Power systems, power converters, and component control devices

Abstract

This application discloses a power system, a power converter, and a component control device. The power system includes a power converter and a DC string. The power converter includes a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal. The DC string includes at least one component control device. The output terminals of each component control device in the DC string are connected in series to the DC terminal. The component control device includes a second auxiliary power circuit, which includes a first input side. The power converter, in response to a start-up signal from at least one component control device, controls the first output side of the first auxiliary power circuit to output a specified DC power. The component control device, in response to receiving the specified DC power at the first input side of the second auxiliary power circuit and the input voltage at the first input side being greater than the minimum start-up voltage of the component control device, performs a start-up action. Therefore, the component control device can operate normally under poor lighting conditions.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a power system, power converter, and component control device. Background Technology

[0002] In photovoltaic (PV) systems, MLPE (Module-Level Power Electronics) devices, such as shut-off switches and optimizers, are used to control PV modules to improve the power generation efficiency and safety of the PV system. The electrical energy required for MLPE operation is drawn from the PV modules connected to them. Under good sunlight conditions, the PV modules can generate sufficient voltage, allowing the MLPE devices to operate based on this voltage. However, under poor sunlight conditions, the PV modules cannot generate sufficient voltage, thus preventing the MLPE devices from functioning properly. Summary of the Invention

[0003] This disclosure aims to at least partially address one of the technical problems in the related art. To this end, one object of this disclosure is to provide a power system that, by controlling a first auxiliary power source circuit to generate a specified direct current according to an AC power network, causes a component control device to perform a start-up action in response to the specified direct current, thereby enabling the component control device to start up under poor lighting conditions and operate normally under such conditions.

[0004] The second objective of this disclosure is to propose a power converter.

[0005] The third objective of this disclosure is to propose a control method for a power converter.

[0006] The fourth objective of this disclosure is to provide a component control device.

[0007] The fifth objective of this disclosure is to provide a control method for a component control device.

[0008] To achieve the above objectives, a power system is provided according to a first aspect of this disclosure, comprising: a power converter and a DC string; the power converter includes a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal, wherein the input side of the main power circuit is connected to the DC terminal, the output side of the main power circuit is connected to the AC terminal, and the AC terminal is used to connect to an AC power network; the input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal; the DC string includes at least one component control device; the input terminal of the component control device is used to connect to at least one DC power source, and the output terminals of each component control device in the DC string are connected in series to the DC terminal; the component control device includes a second auxiliary power circuit, the second auxiliary power circuit including a first input side; the first input side is connected to the output terminal of the component control device; the power converter is used to control the first output side of the first auxiliary power circuit to output a specified DC power in response to a start-up signal of at least one component control device; the component control device is used to perform a start-up action in response to the first input side of the second auxiliary power circuit receiving the specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device.

[0009] The power system according to an embodiment of this disclosure includes a power converter and a DC string. The power converter includes a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal. The input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal. The power converter is used to control the first auxiliary power circuit to generate a specified DC current according to the AC power network and output the specified DC current from the first output side of the first auxiliary power circuit in response to a start-up signal from at least one component control device. The component control device is used to perform a start-up action in response to receiving the specified DC current at the first input side of the second auxiliary power circuit and the input voltage at the first input side being greater than the minimum start-up voltage of the component control device. Thus, when the lighting conditions are poor, the first auxiliary power circuit generates the specified DC current according to the AC power network to start the component control device, thereby energizing and starting the component control device. This achieves the goal of controlling the component control device to start under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0010] According to one embodiment of this disclosure, the first auxiliary power source circuit includes: a rectifier circuit and a first DC-DC converter circuit; the input terminal of the rectifier circuit is connected to the AC terminal; the input terminal of the first DC-DC converter circuit is connected to the output terminal of the rectifier circuit, and the output terminal of the first DC-DC converter circuit is connected to the DC terminal; a power converter is further configured to control the first DC-DC converter circuit to perform voltage conversion on the initial DC power output by the rectifier circuit to generate a specified DC power.

[0011] According to one embodiment of this disclosure, the first auxiliary power source circuit further includes: a second DC-DC converter circuit; the input terminal of the second DC-DC converter circuit is connected to the output terminal of the rectifier circuit; the second DC-DC converter circuit is used to perform voltage conversion on the initial DC power to generate DC power; the power converter is also used to control the first DC-DC converter circuit to perform voltage conversion on the initial DC power in response to the DC power output by the second DC-DC converter circuit.

[0012] According to one embodiment of this disclosure, the specified DC voltage is greater than or equal to the product of the number of component control devices in the DC string and the minimum start-up voltage of the component control devices; and / or the specified DC voltage is less than or equal to the product of the number of component control devices in the DC string and the maximum start-up voltage of the component control devices.

