Power converter

Abstract

The utility model provides a power converter. The power converter comprises a shell, a first PCB, a second PCB, a power module, an inductor and a capacitor. Wherein the shell is used for accommodating the first PCB, the second PCB, the power module, the inductor and the capacitor; the power module is fixed on the first PCB and is used for converting direct current from the photovoltaic module or the energy storage battery into alternating current; the inductor is fixed on the first PCB, the capacitor is fixed on the second PCB, the alternating current output end of the power module is electrically connected with the capacitor through the inductor, and the inductor and the capacitor are used for electromagnetic interference EMI filtering. According to the power converter, rapid replacement of the capacitor is facilitated, the first PCB and the second PCB are connected through the inductor, the connection structure is simplified, and the space utilization rate of the first PCB is increased.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a power converter. Background Art

[0002] Usually, the size and load weight of a single printed circuit board (PCB) are limited. When there are many components to be connected, two or more printed circuit boards are usually used to install the components and to connect two adjacent PCB boards across the board.

[0003] For two adjacent PCB boards, current-passing terminals (connecting terminals used for fixing and capable of conducting electricity) are installed on the two PCB boards respectively, and electronic wires or copper busbars are used to connect to the current-passing terminals on the two PCB boards respectively to achieve cross-board connection.

[0004] However, the current-carrying terminals usually occupy a large PCB board area, squeezing out the installation space of the PCB board. Utility Model Content

[0005] The present application provides a power converter. The power converter includes a housing, a first PCB, a second PCB, a power module, an inductor and a capacitor. The housing is used to accommodate the first PCB, the second PCB, the power module, the inductor and the capacitor. The power module is fixed to the first PCB and is used to convert the direct current from the photovoltaic module or the energy storage battery into alternating current. The inductor is fixed to the first PCB, the capacitor is fixed to the second PCB, the AC output end of the power module is electrically connected to the capacitor through the inductor, and the inductor and the capacitor are used for electromagnetic interference EMI filtering.

[0006] In the present application, the capacitor is installed on the second PCB. On the one hand, it can avoid the size and load design problems of the PCB caused by the large number of components installed on the first PCB, which is conducive to the size optimization design of the first PCB. On the other hand, in the AC EMI filtering design, it is necessary to debug the coordination of the capacitor and the inductor to select the specifications of the capacitor with better AC EMI filtering effect. Therefore, the capacitor is installed on the second PCB alone. In the filter debugging device, the second PCB with capacitors of different specifications can be directly replaced without disassembling the capacitors individually, which can improve the replacement efficiency of the capacitors and reduce the risk of damage to the capacitors during the replacement process. On the other hand, during the operation of the power converter, the capacitor is more easily damaged than the inductor. Therefore, the capacitor is installed on the second PCB alone. When the capacitor is damaged, the second PCB can be directly replaced to improve the maintenance efficiency when the capacitor is damaged.

[0007] In addition, in the present application, the AC output end of the power module is electrically connected to the capacitor through an inductor, so that the power module and the capacitor can be connected with the help of the inductor, thereby reducing the use of conductive wires or copper bars connecting the first PCB and the second PCB, and at least reducing the use of current-carrying terminals that fix the conductive wires or copper bars to the first PCB, thereby avoiding the current-carrying terminals occupying space on the first PCB, saving the installation space of the first PCB, and helping to improve the space utilization of the first PCB.

[0008] In some possible implementations, the inductor includes a magnetic core and an inductor winding, the inductor winding is wound around the magnetic core along the axial direction of the magnetic core, the size of the inductor winding along the axial direction of the magnetic core is smaller than the size of the inductor winding along the radial direction of the magnetic core. One end of the inductor winding is fixed to the first PCB, and the other end of the inductor winding is electrically connected to the second PCB.

[0009] In this implementation, one end of the inductor winding is directly fixedly connected to the first PCB, and the other end of the inductor winding is reused as a cross-board connection line to be electrically connected to the second PCB, thereby reducing the use of current-passing terminals on the first PCB and reducing the use of electronic wires or copper bars connecting the first PCB and the second PCB, thereby saving the installation space of the circuit board and reducing the assembly process. In addition, the inductor winding is a flat wire, which can increase the self-inductance and mutual inductance coefficient of the inductor, thereby improving the AC EMI filtering effect under the joint action of the inductor and the capacitor. Among them, the size of the inductor winding along the axial direction of the magnetic core is designed to be smaller, which can increase the number of turns of the inductor winding in the axial direction of the magnetic core, thereby improving the utilization rate of the winding space on the magnetic core.

