A new type of photovoltaic fast turn-off device regulating circuit

Abstract

The application provides a novel photovoltaic fast shutdown device regulating circuit, which is driven by a common triode chip as a MOS circuit, so that the photovoltaic fast shutdown device has the advantages of low cost and high reliability. The regulating circuit comprises a main chip control circuit, a DC-DC power supply circuit, a carrier coupling circuit, a MOS driving circuit and a MOS circuit. The main chip control circuit is connected with the DC-DC power supply circuit, the carrier coupling circuit and the MOS driving circuit respectively, the DC-DC power supply circuit is connected with the carrier coupling circuit and the MOS driving circuit respectively, and the MOS driving circuit is connected with the MOS circuit.

Description

Technical Field

[0001] This application relates to the field of photovoltaic power technology, specifically to a novel control circuit for a photovoltaic fast shutdown device. Background Technology

[0002] With the continuous advancement of photovoltaic power generation technology, the efficiency of photovoltaic panel power generation has gradually improved, and the application of photovoltaic power generation has become increasingly widespread, with larger-scale applications. In the large-scale application of photovoltaic power generation, two modes have emerged: distributed photovoltaic power generation and centralized photovoltaic power generation. Among them, distributed photovoltaic power generation, with its relatively small scale and diverse installation locations (flexibly installed on building rooftops or outdoor open spaces), is widely used on building rooftops in both urban and rural areas.

[0003] However, in actual use of photovoltaic power generation, the equipment may be damaged due to natural disasters. When maintenance personnel are carrying out maintenance, they are often unsure whether the photovoltaic power is still generating electricity normally, which poses a great risk to personal safety. Therefore, in order to protect personal safety, it is often necessary to add a shutdown device to photovoltaic power generation applications to ensure that the equipment is in a power outage state during disasters.

[0004] In the existing technology, using a MOSFET as a switching device in a shutdown device can ensure that the energized state of the device is cut off in an emergency. However, in the current common MOSFET drive design, a dedicated driver IC is required to drive the MOSFET as the gate driver. This gate driver IC usually requires software program control. The gate driver IC is relatively expensive, and in actual use, the MOSFET is prone to damage due to software control failure.

[0005] Therefore, in view of the above problems, this application proposes a novel control circuit for a photovoltaic fast shutdown device. Summary of the Invention

[0006] This application provides a novel control circuit for a photovoltaic fast shutdown device. By using a common transistor chip as the MOS circuit driver, the photovoltaic fast shutdown device has the advantages of low cost and high reliability.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] In a first aspect, this application provides a novel control circuit for a photovoltaic fast shutdown device, the control circuit comprising: a main chip control circuit, a DC-DC power supply circuit, a carrier coupling circuit, a MOS drive circuit, and a MOS circuit;

[0009] The main chip control circuit is connected to the DC-DC power supply circuit, the carrier coupling circuit, and the MOS drive circuit, respectively. The DC-DC power supply circuit is connected to the carrier coupling circuit and the MOS drive circuit, respectively. The MOS drive circuit is connected to the MOS circuit.

[0010] The DC-DC power supply circuit is connected to the external photovoltaic input voltage and is used to filter the photovoltaic input voltage to provide the operating voltage for the control circuit.

[0011] The carrier coupling circuit is connected to an external information device and is used to transmit external information input from the external information device to the main chip control circuit.

[0012] The main chip control circuit is used to receive and process external information transmitted by the carrier coupling circuit, and then transmit the processed external information to the MOS drive circuit.

[0013] The MOS driver circuit is used to receive processed external information transmitted by the main chip control circuit, and control the MOS circuit to perform switching or closing operations based on the processed external information.

[0014] MOS circuits are used to perform switching or closing operations under the control of MOS drive circuits.

[0015] One possible design scheme, the first aspect of the control circuit also includes the main chip control circuit including MCU, peripheral circuit, receiving circuit, transmitting circuit, IO port and crystal oscillator circuit;

[0016] The MCU is connected to the peripheral circuit, receiving circuit, transmitting circuit, I / O port and crystal oscillator circuit respectively;

[0017] Peripheral circuitry is used to receive the operating voltage from the DC-DC power supply circuit and provide it to the MCU, as well as to isolate the instantaneous operating voltage provided by the DC-DC power supply circuit.