[0013] According to one embodiment of this disclosure, the second auxiliary power supply circuit further includes a second input side; the second input side is connected to the input terminal of the component control device; the component control device is configured to perform a start-up action in response to an input voltage of at least one of the first input side and the second input side being greater than the minimum start-up voltage of the component control device.

[0014] According to one embodiment of this disclosure, the component control device further includes a sampling circuit; the sampling circuit is used to sample the electrical parameters of the component control device; the component control device is also used to send the electrical parameters to a power converter; the power converter is also used to determine whether at least one component control device has failed based on the electrical parameters of at least one component control device when receiving the electrical parameters of at least one component control device, and to issue a fault alarm message when at least one component control device has failed.

[0015] According to one embodiment of this disclosure, the component control device further includes a sampling circuit; the sampling circuit is used to sample the electrical parameters of the component control device; the component control device is also used to determine whether a fault has occurred in the component control device based on the electrical parameters, and in the event of a fault in the component control device, generate fault information and send the fault information to the power converter; the power converter is also used to issue a fault alarm message upon receiving fault information from at least one component control device.

[0016] According to one embodiment of this disclosure, the power converter is further configured to send a target software upgrade package to a component control device after controlling the output of a specified DC power from the first output side of the first auxiliary power source circuit; the component control device is further configured to perform a software upgrade upon receiving the target software upgrade package.

[0017] To achieve the above objectives, a power converter is provided according to a second aspect of this disclosure, comprising: a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal; the DC terminal is used to connect to a DC string, the input side of the main power circuit is connected to the DC terminal, the output side of the main power circuit is connected to the AC terminal, and the AC terminal is used to connect to an AC power network; the input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal; wherein, the DC string includes at least one component control device, the input terminal of the component control device is used to connect to at least one DC power supply, the output terminals of each component control device in the DC string are connected in series to the DC terminal, the component control device includes a second auxiliary power circuit, the second auxiliary power circuit includes a first input side, the first input side is connected to the output terminal of the component control device; the power converter is used to control the first output side of the first auxiliary power circuit to output a specified DC power in response to a start-up signal of at least one component control device, so that the component control device receives the specified DC power in response to the first input side of the second auxiliary power circuit, and the input voltage of the first input side is greater than the minimum start-up voltage of the component control device, and then performs a start-up operation.

[0018] According to an embodiment of this disclosure, a power converter includes a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal. The input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal. The power converter is used to control the first auxiliary power circuit to generate a specified DC current according to an AC power network and output the specified DC current from the first output side of the first auxiliary power circuit in response to a start-up signal from at least one component control device. The component control device is used to perform a start-up action in response to receiving the specified DC current at the first input side of the second auxiliary power circuit and the input voltage at the first input side being greater than the minimum start-up voltage of the component control device. Thus, when the lighting conditions are poor, the first auxiliary power circuit generates the specified DC current according to the AC power network to start the component control device, thereby enabling the component control device to be powered on and started, achieving the goal of controlling the component control device to start up under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0019] To achieve the above objectives, a control method for a power converter is proposed according to a third aspect of this disclosure. The power converter includes: a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal; the DC terminal is used to connect to a DC string, the input side of the main power circuit is connected to the DC terminal, the output side of the main power circuit is connected to the AC terminal, and the AC terminal is used to connect to an AC power network; the input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal; wherein, the DC string includes at least one component control device, the input terminal of the component control device is used to connect to at least one DC power supply, the output terminals of each component control device in the DC string are connected in series to the DC terminal, the component control device includes a second auxiliary power circuit, the second auxiliary power circuit includes a first input side, the first input side is connected to the output terminal of the component control device; the method includes: in response to a start-up signal of at least one component control device, controlling the first output side of the first auxiliary power circuit to output a specified DC power, so that the component control device receives the specified DC power in response to the first input side of the second auxiliary power circuit, and after the input voltage of the first input side is greater than the minimum start-up voltage of the component control device, performing a start-up action.