[0010] In some possible implementations, the power converter further includes an electrical connector, one end of which is connected to the other end of the inductor winding, and the other end of the electrical connector is connected to the second PCB. The end surface of one end of the electrical connector is aligned with the end surface of the other end of the inductor winding and fixedly connected.

[0011] In this implementation, the other end of the inductor winding is connected to the second PCB through an electrical connector, so that when the second PCB is replaced, only the electrical connection between the electrical connector and the second PCB needs to be removed, which can avoid damage to the other end of the inductor winding, thereby reducing the risk of damage to the inductor winding. In addition, the connection distance between the first PCB and the second PCB can be extended by the electrical connector 7, and the structural stability connected to the second PCB can be improved by the electrical connector. The end face of one end of the electrical connector is aligned with the end face of the other end of the inductor winding, which can improve the stability of the electrical connection between the electrical connector and the inductor winding, thereby improving the electrical connection performance between the inductor and the capacitor, which is beneficial to the stability of AC EMI filtering.

[0012] In some possible implementations, the other end of the electrical connector is a flat structure and is attached to the second PCB.

[0013] In this implementation, by designing the other end of the electrical connector to be a flat structure, the surface area of ​​the other end of the electrical connector in contact with the second PCB is increased, which is conducive to improving the stability of the connection between the other end of the electrical connector and the second PCB. In addition, reducing the size of the other end of the electrical connector in a direction perpendicular to the mounting surface of the second PCB is conducive to the stability of clamping and fixing the other end of the electrical connector on the second PCB.

[0014] In some possible implementations, the hardness of the electrical connector is less than the hardness of the inductor winding.

[0015] In this implementation, on the one hand, the flexibility of the electrical connector can be used to adapt to the position tolerance between the first PCB and the second PCB, which is beneficial to the installation of the second PCB. On the other hand, during the operation of the power converter, the electrical connector can resist the vibration of the power inductor during operation through its own deformation, thereby reducing or even avoiding the pulling between the inductor winding and the second PCB, which is beneficial to the stability of the electrical connection between the inductor and the capacitor. On the other hand, it is beneficial to flatten the two ends of the electrical connector in different directions so that the two ends of the electrical connector present a flat structure to adapt to the other end of the inductor winding and the different positions of the second PCB relative to the first PCB.

[0016] In some possible implementations, the inductor further includes a base, and the base includes a bearing portion and a supporting portion. The bearing portion is located between the magnetic core and the first PCB, one side of the bearing portion is fixedly connected to the magnetic core, and the other side of the bearing portion is spaced apart from the first PCB, and one end of the inductor winding passes through the bearing portion and is fixed to the first PCB. The supporting portion is disposed between the bearing portion and the first PCB, and the supporting portion is used to fix the base to the first PCB.

[0017] In this implementation, the magnetic core is fixedly connected by the bearing part, and the bearing part and the second PCB are fixedly connected by the supporting part, so that the bearing part can hold the magnetic core, and the supporting part and one end of the inductor winding can jointly support the entire inductor, which can improve the installation stability of the inductor on the first PCB. The other side of the bearing part is spaced apart from the first PCB, so that there is a gap between the bearing part and the first PCB. The connection state between one end of the inductor winding and the first PCB can be observed through the gap between the bearing part and the first PCB, which is beneficial to the welding control in the process of connecting one end of the inductor winding to the first PCB, so as to better connect one end of the inductor winding and the first PCB. In addition, it is also beneficial to observe the connection state between one end of the inductor winding and the first PCB during subsequent maintenance and inspection, so as to timely determine whether the connection needs to be reinforced.

[0018] In some possible implementations, the axial direction of the magnetic core is parallel to the mounting surface of the first PCB. The bearing portion includes a plate body and at least two spacer plates, the plate body is located between the magnetic core and the first PCB, at least two spacer plates are fixed to a side of the plate body facing the magnetic core, and are used to fix and connect the magnetic core, and two adjacent spacer plates are spaced apart to accommodate part of the inductor winding.

[0019] In this implementation, the magnetic core is fixedly connected by providing a spacer plate, and part of the inductor winding is accommodated by the space between two adjacent spacers to avoid structural interference between the inductor winding and the bearing part.

