A power converter and power supply system

Abstract

The application provides a power converter and a power supply system, which are applied to the technical field of power converters and the power converter comprises a direct-current interface, a circuit board, a direct-current switch and a power conversion circuit, the circuit board carries a detection circuit and comprises an electric energy transmission layer and a shielding layer, the electric energy transmission layer is provided with an electric energy transmission circuit and a first grounding module, the direct-current interface is connected with the direct-current switch and the power conversion circuit in sequence through the electric energy transmission circuit, and the first grounding module is grounded, since the electric energy transmission circuit is insulated from the first grounding module, the first grounding module does not affect the normal operation of the power converter, when lightning strikes, the lightning breaks the insulation between the electric energy transmission circuit and the first grounding module, discharges through the first grounding module, rapidly releases the energy of the lightning, the shielding body of the shielding layer is at the same potential as the detection circuit, and the excessively high potential difference can be avoided to break the insulation of the detection circuit and the circuit board, and the safety of the detection circuit and the circuit board is effectively ensured.

Description

Technical Field

[0001] This application relates to the field of power converter technology, specifically to a power converter and power supply system. Background Technology

[0002] With the continuous development of new energy technologies, different types of power converters are widely used in new energy power supply systems. Taking photovoltaic power supply systems as an example, photovoltaic modules are connected to photovoltaic inverters. As a power converter, the photovoltaic inverter includes a DC interface, a circuit board, a DC switch, a surge protection device, and a power conversion circuit. The circuit board is used to carry the detection circuit for realizing the preset detection function.

[0003] When the DC switch is closed, if the photovoltaic power supply system is struck by lightning, the surge protection device will activate and protect the circuit boards and power conversion circuits inside the photovoltaic inverter from damage. However, in practical applications, the DC switch may be in the open state. If the photovoltaic power supply system is struck by lightning at this time, the surge protection device will not be able to protect the circuit board, causing the circuit board and its detection circuit to fail, the photovoltaic inverter to malfunction, and affecting the normal operation of the power supply system. Summary of the Invention

[0004] In view of this, this application aims to provide a power converter and power supply system to solve the problem that the lightning protection device of the existing power converter fails when the DC switch is open, and lightning strikes may cause the circuit board and the detection circuit carried by the circuit board to fail, affecting the normal operation of the power supply system.

[0005] In a first aspect, this application provides a power converter, comprising: a DC interface, a circuit board, a DC switch, and a power conversion circuit, wherein... The circuit board carries a detection circuit for implementing a preset detection function, and the circuit board includes a power transmission layer and a shielding layer. The power transmission layer is provided with a power transmission line and a first grounding module. The power transmission line is insulated from the first grounding module. The shielding layer is provided with a shielding body. The DC interface is connected to one end of the DC switch via the power transmission line, and the other end of the DC switch is connected to the power conversion circuit. The shield is connected to the detection circuit and is at the same potential as the detection circuit; The first grounding module is grounded to release the electrical energy of the lightning when lightning breaks down the insulation between the power transmission line and the first grounding module.

[0006] In one alternative embodiment, the projection of the detection circuit in the direction perpendicular to the shielding layer overlaps with the shielding body, and the area of ​​the shielding body is greater than or equal to the area of ​​the projection.

[0007] In one alternative embodiment, the shielding body comprises a metal shielding plate or a metal shielding mesh.

[0008] In one alternative implementation, the detection circuit includes multiple circuits, and the shielding body includes at least one. Each of the shields is connected to at least one of the detection circuits.

[0009] In one alternative implementation, the shield is directly or indirectly connected to the detection circuit.

[0010] In one alternative embodiment, the circuit board further includes a first insulating layer and a second insulating layer, wherein, The first insulating layer is located between the power transmission layer and the shielding layer; The second insulating layer is located between the shielding layer and the detection circuit.

[0011] In one optional implementation, a preset insulation distance is provided between the first grounding module and the power transmission line. The preset insulation distance meets the safety requirements of the power converter, and when the power converter is struck by lightning, the lightning can break down the insulating medium within the preset insulation distance range.