[0020] According to the control method of the power converter according to the embodiments of the present disclosure, in response to the start-up signal of at least one component control device, the first output side of the first auxiliary power source circuit is controlled to output a specified DC power, so that the component control device receives the specified DC power at the first input side of the second auxiliary power source circuit, and the input voltage of the first input side is greater than the minimum start-up voltage of the component control device, and then performs a start-up action. The power converter includes a DC terminal, a main power circuit, a first auxiliary power source circuit, and an AC terminal. The input side of the first auxiliary power source circuit is connected to the AC terminal, and the first output side of the first auxiliary power source circuit is connected to the DC terminal. The power converter is used to control the first auxiliary power source circuit to generate the specified DC power according to the AC power network in response to the start-up signal of at least one component control device, and output the specified DC power from the first output side of the first auxiliary power source circuit. Therefore, when the lighting conditions are poor, the first auxiliary power source circuit generates the specified DC power according to the AC power network to start the component control device, thereby enabling the component control device to be powered on and started, realizing the control of the component control device to start under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0021] To achieve the above objectives, a component control device is provided according to a fourth aspect of this disclosure. The input terminal of the component control device is used to connect to at least one DC power supply, and the output terminal of the component control device is connected in series with the output terminals of the remaining component control devices in the DC string and then connected to the DC terminal of a power converter. The component control device includes: a second auxiliary power supply circuit; the second auxiliary power supply circuit includes a first input side connected to the output terminal of the component control device; wherein, the power converter includes a DC terminal, a main power circuit, a first auxiliary power supply circuit, and an AC terminal; the input side of the main power circuit is connected to the DC terminal, and the output side of the main power circuit is connected to the AC terminal, the AC terminal being used to connect to an AC power network; the input side of the first auxiliary power supply circuit is connected to the AC terminal, and the first output side of the first auxiliary power supply circuit is connected to the DC terminal; the power converter is used to control the first output side of the first auxiliary power supply circuit to output a specified DC power in response to a start-up signal from at least one component control device; the component control device is used to perform a start-up operation in response to the first input side of the second auxiliary power supply circuit receiving the specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device.

[0022] According to an embodiment of the component control device of this disclosure, the input terminal of the component control device is used to connect to at least one DC power supply, and the output terminal of the component control device is connected in series with the output terminals of the remaining component control devices in the DC string and then connected to the DC terminal of a power converter. The power converter includes a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal. The input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal. The power converter is used to control the first auxiliary power circuit to generate a specified DC current according to the AC power network and output the specified DC current from the first output side of the first auxiliary power circuit in response to a start-up signal of at least one component control device. The component control device is used to perform a start-up action in response to receiving the specified DC current at the first input side of the second auxiliary power circuit and the input voltage at the first input side being greater than the minimum start-up voltage of the component control device. Thus, when the lighting conditions are poor, the first auxiliary power circuit generates the specified DC current according to the AC power network to start the component control device, thereby enabling the component control device to be powered on and started, realizing the control of the component control device to start under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0023] To achieve the above objectives, a control method for a component control device is proposed according to a fifth aspect embodiment of this disclosure. The input terminal of the component control device is used to connect to at least one DC power supply, and the output terminal of the component control device is connected in series with the output terminals of the remaining component control devices in the DC string and then connected to the DC terminal of a power converter. The component control device includes: a second auxiliary power supply circuit; the second auxiliary power supply circuit includes a first input side, which is connected to the output terminal of the component control device; wherein, the power converter includes a DC terminal, a main power circuit, a first auxiliary power supply circuit, and an AC terminal; the input side of the main power circuit is connected to the DC terminal, and the output side of the main power circuit is connected to the AC terminal, which is used to connect to an AC power network; the input side of the first auxiliary power supply circuit is connected to the AC terminal, and the first output side of the first auxiliary power supply circuit is connected to the DC terminal; the power converter is used to control the first output side of the first auxiliary power supply circuit to output a specified DC power in response to a start-up signal of at least one component control device; the method includes: in response to the first input side of the second auxiliary power supply circuit receiving the specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device, performing a start-up action.

[0024] According to the control method of the component control device according to the embodiments of this disclosure, in response to the first input side of the second auxiliary power supply circuit receiving a specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device, a start-up action is performed. The input terminal of the component control device is used to connect to at least one DC power supply. The output terminal of the component control device is connected in series with the output terminals of the remaining component control devices in the DC string and then connected to the DC terminal of a power converter. The power converter includes a DC terminal, a main power circuit, a first auxiliary power supply circuit, and an AC terminal. The input side of the first auxiliary power supply circuit is connected to the AC terminal, and the first output side of the first auxiliary power supply circuit is connected to the DC terminal. The power converter is used to control the first auxiliary power supply circuit to generate a specified DC power according to the AC power network and output the specified DC power from the first output side of the first auxiliary power supply circuit in response to a start-up signal from at least one component control device. Therefore, when the lighting conditions are poor, the first auxiliary power supply circuit generates a specified DC power according to the AC power network to start the component control device, thereby enabling the component control device to be powered on and started, achieving the goal of controlling the component control device to start under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0025] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a power system according to an embodiment of the present disclosure; Figure 2This is a schematic diagram of the power system structure when the component control device is a photovoltaic optimizer, according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the power system structure when the component control device is a photovoltaic switch, according to an embodiment of the present disclosure; Figure 4 This is a schematic diagram of the structure of a first auxiliary source circuit according to an embodiment of the present disclosure; Figure 5 This is a schematic diagram of the structure of a first auxiliary source circuit according to another embodiment of the present disclosure; Figure 6 This is a schematic diagram of the structure of a power system according to another embodiment of the present disclosure; Figure 7 This is a schematic diagram of the structure of a power system according to another embodiment of the present disclosure; Figure 8 This is a schematic flowchart of a control method for a power converter according to an embodiment of the present disclosure; Figure 9 This is a flowchart illustrating a control method for a component control device according to an embodiment of the present disclosure. Detailed Implementation

[0027] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0028] The following description, with reference to the accompanying drawings, describes an embodiment of a power system, a power converter and its control method, and a component control device and its control method.

