Communication device for optical storage inverter and optical storage inverter
By designing the transmit and receive filter isolation cache module in the optical storage inverter with the structure of the 485 transmission module, the problem of unstable communication between the MCU and EMS and BMS is solved, and peripheral circuit isolation is used to achieve cost savings and transmission rate improvement. It also absorbs external interference, improving the reliability and stability of the system.
Patent Information
- Application Number
- CN202420892193.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-26
AI Technical Summary
In existing optical storage inverters, communication between MCU and EMS and BMS is difficult to carry out stably, and the chip's built-in circuit isolation is prone to voltage abnormalities and high costs.
A communication device including a transmit filter isolation buffer module, a first receive filter isolation buffer module, a second receive filter isolation buffer module and two 485 transmission modules is designed. The isolation is completed by the peripheral circuit through different isolation circuit structures, and the optical coupling is adopted. and filter circuit absorb interference.
It realizes stable data transmission between MCU, EMS and BMS, saves costs, increases transmission rate, and effectively absorbs external interference, improving the reliability and stability of the circuit.
Smart Images
Figure CN222283248U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of communication devices, and in particular relates to a communication device for a photovoltaic storage inverter and a photovoltaic storage inverter. Background Art
[0002] The MCU in the solar-storage inverter needs to communicate with the EMS and BMS. The related technology adds a control signal inversion circuit, but the circuit stability will be reduced and the control part will also be more difficult.
[0003] At the same time, the related art also uses built-in circuits in the chip for isolation to replace the optocoupler, but voltage anomalies and chip damage are prone to occur, and the cost of replacing the chip is greater than the cost of the optocoupler.
[0004] Therefore, there is an urgent need to develop a new communication device for a photovoltaic storage inverter and a photovoltaic storage inverter to solve the above problems. Utility Model Content
[0005] The utility model aims to provide a communication device for a photovoltaic storage inverter and a photovoltaic storage inverter.
[0006] In order to solve the above technical problems, the utility model provides a communication device for a photovoltaic storage inverter, which includes: a sending filter isolation cache module, a first receiving filter isolation cache module, a second receiving filter isolation cache module and at least two 485 transmission modules; the sending filter isolation cache module, the first receiving filter isolation cache module, and the second receiving filter isolation cache module are electrically connected to the MCU; the first receiving filter isolation cache module is electrically connected to one of the 485 transmission modules so that the 485 transmission module is connected to the EMS; the second receiving filter isolation cache module is electrically connected to another 485 transmission module so that the 485 transmission module is connected to the BMS; each of the 485 transmission modules is electrically connected to the sending filter isolation cache module.
[0007] Specifically, the transmission filtering isolation buffer module includes: a buffer; the buffer is electrically connected to the MCU; and each of the 485 transmission modules is electrically connected to the buffer respectively.
[0008] Specifically, the transmission filtering isolation buffer module further includes: a plurality of first optical couplers; the buffer is connected to the corresponding 485 transmission module through each of the first optical couplers.
[0009] Specifically, the sending filtering isolation buffer module also includes: a first filtering circuit; the buffer is connected to the MCU through the first filtering circuit.
[0010] Specifically, the first receiving filter isolation cache module includes: a first pull-up resistor, a first transistor and a second optocoupler; the first transistor is connected to the 485 transmission module, and the first pull-up resistor is arranged between the first transistor and the 485 transmission module; the second optocoupler connects the MCU and the first transistor.
[0011] Specifically, the second receiving filter isolation cache module includes: a second pull-up resistor, a second transistor and a third transistor; the second transistor is connected to the 485 transmission module, and the second pull-up resistor is arranged between the second transistor and the 485 transmission module; the third transistor connects the MCU and the second transistor.
[0012] Specifically, the 485 transmission module includes: a 485 transceiver; the 485 transceiver is connected to the first receiving filter isolation cache module so that the 485 transceiver is connected to the EMS, or the 485 transceiver is connected to the second receiving filter isolation cache module so that the 485 transceiver is connected to the BMS; the 485 transceiver is electrically connected to the transmitting filter isolation cache module.
[0013] Specifically, the 485 transmission module further includes: an absorption circuit; the absorption circuit connects the 485 transceiver with the EMS, or the absorption circuit connects the 485 transceiver with the BMS.
