PCBA printed circuit board structure of micro inverter
By introducing PLCC units and socket connections on the micro-inverter PCBA, combined with the centerline position design of the main transformer, the problem of increased size of the micro-inverter PCBA structure under high power demand is solved, and a smaller and lighter PCBA design is achieved, which is suitable for a variety of occasions.
Patent Information
- Application Number
- CN202422769992.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-11-13
AI Technical Summary
When existing micro-inverter PCBA structures meet high power requirements, the increase in components leads to an increase in size and high space requirements, making them difficult to apply in occasions with limited space.
PLCC units are used as sub-circuit boards and connected to the PCBA via socket strips to reduce the area of the PCBA. Combined with the centerline position setting of the main transformer and the uniform distribution of components, a compact PCBA design is achieved.
The PCBA is smaller in size and lighter in weight, making it suitable for various occasions with limited space. It also has a simple structure and is suitable for high-power inverters.
Smart Images
Figure CN223391493U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuits, in particular to the technical field of PCBA structures, and specifically refers to a micro inverter PCBA printed circuit board structure. Background Art
[0002] In the field of photovoltaic power generation, microinverters are used to convert the direct current generated by photovoltaic modules into alternating current suitable for integration into the power grid, realizing DC-AC conversion. At the same time, they need to have functions such as overvoltage protection, overcurrent protection, and short-circuit protection to ensure that the system can respond quickly in abnormal situations and avoid equipment damage.
[0003] As technology advances, microinverters need to meet the needs of higher-power devices. As a result, microinverter PCBAs have more components, are larger in overall size, and require more space.
[0004] Therefore, how to provide a micro-inverter PCBA printed circuit board structure with a simple structure, smaller PCBA size, and meeting the needs of high-power applications has become an urgent problem to be solved in this field. Utility Model Content
[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a micro-inverter PCBA printed circuit board structure that uses a PLCC (Power Line Carrier Communications) unit as a sub-circuit board and connects it to the PCBA through a socket strip, thereby making the PCBA smaller in size, thereby reducing the space requirement and making the micro-inverter convenient for use in various space-limited occasions.
[0006] In order to achieve the above objectives, the micro-inverter PCBA printed circuit board structure of the present invention has the following composition:
[0007] The PCBA structure includes a substrate. The micro-inverter includes a flyback circuit, a rectifier circuit, an inverter circuit, a relay, and a filter circuit, all disposed on the substrate and sequentially connected. The flyback circuit's input is connected to a DC voltage, and the flyback circuit includes a main transformer. The filter circuit's output is connected to the power grid. The PCBA structure also includes a PLCC unit, which is disposed on a sub-circuit board that is connected and secured to the printed circuit board via a power strip. The PLCC unit is connected to the filter circuit and the power grid.
[0008] In the micro-inverter PCBA printed circuit board structure, the PLCC unit includes a power carrier communication chip, and a crystal oscillator, a power inductor, a communication transformer and a PLCC module capacitor connected to the power carrier communication chip. The communication transformer is connected to the filter circuit; the crystal oscillator, power carrier communication chip, power inductor, communication transformer and PLCC module capacitor are all fixedly arranged on the sub-circuit board.
[0009] In the micro-inverter PCBA printed circuit board structure, the power carrier communication chip is the MI200E chip.
[0010] In the micro-inverter PCBA printed circuit board structure, the sub-circuit board has a row of plug pins, and the PCBA printed circuit board is provided with a row of plug slots. The sub-circuit board is fixed in the row of plug slots through the row of plug pins.
[0011] In the micro-inverter PCBA printed circuit board structure, the sub-circuit board is vertically plugged into the front side of the PCBA printed circuit board.
[0012] In the micro-inverter PCBA printed circuit board structure, the main transformer is arranged at the center line position of the front of the substrate. The front of the substrate on one side of the transformer and the back of the substrate on this side are the transformer primary component area, and the front of the substrate on the other side of the transformer and the back of the substrate on this side are the transformer secondary component area. The sub-circuit board is plugged into the secondary component area on the front of the PCBA printed circuit board. The area of the PCBA printed circuit board is less than 229×157cm 2 .