[0020] In some possible implementations, the inductor winding includes a live wire and a neutral wire. The partition plate is made of insulating material and is used to separate the live wire from the neutral wire.

[0021] In this implementation, the live wire and the neutral wire are separated by a partition plate, which can reduce interference between the live wire and the neutral wire, thereby improving the working stability of the inductor.

[0022] In some possible implementations, the bearing portion includes a first portion and a second portion, the first portion is fixedly connected to the magnetic core, the other end of the inductor winding extends from the first portion in a direction pointing to the second portion, and the support portion is disposed on the second portion.

[0023] In this implementation, since the direction of the inductor winding affects the overall center of gravity position of the inductor winding and the magnetic core, the overall center of gravity of the inductor winding and the magnetic core will be biased toward the second part. By setting the support part on the second part, the support part can support the overall center of gravity deviation of the inductor winding and the magnetic core, thereby improving the overall center of gravity stability of the inductor, and further improving the stability of the inductor installed on the first PCB. Therefore, setting the support part on the second part can make the inductor have better stability, avoiding the problem of tearing or falling off of one end of the inductor winding caused by shaking when the inductor is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an application scenario of the power converter provided by the present application in some embodiments;

[0025] Figure 2 yes Figure 1 The circuit topology diagram of the power converter in some embodiments is shown;

[0026] Figure 3A yes Figure 1 A schematic diagram of a part of the structure of the power converter shown;

[0027] Figure 3B yes Figure 3A A partial structural exploded schematic diagram of the power converter shown;

[0028] Figure 3C yes Figure 3A The schematic diagram of the partial structure of the power converter shown is cut away at AA;

[0029] Figure 4 yes Figure 3A A schematic diagram of the structural decomposition of the inductor in the power converter shown;

[0030] Figure 5A yes Figure 3A A schematic diagram of an orthographic projection of a support portion and one end of an inductor winding on a load-bearing portion in a power converter in some embodiments;

[0031] Figure 5B yes Figure 3A Schematic diagram of the support portion in the circuit board and the orthographic projection of the inductor winding on the load-bearing portion in some embodiments. DETAILED DESCRIPTION

[0032] Please refer to Figure 1 , Figure 1 This is an application scenario of the power converter 10 provided in this application in some embodiments.

[0033] In some embodiments, the power converter 10 is used to convert direct current from the photovoltaic module 20 or the energy storage battery into alternating current.

[0034] In one example, one end of the power converter 10 is connected to the photovoltaic module 20, and the other end is connected to the load 30. The photovoltaic module 20 is used to convert light energy into electrical energy and output direct current. The power converter 10 is used to convert the direct current output by the photovoltaic module 20 into alternating current, and output the alternating current to the load 30 for use by the load 30. The power converter 10 is a photovoltaic inverter.

[0035] In another example, one end of the power converter is connected to the energy storage battery, and the other end is connected to the load. The energy storage battery stores electrical energy and is used to output direct current. The power converter is used to convert the direct current output by the energy storage battery into alternating current, and output the alternating current to the load for use by the load. In addition, the power converter can also be connected between the power grid and the energy storage battery to convert the alternating current of the power grid into direct current, and output the direct current to the energy storage battery for the energy storage battery to store electrical energy. The power converter is a power storage converter (Power Conversion System, PCS).

[0036] Please refer to Figures 1 to 3A , Figure 2 yes Figure 1 The circuit topology diagram of the power converter in some embodiments is shown; Figure 3A yes Figure 1A schematic diagram of part of the structure of the power converter shown.

[0037] In some embodiments, the power converter 10 includes a housing 1, a first PCB 2, a second PCB 3, a power module 4, an inductor 5, and a capacitor 6. The housing 1 is used to accommodate the first PCB 2, the second PCB 3, the power module 4, the inductor 5, and the capacitor 6. The power module 4 is fixed to the first PCB 2, and is used to convert the direct current from the photovoltaic module 20 or the energy storage battery into alternating current. The inductor 5 is fixed to the first PCB 2, and the capacitor 6 is fixed to the second PCB 3. The AC output terminal of the power module 4 is electrically connected to the capacitor 6 through the inductor 5.

[0038] Among them, the inductor 5 and the capacitor 6 form a combination of Figure 2 The AC electromagnetic interference (EMI) filter shown, the inductor 5 and the capacitor 6 are used for AC EMI filtering to filter the AC power output by the power module 4, thereby reducing or even eliminating the electromagnetic interference of the power converter 10 on the AC side, which is beneficial for the power converter 10 to stably output AC power to the load 30.

