DC-DC converter with built-in isolation communication

Abstract

The utility model discloses a DC-DC converter with built-in isolation communication, which comprises a control unit and a DC-DC circuit, the input end of the DC-DC circuit is connected with a solar panel, the output end of the DC-DC circuit is connected with an inverter, and the control unit comprises a power module, an MPPT module, a communication control module and an isolation communication control module; according to the solar panel, corresponding adjustment can be made according to the working state of each solar panel, it is guaranteed that the power generation efficiency of the whole solar panel is maximized, when the solar panel works abnormally or is damaged, the controller can only process the damaged solar panel, and meanwhile, due to the fact that a plurality of solar panels do not need to be connected in series, the power generation efficiency of the whole solar panel is improved. And the voltage resistance requirement on the DC-DC converter is correspondingly reduced, so that the cost is reduced, and the reliability of the whole system is improved.

Description

Technical Field

[0001] This utility model relates to the field of DC-DC converters, and in particular to a DC-DC converter with built-in isolated communication. Background Technology

[0002] Because solar panels have low photoelectric conversion efficiency, multiple solar panels need to be connected in series to form a large area in a solar power generation system in order to generate enough electricity. However, this will cause some problems. For example, if a single or multiple solar panels are shaded or damaged, the overall power generation efficiency of the solar panels will decrease.

[0003] Current technology in photovoltaic power generation systems connects solar panels in series to directly power a DC-DC converter. A controller then performs MPPT (Multi-Level Testing) efficiency tracking on the DC-DC converter to control its power supply to the inverter. However, this type of DC-DC converter has the following drawbacks:

[0004] 1. If a single or multiple solar panels are shaded or damaged, the overall power generation efficiency of the solar panels will decrease.

[0005] 2. If one or more solar panels malfunction or are damaged, the controller cannot only address the damaged solar panels.

[0006] 3. The output voltage of multiple solar panels connected in series is very high, which requires the DC-DC converter to have a correspondingly higher voltage withstand capability, thus increasing the cost of the solution.

[0007] Therefore, there is an urgent need for a DC-DC converter with built-in isolated communication to solve the above problems. Utility Model Content

[0008] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a DC-DC converter with built-in isolated communication.

[0009] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a DC-DC converter with built-in isolated communication, including a control unit and a DC-DC circuit. The input terminal of the DC-DC circuit is connected to a solar panel and the output terminal is connected to an inverter. The control unit includes a power module, an MPPT module, a communication control module and an isolated communication control module.

[0010] The power module and MPPT module are connected to the DC-DC circuit to control the DC-DC circuit to track the maximum power output point of the solar panel;

[0011] The communication control module is connected to the power module, MPPT module and isolated communication control module respectively, and the communication control module is connected to the controller.

[0012] The isolated communication control module is connected to the power module, MPPT module, and the isolated communication control module of the previous or next stage DC-DC converter, so that different DC-DC converters can form a series circuit and exchange information.

[0013] In one preferred embodiment of this utility model, two control units and two DC-DC circuits are configured to form two DC-DC converters;

[0014] The input terminal of the first DC-DC circuit is connected to the first solar panel, the output terminal of the first DC-DC circuit is connected to the GND terminal of the second DC-DC circuit, the communication control module of the first control unit is connected to the controller, and the isolation communication control module of the first control unit is connected to the isolation communication control module of the second control unit.

[0015] The input of the second DC-DC circuit is connected to the second solar panel, the output of the second DC-DC circuit is connected to the inverter, and the other end of the inverter is connected to the GND terminal of the first DC-DC circuit.

[0016] In one of the preferred embodiments of this utility model, three control units and three DC-DC circuits are configured to form three DC-DC converters;

[0017] The input terminal of the first DC-DC circuit is connected to the first solar panel, the output terminal of the first DC-DC circuit is connected to the GND terminal of the second DC-DC circuit, the communication control module of the first control unit is connected to the controller, and the isolation communication control module of the first control unit is connected to the isolation communication control module of the second control unit.

[0018] The input terminal of the second DC-DC circuit is connected to the second solar panel, the output terminal of the second DC-DC circuit is connected to the GND terminal of the third DC-DC circuit, and the isolation communication control module of the second control unit is connected to the isolation communication control module of the third control unit.

[0019] The input of the third DC-DC circuit is connected to the third solar panel, the output of the third DC-DC circuit is connected to the inverter, and the other end of the inverter is connected to the GND terminal of the first DC-DC circuit.