[0018] The receiving circuit is used to receive external information transmitted by the carrier coupling circuit and transmit the external information to the MCU.

[0019] The MCU is used to receive and process external information transmitted by the receiving circuit, and then transmit the processed external information to the MOS drive circuit and the transmitting circuit.

[0020] The transmitting circuit is used to receive external information processed by the MCU and transmit it to the carrier coupling circuit.

[0021] I / O ports are used to connect the MCU to the receiving circuit, transmitting circuit, and MOS driver circuit.

[0022] The crystal oscillator circuit is used to provide clock signals to the MCU.

[0023] One possible design scheme, the first aspect of the control circuit also includes an LME3281 chip as the MCU.

[0024] One possible design scheme, the first aspect of the control circuit also includes, the DC-DC power supply circuit including a unidirectional conduction single-channel and filter circuit, a DC-DC power supply chip, an energy storage filter circuit and output and feedback circuits;

[0025] The DC-DC power chip is connected to the unidirectional conduction single-channel and filter circuit, the energy storage filter circuit and the output and feedback circuit respectively, and the energy storage filter circuit and the output and feedback circuit are connected.

[0026] A unidirectional conduction and filtering circuit is used to prevent reverse connection of the DC-DC power supply circuit and to filter the external photovoltaic input voltage.

[0027] DC-DC power supply chip, used to convert photovoltaic input voltage into output voltage;

[0028] Energy storage and filtering circuit and output, used to output the output voltage converted by the DC-DC power chip;

[0029] Feedback circuits are used to ensure the stability of DC-DC power supply circuits.

[0030] One possible design scheme, the first aspect of the control circuit also includes, the MOS drive circuit including a dual transistor circuit, an inverting circuit and an output protection circuit;

[0031] The dual-transistor circuit is connected to the inverter circuit and the output protection circuit, respectively.

[0032] A dual-transistor circuit is used to receive the voltage provided by the DC-DC power supply circuit and control the voltage output to the MOS circuit.

[0033] A reverse circuit is used to control a MOS circuit to perform switching or closing operations.

[0034] Output protection circuit, used to protect the MOS drive circuit.

[0035] One possible design scheme, the first aspect of the control circuit, also includes a dual transistor circuit with a built-in ordinary triode for gate drive, controlling the voltage output to the MOS circuit.

[0036] One possible design scheme, the first aspect of the control circuit also includes an inverting circuit comprising multiple resistors and at least one transistor.

[0037] One possible design scheme, the first aspect of the control circuit also includes an output protection circuit comprising multiple diodes, multiple resistors and at least one capacitor.

[0038] One possible design scheme, the first aspect of the control circuit also includes a MOS circuit comprising two MOS transistors.

[0039] One possible design scheme, the first aspect of the control circuit also includes a main chip control circuit, which is also used to send the internal information of the control circuit to the carrier coupling circuit; the carrier coupling circuit is also used to transmit the internal information to the external information device.

[0040] In this embodiment, the control circuit of the novel photovoltaic fast shutdown device provided in this embodiment adopts a control circuit composed of a main chip control circuit, a DC-DC power supply circuit, a carrier coupling circuit, a MOS drive circuit, and a MOS circuit. It uses a common transistor chip as the MOS circuit driver, replacing the dedicated MOS driver chip to realize the MOS circuit (MOS transistor) driving scheme. This ensures that the photovoltaic system can quickly disconnect the circuit in case of an emergency, enhances the overall stability and safety of the system, and reduces production costs.

