power. Since the AC power in this application is transmitted from the second end 332 of the winding 33 to the output circuit board 40 without passing through the first connection structure, the power conversion device of this application has higher reliability.

[0098] Furthermore, in this application, the second end 332 of the winding 33 is connected to the power circuit board 20 via the first cable 34. Only a low-frequency current needs to be transmitted to the power circuit board 20, and the second end 332 of the winding 33 is connected to the output circuit board 40 via the second cable 36 to transmit a low-frequency current. Therefore, the second cable 36 only needs to be a high-current cable, while the first cable 34 can be a thinner low-current cable. Additionally, the first cable 34 and the power circuit board 20 can be connected via a smaller connection structure, which is sufficient to transmit a low-frequency current, further reducing the cost of the power conversion device. Simultaneously, because the connection structure between the first cable 34 and the power circuit board 20 is smaller, the area of ​​the power circuit board 20 can be smaller; or, more electrical components can be arranged on the power circuit board 20, thus increasing the power density of the power circuit board 20.

[0099] In summary, this application, through the combined design of conductive connector 32, first cable 34, and second cable 36, can reduce the area of ​​power circuit board 20 while ensuring the reliability of the power conversion device, and at the same time reduce the size and cost.

[0100] The connection structure in this application may include an OT terminal, a saddle terminal, and a screw. The OT terminal is connected to the end of the cable, and the saddle terminal may be disposed on a circuit board (power circuit board 20, output circuit board 40). The OT terminal and the saddle terminal are connected by screws.

[0101] The inductor 30 described above includes two windings 33, such as... Figure 5 As shown, in some examples, the inductor 30 includes two second cables 36; one end of each second cable 36 is connected to the second end 332 of a winding 33, and the other end of each second cable 36 is connected to the output circuit board 40. This connects the second ends 332 of both windings 33 to the output circuit board 40.

[0102] To reduce the number of connection points between the second cable 36 and the power circuit board 20, in some examples, the other ends of the two second cables 36 are interconnected and then connected to the output circuit board 40. This reduces the number of connection points between the two second cables 36 and the output circuit board 40 to one, simplifying the structure of the power conversion device and increasing its power density.

[0103] To enable the two first cables 34 to be interconnected at the ends furthest from the inductor 30 and connected to the power circuit board 20, such as... Figure 4 As shown, in some examples, the power conversion device also includes a second terminal 37 that connects the ends of two second cables 36 away from the winding 33, and the second terminal 37 is connected to the output circuit board 40.

[0104] The limitation of the second terminal 37 in this embodiment is the same as the limitation of the first terminal 35 mentioned above, and will not be repeated here.

[0105] The second cable 36 is used to transmit AC power to the output circuit board 40; therefore, in some examples, the second cable 36 is a low-frequency cable.

[0106] Because the power circuit is placed on the power circuit board 20 and the output circuit is placed on the output circuit board 40 in this application, the power circuit and the output circuit are physically separated. This avoids the digital switching noise of the power circuit from polluting the analog signal of the output circuit. In other words, the electromagnetic interference experienced by the output circuit board 40 is already very small. Even if the second cable 36 is set as a low-frequency cable, the electromagnetic interference experienced by the second cable 36 is also very small, which can ensure the stability of the AC waveform transmitted by the second cable 36. Moreover, the second cable 36 is inexpensive, which also reduces the cost of the power conversion device.

[0107] High-frequency cables operate at high frequencies and experience rapid signal attenuation, typically requiring thinner conductors; low-frequency cables, on the other hand, need to carry larger currents or lower-loss low-frequency signals, and therefore generally have thicker wire diameters. Consequently, the high-frequency cable in this application has a thinner wire diameter compared to the low-frequency cable.