[0012] In an optional embodiment, the power converter provided in the first aspect of this application further includes: a housing, wherein, The housing is provided with a second grounding module, and the second grounding module is grounded; The first grounding module is connected to the second grounding module.

[0013] In one optional embodiment, the power transmission line includes a first connection point, a second connection point, and a conductor, wherein, The first connection point is located at one end of the wire and is used to connect to the DC interface; The second connection point is located at the other end of the conductor and is used to connect the DC switch.

[0014] In one optional implementation, the power conversion circuit includes: a DC / DC conversion circuit; Alternatively, a DC / AC converter circuit; Alternatively, DC / DC converter circuits and DC / AC converter circuits.

[0015] In one optional embodiment, the power converter provided in the first aspect of this application further includes a surge protection device, wherein the DC switch and the power conversion circuit have a connection point, and the surge protection device is connected to the connection point.

[0016] In one optional embodiment, the detection circuit includes a temperature detection circuit, which includes a temperature sensor, wherein... The temperature sensor is mounted on the circuit board to collect the temperature of the DC interface.

[0017] In a second aspect, this application provides a power supply system, including: a power converter as described in any of the first aspects of this application.

[0018] Based on the above, the power converter provided in this application includes a DC interface, a circuit board, a DC switch, and a power conversion circuit. The circuit board carries a detection circuit and includes a power transmission layer and a shielding layer. The power transmission layer is provided with a power transmission line and a first grounding module. The DC interface is connected to the DC switch and the power conversion circuit in sequence via the power transmission line. The first grounding module is grounded. Since the power transmission line is insulated from the first grounding module, the first grounding module will not affect the normal operation of the power converter. In the event of a lightning strike, the lightning breaks down the insulation between the power transmission line and the first grounding module, and discharges through the first grounding module, rapidly releasing the energy of the lightning. At the same time, the shielding body of the shielding layer is at the same potential as the detection circuit, which can prevent excessively high potential differences from breaking down the insulation of the detection circuit and the circuit board, effectively ensuring the safety of the detection circuit and the circuit board. Therefore, the power converter provided in this application can still ensure that the circuit board and the detection circuit are protected from lightning strikes even if the DC switch is disconnected, improving the reliability and safety of the power converter and the power supply system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a power converter provided by related technologies.

[0021] Figure 2 This is a schematic diagram of the structure of a power converter provided in an embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the structure of a circuit board provided in an embodiment of this application.

[0023] Figures 4a-4b This is a schematic diagram of the shielding structure provided in the embodiments of this application.

[0024] Figure 5This is a schematic diagram of another circuit board structure provided in an embodiment of this application.

[0025] Figure 6 This is a schematic diagram of another power converter provided in an embodiment of this application.

[0026] Figure 7 This is a schematic diagram of the external shape of a power converter provided in an embodiment of this application.

[0027] Figure 8 This is a schematic diagram of another power converter provided in the embodiments of this application. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] See Figure 1 As shown, the power connectors commonly used in photovoltaic (PV) power supply systems consist of two parts: wire-end connectors and board-end connectors. The PV modules are connected to the wire-end connectors, while the board-end connectors, serving as the DC interface of the PV inverter, can be plugged into the wire-end connectors. Furthermore, the DC interface of the PV inverter is also connected to the internal power conversion circuitry. Therefore, when building a PV power supply system, simply plugging in the wire-end connectors and board-end connectors connects the PV modules to the PV inverter. In practical applications, the AC side of the PV inverter is connected to the primary side of the step-up transformer, and the secondary side of the step-up transformer is connected to the AC power grid. Based on this connection, the PV modules utilize the photovoltaic effect to convert light energy into DC power, which is then inverted by the PV inverter and output as AC power to the step-up transformer. The step-up transformer then boosts the AC power according to the grid connection requirements, ultimately providing the AC power to the grid that meets the grid connection requirements.