[0013] The mass of the micro-inverter PCBA printed circuit board structure is less than 2.8 kg.
[0014] The center of gravity of the micro-inverter PCBA printed circuit board structure is located in the middle of the front side of the substrate where the main transformer is arranged.
[0015] The micro-inverter PCBA structure employing this utility model includes a flyback circuit, a rectifier circuit, an inverter circuit, a relay, and a filter circuit, which are arranged on a substrate and sequentially connected. The flyback circuit's input is connected to a DC voltage, the flyback circuit includes a main transformer, and the filter circuit's output is connected to the power grid. The PCBA structure also includes a PLCC unit arranged on a sub-circuit board, which is connected and fixed to the PCBA via a power strip. This reduces the PCBA's size, reduces the micro-inverter's space requirements, and facilitates its application in various space-constrained applications. Furthermore, the micro-inverter PCBA structure of this utility model is simple in structure and can be applied to various micro-inverter models. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a structural diagram of the micro inverter PCBA printed circuit board structure of the present invention.
[0017] Reference numerals:
[0018] Crystal oscillator 1, power carrier communication chip 2, power inductor 3, communication transformer 4, PLCC capacitor 5, power strip 6, sub-circuit board 10, substrate 20, varistor 22, common mode capacitor 23, discharge tube 24, ceramic capacitor 25, common mode inductor 26, electrolytic capacitor 27, auxiliary power transformer 28, main transformer 29 DETAILED DESCRIPTION
[0019] In order to more clearly understand the technical content of the present invention, the following embodiments are given to explain in detail.
[0020] See also Figure 1 FIG. 1 is a schematic diagram of the structure of the micro inverter PCBA printed circuit board structure of the present invention.
[0021] In one embodiment, the micro-inverter PCBA structure includes a substrate 20. The micro-inverter includes a flyback circuit, a rectifier circuit, an inverter circuit, a relay, and a filter circuit, all disposed on the substrate and sequentially connected. The flyback circuit's input is connected to a DC voltage, the flyback circuit includes a main transformer, and the filter circuit's output is connected to the power grid. The micro-inverter PCBA structure also includes a PLCC unit, which is disposed on a sub-circuit board 10. The sub-circuit board 10 is connected and fixed to the printed circuit board 20 via a socket 6. The PLCC unit is connected to the filter circuit and the power grid.
[0022] The PLCC unit includes a power carrier communication chip 2, a crystal oscillator 1, a power inductor 3, a communication transformer 4, and a PLCC capacitor 5 connected to the power carrier communication chip 2. The communication transformer 4 is connected to the filter circuit. The power carrier communication chip 2 can use the MI200E chip. The crystal oscillator 1, power carrier communication chip 2, power inductor 3, communication transformer 4, and PLCC capacitor 5 are all fixedly mounted on the sub-circuit board 10.
[0023] In a preferred embodiment, the sub-circuit board has a row of plug pins (not shown), and the PCBA is provided with a row of plug slots (not shown). The sub-circuit board 10 is fixed in the row of plug slots via the plug pins. The sub-circuit board 10 is vertically plugged into the front of the PCBA (substrate 10).
[0024] In a more preferred embodiment, the main transformer 29 is provided at the center line position of the front of the substrate 10. The front of the substrate on one side of the main transformer 29 and the back of the substrate on this side are the primary component area of the transformer. The front of the substrate on the other side of the main transformer 29 and the back of the substrate on this side are the secondary component area of the transformer. The sub-circuit board 10 is plugged into the secondary component area on the front of the PCBA printed circuit board. The area of the PCBA printed circuit board is less than 229×157 cm 2 The total mass of the micro-inverter PCBA printed circuit board structure is less than 2.8 kg. Its center of gravity is located in the middle of the front of the substrate where the main transformer 29 is located.
[0025] like Figure 1 As shown, the secondary side component area on the front side of the PCBA printed circuit board is also provided with a varistor 22, a mode capacitor 23, a discharge tube 24 and a ceramic capacitor 25; the primary side component area is also provided with a common mode inductor 26, an electrolytic capacitor 27 and an auxiliary power transformer 28.