[0029] Figure 1 This is a schematic diagram of the structure of a power system according to an embodiment of the present disclosure. Figure 1 As shown, the power system includes: a power converter 100 and a DC string 200.

[0030] The power converter 100 includes DC terminals A1-A4, a main power circuit 110, a first auxiliary power circuit 120, and AC terminals B1-B2. The input side of the main power circuit 110 is connected to the DC terminals A1-A4, and the output side of the main power circuit 110 is connected to the AC terminals B1-B2. The AC terminals B1-B2 are used to connect to the AC power network 300. The input side of the first auxiliary power circuit 120 is connected to the AC terminals B1-B2, and the first output side of the first auxiliary power circuit 120 is connected to the DC terminals A1-A4. The DC string 200 includes at least one component control device 210. The input terminal of the component control device 210 is used to connect to at least one DC power supply 400. The output terminals of each component control device 210 in component 0 are connected in series to DC terminals A1-A4; the component control device 210 includes a second auxiliary power supply circuit 211, which includes a first input side; the first input side is connected to the output terminal of the component control device 210; the power converter 100 is used to control the first output side of the first auxiliary power supply circuit 120 to output a specified DC power in response to a start-up signal from at least one component control device 210; the component control device 210 is used to perform a start-up action in response to the first input side of the second auxiliary power supply circuit 211 receiving the specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device 210.

[0031] Specifically, the power system includes a power converter 100 and at least one DC string 200. Each DC string 200 includes at least one component control device 210. The input terminal of each component control device 210 is used to connect to at least one DC power supply 400, wherein the DC power supply 400 includes, but is not limited to, photovoltaic modules, batteries, or fuel cells. When the power system is operating normally, the main power circuit 110 generates AC power based on the voltage input at DC terminals A1-A4 and outputs it through AC terminals B1-B2.

[0032] The start-up signal of the component control device 210 indicates that the corresponding component control device 210 needs to be started and enter the working state. In response to the start-up signal of at least one component control device 210, the power converter 100 controls the first output side of the first auxiliary power source circuit 120 to output a specified DC power. Because the input side of the first auxiliary power source circuit 120 is connected to AC terminals B1-B2, which are used to connect to the AC power network 300, the first auxiliary power source circuit 120 can generate the specified DC power according to the AC power from the AC power network 300 and output the specified DC power to DC terminals A1 and A3. The first input side of the second auxiliary power source circuit 211 is connected to the output terminal of the component control device 210, and the output terminals of each component control device 210 are connected in series to DC terminals A1-A4. Therefore, the specified DC power can be reverse-fed to the first input side of the second auxiliary power source circuit 211 through DC terminals A1 and A3, thereby enabling the first input side of the second auxiliary power source circuit 211 to receive the specified DC power. When the input voltage on the first input side is greater than the minimum start-up voltage of the component control device 210, the component control device 210 can start normally and thus perform the start-up action.

[0033] It should be noted that the number of DC string 200 is not limited. Figure 1 The two shown can also be other quantities. Figure 1 This is merely an example and is not intended to limit the scope of this application.

[0034] For example, the component control device 210 can be one of a photovoltaic optimizer and a photovoltaic shut-off device. The first input side of the second auxiliary power source circuit 211 can also be connected to the input terminal of the component control device 210. The specified DC power can be reverse-fed to the input terminal of the component control device 210 through the reverse parallel diode of the power device in the photovoltaic optimizer and the photovoltaic shut-off device, so that the first input side of the second auxiliary power source circuit 211 receives the specified DC power.

[0035] by Figure 2Taking a photovoltaic optimizer as an example, the component control device 210 shown includes a first switch Q1, a second switch Q2, a first inductor L1, and a first diode D1. The first end of the first switch Q1 is connected to one end of the DC power supply 400. The first end of the second switch Q2 is connected to the second end of the first switch Q1, and the second end of the second switch Q2 is connected to the other end of the DC power supply 400. One end of the first inductor L1 is connected to the second end of the first switch Q1, and the other end of the first inductor L1 is the output terminal of the component control device 210. The cathode of the first diode D1 is connected to the other end of the first inductor L1, and the cathode of the first diode D1 is connected to the second end of the second switch Q2. The first input side of the second auxiliary power supply circuit 211 is connected to the first end of the first switch Q1 and the second end of the second switch Q2. When the first auxiliary power supply circuit 120 outputs a specified DC power to the DC terminals A1 and A3, the specified DC power is input to the first input side of the second auxiliary power supply circuit 211 through the reverse parallel diode of the first inductor L1 and the first switch Q1.