[0030] A photovoltaic inverter, as a power converter in a photovoltaic power supply system, includes a circuit board, a DC switch, a surge protection device, and a power conversion circuit. The circuit board is identified as a PCB (Printed Circuit Board). The DC interface (i.e., the board-end connector) is connected to the DC switch via the circuit board. The circuit board is used to carry the detection circuit for implementing preset detection functions. Of course, it is also used to transmit the electrical energy output from the photovoltaic modules to the power conversion circuit. As for the detection circuit, its specific detection function will vary depending on the specific needs of the power converter. For example, the detection circuit can be a temperature detection circuit to detect the temperature of the DC interface. Or, the detection circuit can be a voltage detection circuit to detect the operating voltage of the DC interface.

[0031] based on Figure 1 As shown, the DC switch is used to connect or disconnect the DC interface and the power conversion circuit. It is understood that when the DC switch is closed, if the photovoltaic power supply system is struck by lightning, the surge protection device will activate, protecting the circuit boards, detection circuits, and power conversion circuits inside the photovoltaic inverter from damage. However, in practical applications, the DC switch may be in the open state. If the photovoltaic power supply system is struck by lightning at this time, the surge protection device cannot provide effective protection, leading to the failure of the circuit boards and their detection circuits, causing the photovoltaic inverter to malfunction and affecting the normal operation of the power supply system.

[0032] To address the aforementioned issues, this application provides a power converter with a circuit board comprising a power transmission line, a shield, and a first grounding module. The first grounding module is grounded, and in the event of a lightning strike, the lightning discharges through the first grounding module, rapidly releasing its energy. Simultaneously, the shield and the detection circuit are at the same potential, preventing excessive potential difference from damaging the insulation of the detection circuit and the circuit board. Even if the DC switch is disconnected, the circuit board and the detection circuit can still be protected from lightning strikes, improving the reliability and safety of the power converter and the power supply system.

[0033] Based on the above, see Figure 2 The power converter provided in this application embodiment includes a DC interface 10, a circuit board 20, a DC switch, a power conversion circuit 30, and a detection circuit 40, wherein at least one DC switch is provided. Figure 2 In the embodiment shown, DC switches S1-Sn are used as examples, where n≥1.

[0034] One end of the DC interface 10 is connected to the subsequent circuit board 20, and the other end of the DC interface 10 is used to connect to a DC power supply. Figure 2As shown, the DC interface 10 is illustrated using a board-side connector as an example. Of course, in practical applications, depending on the DC power supply connected, the DC interface of the power converter can be implemented in other ways, which will not be detailed here. The DC power supply mentioned in this embodiment can be the aforementioned photovoltaic module, an energy storage battery, or other DC power supplies that can provide DC power and need to be converted by a power converter. This application does not limit the specific selection of the DC power supply.

[0035] In practical applications, a power converter can be equipped with at least one DC interface 10, and each DC interface 10 is used to connect at least one DC power supply. The specific number of DC interfaces 10 can be determined based on the specific application scenario and design specifications of the power converter.

[0036] The circuit board 20 is used to carry the detection circuit 40 that implements the preset detection function. That is, the detection circuit 40 is disposed on the circuit board 20. As mentioned above, the detection circuit 40 can correspond to various implementation methods depending on the specific detection function it implements. This application does not limit this.

[0037] Furthermore, the circuit board 20 includes a power transmission layer and a shielding layer, wherein the power transmission layer is provided with power transmission lines ( Figure 2 (Not shown in the image) and the first grounding module 210, and the power transmission line is insulated from the first grounding module 210, and the shielding layer is provided with a shielding body ( Figure 2 (Not shown in the text).

[0038] As an alternative implementation, the circuit board 20 can be adopted as follows: Figure 3 The structure shown, combined with Figure 3 As shown, the circuit board 20 includes a power transmission layer, a first insulating layer, a shielding layer, and a second insulating layer, each layer being configured according to... Figure 3 The layers shown in the first direction are stacked sequentially. The detection circuit 40 is disposed on top of the second insulating layer, the shielding layer is located between the second insulating layer and the first insulating layer, and the first insulating layer is located between the shielding layer and the power transmission layer. In practical applications, the first and second insulating layers are made based on insulating materials. The insulating materials used can be at least one of epoxy resin, silicone rubber, insulating ceramics, and glass. Of course, other materials that meet the insulation requirements can also be used, which will not be detailed here.