[0014] Specifically, the absorption circuit includes: a common-mode inductor, a first TVS tube, a second TVS tube, and a third TVS tube; the common-mode inductor is connected to the 485 transceiver, the first TVS tube is connected in parallel with the second TVS tube and the third TVS tube, and the first TVS tube, the second TVS tube, the third TVS tube connected in parallel are connected in series with the common-mode inductor.
[0015] On the other hand, the utility model provides a photovoltaic storage inverter, which includes: an MCU, a communication device for the photovoltaic storage inverter as described above, an EMS and a BMS; the communication device for the photovoltaic storage inverter is electrically connected to the MCU; the EMS and the BMS are electrically connected to the communication device for the photovoltaic storage inverter respectively.
[0016] The beneficial effect of the utility model is that the utility model enables the MCU to send data to the EMS and BMS by setting a sending filter isolation cache module in cooperation with two 485 transmission modules, and at the same time enables the MCU to receive data from the EMS and BMS by setting a first receiving filter isolation cache module and a second receiving filter isolation cache module in cooperation with two 485 transmission modules. At the same time, different isolation circuit structures are adopted, and isolation is completed by peripheral circuits, which not only saves costs, but also increases the transmission rate and can absorb external interference.
[0017] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by implementing the present invention.
[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 The utility model discloses a circuit diagram of a communication device for a photovoltaic storage inverter.
[0021] In the figure:
[0022] U1, MCU; U2, buffer; U5, first optocoupler; R18, first pull-up resistor; Q1, first transistor; U7, second optocoupler; R13, second pull-up resistor; Q2, second transistor; Q3, third transistor; U3, 485 transceiver; L1, common-mode inductor; tvs1, first TVS tube; tvs2, second TVS tube; tvs3, third TVS tube. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] Embodiment 1, in this embodiment, as Figure 1As shown, this embodiment provides a communication device for a photovoltaic energy storage inverter, which includes: a sending filter isolation cache module, a first receiving filter isolation cache module, a second receiving filter isolation cache module and at least two 485 transmission modules; the sending filter isolation cache module, the first receiving filter isolation cache module, and the second receiving filter isolation cache module are electrically connected to MCUU1; the first receiving filter isolation cache module is electrically connected to one of the 485 transmission modules so that the 485 transmission module is connected to the EMS; the second receiving filter isolation cache module is electrically connected to another 485 transmission module so that the 485 transmission module is connected to the BMS; each of the 485 transmission modules is electrically connected to the sending filter isolation cache module.
[0025] In this embodiment, this embodiment realizes that MCUU1 sends data to EMS and BMS by setting a sending filter isolation cache module in conjunction with two 485 transmission modules. At the same time, MCUU1 receives data from EMS and BMS by setting a first receiving filter isolation cache module and a second receiving filter isolation cache module in conjunction with two 485 transmission modules. At the same time, different isolation circuit structures are used, and isolation is completed by peripheral circuits, which not only saves costs, but also increases the transmission rate and can absorb external interference.
[0026] In this embodiment, the transmission filtering isolation buffer module includes: a buffer U2; the buffer U2 is electrically connected to the MCUU1; and each of the 485 transmission modules is electrically connected to the buffer U2 respectively.
[0027] In this embodiment, the transmission filtering isolation buffer module further includes: a plurality of first optical couplers U5; the buffer is connected to the corresponding 485 transmission module through each of the first optical couplers U5.
[0028] Specifically, when multiple 485 transmission modules send signals, the 3.3v of MCUU1 is converted to the 5v voltage required by the 485 transmission module through the buffer U2, and the driving capability can be effectively increased. For the main control EMS, which is easily interfered by the outside world, the signal can be sent through the optical coupler isolation and then connected to the 485 transmission module; for the BMS, it can be directly connected to the sending end of the 485 transmission module through the buffer U2.
[0029] In this embodiment, the transmission filtering isolation buffer module further includes: a first filtering circuit; the buffer U2 is connected to the MCUU1 through the first filtering circuit.
[0030] Specifically, R5 and C1, R6 and C2, R7 and C3, and R8 and C14 form a first filtering circuit, which can effectively absorb the high-frequency signals received and sent by MCUU1 to prevent interference.