[0020] In one of the preferred embodiments of this utility model, three control units and three DC-DC circuits are configured to form three DC-DC converters;

[0021] The input terminal of the first DC-DC circuit is connected to the first solar panel, the output terminal of the first DC-DC circuit is connected to the GND terminal of the second DC-DC circuit, the communication control module of the first control unit is connected to the controller, and the isolation communication control module of the first control unit is connected to the isolation communication control module of the second control unit and the isolation communication control module of the third control unit respectively.

[0022] The input terminal of the second DC-DC circuit is connected to the second solar panel, and the output terminal of the second DC-DC circuit is connected to the GND terminal of the third DC-DC circuit.

[0023] The input of the third DC-DC circuit is connected to the third solar panel, the output of the third DC-DC circuit is connected to the inverter, and the other end of the inverter is connected to the GND terminal of the first DC-DC circuit.

[0024] As one of the preferred embodiments of this utility model, the communication control module is configured with an SPI interface, an IIC interface, a UART interface, a USB interface, a CAN interface, an RS-232 interface, or an RS-485 interface.

[0025] As one of the preferred embodiments of this utility model, the isolation communication control module is configured as an optical isolation circuit, a magnetic isolation circuit, a capacitor isolation circuit, or an optical fiber isolation circuit.

[0026] The beneficial effects of this utility model are: it can make corresponding adjustments according to the working status of each solar panel to ensure that the overall power generation efficiency of the solar panel is maximized; when the solar panel malfunctions or is damaged, the controller can only deal with the damaged solar panel; at the same time, since multiple solar panels no longer need to be connected in series, the withstand voltage requirement of the DC-DC converter is also reduced accordingly, which not only reduces costs but also increases the reliability of the entire system. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic block diagram of a first embodiment of a DC-DC converter with built-in isolated communication;

[0029] Figure 2 This is a schematic block diagram of a second embodiment of a DC-DC converter with built-in isolated communication;

[0030] Figure 3 This is a schematic block diagram of a third embodiment of a DC-DC converter with built-in isolated communication;

[0031] Figure 4 This is a schematic block diagram of a fourth embodiment of a DC-DC converter with built-in isolated communication;

[0032] Figure 5 This is a schematic block diagram of a fifth embodiment of a DC-DC converter with built-in isolated communication. Detailed Implementation

[0033] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0034] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0035] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] Reference Figures 1 to 5 A DC-DC converter with built-in isolated communication includes a control unit 10 and a DC-DC circuit 20. The input terminal of the DC-DC circuit 20 is connected to a solar panel and the output terminal is connected to an inverter. The control unit 10 includes a power module 11, an MPPT module 12, a communication control module 13, and an isolated communication control module 14.

[0038] Power module 11 and MPPT module 12 are connected to DC-DC circuit 20 to control DC-DC circuit 20 to track the maximum power output point of solar panel;

[0039] The communication control module 13 is connected to the power module 11, the MPPT module 12 and the isolated communication control module 14 respectively, and the communication control module 13 is connected to the controller.

[0040] The isolation communication control module 14 is connected to the power module 11, the MPPT module 12, and the isolation communication control module 14 of the previous or next stage DC-DC converter, so that different DC-DC converters form a series circuit and exchange information.

[0041] In this invention, each DC-DC converter control unit 10 is equipped with a power module 11 and an MPPT module 12, which can perform MPPT efficiency tracking based on the working status of each solar panel to maximize its power generation efficiency. Since the multiple DC-DC converters are not grounded, an isolation communication control module 14 is built into the control unit 10 of the DC-DC converter, which enables information exchange between the DC-DC converters that are not grounded through isolated communication. The communication control module 13 built into the control unit 10 of the DC-DC converter exchanges the working status of each DC-DC converter with the external controller through the communication interface, so that the controller can obtain the working status of each DC-DC converter in real time and obtain the working status of each solar panel based on the working status of each DC-DC converter. When the solar panel malfunctions or is damaged, the controller can only deal with the damaged solar panel.