[0039] Based on the circuit board manufacturing process, it is understood that the power transmission layer and shielding layer mentioned in this embodiment also include insulating materials. In practical applications, the same insulating materials as the first and second insulating layers can be used. The difference is that the power transmission layer has at least one power transmission line 230 and at least one first grounding module 210 disposed within the insulating material, and any first grounding module 210 is insulated from any power transmission line 230. Figure 3 As shown, a preset insulation distance D is spaced between the first grounding module 210 and the power transmission line 230. In this embodiment, the preset insulation distance D is required to meet both the safety requirements of the power converter, ensuring that the power transmission line 230 and the first grounding module 210 are mutually insulated under the working environment limited by the design parameters of the power converter, so that the power converter can operate normally, and the requirement that when the power converter is struck by lightning, the lightning can successfully break through the insulating medium within the preset insulation distance D, so that the first grounding module 210 and the power transmission line 230 are in a connected state.

[0040] It is also understandable that, since the power transmission layer is equipped with insulating material to meet the insulation requirements between charged bodies, power transmission lines and other electrical components other than the first grounding module, such as capacitors, sensors, and resistors, can also be installed on the power transmission layer. These electrical components are connected by laying copper wires on the power transmission layer to construct circuits for specific functions. Of course, regardless of how these electrical components are arranged, the insulation distance requirements between the aforementioned power transmission lines and the first grounding module should be ensured. By arranging electrical components on the power transmission layer, the layout space of the power transmission layer can be fully utilized, further improving the utilization rate of the circuit board and helping to improve the integration of the power converter.

[0041] Combination Figure 3 As shown, in one optional implementation, the power transmission line 230 includes a first connection point, a second connection point, and a conductor. The first connection point is located at one end of the conductor and is connected to a DC interface. The second connection point is located at the other end of the conductor and is used to connect to a downstream DC switch. It is understood that the first connection point, the second connection point, and the conductor are all made of conductive materials. In practical applications, the conductive material used can be at least one of copper and aluminum. Of course, other conductive materials can also be selected, which will not be listed here. It should be noted that... Figure 3In the illustrated embodiment, both the first and second connection points are shown as bosses. In practical applications, the first and second connection points can also be implemented using other methods besides bosses to facilitate the connection of the power transmission line 230 to external circuits, which will be described in detail here. Based on the specific implementation of the first connection point, the DC interface and the first connection point of the power transmission line 230 can be connected in various ways, such as by welding, plugging, or fastening bolts. In addition, the DC interface can be directly connected to the first connection point, or it can be connected to the first connection point after passing through a connecting wire of one end length.

[0042] Furthermore, the shielding body 220 is disposed within the shielding layer. In an optional embodiment, the shielding body 220 may be adopted as follows: Figure 4a The metal shielding plate shown is made from a single piece of metal sheet. In another optional embodiment, the shielding body 220 can also be made of, for example... Figure 4b The metal shielding mesh shown can, of course, have various mesh structures to choose from, including... Figure 4b The rectangular mesh shown can also be a circular mesh, or other types of mesh structures can be chosen, which will not be detailed here. As for the material of the shield 220, at least one of copper and aluminum can be used, or other conductive materials can be chosen.

[0043] Based on the above, the DC interface 10 is connected to one end of the power transmission line (i.e., Figure 3 The first connection point shown is connected to the other end of the power transmission line (i.e., the first connection point shown). Figure 3 The second connection point shown is connected to one end of the DC switch, the other end of the DC switch is connected to the power conversion circuit, and the first grounding module 210 of the circuit board 20 is grounded.

[0044] The shield 220 is connected to the detection circuit 40 to be at the same potential as the detection circuit 40. It can be understood that in practical applications, the shield 220 can be connected to either the power supply terminal or the ground terminal of the detection circuit 40, as long as they are at the same potential. Figure 3 As shown, in one optional implementation, the shield 220 is directly connected to the detection circuit 40. In another optional implementation, the shield 220 can also be indirectly connected to the detection circuit 40, as shown in the figure. Figure 5 As shown, the shield 220 is connected to the detection circuit 40 through other circuits in the power converter. That is, the shield 220 is connected to other circuits, and the other circuits are connected to the detection circuit 40. As for the other circuits mentioned here, they can be selected in combination with the specific implementation of the power converter, as long as the shield 220 and the detection circuit 40 are at the same potential. This application does not limit the specific selection of other circuits.