[0108] After the conductive connector 32 is connected to the power circuit board 20, the power circuit board 20 will exert a force on the conductive connector 32. The greater the manufacturing tolerance and / or assembly tolerance, the greater the force exerted by the power circuit board 20 on the conductive connector 32. Since the first end 331 of the winding 33 and the conductive connector 32 are typically connected by welding or other methods, excessive force on the conductive connector 32 will damage the connection between the first end 331 of the winding 33 and the conductive connector 32. Therefore, if... Figure 4 or Figure 5 As shown, in some examples, the carrier plate 31 extends from the side away from the winding 33 toward the power circuit board 20 and is provided with a support base 312, and the conductive connector 32 is connected to the side of the support base 312 away from the carrier plate 31.

[0109] A support base 312 is provided on the carrier plate 31, and a conductive connector 32 is placed on the support base 312 to support the support base 312. Part of the force applied by the power circuit board 20 to the conductive connector 32 will be transmitted to the support base 312, and then to the carrier plate 31 through the support base 312; thus reducing the force applied by the power circuit board 20 to the conductive connector 32, thereby protecting the connection between the conductive connector 32 and the first end 331 of the winding 33.

[0110] The inductor 30 described above includes two windings 33 and two conductive connectors 32. In some examples, there are two support bases 312. The first end 331 of each winding 33 is connected to a conductive connector 32. Each support base 312 has a conductive connector 32 fixed on the side facing away from the support plate 31.

[0111] To simplify the structure of inductor 30, such as Figure 4 or Figure 5 As shown, in some examples, the two support bases 312 are integrated. Thus, one support base 312 simultaneously supports two conductive connectors 32, simplifying the structure of the inductor 30.

[0112] The conductive connector 32 is used to connect the power circuit board 20. To achieve both the fixed connection and electrical connection between the conductive connector 32 and the power circuit board 20, such as... Figure 4 As shown, in some examples, the power circuit board 20 is provided with pads, the support base 312 is provided with threaded holes, the pads are provided with first through holes 21 along the thickness direction a of the carrier plate 31, and the conductive connector 32 is provided with second through holes 321; the power conversion device also includes a connector 50, which passes through the first through hole 21 and the second through hole 321 and is connected to the threaded hole.

[0113] The pads on the power circuit board 20 are connected to the printed lines on the power circuit board 20. The conductive connector 32 is electrically connected to the pads, that is, the conductive connector 32 is connected to the printed lines on the power circuit board 20. In this embodiment, the pads can be set as through-hole pads. The through-hole pads have metallized through holes in the middle (as the first through hole 21 in this application), the hole walls are plated with copper, and there are annular copper foils on the upper and lower sides. The conductive connector 32 directly contacts the annular copper foil on the side of the power circuit board 20 facing the carrier plate 31. The current on the power circuit board 20 is transmitted to the pads, and then transmitted to the conductive connector 32 through the connector 50, so as to realize the fixed connection and electrical connection between the conductive connector 32 and the power circuit board 20.

[0114] The conductive connector 32 is provided with a second through hole 321. Along the thickness direction a of the support plate 31, the first through hole 21 and the second through hole 321 coincide. After the connector 50 passes through the first through hole 21 and the second through hole 321 and connects with the hole wall of the threaded hole, the connector 50 and the hole wall of the threaded hole fix the power circuit board 20 and the conductive connector 32 together.

[0115] In other examples, a nut is provided inside the support base 312, and when the power circuit board 20 and the conductive connector 32 are connected, the connector 50 passes through the first through hole 21 on the power circuit board 20 and the second through hole 321 on the conductive connector 32 and is connected to the fastener.

[0116] In this application, the connector 50 can be a bolt, and the fastener can be a nut, with the bolt and nut connected by threads.

[0117] When a nut is provided on the support base 312, in some examples, the side of the support base 312 facing the power circuit board 20 has a groove, a fastener is disposed in the groove, and the fastener can move along the depth direction of the groove within the groove. There is a gap between the outer wall of the fastener and the side wall of the groove, which allows the fastener to move perpendicular to the thickness direction a of the bearing plate 31 within the groove, but the gap is insufficient to allow the fastener to rotate within the groove. For example, the fastener is provided as a hexagonal nut, and the groove is correspondingly provided as a regular hexagonal groove, with a gap between the side wall of the hexagonal nut and the side wall of the regular hexagonal groove.