[0039] The inductor 5 is a common-mode inductor for suppressing common-mode interference, or the inductor 5 is a differential-mode inductor for suppressing differential-mode interference.

[0040] The capacitor 6 is a safety capacitor, which can prevent electric shock caused by failure and is used to prevent users from getting electric shock.

[0041] In this embodiment, the capacitor 6 is installed on the second PCB3. On the one hand, it can avoid the size and load design problems of the PCB caused by the large number of components installed on the first PCB2, which is conducive to the size optimization design of the first PCB2. On the other hand, in the AC EMI filtering design, it is necessary to debug the coordination of the capacitor 6 and the inductor 5 to select the specifications of the capacitor 6 with better AC EMI filtering effect. Therefore, the capacitor 6 is installed on the second PCB3 alone. In the filter debugging device, the second PCB3 with capacitors 6 of different specifications can be directly replaced without disassembling the capacitor 6 individually, which can improve the replacement efficiency of the capacitor 6 and reduce the risk of damage to the capacitor 6 during the replacement process. On the other hand, during the operation of the power converter 10, the capacitor 6 is more easily damaged than the inductor 5. Therefore, the capacitor 6 is installed on the second PCB3 alone. When the capacitor 6 is damaged, the second PCB3 can be directly replaced, which improves the maintenance efficiency when the capacitor 6 is damaged.

[0042] In addition, in the present embodiment, the AC output end of the power module 4 is electrically connected to the capacitor 6 via the inductor 5, so that the power module 4 and the capacitor 6 can be connected with the help of the inductor 5, thereby reducing the use of the conductive wire or copper busbar connecting the first PCB2 and the second PCB3, and at least reducing the use of the conductive wire or copper busbar fixed to the current-passing terminal of the first PCB2, thereby avoiding the current-passing terminal from occupying space on the first PCB2, saving the installation space of the first PCB2, and facilitating improving the space utilization rate of the first PCB2.

[0043] It should be noted that the current-passing terminal is a connection terminal used to be fixed on the PCB, and plays the role of fixing the conductive wire or copper busbar on the PCB.

[0044] Exemplarily, the power converter 10 further includes a DC EMI filter, which is mounted on the first PCB 2 and is used to filter the DC power input to the DC input terminal of the power converter 10 to improve the stability of the DC power transmitted to the power module 4 .

[0045] The power converter 10 further includes an LCL filter, which is mounted on the first PCB 2 and connected to the AC output terminal of the power module 4 , and is used to eliminate harmonics and DC components in the AC power output by the power module 4 .

[0046] In this embodiment, the DC input terminal of the power converter 10 (see Figure 2 PV+ and PV-) in the PV module 20 or the energy storage battery are electrically connected to receive the DC power of the PV module 20 or the energy storage battery. After the DC power passes through the DC circuit breaker, it is filtered by the DC EMI filter and transmitted to the power module 4. The power module 4 converts the DC power into AC power and outputs the AC power to the LCL filter for filtering. After the AC power is filtered by the LCL filter, the AC power is transmitted to the AC EMI filter for filtering through the AC side contactor. After the AC EMI filter is filtered, the AC power passes through the AC side circuit breaker and is output from the AC output terminal of the power converter 10 (see Figure 2 A, B, C) in the output are output to the load 30.

[0047] Please refer to FIG. 3B to FIG. 4 , Figure 3B yes Figure 3A A partial structural exploded schematic diagram of the power converter shown; Figure 3C yes Figure 3A The schematic diagram of the partial structure of the power converter shown is cut away at AA; Figure 4 yes Figure 3A Schematic diagram of the structural decomposition of the inductor in the power converter shown.

[0048] In some embodiments, the inductor 5 includes a magnetic core 51, an inductor winding 52 and a base 53, wherein the inductor winding 52 surrounds the magnetic core 51 along the axial direction of the magnetic core 51. The base 53 is disposed between the magnetic core 51 and the first PCB 2, and the base 53 is used to support the inductor 5. One end of the inductor winding 52 passes through the base and is fixed to the first PCB 2, and the other end of the inductor winding 52 is fixedly connected to the second PCB 3.