[0045] Based on the above connection, if the power converter is not struck by lightning, the power transmission line is insulated from the first grounding module and will not affect the normal operation of the power converter. If the DC switch is closed at this time, the DC power output from the DC power supply can pass through the power transmission line on the circuit board and the DC switch in sequence to enter the power conversion circuit, and the power converter will operate normally.

[0046] In the event of a lightning strike on the power converter, if the DC switch is in the open state, the power converter provided in this embodiment can ensure the safety of the circuit board 20 and the detection circuit 40 in two ways. First, the lightning breaks down the insulation between the power transmission line 230 and the first grounding module 210. At this time, there is a path for releasing the lightning energy, namely the DC interface 10, the power transmission line 230 (passing through the first connection point, the wire and the second connection point in sequence) and the first grounding module 210. The lightning energy can be quickly released to the ground through this path. Second, the shield 220 and the detection circuit 40 are at the same potential, and there is no potential difference between them. When a lightning strike occurs, it can prevent the excessive potential difference from breaking down the insulation of the detection circuit 40 and the circuit board 20. The shield 220 can also play an electromagnetic shielding role, preventing the detection circuit from coupling with the aforementioned discharge path in electric or magnetic fields, thereby ensuring the safety of the detection circuit 40 and the circuit board 20.

[0047] As an optional implementation, the power converter provided in this embodiment is also equipped with a lightning protection device 50, combined with... Figure 2 As shown, the surge protection device 50 is connected to the connection point of the DC switch and the power conversion circuit 30. If the power converter is struck by lightning, the surge protection device 50 can protect the safety of the DC switch and the power conversion circuit 30 when the DC switch is closed. Of course, it can also provide an additional layer of safety for the circuit board 20 and the detection circuit 40.

[0048] As mentioned above, the power converter provided in this application embodiment has a shielding body on the circuit board connected to the detection circuit. The electromagnetic shielding effect of the shielding body protects the detection circuit when struck by lightning. Based on the principle of electromagnetic shielding, it is known that in order to fully utilize the electromagnetic shielding effect of the shielding body, combined with... Figure 3 As shown, the detection circuit 40 is arranged opposite to the shield 220, that is, the projection of the detection circuit 40 in the direction perpendicular to the shield layer overlaps with the shield 220, and the area of ​​the shield 220 is greater than or equal to the area of ​​the projection, so as to ensure that the shield 220 can provide electromagnetic shielding for the detection circuit 40 and ensure the safety of the detection circuit 40.

[0049] As an optional implementation, the power converter provided in this application embodiment is further provided with a controller 60, combined with... Figure 2 As shown, the controller 60 is connected to the output terminal of the detection circuit 40, receives the detection signal fed back by the detection circuit 40, and executes the corresponding control function according to the obtained detection signal. As for the specific function of the controller 60, it can be implemented with reference to relevant technologies, and will not be described in detail here.

[0050] In summary, the power converter provided in this application embodiment, when struck by lightning, breaks down the insulation between the power transmission line and the first grounding module, and the energy of the lightning is rapidly released through the discharge of the first grounding module. At the same time, the shielding layer is at the same potential as the detection circuit, which can prevent excessive potential difference from breaking down the insulation of the detection circuit and the circuit board, effectively ensuring the safety of the detection circuit and the circuit board. Even if the DC switch is disconnected, the circuit board and the detection circuit can still be protected from the impact of lightning strikes, improving the reliability and safety of the power converter and the power supply system.

[0051] This application also provides another power converter, see [link to example]. Figure 6 As shown in the embodiment of this application, the power converter also includes a housing 70 and a second grounding module 80.

[0052] Specifically, in combination Figure 6 As shown, the circuit board 20, power conversion circuit 30, detection circuit 40, lightning protection device 50, controller 60, and DC switch are all housed inside the housing 70. The second grounding module 80 is located on the side wall of the housing 70 and is grounded. The first grounding module 210 on the circuit board 20 is connected to the second grounding module 80 and grounded through the second grounding module 80. This arrangement satisfies the grounding requirements of the first grounding module 210, ensuring a path for energy release in the event of a lightning strike. At the same time, the unified grounding through the second grounding module 80 on the housing 70 simplifies the structure of the housing 70 and the installation process of the power converter on site, thus improving deployment efficiency.