[0036] by Figure 3 Taking a photovoltaic switch as an example, the component control device 210 shown includes a third switch Q3 and a second diode D2. The first terminal of the third switch Q3 is connected to one end of the DC power supply 400, and the second terminal of the third switch Q3 is the output terminal of the component control device 210. The cathode of the second diode D2 is connected to the second terminal of the third switch Q3, and the anode of the second diode D2 is connected to the other end of the DC power supply 400. The second auxiliary power supply circuit 211 connects the first terminal of the third switch Q3 and the anode of the second diode D2. When the first auxiliary power supply circuit 120 outputs a specified DC power to the DC terminals A1 and A3, the specified DC power is input to the first input side of the second auxiliary power supply circuit 211 through the anti-parallel diode of the third switch Q3.

[0037] In the above embodiments, by controlling the first auxiliary power source circuit to generate a specified DC power according to the AC power network, the component control device is made to respond to the specified DC power to perform a start-up action, thereby realizing the control of the component control device to start up under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0038] In one alternative implementation, the power converter 100 is further configured to control the first output side of the first auxiliary power source circuit 120 to output a specified DC power according to a preset fault detection time and a preset software upgrade time.

[0039] It is understood that the preset fault detection time is the time for the component control device 210 to perform fault detection, and the preset software upgrade time is the time for the component control device 210 to perform software upgrade. When the current time reaches at least one of the preset fault detection time and the preset software upgrade time, the power converter 100 controls the first output side of the first auxiliary power supply circuit 120 to output a specified DC power to start the component control device 210. After the component control device 210 starts, it performs fault detection and / or software upgrade.

[0040] It should be noted that the preset fault detection time and preset software upgrade time can be set according to actual needs. For example, the preset fault detection time can be at night, such as 11 PM. When the current time reaches 11 PM, the power converter 100 outputs a specified DC power to enable the component control device 210 to start and perform fault detection, so that the component control device 210 will not perform fault detection during normal working hours.

[0041] Therefore, the power converter can output a specified DC power at night according to the preset fault detection time and preset software upgrade time, so that the component control equipment can perform fault detection and software upgrade at night without occupying the normal working time of the component control equipment, thereby improving the working efficiency of the power system.

[0042] In another alternative implementation, when the power converter 100 is used to connect to a host computer, the start signal can be at least one of a fault detection command and a software upgrade command sent by the host computer. The power converter 100 can also output specified DC power according to at least one of the fault detection command and the software upgrade command sent by the host computer to start the component control device 210.

[0043] In some embodiments, such as Figure 4 As shown, the first auxiliary power source circuit 120 includes: a rectifier circuit 121 and a first DC-DC converter circuit 122; wherein, the input terminal of the rectifier circuit 121 is connected to the AC terminals B1-B2; the input terminal of the first DC-DC converter circuit 122 is connected to the output terminal of the rectifier circuit 121, and the output terminal of the first DC-DC converter circuit 122 is connected to the DC terminals A1-A4; the power converter 100 is also used to control the first DC-DC converter circuit 122 to perform voltage conversion on the initial DC power output by the rectifier circuit 121 to generate a specified DC power.

[0044] Specifically, the input terminal of the rectifier circuit 121 is connected to the AC terminals B1-B2, and the AC terminals B1-B2 are connected to the AC network 300. Therefore, the input terminal of the rectifier circuit 121 is connected to the AC network 300 to rectify the AC network 300, generate initial DC power, and provide the initial DC power to the first DC-DC converter circuit 122. The power converter 100 adjusts the voltage value of the initial DC power by controlling the first DC-DC converter circuit 122, thereby generating the specified DC power.

[0045] For example, the first DC-DC converter circuit 122 may include a boost circuit, and the power converter 100 can adjust the voltage value of the initial DC current by adjusting the operating frequency of the switching transistor in the boost circuit, thereby generating a specified DC current.

[0046] In the above embodiment, since the rectifier circuit is connected to the AC power network and is not affected by the lighting conditions, the rectifier circuit can output an initial DC power when the lighting conditions are poor. The first DC-DC converter circuit can output a specified DC power based on the initial DC power, thereby enabling the component control device to start when the lighting conditions are poor.