[0049] In this embodiment, one end of the inductor winding 52 is directly fixedly connected to the first PCB2, and the other end of the inductor winding 52 is reused as a cross-board connection line to be electrically connected to the second PCB3, thereby reducing the use of the current-passing terminal on the first PCB2 and the use of the electronic wire or copper busbar connecting the first PCB2 and the second PCB3, thereby saving the installation space of the circuit board and reducing the assembly process. In addition, by providing the base 53, support can be provided for the inductor 5 to maintain the installation stability of the inductor 5.

[0050] One end of the inductor winding 52 can be welded to the first PCB 2 to be fixedly connected and electrically connected to the first PCB 2. In this embodiment, since only one end of the inductor winding 52 is welded to the first PCB 2, compared with the traditional on-board inductor, the risk of tearing at the welding point between one end of the inductor winding 52 and the first PCB 2 is reduced.

[0051] The base 53 can be fixedly connected to the magnetic core 51 by bonding the magnetic core 51 .

[0052] Exemplarily, the size of the inductor winding 52 along the axial direction of the magnetic core 51 is smaller than the size of the inductor winding 52 along the radial direction of the magnetic core 51 .

[0053] In this embodiment, the inductor winding 52 is a flat wire, which can improve the self-inductance and mutual inductance of the inductor 5, thereby improving the AC EMI filtering effect under the combined action of the inductor 5 and the capacitor 6. Among them, the size of the inductor winding 52 along the axial direction of the magnetic core 51 is designed to be smaller, which can increase the number of turns of the inductor winding 52 in the axial direction of the magnetic core 51, thereby improving the utilization rate of the winding space on the magnetic core 51.

[0054] Exemplarily, the power converter 10 further includes an electrical connector 7 , one end of which is connected to the other end of the inductor winding 52 , and the other end of which is electrically connected to the second PCB 3 .

[0055] In this embodiment, the other end of the inductor winding 52 is connected to the second PCB 3 through the electrical connector 7, so that when the second PCB 3 is replaced, only the electrical connection between the electrical connector 7 and the second PCB 3 needs to be removed, which can avoid damage to the other end of the inductor winding 52, thereby reducing the risk of damage to the inductor winding 52. In addition, the electrical connector 7 can extend the connection distance between the first PCB 2 and the second PCB 3, and the electrical connector 7 can improve the structural stability of the connection to the second PCB 3.

[0056] The end surface of one end of the electrical connector 7 is aligned with the end surface of the other end of the inductor winding 52 and fixedly connected. Specifically, one end of the electrical connector 7 is a flat structure, so that the shape of the end surface of one end of the electrical connector 7 is similar to the shape of the end surface of the other end of the inductor winding 52. The end surface of one end of the electrical connector 7 is aligned with the end surface of the other end of the inductor winding 52, and fixedly connected by welding.

[0057] In this embodiment, the end face of one end of the electrical connector 7 is aligned with the end face of the other end of the inductor winding 52, which can improve the stability of the electrical connection between the electrical connector 7 and the inductor winding 52, thereby improving the electrical connection performance between the inductor 5 and the capacitor 6, which is beneficial to the stability of AC EMI filtering.

[0058] The other end of the electrical connector 7 is a flat structure and fits with the second PCB 3. Specifically, the thickness direction of the other end of the electrical connector 7 is perpendicular to the mounting surface of the second PCB 3, so that the flat surface of the other end of the electrical connector 7 fits on the second PCB 3.

[0059] In this embodiment, by designing the other end of the electrical connector 7 to be a flat structure, the surface area of ​​the other end of the electrical connector 7 in contact with the second PCB 3 is increased, which is conducive to improving the stability of the connection between the other end of the electrical connector 7 and the second PCB 3. In addition, reducing the size of the other end of the electrical connector 7 in a direction perpendicular to the mounting surface of the second PCB 3 is conducive to the stability of clamping and fixing the other end of the electrical connector 7 on the second PCB 3.

[0060] The power converter 10 further includes a through-current terminal 8, which is mounted on the second PCB 3 and is used to fix the other end of the electrical connector 7 to the second PCB 3. Specifically, the through-current terminal 8 includes a detachable fixed structure and a detachable structure, the fixed structure is fixed to the second PCB 3, the detachable structure can be detachably connected with the fixed structure, and the detachable structure can fix the other end of the electrical connector 7 to the fixed structure.

[0061] In this embodiment, the current-passing terminal 8 can realize a detachable connection between the other end of the electrical connector 7 and the second PCB3, thereby improving the efficiency of disassembling the second PCB3 and reducing the damage to the electrical connector 7 during the disassembly of the second PCB3, thereby reducing the loss of the electrical connector 7 caused by replacing the second PCB3.