[0118] Thus, the first end 331 of the winding 33 is directly connected to the power circuit board 20 through the conductive connector 32, while the second end 332 of the winding 33 is connected to the power circuit board 20 through the first cable 34.

[0119] In some examples, the conductive connector 32 includes a first segment, a second segment, and a third segment connected in sequence. The first and third segments extend perpendicularly to the thickness direction 'a' of the support plate 31, and their extension directions are opposite. The second segment extends parallel to the thickness direction 'a' of the support plate 31. In this case, the conductive connector 32 is Z-shaped. The first segment is connected to the side of the support base 312 facing away from the support plate 31, the second segment extends along the height direction of the support base 312, and the third segment is connected to the first end 331 of the winding 33. The conductive connector 32 is provided with a second through hole 321 and a card interface 322. In this application, the first segment has the second through hole 321, and the third segment has the card interface 322.

[0120] Figure 7 This is a schematic diagram of the structure of an inductor provided in an embodiment of this application.

[0121] In this application Figure 2 The DC / AC circuit diagram shown is used to convert direct current to single-phase alternating current. Inverter 200 typically outputs three-phase alternating current, meaning inverter 200 includes three... Figure 2 The DC / AC circuit shown. Therefore, as Figure 7 As shown, in some examples, there are multiple inductors 30. For example, when the inverter 200 outputs three-phase AC power, there are three inductors 30, and when the inverter 200 outputs two-phase AC power, there are two inductors 30.

[0122] like Figure 7As shown, in some examples, multiple carrier plates 31 of multiple inductors 30 are integrally arranged. Integrating multiple carrier plates 31 of multiple inductors 30 reduces the number of components comprising the inductor 30 and improves the integration of the inductor 30. Furthermore, multiple conductive connectors 32 are disposed on the same carrier plate 31, facilitating and making the assembly of the inductors 30 easier.

[0123] Figure 8 This is a schematic diagram of another inductor structure provided in an embodiment of this application.

[0124] To achieve protection for inductor 30, such as Figure 7 or Figure 8 As shown, in some examples, the inductor 30 also includes a housing 39, the winding 33 is disposed inside the housing 39, the carrier plate 31 and the conductive connector 32 are disposed outside the housing 39, the housing 39 is disposed outside the outer shell 10, and the housing 39 and the outer shell 10 are connected.

[0125] To improve heat dissipation for the 30 inductor, such as Figure 7 or Figure 8 As shown, in some examples, the outer surface of the housing 39 is provided with heat dissipation fins 391. The heat dissipation fins 391 have a larger surface area, so the heat dissipation fins 391 and the surrounding air have a larger heat exchange area, which can accelerate the heat dissipation efficiency of the inductor 30.

[0126] In some examples, a filler layer is provided between the winding 33 and the inner wall of the housing 39. This filler layer fills the gap between the outer surface of the inductor 30 and the inner wall of the housing 39, forming a protective layer on the outer surface of the winding 33. This isolates the winding 33 from the external environment, more effectively preventing the intrusion of dust, moisture, and other contaminants, thereby improving the reliability and service life of the winding 33—in other words, the winding 33 has higher protection performance. Furthermore, the filler layer can fix the winding 33, preventing it from loosening due to vibration or impact, thus improving the reliability and stability of the winding 33.