[0041] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A schematic diagram of the control circuit of the novel photovoltaic fast shutdown device provided in the embodiments of this application;

[0044] Figure 2 The circuit diagram of the main chip control circuit in the regulation circuit of the novel photovoltaic fast shutdown device provided in the embodiments of this application;

[0045] Figure 3 A circuit diagram of the DC-DC power supply circuit in the control circuit of the novel photovoltaic fast shutdown device provided in the embodiments of this application;

[0046] Figure 4 The circuit diagram of the MOS drive circuit in the control circuit of the novel photovoltaic fast shutdown device provided in the embodiments of this application;

[0047] Figure 5 The circuit diagram of the MOS circuit in the control circuit of the novel photovoltaic fast shutdown device provided in the embodiments of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments in this specification clearer, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. The components of the embodiments of this specification described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of this specification provided in the accompanying drawings is not intended to limit the scope of the claimed specification, but merely to illustrate selected embodiments of this specification. All other embodiments obtained by those skilled in the art based on the embodiments in this specification without inventive effort are within the scope of protection of this specification.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] In the description of the embodiments in this specification, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These are merely for the convenience of describing this specification and for 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 specification. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0053] In the description of the embodiments in this specification, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0054] The following section will describe in detail a novel control circuit for a photovoltaic fast shutdown device. This device aims to improve the reliability and safety of the system by applying MOSFETs to the switching control of the photovoltaic power system. At the same time, in order to further optimize the cost-effectiveness of the product, a low-cost and highly reliable MOSFET driving circuit is developed to drive the MOSFETs.

[0055] Figure 1 A schematic diagram of the control circuit of the novel photovoltaic fast shutdown device provided in the embodiments of this application.

[0056] like Figure 1 As shown, the control circuit of this novel photovoltaic fast shutdown device mainly includes: a main chip control circuit, a DC-DC power supply circuit, a carrier coupling circuit, a MOS drive circuit, and a MOS circuit.

[0057] The main chip control circuit is connected to the DC-DC power supply circuit, the carrier coupling circuit, and the MOS drive circuit, respectively. The DC-DC power supply circuit is connected to the carrier coupling circuit and the MOS drive circuit, respectively. The MOS drive circuit is connected to the MOS circuit.

[0058] The DC-DC power supply circuit is connected to the external photovoltaic input voltage and is used to filter the photovoltaic input voltage to provide the operating voltage for the control circuit.

[0059] The carrier coupling circuit is connected to an external information device and is used to transmit external information input from the external information device to the main chip control circuit.

[0060] The main chip control circuit is used to receive and process external information transmitted by the carrier coupling circuit, and then transmit the processed external information to the MOS drive circuit.

[0061] The MOS driver circuit is used to receive processed external information transmitted by the main chip control circuit, and control the MOS circuit to perform switching or closing operations based on the processed external information.

[0062] MOS circuits are used to perform switching or closing operations under the control of MOS drive circuits.

[0063] It should be noted that the aforementioned main chip control circuit is also used to send the internal information of the modulation circuit to the carrier coupling circuit; correspondingly, the aforementioned carrier coupling circuit is also used to transmit the internal information to external information devices. Furthermore, the internal information may be external information processed by the main chip control circuit, or other possible information, which will not be elaborated upon here.

[0064] In this embodiment, as Figure 2 The main chip control circuit includes an MCU, peripheral circuits, receiving circuits, transmitting circuits, I / O ports, and a crystal oscillator circuit.

[0065] The MCU is connected to the peripheral circuit, receiving circuit, transmitting circuit, I / O port and crystal oscillator circuit respectively;

[0066] Peripheral circuitry is used to receive the operating voltage from the DC-DC power supply circuit and provide it to the MCU, as well as to isolate the instantaneous operating voltage provided by the DC-DC power supply circuit.

[0067] The receiving circuit is used to receive external information transmitted by the carrier coupling circuit and transmit the external information to the MCU.

[0068] The MCU is used to receive and process external information transmitted by the receiving circuit, and then transmit the processed external information to the MOS drive circuit and the transmitting circuit.

[0069] The transmitting circuit is used to receive external information processed by the MCU and transmit it to the carrier coupling circuit.

[0070] I / O ports are used to connect the MCU to the receiving circuit, transmitting circuit, and MOS driver circuit.

[0071] The crystal oscillator circuit is used to provide clock signals to the MCU.

[0072] Furthermore, the aforementioned MCU can be an LME3281 (QFN80) chip, or other known chips, which will not be elaborated upon here.