[0062] The hardness of the electrical connector 7 is smaller than the hardness of the inductor winding 52 , so that the electrical connector 7 can improve the fault tolerance space of the connection between the first PCB 2 and the second PCB 3 .

[0063] On one hand, the flexibility of the electrical connector 7 can be used to adapt to the position tolerance between the first PCB 2 and the second PCB 3 , thereby facilitating the installation of the second PCB 3 .

[0064] On the other hand, during the operation of the power converter 10, the electrical connector 7 can resist the vibration of the power inductor 5 during operation by its own deformation, thereby reducing or even avoiding the pulling between the inductor winding 52 and the second PCB 3, which is beneficial to the stability of the electrical connection between the inductor 5 and the capacitor 6.

[0065] On the other hand, it is beneficial to flatten the two ends of the electrical connector 7 in different directions so that the two ends of the electrical connector 7 present a flat structure to adapt to the other end of the inductor winding 52 and the different positions of the second PCB3 relative to the first PCB2.

[0066] Exemplarily, the inductor 5 is disposed on an edge of the first PCB 2 close to the second PCB 3 .

[0067] In this embodiment, the first PCB2 and the second PCB3 are spaced apart, and the inductor 5 is disposed at the edge of the first PCB2 close to the second PCB3, so that the distance between the inductor 5 and the second PCB3 can be shortened, which can shorten the distance of the inductor 5 connecting the first PCB2 and the second PCB3 across the board to reduce the difficulty of connecting the first PCB2 and the second PCB3 across the board, and can also reduce the spatial position of the first PCB2 occupied by the inductor 5 when connecting the first PCB2 and the second PCB3 across the board, thereby improving the space utilization rate of the first PCB2.

[0068] The mounting surface of the first PCB2 can be parallel, perpendicular, or intersecting with the mounting surface of the second PCB3, etc., and the design is specifically based on actual application requirements and is not strictly limited here. For example, the first PCB2 and the second PCB3 are mounted on the same inner wall of the housing, or the first PCB2 and the second PCB3 are mounted on two adjacent inner walls of the housing.

[0069] Exemplarily, the base 53 includes a bearing portion 531 and a supporting portion 532. The bearing portion 531 is located between the magnetic core 51 and the first PCB 2, one side of the bearing portion 531 is fixedly connected to the magnetic core 51, and one end of the inductor winding 52 passes through the bearing portion 531 and is fixed to the first PCB 2. The supporting portion 532 is disposed between the bearing portion 531 and the first PCB 2, and is used to fix the base 53 to the first PCB 2.

[0070] In this embodiment, the magnetic core 51 is fixedly connected by the bearing portion 531, and the bearing portion 531 and the second PCB3 are fixedly connected by the supporting portion 532, so that the bearing portion 531 can support the magnetic core 51, and the supporting portion 532 and one end of the inductor winding 52 can jointly support the entire inductor 5, which can improve the installation stability of the inductor 5 on the first PCB2.

[0071] Among them, the other side of the bearing portion 531 is spaced from the first PCB2 so that there is a gap between the bearing portion 531 and the first PCB2. The connection state between one end of the inductor winding 52 and the first PCB2 can be observed through the gap between the bearing portion 531 and the first PCB2, which is conducive to welding control during the process of connecting one end of the inductor winding 52 to the first PCB2, so as to better connect one end of the inductor winding 52 and the first PCB2. In addition, it is also conducive to observing the connection state between one end of the inductor winding 52 and the first PCB2 during subsequent maintenance and inspection, so as to timely determine whether the connection needs to be reinforced.

[0072] Exemplarily, the axial direction of the magnetic core 51 is parallel to the mounting surface of the first PCB 2. The bearing portion 531 includes a plate body 5311 and at least two spacer plates 5312. The plate body 5311 is located between the magnetic core 51 and the first PCB 2. At least two spacer plates 5312 are fixed to a side of the plate body 5311 facing the magnetic core 51, and are used to fix and connect the magnetic core 51. Two adjacent spacer plates 5312 are spaced apart to accommodate part of the inductor winding 52.

[0073] In this embodiment, the magnetic core 51 is fixedly connected by providing a spacer plate 5312 , and a portion of the inductor winding 52 is accommodated in the space between two adjacent spacers 5312 to avoid structural interference between the inductor winding 52 and the supporting portion 531 .