[0053] It is understandable that when the first grounding module is grounded through the second grounding module, the discharge path for releasing lightning energy is: DC interface, power transmission line, first grounding module and second grounding module. The lightning passes through the aforementioned parts in sequence and is finally conducted to the ground by the second grounding module, ensuring the safety of the power converter.

[0054] In this embodiment, the DC interface 10 of the power converter is shown as a board-end connector. As mentioned earlier, the power connectors in the photovoltaic power supply system include wire-end connectors and board-end connectors. The wire-end connector is used to connect to the DC power supply, and the board-end connector is used to connect to the internal circuitry of the power converter. To facilitate the insertion of the wire-end connector and the board-end connector, the DC interface (i.e., the board-end connector) can be exposed on the outside of the housing 70. Based on this, multiple through holes can be provided on the side wall of the housing 70. The board-end connector passes through the corresponding through holes, with one end inside the housing 70 and connected to the power transmission line, and the other end outside the housing 70 and inserted into the wire-end connector. Furthermore, sealing material can be filled in the gap between the through holes and the board-end connector to ensure the sealing effect of the housing 70. The shape of the power converter with the housing can be seen in [reference needed]. Figure 7 As shown.

[0055] As an optional implementation, the first grounding module and the second grounding module can be implemented in the same way. For example, they can be implemented by grounding bolts. Of course, other implementation methods that can achieve the grounding function can also be selected.

[0056] In summary, the power converter provided in this embodiment includes a housing and a second grounding module disposed on the side wall of the housing. The circuit board, DC switch, and power conversion circuit are all disposed inside the housing. The housing prevents the components from directly contacting the external environment, thus avoiding the impact of the external environment on the stable operation of the components inside the housing and effectively preventing electric shock accidents. The first grounding module on the circuit board is grounded through the second grounding module, which not only meets the grounding requirements of the first grounding module and ensures a path for energy release in the event of a lightning strike, but also simplifies the housing structure and the installation process of the power converter in the field, helping to improve deployment efficiency.

[0057] It should be noted that in any of the power converters provided in the foregoing embodiments, multiple DC switches can be provided. Correspondingly, the circuit board is provided with multiple power transmission lines. Each DC switch is connected to a board-end connector through one power transmission line, and then connected to a DC power supply with a wired connector through the board-end connector. The other end of the DC switch is connected to the power conversion circuit. The internal structure of the power converter shown in the foregoing figures is only to clearly illustrate the improvements of this application to the power converter. Other configurations of the power converter, such as the specific selection of DC switches and surge protection devices, and the specific functions of the controller, can be implemented with reference to related technologies. This application does not limit these aspects.

[0058] It is understandable that the DC interface connects to a DC power supply, and the DC power output from the DC power supply is transmitted to the subsequent power conversion circuit through the power transmission line of the circuit board. Due to its own impedance, the temperature of the DC interface and the power transmission line will inevitably rise. Excessive temperature may not only reduce the insulation performance of the power converter, but may even cause a fire. Therefore, as an optional implementation, the detection circuit mentioned in the above embodiments can be a temperature detection circuit to collect the temperature of the DC interface. Based on Figure 3 As shown in the circuit board structure, the temperature detection circuit is located on the second insulating layer, and the power transmission line is located on the power transmission layer. A first insulating layer, a shielding layer, and a second insulating layer are spaced between the temperature detection circuit and the power transmission line. Based on this, the heat generated by the power transmission line during the transmission of DC power will be transferred sequentially through the first insulating layer, the shielding layer, and the second insulating layer before it can be collected by the temperature detection circuit. The temperature collection of the power transmission line by the temperature detection circuit is an indirect collection. Since the power transmission line is directly connected to the DC interface, the temperature of the power transmission line can be approximately regarded as equal to the temperature of the DC interface. Therefore, the temperature collected by the temperature detection circuit is taken as the temperature of the DC interface, realizing the indirect collection of the DC interface temperature.