[0073] The aforementioned peripheral circuitry is used to isolate the instantaneous operating voltage provided by the DC-DC power supply circuit, and can also be used to isolate instantaneous large currents to prevent the MCU from burning out.

[0074] In this embodiment, as Figure 3 The DC-DC power supply circuit includes a unidirectional conduction circuit and a filter circuit, a DC-DC power chip, an energy storage filter circuit, and output and feedback circuits.

[0075] The DC-DC power chip is connected to the unidirectional conduction single-channel and filter circuit, the energy storage filter circuit and the output and feedback circuit respectively, and the energy storage filter circuit and the output and feedback circuit are connected.

[0076] A unidirectional conduction and filtering circuit is used to prevent reverse connection of the DC-DC power supply circuit and to filter the external photovoltaic input voltage.

[0077] DC-DC power supply chip, used to convert photovoltaic input voltage into output voltage;

[0078] Energy storage and filtering circuit and output, used to output the output voltage converted by the DC-DC power chip;

[0079] Feedback circuits are used to ensure the stability of DC-DC power supply circuits.

[0080] It should also be noted that the DC-DC power supply circuit filters the photovoltaic input voltage to provide the operating voltage for the control circuit (i.e., the regulation circuit of the entire photovoltaic fast shutdown device).

[0081] In this embodiment, the carrier coupling circuit can be understood as an inductor-capacitor filter circuit, used to transmit external information input from external information devices (or external information received by the power line carrier PLC) to the main chip control circuit, or to transmit internal information transmitted by the main chip control circuit to external information devices.

[0082] In this embodiment, as Figure 4 The MOS drive circuit includes a dual-transistor circuit, an inverting circuit, and an output protection circuit.

[0083] The dual-transistor circuit is connected to the inverter circuit and the output protection circuit, respectively.

[0084] A dual-transistor circuit is used to receive the voltage provided by the DC-DC power supply circuit and control the voltage output to the MOS circuit.

[0085] A reverse circuit is used to control a MOS circuit to perform switching or closing operations.

[0086] Output protection circuit, used to protect the MOS drive circuit.

[0087] Furthermore, the dual-transistor circuit incorporates a common transistor for gate drive, controlling the voltage output to the MOS circuit. In other words, the use of dual transistor Q4 ensures that the gate voltage ultimately output from the MOS drive circuit to the MOS circuit is always higher than the source voltage (photovoltaic input voltage).

[0088] In addition, the reverse circuit includes multiple resistors and at least one transistor. In this application, the reverse circuit is composed of R17, R19, R23, R24, and Q5, which controls the MOS circuit to perform switching or closing operations. The output protection circuit includes multiple diodes, multiple resistors, and at least one capacitor. In this application, the output protection circuit is composed of D5, D6, D7, R16, R20, and C8, which protects the MOS drive circuit.

[0089] In this embodiment, as Figure 5 The MOS circuit includes two MOS transistors.

[0090] In summary, the novel photovoltaic fast shutdown control circuit provided in this application adopts a control circuit composed of a main chip control circuit, a DC-DC power supply circuit, a carrier coupling circuit, a MOS drive circuit, and a MOS circuit. It uses a common transistor chip as the MOS circuit driver, replacing the dedicated MOS driver chip to achieve the MOS circuit (MOS transistor) driving scheme. This ensures that the photovoltaic system can quickly disconnect the circuit in case of an emergency, enhances the overall stability and safety of the system, and reduces production costs.

[0091] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the scope of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in the details for the sake of brevity.

[0092] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A novel control circuit for a photovoltaic fast shutdown device, characterized in that, The control circuit includes: a main chip control circuit, a DC-DC power supply circuit, a carrier coupling circuit, a MOS drive circuit, and a MOS circuit; The main chip control circuit is connected to the DC-DC power supply circuit, the carrier coupling circuit, and the MOS driving circuit, respectively. The DC-DC power supply circuit is connected to the carrier coupling circuit and the MOS driving circuit, respectively. The MOS driving circuit is connected to the MOS circuit. The DC-DC power supply circuit is connected to the external photovoltaic input voltage and is used to filter the photovoltaic input voltage to provide the operating voltage for the control circuit. The carrier coupling circuit is connected to an external information device and is used to transmit external information input from the external information device to the main chip control circuit. The main chip control circuit is used to receive and process the external information transmitted by the carrier coupling circuit, and then transmit the processed external information to the MOS driving circuit. The MOS driving circuit is used to receive processed external information transmitted by the main chip control circuit, and control the MOS circuit to perform switching or closing operations based on the processed external information. The MOS circuit is used to perform switching or closing operations under the control of the MOS driving circuit.