[0042] Reference Figure 1 and Figure 3As a first embodiment of a DC-DC converter, this embodiment is used for series control of two DC-DC converters. Two control units 10 and two DC-DC circuits 20 are configured to form two DC-DC converters (#1 DC-DC converter and #2 DC-DC converter). The input terminal of the first DC-DC circuit 20 is connected to the first solar panel, and the output terminal of the first DC-DC circuit 20 is connected to the GND terminal of the second DC-DC circuit 20. The communication control module 13 of the first control unit 10 is connected to the controller, and the isolated communication control module 14 of the first control unit 10 is connected to the isolated communication module 14 of the second control unit 10. The control module 14 is connected; the input terminal of the second DC-DC circuit 20 is connected to the second solar panel, the output terminal of the second DC-DC circuit 20 is connected to the inverter, and the other end of the inverter is connected to the GND terminal of the first DC-DC circuit 20. Specifically, the controller can directly interact with the #1 DC-DC converter through the communication interface to obtain the operating status of the #1 DC-DC converter. Then, the #1 DC-DC converter will exchange the controller's information with the #2 DC-DC converter through its internal isolation communication control module 14 to obtain the operating status of the #2 DC-DC converter.

[0043] Reference Figure 2 and Figure 3As a second embodiment of the DC-DC converter, for the series control of three DC-DC converters, the control unit 10 and DC-DC circuit 20 are configured as three to form three DC-DC converters (#1 DC-DC converter, #2 DC-DC converter, and #3 DC-DC converter); the input terminal of the first DC-DC circuit 20 is connected to the first solar panel, the output terminal of the first DC-DC circuit 20 is connected to the GND terminal of the second DC-DC circuit 20, the communication control module 13 of the first control unit 10 is connected to the controller, and the isolation communication control module 14 of the first control unit 10 is connected to the isolation communication control module 14 of the second control unit 10; the input terminal of the second DC-DC circuit 20 is connected to the second solar panel, the output terminal of the second DC-DC circuit 20 is connected to the GND terminal of the third DC-DC circuit 20, and the second control unit 10... The isolation communication control module 14 of the 0 control unit is connected to the isolation communication control module 14 of the third control unit 10; the input terminal of the third DC-DC circuit 20 is connected to the third solar panel, the output terminal of the third DC-DC circuit 20 is connected to the inverter, and the other end of the inverter is connected to the GND terminal of the first DC-DC circuit 20; specifically, the controller can directly interact with the #1 DC-DC converter through the communication interface to obtain the operating status of the #1 DC-DC converter, and then the #1 DC-DC converter will interact with the #2 DC-DC converter through its internal isolation communication control module 14 to obtain the operating status of the #2 DC-DC converter; then the #2 DC-DC converter will interact with the #3 DC-DC converter through its internal isolation communication control module 14 to obtain the operating status of the #3 DC-DC converter.

[0044] Reference Figure 4 and Figure 5As a third embodiment of the DC-DC converter, for the series control of three DC-DC converters, the control unit 10 and DC-DC circuit 20 are configured as three to form three DC-DC converters (#1 DC-DC converter, #2 DC-DC converter, and #3 DC-DC converter); the input terminal of the first DC-DC circuit 20 is connected to the first solar panel, the output terminal of the first DC-DC circuit 20 is connected to the GND terminal of the second DC-DC circuit 20, the communication control module 13 of the first control unit 10 is connected to the controller, and the isolation communication control module 14 of the first control unit 10 is connected to the isolation communication control modules 14 of the second control unit 10 and the third control unit 10 respectively; the second DC-DC circuit 20... The input terminal is connected to the second solar panel, and the output terminal of the second DC-DC circuit 20 is connected to the GND terminal of the third DC-DC circuit 20. The input terminal of the third DC-DC circuit 20 is connected to the third solar panel, and the output terminal of the third DC-DC circuit 20 is connected to the inverter. The other end of the inverter is connected to the GND terminal of the first DC-DC circuit 20. Specifically, the controller can directly interact with the #1 DC-DC converter through the communication interface to obtain the operating status of the #1 DC-DC converter. Then, the #1 DC-DC converter will exchange the controller's information with the #2 DC-DC converter and the #3 DC-DC converter through its internal isolation communication control module 14 to obtain the operating status of the #2 DC-DC converter and the #3 DC-DC converter.

[0045] Preferably, the control unit 20 may be composed of a central processing unit (CPU), a microcontroller unit (MCU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or a field-programmable gate array (FPGA). It may also be composed of programmable logic devices, discrete gates or transistor logic devices, or discrete hardware components, etc., which will not be elaborated here and should not be considered as a limitation of this utility model.

[0046] Preferably, the communication control module 13 is configured with an SPI interface, an IIC interface, a UART interface, a USB interface, a CAN interface, an RS-232 interface, or an RS-485 interface.

[0047] Preferably, the isolation communication control module 14 is configured as an optical isolation circuit, a magnetic isolation circuit, a capacitor isolation circuit, or an optical fiber isolation circuit.