[0059] Specifically, the temperature detection circuit includes a temperature sampling circuit and a temperature sensor. The temperature sensor is in contact with the circuit board and collects the temperature of the DC interface through the circuit board. The input terminal of the temperature sampling circuit is connected to the temperature sensor and collects the detection information fed back by the temperature sensor. The output terminal of the temperature sampling circuit is connected to the controller and feeds back the obtained detection information to the controller. The controller can determine the current temperature of the DC interface based on the obtained detection information.

[0060] In practical applications, the temperature sampling circuit can be connected to multiple temperature sensors. Each temperature sensor collects the temperature of at least one DC interface and transmits the corresponding detection information to the temperature sampling circuit. Alternatively, if sufficient circuit board area is available, each temperature sensor can collect the temperature of only one DC interface, which is also feasible. In another optional implementation, the temperature sampling circuit can be multi-channel, with each temperature sampling circuit connected to at least one temperature sensor. The specific implementation of the temperature sampling circuit can be found in relevant technologies and will not be detailed here. It should be noted that, considering that each temperature sensor is mounted on the second insulating layer of the circuit board, sufficient spacing should be maintained between the temperature sensors to avoid mutual interference during the temperature acquisition process, ensuring the reliability and accuracy of the temperature acquisition results.

[0061] Furthermore, the temperature sensor can be selected from temperature detection devices such as thermistors and infrared temperature sensors. The thermistor can be selected from those whose resistance changes in the positive direction with temperature or those whose resistance changes in the negative direction with temperature. This application does not limit the specific selection of the temperature sensor.

[0062] It should be noted that when multiple temperature sensors are set in the temperature detection circuit, the shielding body set in the circuit board shielding layer can be a whole with the same area as the circuit board, or it can be divided into multiple shielding bodies of different areas. When it is divided into multiple shielding bodies, each shielding body is used to provide shielding protection for at least one temperature sensor. As for the specific number of shielding bodies and the number of temperature sensors corresponding to each shielding body, it can be determined according to the actual situation, and this application does not make specific limitations in this regard.

[0063] Based on the foregoing, the power converters provided in various embodiments of this application all include a power conversion circuit. Since the power conversion functions of the power converters differ, the specific implementation of the power conversion circuits will also vary. In one optional embodiment, the power conversion circuit includes a DC / DC conversion circuit for converting direct current power. In another optional embodiment, the power conversion circuit includes a DC / AC conversion circuit for converting direct current to alternating current power. In yet another optional embodiment, the power conversion circuit includes both a DC / DC conversion circuit and a DC / AC conversion circuit, and the secondary conversion of electrical power is completed through the cooperation of the DC / DC conversion circuit and the DC / AC conversion circuit.

[0064] The following is based on Figure 8 Taking the power converter shown as an example, the specific implementation of the power converter is described in detail. In the power converter provided in this embodiment, the power conversion circuit includes at least one DC / DC conversion circuit and a DC / AC conversion circuit. One side of the DC / DC conversion circuit is connected to a DC switch, and the other side of the DC / DC conversion circuit is connected to the DC side of the DC / AC conversion circuit. The AC side of the DC / AC conversion circuit is used to connect to the AC power grid. Based on the aforementioned connection relationship, the DC / DC conversion circuit converts the DC power output from the DC power supply to provide DC power that meets the operating requirements of the DC / AC conversion circuit. The DC / AC conversion circuit inverts the DC power into AC power and finally outputs it to the AC power grid. It can be understood that the power converter provided in this embodiment is an inverter.

[0065] Furthermore, in practical applications, the power conversion circuit can also be a bus circuit or a boost circuit. By configuring different power conversion circuits, the power converter can achieve different functions. Of course, other circuits can also be selected for the power conversion circuit, which will not be detailed here. As long as they do not exceed the core idea of ​​this application, they also fall within the scope of protection of this application.

[0066] This application also provides a power supply system, including the power converter provided in any of the foregoing embodiments.

[0067] Those skilled in the art will understand that the contents disclosed herein can be varied and modified in many ways. For example, the various devices or components described above can be implemented in hardware, or in software, firmware, or a combination of some or all of the three.