[0074] The inductor winding 52 includes a live wire and a neutral wire. The partition plate 5312 is made of insulating material and is used to separate the live wire and the neutral wire.

[0075] In this embodiment, the live wire and the neutral wire are separated by the spacer 5312, which can reduce the interference between the live wire and the neutral wire, thereby improving the working stability of the inductor 5.

[0076] It should be noted that the number of live wires may be one or more, for example Figure 4 As shown, there are three live wires and one neutral wire, and the inductor 5 can constitute a three-phase four-wire inductor. When there are multiple live wires, the spacer 5312 can also separate two adjacent live wires to reduce interference between the two adjacent live wires.

[0077] The plate body 5311 has a through hole, and the through hole is arranged between two adjacent spacer plates 5312, so that one end of the inductor winding 52 can pass through the plate body 5311 through the through hole to be fixedly connected to the first PCB 2. The number of through holes can be the same as the number of windings in the inductor winding 52, so that one end of each winding can pass through the plate body 5311 through a through hole to be fixedly connected to the first PCB 2.

[0078] In some other embodiments, the axial direction of the magnetic core 51 is perpendicular to the mounting surface of the first PCB 2 , and the bearing portion 531 does not need to be provided with a spacer structure.

[0079] Please refer to Figures 4 to 5B , Figure 5A yes Figure 3A Schematic diagram of the support portion 532 and the orthographic projection of one end of the inductor winding 52 on the bearing portion 531 in the power converter 10 in some embodiments; Figure 5B yes Figure 3A Schematic diagram of the orthographic projection of the support portion 532 and the inductor winding 52 on the bearing portion 531 in some embodiments.

[0080] In some embodiments, the bearing portion 531 includes a first portion 531a and a second portion 531b connected to each other, wherein the first portion 531a is fixedly connected to the magnetic core 51, and the supporting portion 532 is disposed on the second portion 531b. One end of the inductor winding 52 passes through the first portion 531a and is connected to the first PCB2.

[0081] In this embodiment, one end of the inductor winding 52 and the support portion 532 are designed to be located in different parts of the bearing portion 531, so that one end of the inductor winding 52 and the support portion 532 are fixed to different areas of the first PCB2, which is beneficial for one end of the inductor winding 52 and the support portion 532 to jointly support the inductor 5, so as to maintain the stability of the inductor 5 installed on the first PCB2.

[0082] Exemplarily, the other end of the inductor winding 52 extends from the first portion 531 a to the second portion 531 b .

[0083] In this embodiment, since the direction of the inductor winding 52 affects the overall center of gravity position of the inductor winding 52 and the magnetic core 51, the overall center of gravity of the inductor winding 52 and the magnetic core 51 will be biased toward the second part 531b, and the support portion 532 is arranged on the second part 531b, so that the support portion 532 can support the overall center of gravity deviation of the inductor winding 52 and the magnetic core 51, thereby improving the overall center of gravity stability of the inductor 5, and further improving the stability of the inductor 5 installed on the first PCB 2. Therefore, by arranging the support portion 532 on the second part 531b, the inductor 5 can have better stability, and avoid problems such as tearing or falling off of one end of the inductor winding 52 caused by shaking when the inductor 5 is working.

[0084] It should be noted that Figure 4 In the embodiment, the dotted line is a schematic diagram of the division between the first part 531a and the second part 531b of the bearing portion 531. Figure 4 The embodiment does not strictly limit the division of the first part 531a and the second part 531b of the bearing portion 531. In some other embodiments, the first part 531a and the second part 531b of the bearing portion 531 may also be divided in other ways.

[0085] Exemplary (see Figure 5A ), there are multiple supporting parts 532, and the orthographic projections of the multiple supporting parts 532 on the bearing part 531 are arranged nonlinearly with the orthographic projections of one end of the inductor winding 52 on the bearing part 531. In other words, the multiple fixed points where the multiple supporting parts 532 are fixedly connected to the bearing part 531 and the first PCB 2 are arranged nonlinearly with the fixed point where one end of the inductor winding 52 is fixedly connected to the first PCB 2, so that the multiple supporting parts 532 and one end of the inductor winding 52 together form a stable support for the inductor 5 as a whole, thereby improving the structural stability of the inductor 5.

[0086] Exemplary (see Figure 5B ), the orthographic projection of the support portion 532 on the base 53 is spaced apart from the orthographic projection of the inductor winding 52 on the base 53.