2. The control circuit of the novel photovoltaic fast shutdown device according to claim 1, characterized in that, The main chip control circuit includes an MCU, peripheral circuits, a receiving circuit, a transmitting circuit, I / O ports, and a crystal oscillator circuit. The MCU is connected to the peripheral circuit, the receiving circuit, the transmitting circuit, the I / O port, and the crystal oscillator circuit, respectively. The peripheral circuit is used to receive the operating voltage provided by the DC-DC power supply circuit and provide it to the MCU, as well as to isolate the instantaneous operating voltage provided by the DC-DC power supply circuit. The receiving circuit is used to receive external information transmitted by the carrier coupling circuit and transmit the external information to the MCU; The MCU is used to receive and process the external information transmitted by the receiving circuit, and then transmit the processed external information to the MOS driving circuit and the transmitting circuit. The transmitting circuit is used to receive external information processed by the MCU and transmit it to the carrier coupling circuit. The I / O port is used to connect the MCU to the receiving circuit, the transmitting circuit, and the MOS driving circuit; The crystal oscillator circuit is used to provide a clock signal to the MCU.

3. The control circuit of the novel photovoltaic fast shutdown device according to claim 2, characterized in that, The MCU is an LME3281 chip.

4. The control circuit of the novel photovoltaic fast shutdown device according to claim 1, characterized in that, The DC-DC power supply circuit includes a unidirectional conduction single-channel and filter circuit, a DC-DC power chip, an energy storage filter circuit, and output and feedback circuits. The DC-DC power chip is connected to the unidirectional conduction single-channel and filter circuit, the energy storage filter circuit and output, and the feedback circuit, respectively. The energy storage filter circuit and output are connected to the feedback circuit. The unidirectional conduction single-path and filtering circuit is used to prevent the DC-DC power supply circuit from being reverse-connected and to filter the external photovoltaic input voltage. The DC-DC power chip is used to convert the photovoltaic input voltage into an output voltage; The energy storage filter circuit and its output are used to output the output voltage converted by the DC-DC power chip; The feedback circuit is used to ensure the stability of the DC-DC power supply circuit.

5. The control circuit of the novel photovoltaic fast shutdown device according to claim 1, characterized in that, The MOS driving circuit includes a dual-transistor circuit, an inverting circuit, and an output protection circuit. The dual transistor circuit is connected to the inverting circuit and the output protection circuit, respectively. The dual transistor circuit is used to receive the voltage provided by the DC-DC power supply circuit and control the voltage output to the MOS circuit. The reverse circuit is used to control the MOS circuit to perform switching or closing operations; The output protection circuit is used to protect the MOS drive circuit.

6. The control circuit of the novel photovoltaic fast shutdown device according to claim 5, characterized in that, The dual-transistor circuit incorporates a common transistor for gate drive, controlling the voltage output to the MOS circuit.

7. The control circuit of the novel photovoltaic fast shutdown device according to claim 5, characterized in that, The reverse circuit includes multiple resistors and at least one transistor.

8. The control circuit of the novel photovoltaic fast shutdown device according to claim 5, characterized in that, The output protection circuit includes multiple diodes, multiple resistors, and at least one capacitor.

9. The control circuit of the novel photovoltaic fast shutdown device according to claim 1, characterized in that, The MOS circuit includes two MOS transistors.

10. The control circuit of the novel photovoltaic fast shutdown device according to claim 1, characterized in that, The main chip control circuit is also used to send the internal information of the control circuit to the carrier coupling circuit; the carrier coupling circuit is also used to transmit the internal information to an external information device.

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