[0068] Furthermore, while this disclosure makes various references to certain elements of systems according to embodiments of this disclosure, any number of different elements may be used and operated on clients and / or servers. Elements are merely illustrative, and different aspects of the system and method may use different elements.

[0069] This disclosure uses flowcharts to illustrate the steps of a method according to embodiments of this disclosure. It should be understood that the preceding or following steps are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes.

[0070] Those skilled in the art will understand that all or part of the steps in the above methods can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium, such as a read-only memory. Optionally, all or part of the steps in the above embodiments can also be implemented using one or more integrated circuits. Accordingly, each module / unit in the above embodiments can be implemented in hardware or as a software functional module. This disclosure is not limited to any particular combination of hardware and software.

[0071] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms such as those defined in a common dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0072] The foregoing description is intended to illustrate the present disclosure and should not be construed as limiting it. While several exemplary embodiments of the present disclosure have been described, those skilled in the art will readily understand that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined by the claims. It should be understood that the foregoing description is intended to illustrate the present disclosure and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims

1. A power converter, characterized in that, include: DC interface, circuit board, DC switch, and power conversion circuit, among which, The circuit board carries a detection circuit for implementing a preset detection function, and the circuit board includes a power transmission layer and a shielding layer. The power transmission layer is provided with a power transmission line and a first grounding module. The power transmission line is insulated from the first grounding module. The shielding layer is provided with a shielding body. The DC interface is connected to one end of the DC switch via the power transmission line, and the other end of the DC switch is connected to the power conversion circuit. The shield is connected to the detection circuit and is at the same potential as the detection circuit; The first grounding module is grounded to release the electrical energy of the lightning when lightning breaks down the insulation between the power transmission line and the first grounding module.

2. The power converter according to claim 1, characterized in that, The projection of the detection circuit in the direction perpendicular to the shielding layer overlaps with the shielding body, and the area of ​​the shielding body is greater than or equal to the area of ​​the projection.

3. The power converter according to claim 1, characterized in that, The shielding body includes a metal shielding plate or a metal shielding mesh.

4. The power converter according to claim 1, characterized in that, The detection circuit includes multiple components, and the shielding body includes at least one component. Each of the shields is connected to at least one of the detection circuits.

5. The power converter according to claim 1, characterized in that, The shield is directly or indirectly connected to the detection circuit.

6. The power converter according to claim 1, characterized in that, The circuit board further includes a first insulating layer and a second insulating layer, wherein... The first insulating layer is located between the power transmission layer and the shielding layer; The second insulating layer is located between the shielding layer and the detection circuit.

7. The power converter according to claim 1, characterized in that, The first grounding module is separated from the power transmission line by a preset insulation distance. The preset insulation distance meets the safety requirements of the power converter, and when the power converter is struck by lightning, the lightning can break down the insulating medium within the preset insulation distance range.

8. The power converter according to claim 1, characterized in that, Also includes: shell, in which, The housing is provided with a second grounding module, and the second grounding module is grounded; The first grounding module is connected to the second grounding module.

9. The power converter according to claim 1, characterized in that, The power transmission line includes a first connection point, a second connection point, and conductors, wherein, The first connection point is located at one end of the wire and is used to connect to the DC interface; The second connection point is located at the other end of the conductor and is used to connect the DC switch.

10. The power converter according to claim 1, characterized in that, The power conversion circuit includes: a DC / DC conversion circuit; Alternatively, a DC / AC converter circuit; Alternatively, DC / DC converter circuits and DC / AC converter circuits.

11. The power converter according to any one of claims 1 to 10, characterized in that, It also includes a lightning protection device, and there is a connection point between the DC switch and the power conversion circuit, with the lightning protection device connected to the connection point.

12. The power converter according to any one of claims 1 to 10, characterized in that, The detection circuit includes a temperature detection circuit, and the temperature detection circuit includes a temperature sensor, wherein... The temperature sensor is mounted on the circuit board to collect the temperature of the DC interface.

13. A power supply system, characterized in that, include: The power converter as described in any one of claims 1 to 12.

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