[0047] In some embodiments, such as Figure 5 As shown, the first auxiliary power source circuit 120 further includes: a second DC-DC converter circuit 123; the input terminal of the second DC-DC converter circuit 123 is connected to the output terminal of the rectifier circuit 121; the second DC-DC converter circuit 123 is used to perform voltage conversion on the initial DC power to generate DC power; the power converter 100 is also used to control the first DC-DC converter circuit 122 to perform voltage conversion on the initial DC power in response to the DC power output by the second DC-DC converter circuit 123.

[0048] For example, such as Figure 5 As shown, the first auxiliary power supply circuit 120 also includes a controller 124, which controls the first DC-DC converter circuit 122. Therefore, the first auxiliary power supply circuit 120 also needs to supply power to the controller 124. When the controller 124 is powered on, it controls the first DC-DC converter circuit 122 to output a specified DC power to start the component control device 210. Specifically, the first auxiliary power supply circuit 120 also includes a second DC-DC converter circuit 123. The second DC-DC converter circuit 123 performs voltage conversion on the initial DC power to generate the power supply for the controller 124, i.e., DC power. Then, the controller 124 is powered on and starts, controlling the first DC-DC converter circuit 122 to perform voltage conversion on the initial DC power.

[0049] In the above embodiments, the second DC-DC converter circuit can supply power to the controller in the power converter under poor lighting conditions, so that the controller can start up and control the first DC-DC converter circuit, thereby enabling the component control device to start up under poor lighting conditions.

[0050] To ensure that the component control device 210 can start normally, in some embodiments, the specified DC voltage is greater than or equal to the product of the number of component control devices 210 in the DC string 200 and the minimum start-up voltage of the component control device 210.

[0051] It is understandable that the minimum startup voltage of the component control device 210 is the minimum operating voltage of the component control device 210. For example, assuming that the operating voltage range of the component control device 210 is 12V~120V, then the minimum startup voltage of the component control device 210 is 12V. If there are 10 component control devices 210 in the DC string 200, in order to ensure that the voltage of the first input of each component control device 210 is greater than or equal to 12V, the specified DC voltage needs to be greater than or equal to 10*12V, that is, the specified DC voltage is greater than or equal to 120V.

[0052] To prevent damage to the component control device 210 due to excessive voltage, in some embodiments, the specified DC voltage is less than or equal to the product of the number of component control devices 210 in the DC string 200 and the maximum start-up voltage of the component control device 210.

[0053] It is understandable that the maximum startup voltage of the component control device 210 is the maximum operating voltage of the component control device 210. For example, assuming that the operating voltage range of the component control device 210 is 12V~120V, then the maximum startup voltage of the component control device 210 is 120V. If there are 10 component control devices 210 in the DC string 200, in order to avoid each component control device 210 being subjected to excessive voltage, the specified DC voltage needs to be less than or equal to 10*120V, that is, the specified DC voltage is less than or equal to 1200V.

[0054] It should be noted that the number of component control devices 210 in each DC string 200 is the same, so that the power converter 100 can work normally. If the number of component control devices 210 in each DC string 200 is different, the power converter 100 will issue a fault alarm message.

[0055] In some embodiments, such as Figure 6As shown, the second auxiliary power supply circuit 211 also includes a second input side; the second input side is connected to the input terminal of the component control device 210; the component control device 210 is used to perform a start-up action in response to the input voltage of at least one of the first input side and the second input side being greater than the minimum start-up voltage of the component control device 210.

[0056] Specifically, the second input side of the second auxiliary power source circuit 211 is connected to the input terminal of the component control device 210, that is, it is used to connect at least a DC power supply 400. Therefore, when the input voltage of the DC power supply 400 is greater than the minimum start-up voltage of the component control device 210, the component control device 210 can also be started.

[0057] Taking the DC power supply 400 as an example of a photovoltaic module, when the light conditions are good, the output voltage of the photovoltaic module is greater than the minimum start-up voltage of the module control device 210. At this time, the module control device 210 can respond to the output voltage of the photovoltaic module and perform a start-up action. When the light conditions are poor, the output voltage of the photovoltaic module is less than the minimum start-up voltage of the module control device 210. At this time, the module control device 210 can respond to the specified DC power output by the first auxiliary power supply circuit 120 and perform a start-up action.

[0058] In this embodiment, the component control device has two startup methods: one is to start in response to a DC power supply, and the other is to start in response to a specified DC power output from the first auxiliary power source circuit. When one startup method fails, the other startup method can still work normally, thereby improving the reliability of the power system.

[0059] In some embodiments, such as Figure 7 As shown, the component control device 210 also includes a sampling circuit 212; the sampling circuit 212 is used to sample the electrical parameters of the component control device 210.