[0048] The advantages of this invention are: 1. It can make corresponding adjustments according to the working status of each solar panel to ensure that the overall power generation efficiency of the solar panel is maximized; 2. When the solar panel malfunctions or is damaged, the controller can only handle the damaged solar panel; 3. At the same time, since multiple solar panels no longer need to be connected in series, the withstand voltage requirement of the DC-DC converter is also reduced accordingly, which not only reduces the cost but also increases the reliability of the entire system.

[0049] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A DC-DC converter with built-in galvanic isolation communication, characterized by: It includes a control unit (10) and a DC-DC circuit (20), the input end of which is connected to the solar panel and the output end of which is connected to the inverter. The control unit (10) includes a power module (11), an MPPT module (12), a communication control module (13), and an isolated communication control module (14). The power module (11) and MPPT module (12) are connected to the DC-DC circuit (20) and are used to control the DC-DC circuit (20) to track the maximum power output point of the solar panel; The communication control module (13) is connected to the power module (11), the MPPT module (12) and the isolation communication control module (14) respectively, and the communication control module (13) is connected to the controller; The isolation communication control module (14) is connected to the power module (11), the MPPT module (12), and the isolation communication control module (14) of the previous or next-level DC-DC converter, so that different DC-DC converters form a series circuit and exchange information.

2. The DC-DC converter with built-in galvanic isolation communication according to claim 1, characterized in that: The control unit (10) and the DC-DC circuit (20) are configured as two units to form two DC-DC converters; The input terminal of the first DC-DC circuit (20) is connected to the first solar panel, the output terminal of the first DC-DC circuit (20) is connected to the GND terminal of the second DC-DC circuit (20), the communication control module (13) of the first control unit (10) is connected to the controller, and the isolation communication control module (14) of the first control unit (10) is connected to the isolation communication control module (14) of the second control unit (10). The input terminal of the second DC-DC circuit (20) is connected to the second solar panel, the output terminal of the second DC-DC circuit (20) is connected to the inverter, and the other end of the inverter is connected to the GND terminal of the first DC-DC circuit (20).

3. The DC-DC converter with built-in galvanic isolation communication of claim 1, wherein: The control unit (10) and DC-DC circuit (20) are configured in three units to form three DC-DC converters; The input terminal of the first DC-DC circuit (20) is connected to the first solar panel, the output terminal of the first DC-DC circuit (20) is connected to the GND terminal of the second DC-DC circuit (20), the communication control module (13) of the first control unit (10) is connected to the controller, and the isolation communication control module (14) of the first control unit (10) is connected to the isolation communication control module (14) of the second control unit (10). The input terminal of the second DC-DC circuit (20) is connected to the second solar panel, the output terminal of the second DC-DC circuit (20) is connected to the GND terminal of the third DC-DC circuit (20), and the isolation communication control module (14) of the second control unit (10) is connected to the isolation communication control module (14) of the third control unit (10). The input terminal of the third DC-DC circuit (20) is connected to the third solar panel, the output terminal of the third DC-DC circuit (20) is connected to the inverter, and the other end of the inverter is connected to the GND terminal of the first DC-DC circuit (20).

4. The DC-DC converter with built-in galvanic isolation communication of claim 1, wherein: The control unit (10) and DC-DC circuit (20) are configured in three units to form three DC-DC converters; The input terminal of the first DC-DC circuit (20) is connected to the first solar panel, the output terminal of the first DC-DC circuit (20) is connected to the GND terminal of the second DC-DC circuit (20), the communication control module (13) of the first control unit (10) is connected to the controller, and the isolation communication control module (14) of the first control unit (10) is connected to the isolation communication control module (14) of the second control unit (10) and the isolation communication control module (14) of the third control unit (10) respectively. The input terminal of the second DC-DC circuit (20) is connected to the second solar panel, and the output terminal of the second DC-DC circuit (20) is connected to the GND terminal of the third DC-DC circuit (20). The input terminal of the third DC-DC circuit (20) is connected to the third solar panel, the output terminal of the third DC-DC circuit (20) is connected to the inverter, and the other end of the inverter is connected to the GND terminal of the first DC-DC circuit (20).

5. The DC-DC converter with built-in galvanic isolation communication of claim 1, wherein: The communication control module (13) is configured with an SPI interface, IIC interface, UART interface, USB interface, CAN interface, RS-232 interface or RS-485 interface.

6. The DC-DC converter with built-in galvanic isolation communication of claim 1, wherein: The isolated communication control module (14) is configured as an optical isolation circuit, a magnetic isolation circuit, a capacitor isolation circuit, or an optical fiber isolation circuit.

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