[0026] In the application of the present invention, the PLCC unit in the micro-inverter PCBA structure is installed on a sub-circuit board, which is connected and fixed to the PCBA via a socket strip. This eliminates the need for direct installation of the PLCC unit on the PCBA, resulting in a smaller PCBA footprint. This structure can be applied to 800W power inverters and even higher. Even in high-power applications, the size and weight of the micro-inverter PCBA structure of the present invention remain within a relatively small range, making the product more compact and requiring less space for installation. Furthermore, the main transformer is positioned at the centerline of the front of the substrate, and other components are evenly distributed, ensuring a balanced center of gravity for the PCBA. This facilitates cable connection during the subsequent packaging process and allows for stable placement within the micro-inverter housing. Even when filled with thermally conductive adhesive, the packaged micro-inverter maintains a stable center of gravity, allowing it to be securely and stably fixed in the designed position when installed in a photovoltaic system.
[0027] The micro-inverter PCBA structure employing this utility model includes a flyback circuit, a rectifier circuit, an inverter circuit, a relay, and a filter circuit, which are arranged on a substrate and sequentially connected. The flyback circuit's input is connected to a DC voltage, the flyback circuit includes a main transformer, and the filter circuit's output is connected to the power grid. The PCBA structure also includes a PLCC unit arranged on a sub-circuit board, which is connected and fixed to the PCBA via a power strip. This reduces the PCBA's size, reduces the micro-inverter's space requirements, and facilitates its application in various space-constrained applications. Furthermore, the micro-inverter PCBA structure of this utility model is simple in structure and can be applied to various micro-inverter models.
[0028] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.
Claims
1. A micro-inverter PCBA structure, the PCBA structure comprising a substrate, the micro-inverter comprising a flyback circuit, a rectifier circuit, an inverter circuit, a relay, and a filter circuit, all disposed on the substrate and sequentially connected thereto, wherein the flyback circuit has an input connected to a DC voltage, the flyback circuit includes a main transformer, and the filter circuit has an output connected to a power grid, characterized in that: It also includes a PLCC unit, which is arranged on a sub-circuit board. The sub-circuit board is connected to and fixed on the printed circuit board through a socket. The PLCC unit is connected to the filter circuit and the power grid.
2. The micro-inverter PCBA printed circuit board structure according to claim 1, characterized in that: The PLCC unit includes a power carrier communication chip, and a crystal oscillator, a power inductor, a communication transformer and a PLCC module capacitor connected to the power carrier communication chip. The communication transformer is connected to the filter circuit; the crystal oscillator, power carrier communication chip, power inductor, communication transformer and PLCC module capacitor are all fixedly arranged on the sub-circuit board.
3. The micro-inverter PCBA printed circuit board structure according to claim 2, characterized in that: The power line carrier communication chip is the MI200E chip.
4. The micro-inverter PCBA printed circuit board structure according to claim 1, characterized in that: The sub-circuit board has a row of plug pins, and the PCBA printed circuit board is provided with a row of plug slots. The sub-circuit board is fixed in the row of plug slots through the row of plug pins.
5. The micro-inverter PCBA printed circuit board structure according to claim 4, characterized in that: The sub-circuit board is vertically plugged into the front side of the PCBA printed circuit board.
6. The micro-inverter PCBA printed circuit board structure according to claim 5, characterized in that: The main transformer is arranged at the center line position of the front of the substrate. The front of the substrate on one side of the transformer and the back of the substrate are the primary component area of the transformer. The front of the substrate on the other side of the transformer and the back of the substrate are the secondary component area of the transformer. The sub-circuit board is plugged into the secondary component area on the front of the PCBA printed circuit board. The area of the PCBA printed circuit board is less than 229×157cm 2 .
7. The micro-inverter PCBA printed circuit board structure according to claim 6, characterized in that: The mass of the micro-inverter PCBA printed circuit board structure is less than 2.8 kg.
8. The micro-inverter PCBA printed circuit board structure according to claim 7, characterized in that: The center of gravity of the micro-inverter printed circuit board structure is located in the middle of the front side of the substrate where the main transformer is arranged.