[0060] After the component control device 210 is started, the sampling circuit 212 samples the electrical parameters of the component control device 210, including current signals, voltage signals, and reactance. Based on the electrical parameters of the component control device 210, it can be determined whether the power devices, diodes, and reactors of the component control device 210 have malfunctioned. For example, changes in the current signal can determine whether a power device has an open-circuit or short-circuit fault, or changes in the voltage signal can determine whether a capacitor has malfunctioned. When the component control device 210 detects a fault, it issues a fault alarm message, thereby realizing fault detection of the component control device 210. The specific implementation methods are as follows: The first type: the component control device 210 is also used to send electrical parameters to the power converter 100; the power converter 100 is also used to, upon receiving the electrical parameters of at least one component control device 210, determine whether at least one component control device 210 has malfunctioned based on the electrical parameters of at least one component control device 210, and issue a fault alarm message if at least one component control device 210 has malfunctioned.

[0061] The first method involves the power converter 100 determining whether the component control device 210 has malfunctioned. Specifically, after acquiring the electrical parameters sampled by the sampling circuit 212, the component control device 210 sends the electrical parameters to the power converter 100. Based on the received electrical parameters from the component control device 210, the power converter 100 can determine whether the corresponding component control device 210 has malfunctioned, and if the corresponding component control device 210 has malfunctioned, it will issue a fault alarm message.

[0062] The second type: the component control device 210 is also used to determine whether the component control device 210 has failed based on electrical parameters, and in the event of a failure of the component control device 210, generate fault information and send the fault information to the power converter 100; the power converter 100 is also used to issue a fault alarm message when it receives fault information from at least one component control device 210.

[0063] The second method involves the component control device 210 determining whether it has malfunctioned. Specifically, after acquiring the electrical parameters sampled by the sampling circuit 212, the component control device 210 determines whether it has malfunctioned based on the electrical parameters. If it has malfunctioned, it sends fault information to the power converter 100. Upon receiving the fault information, the power converter 100 issues a fault alarm.

[0064] In the above embodiments, after the component control device is powered on, the sampling circuit can perform sampling and perform fault detection on the component control device based on the electrical parameters sampled by the sampling circuit, thereby realizing fault detection of the component control device under poor lighting conditions; and the power converter can collect electrical parameters or fault information of each component control device, thereby realizing centralized monitoring of the entire power system.

[0065] In some embodiments, the power converter 100 is further configured to send a target software upgrade package to the component control device 210 after controlling the output of a specified DC power on the first output side of the first auxiliary power source circuit 120; the component control device 210 is further configured to perform a software upgrade upon receiving the target software upgrade package.

[0066] Specifically, after the power converter 100 outputs a specified DC power on the first output side of the first auxiliary power source circuit 120, the component control device 210 is powered on and starts working. The power converter 100 sends the target software upgrade package to the component control device 210, and the component control device 210 performs a software upgrade after receiving the target software package.

[0067] Optionally, the target software package may be determined by the power converter 100 based on the received upgrade instructions or the fault information described above.

[0068] In the above embodiments, after the component control device is powered on, the power converter can send a software upgrade package to the component control device to upgrade the software of the component control device, thereby realizing the software upgrade of the component control device under poor lighting conditions.

[0069] In summary, according to the power system of this disclosure embodiment, the power converter is used to control the first auxiliary power supply circuit to generate a specified DC power according to the AC power network in response to a start-up signal of at least one component control device, and output the specified DC power from the first output side of the first auxiliary power supply circuit. The component control device is used to perform a start-up action in response to receiving the specified DC power at the first input side of the second auxiliary power supply circuit and the input voltage at the first input side being greater than the minimum start-up voltage of the component control device. Thus, when the lighting conditions are poor, the first auxiliary power supply circuit generates the specified DC power according to the AC power network to start the component control device, thereby enabling the component control device to be powered on and started, realizing the control of the component control device to start under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0070] Corresponding to the above embodiments, embodiments of this disclosure also provide a power converter. For example... Figure 1As shown, the power converter 100 includes: DC terminals A1-A4, a main power circuit 110, a first auxiliary power circuit 120, and AC terminals B1-B2; DC terminals A1-A4 are used to connect to a DC string 200, the input side of the main power circuit 110 is connected to DC terminals A1-A4, the output side of the main power circuit 110 is connected to AC terminals B1-B2, and AC terminals B1-B2 are used to connect to an AC power network 300; the input side of the first auxiliary power circuit 120 is connected to AC terminals B1-B2, and the first output side of the first auxiliary power circuit 120 is connected to DC terminals A1-A4; wherein, the DC string 200 includes at least one component control device 210, and the input terminal of the component control device 210 is used to connect to at least one DC power supply. The output terminals of each component control device 210 in the DC power supply 400 and the DC string 200 are connected in series to DC terminals A1-A4. The component control device 210 includes a second auxiliary power supply circuit 211, which includes a first input side connected to the output terminal of the component control device 210. The power converter 100 is used to control the first output side of the first auxiliary power supply circuit 120 to output a specified DC power in response to a start-up signal from at least one component control device 210, so that the component control device 210 receives the specified DC power in response to the first input side of the second auxiliary power supply circuit 211, and the input voltage of the first input side is greater than the minimum start-up voltage of the component control device 210, and then performs a start-up action.