[0031] In this embodiment, the first receiving filter isolation cache module includes: a first pull-up resistor R18, a first transistor Q1 and a second optocoupler U7; the first transistor Q1 is connected to the 485 transmission module, and the first pull-up resistor R18 is arranged between the first transistor Q1 and the 485 transmission module; the second optocoupler U7 connects the MCUU1 and the first transistor Q1.
[0032] Specifically, for the main control EMS, the first pull-up resistor R18 is used to default to a high level and is not conductive, and the switch is controlled by the first transistor Q1. Finally, the second optical coupler U7 is used for isolation and level conversion, and 5V is converted to 3.3V for filtering and transmission into MCUU1.
[0033] Specifically, R15 and C6 form a second filtering circuit, which can effectively absorb the high-frequency signals received and sent by MCUU1 to prevent interference.
[0034] In this embodiment, the second receiving filter isolation cache module includes: a second pull-up resistor R13, a second transistor Q2 and a third transistor Q3; the second transistor Q2 is connected to the 485 transmission module, and the second pull-up resistor R13 is arranged between the second transistor Q2 and the 485 transmission module; the third transistor Q3 connects the MCUU1 and the second transistor Q2.
[0035] Specifically, for BMS, the second pull-up resistor R13 is used to default to a high level and is not turned on, and the second transistor Q2 is used to control the switch, and then the third transistor Q3 is used to convert the level, 5v is converted to 3.3v, and finally filtered and transmitted to MCUU1.
[0036] Specifically, R9 and C5 form a third filtering circuit, which can effectively absorb the high-frequency signals received and sent by MCUU1 to prevent interference.
[0037] In this embodiment, the 485 transmission module includes: a 485 transceiver U3; the 485 transceiver U3 is connected to the first receiving filter isolation cache module so that the 485 transceiver U3 is connected to the EMS, or the 485 transceiver U3 is connected to the second receiving filter isolation cache module so that the 485 transceiver U3 is connected to the BMS; the 485 transceiver U3 is electrically connected to the transmitting filter isolation cache module.
[0038] Specifically, the two control pins of the 485 transceiver U3 are each connected in parallel through a resistor and controlled by a pin of the MCUU1. The two control ports of the 485 transceiver U3 respond when the high and low levels are opposite to each other. Only one control port responds at the same time, and the response triggers a receiving and sending pin; the sending and receiving signals of the MUC end are only started when the corresponding control end responds; the two transmission lines of the 485 transceiver U3 send or receive differential signals.
[0039] In this embodiment, the 485 transmission module further includes: an absorption circuit; the absorption circuit connects the 485 transceiver U3 and the EMS, or the absorption circuit connects the 485 transceiver U3 and the BMS.
[0040] In this embodiment, the absorption circuit includes: a common-mode inductor L1, a first TVS tube TVS1, a second TVS tube TVS2, and a third TVS tube TVS3; the common-mode inductor L1 is connected to the 485 transceiver U3, the first TVS tube TVS1 is connected in parallel with the second TVS tube TVS2 and the third TVS tube TVS3, and the first TVS tube TVS1, the second TVS tube TVS2, and the third TVS tube TVS3 after being connected in parallel are connected in series with the common-mode inductor L1.
[0041] Specifically, the common-mode inductor L1 is used to absorb most of the common-mode interference at both ends of the 485 transceiver U3; the grounded TVS tube can effectively absorb the common-mode interference; the 485 two-wire TVS tube can effectively absorb the differential-mode interference and prevent the circuit from interfering with the received signal due to external interference and ESD.
[0042] Embodiment 2, based on embodiment 1, this embodiment provides a photovoltaic storage inverter, which includes: MCUU1, a communication device for the photovoltaic storage inverter as provided in embodiment 1, EMS and BMS; the communication device for the photovoltaic storage inverter is electrically connected to the MCUU1; the EMS and the BMS are electrically connected to the communication device for the photovoltaic storage inverter respectively.