[0087] In this embodiment, the support portion 532 is arranged away from the inductor winding 52 so that when the inductor 5 is installed on the first PCB 2, the installation support portion 532 will not be interfered by the inductor winding 52, which is beneficial to improving the efficiency of fixing the inductor 5 and thus saving installation time cost.

[0088] It should be noted that the inductor winding 52 of the inductor 5 is reused as a cross-board connection line in the embodiment of the present application for illustrative purposes only, and does not strictly limit the application of the inductor 5. The inductor 5 provided in the present application can be applied to any two PCBs that need to be connected, and one of the PCBs needs to be set as a board inductor, such as a switching power supply, a power storage converter (Power Conversion System, PCS), a vehicle inverter, etc.

[0089] In some other embodiments, the inductor 5 can also use the inductor winding 52 to connect the PCB and other devices. For example, the inductor 5 can bridge the PCB and the through-wall terminal, wherein one end of the inductor winding 52 is installed on the first PCB, and the other end of the inductor winding 52 is electrically connected to the through-wall terminal, which is beneficial to simplify the connection between the power converter 10 and the through-wall terminal, thereby improving the disassembly and assembly efficiency of the power converter 10 and the through-wall terminal.

[0090] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of the present application. In other words, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0091] It should be noted that all the above drawings are illustrative illustrations of the present application and do not represent the actual size of the product. Moreover, the size ratio relationship between the components in the drawings is not intended to limit the actual product of the present application.

[0092] The above are only some embodiments and implementation methods of the present application, and the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the technical scope disclosed in the present application can easily think of changes or substitutions, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A power converter, characterized in that: It includes a housing, a first PCB, a second PCB, a power module, an inductor and a capacitor; wherein, The housing is used to accommodate the first PCB, the second PCB, the power module, the inductor and the capacitor; The power module is fixed to the first PCB and is used to convert direct current from the photovoltaic module or the energy storage battery into alternating current; The inductor is fixed to the first PCB, the capacitor is fixed to the second PCB, the AC output end of the power module is electrically connected to the capacitor through the inductor, and the inductor and the capacitor are used for electromagnetic interference EMI filtering.

2. The power converter according to claim 1, characterized in that The inductor comprises a magnetic core and an inductor winding, wherein the inductor winding surrounds the magnetic core along the axial direction of the magnetic core, and the size of the inductor winding along the axial direction of the magnetic core is smaller than the size of the inductor winding along the radial direction of the magnetic core; One end of the inductor winding is fixed to the first PCB, and the other end of the inductor winding is electrically connected to the second PCB.

3. The power converter according to claim 2, characterized in that: The power converter further comprises an electrical connector, one end of which is connected to the other end of the inductor winding, and the other end of which is connected to the second PCB; The end surface of one end of the electrical connection is aligned with the end surface of the other end of the inductor winding and fixedly connected.

4. The power converter according to claim 3, characterized in that: The other end of the electrical connector is a flat structure and is attached to the second PCB.

5. The power converter according to claim 4, characterized in that: The hardness of the electrical connector is smaller than the hardness of the inductor winding.

6. The power converter according to any one of claims 2 to 5, characterized in that: The inductor further includes a base, and the base includes a bearing portion and a supporting portion; The bearing portion is located between the magnetic core and the first PCB, one side of the bearing portion is fixedly connected to the magnetic core, the other side of the bearing portion is spaced apart from the first PCB, and one end of the inductor winding passes through the bearing portion and is fixed to the first PCB; The support portion is disposed between the bearing portion and the first PCB, and the support portion is used to fix the base to the first PCB.

7. The power converter according to claim 6, characterized in that: The axial direction of the magnetic core is parallel to the mounting surface of the first PCB; The bearing portion includes a plate body and at least two spacer plates, the plate body is located between the magnetic core and the first PCB, at least two of the spacer plates are fixed to a side of the plate body facing the magnetic core, and are used to fix the magnetic core, and two adjacent spacer plates are spaced apart to accommodate part of the inductor winding.

8. The power converter according to claim 7, characterized in that: The inductor winding includes a live wire and a neutral wire; The partition plate is made of insulating material and is used to separate the live wire and the neutral wire.

9. The power converter according to claim 6, characterized in that: The bearing portion includes a first portion and a second portion, the first portion is fixedly connected to the magnetic core, the other end of the inductor winding extends from the first portion to the direction of the second portion, and the support portion is disposed at the second portion.

Images