[0127] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0128] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any modifications or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power conversion device, characterized in that, The power conversion device includes a housing, an inductor, a power circuit board, and an output circuit board, wherein both the power circuit board and the output circuit board are disposed within the housing; wherein... The power circuit board is equipped with a power circuit, which is used to convert direct current to alternating current. The output circuit board is located on the side of the power circuit board away from the inductor; the AC power converted by the power circuit is output through the second circuit board; The inductor includes a carrier plate, windings, a first cable, a second cable, and conductive connectors; Along the thickness direction of the support plate, the winding and the conductive connector are disposed on opposite sides of the support plate; Along the thickness direction of the carrier plate, the power circuit board is disposed on the side of the conductive connector away from the carrier plate; The winding has a first end and a second end. The first end of the winding passes through the carrier plate and is connected to the conductive connector. The conductive connector is fixed and electrically connected to the power circuit board. The second end of the winding is connected to one end of the first cable and one end of the second cable. The other end of the first cable is connected to the power circuit board, and the other end of the second cable is connected to the output circuit board. Along the thickness direction of the carrier plate, the orthographic projection of the conductive connector on the power circuit board is within the outline of the power circuit board; along the thickness direction of the carrier plate, the power circuit board and the second end of the winding do not overlap.

2. The power conversion device according to claim 1, characterized in that, The inductor includes two first cables, two windings, and two conductive connectors. The first end of each winding is connected to a conductive connector, the second end of each winding is connected to one end of a first cable, and the other ends of the two first cables are connected to each other and then connected to the power circuit board.

3. The power conversion device according to claim 2, characterized in that, The power conversion device further includes a first terminal block, which connects to the ends of the two first cables away from the winding, and the first terminal block is connected to the power circuit board.

4. The power conversion device according to any one of claims 1-3, characterized in that, The first cable is a high-frequency cable.

5. The power conversion device according to any one of claims 1-4, characterized in that, The inductor includes two second cables, two windings, and two conductive connectors. The first end of each winding is connected to a conductive connector, the second end of each winding is connected to one end of a second cable, and the other ends of the two second cables are connected to each other and then connected to the output circuit board.

6. The power conversion device according to claim 5, characterized in that, The power conversion device further includes a second terminal block, which connects to the ends of the two second cables away from the winding, and the second terminal block is connected to the output circuit board.

7. The power conversion device according to any one of claims 1-6, characterized in that, The second cable is a low-frequency cable.

8. The power conversion device according to any one of claims 1-7, characterized in that, Along the thickness direction of the support plate, the support plate is provided with clearance holes that penetrate both opposite sides of the support plate; the first end of the winding passes through the clearance holes and is connected to the conductive connector.

9. The power conversion device according to any one of claims 1-8, characterized in that, The support plate extends from the side opposite to the winding toward the power circuit board and is provided with a support base, and the conductive connector is connected to the side of the support base opposite to the support plate.

10. The power conversion device according to claim 9, characterized in that, Fasteners are provided on the support base; Along the thickness direction of the carrier plate, the power circuit board is provided with a first through hole, and the conductive connector is provided with a second through hole; The power conversion device further includes a connector that passes through the first through hole and the second through hole and is connected to the fastener.

11. The power conversion device according to any one of claims 1-10, characterized in that, The number of inductors is multiple, and the multiple carrier plates of the multiple inductors are integrally arranged.

12. The power conversion device according to any one of claims 1-11, characterized in that, The support plate is a metal plate.

13. The power conversion device according to any one of claims 1-12, characterized in that, The output circuit board and the second end of the winding do not overlap.

14. An inductor, characterized in that, An inductor is used in a power conversion device having a power circuit board and an output circuit board, the inductor comprising a carrier plate, windings, a first cable, a second cable, and conductive connectors; Along the thickness direction of the support plate, the winding and the conductive connector are disposed on opposite sides of the support plate; The winding has a first end and a second end. The first end of the winding passes through the carrier plate and is connected to the conductive connector. The conductive connector is connected to the power circuit board. The second end of the winding is connected to one end of the first cable and one end of the second cable. The other end of the first cable is connected to the power circuit board, and the other end of the second cable is connected to the output circuit board.

Images