[0043] In summary, the utility model realizes MCU sending data to EMS and BMS by setting a sending filter isolation cache module in cooperation with two 485 transmission modules, and realizes MCU receiving data from EMS and BMS by setting a first receiving filter isolation cache module and a second receiving filter isolation cache module in cooperation with two 485 transmission modules. At the same time, different isolation circuit structures are adopted, and isolation is completed by peripheral circuits, which not only saves costs, but also increases the transmission rate and can absorb external interference; there are high reliability and high stability circuits with low circuit costs; each 485 sending signal passes through a buffer, which not only performs level conversion but also increases the load capacity; BMS sends and receives signals and control signals, removes the optocoupler, and uses a level conversion circuit, which saves costs and increases the transmission rate; the highest-level EMS with relatively large interference still uses optocouplers for isolation; the receiving filter part uses common-mode inductors and TVS tubes to filter and absorb external interference.
[0044] All devices (parts without specific structure) selected in this application are universal standard parts or parts known to those skilled in the art, and their structures and principles can be known by those skilled in the art through technical manuals or conventional experimental methods. In addition, the software programs involved in this application are all prior art, and this application does not involve any improvement to the software programs.
[0045] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0047] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.
[0048] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0049] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
[0050] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A communication device for a photovoltaic storage inverter, characterized in that: include: A sending filter isolation cache module, a first receiving filter isolation cache module, a second receiving filter isolation cache module and at least two 485 transmission modules; The transmitting filter isolation cache module, the first receiving filter isolation cache module, and the second receiving filter isolation cache module are electrically connected to the MCU; The first receiving filter isolation buffer module is electrically connected to one of the 485 transmission modules, so that the 485 transmission module is connected to the EMS; The second receiving filter isolation buffer module is electrically connected to another 485 transmission module, so that the 485 transmission module is connected to the BMS; Each of the 485 transmission modules is electrically connected to the sending filter isolation buffer module.
2. The communication device for a photovoltaic inverter according to claim 1, characterized in that: The sending filtering isolation buffer module comprises: a buffer; The buffer is electrically connected to the MCU; Each of the 485 transmission modules is electrically connected to the buffer respectively.
3. The communication device for a photovoltaic inverter according to claim 2, characterized in that: The transmission filter isolation buffer module further includes: a plurality of first optical couplers; The buffer is connected to the corresponding 485 transmission module through each of the first optical couplers.
4. The communication device for a photovoltaic inverter according to claim 2, characterized in that: The transmission filtering isolation buffer module further includes: a first filtering circuit; The buffer is connected to the MCU through the first filtering circuit.
5. The communication device for a photovoltaic inverter according to claim 1, characterized in that: The first receiving filter isolation buffer module includes: a first pull-up resistor, a first transistor and a second optical coupler; The first triode is connected to the 485 transmission module, and the first pull-up resistor is arranged between the first triode and the 485 transmission module; The second optical coupler connects the MCU and the first transistor.
6. The communication device for a photovoltaic inverter according to claim 1, characterized in that: The second receiving filter isolation buffer module includes: a second pull-up resistor, a second transistor and a third transistor; The second triode is connected to the 485 transmission module, and the second pull-up resistor is arranged between the second triode and the 485 transmission module; The third transistor connects the MCU and the second transistor.
7. The communication device for a photovoltaic inverter according to claim 1, characterized in that: The 485 transmission module includes: a 485 transceiver; The 485 transceiver is connected to the first receiving filter isolation buffer module so that the 485 transceiver is connected to the EMS, or The 485 transceiver is connected to the second receiving filter isolation buffer module so that the 485 transceiver is connected to the BMS; The 485 transceiver is electrically connected to the transmission filter isolation buffer module.
8. The communication device for a photovoltaic inverter according to claim 7, characterized in that: The 485 transmission module also includes: an absorption circuit; The absorption circuit connects the 485 transceiver and the EMS, or The absorption circuit connects the 485 transceiver and the BMS.
9. The communication device for a photovoltaic inverter according to claim 8, characterized in that: The absorption circuit includes: a common mode inductor, a first TVS tube, a second TVS tube, and a third TVS tube; The common-mode inductor is connected to the 485 transceiver, the first TVS tube is connected in parallel with the second TVS tube and the third TVS tube, and the first TVS tube, the second TVS tube and the third TVS tube are connected in parallel and in series with the common-mode inductor.
10. A photovoltaic energy storage inverter, characterized in that: include: MCU, a communication device for a photovoltaic storage inverter according to any one of claims 1 to 9, an EMS and a BMS; The solar-storage inverter is electrically connected to the MCU using a communication device; The EMS and the BMS are electrically connected to the photovoltaic inverter communication device respectively.