[0071] In some embodiments, the first auxiliary power source circuit 120 includes: a rectifier circuit 121 and a first DC-DC converter circuit 122; the input terminal of the rectifier circuit 121 is connected to AC terminals B1-B2; the input terminal of the first DC-DC converter circuit 122 is connected to the output terminal of the rectifier circuit 121, and the output terminal of the first DC-DC converter circuit 122 is connected to DC terminals A1-A4; the power converter 100 is further configured to control the first DC-DC converter circuit 122 to perform voltage conversion on the initial DC power output by the rectifier circuit 121 to generate a specified DC power.

[0072] In some embodiments, the first auxiliary power source circuit 120 further includes: a second DC-DC converter circuit 123; the input terminal of the second DC-DC converter circuit 123 is connected to the output terminal of the rectifier circuit 121; the second DC-DC converter circuit 123 is used to perform voltage conversion on the initial DC power to generate DC power; the power converter 100 is also used to control the first DC-DC converter circuit 122 to perform voltage conversion on the initial DC power in response to the DC power output by the second DC-DC converter circuit 123.

[0073] In some embodiments, the specified DC voltage is greater than or equal to the product of the number of component control devices 210 in the DC string 200 and the minimum start-up voltage of the component control devices 210; and / or the specified DC voltage is less than or equal to the product of the number of component control devices 210 in the DC string 200 and the maximum start-up voltage of the component control devices 210.

[0074] In some embodiments, the component control device 210 further includes a sampling circuit 212; the sampling circuit 212 is used to sample the electrical parameters of the component control device 210; the component control device 210 is also used to send the electrical parameters to the power converter 100; the power converter 100 is also used to, upon receiving the electrical parameters of at least one component control device 210, determine whether at least one component control device 210 has malfunctioned based on the electrical parameters, and issue a fault alarm message if at least one component control device 210 has malfunctioned; or the component control device 210 is also used to, upon determining whether the component control device 210 has malfunctioned based on the electrical parameters, generate fault information if the component control device 210 has malfunctioned, and send the fault information to the power converter 100; the power converter 100 is also used to issue a fault alarm message upon receiving fault information from at least one component control device 210.

[0075] In some embodiments, the power converter 100 is further configured to send a target software upgrade package to the component control device 210 after controlling the output of a specified DC power on the first output side of the first auxiliary power source circuit 120; the component control device 210 is further configured to perform a software upgrade upon receiving the target software upgrade package.

[0076] It should be noted that the specific implementation of the power converter in this embodiment corresponds one-to-one with the specific implementation of the power system in the aforementioned embodiment of this invention, and will not be repeated here.

[0077] According to the power converter of this disclosure embodiment, the power converter is configured to control a first auxiliary power supply circuit to generate a specified DC power according to an AC power network and output the specified DC power from a first output side of the first auxiliary power supply circuit in response to a start-up signal of at least one component control device. The component control device is configured to perform a start-up operation in response to receiving the specified DC power at a first input side of a second auxiliary power supply circuit and the input voltage at the first input side being greater than the minimum start-up voltage of the component control device. Thus, when the lighting conditions are poor, the first auxiliary power supply circuit generates the specified DC power according to the AC power network to start the component control device, thereby enabling the component control device to be powered on and started, achieving the goal of controlling the component control device to start up under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0078] Corresponding to the above embodiments, this disclosure also provides a control method for a power converter 100. For example... Figure 1As shown, the power converter 100 includes DC terminals A1-A4, a main power circuit 110, a first auxiliary power circuit 120, and AC terminals B1-B2. DC terminals A1-A4 are used to connect to a DC string 200. The input side of the main power circuit 110 is connected to DC terminals A1-A4, and the output side of the main power circuit 110 is connected to AC terminals B1-B2. AC terminals B1-B2 are used to connect to an AC power network 300. The input side of the first auxiliary power circuit 120 is connected to AC terminals B1-B2. The first output side of 120 is connected to DC terminals A1-A4; wherein, the DC string 200 includes at least one component control device 210, the input terminal of the component control device 210 is used to connect to at least one DC power supply 400, the output terminals of each component control device 210 in the DC string 200 are connected in series to DC terminals A1-A4, the component control device 210 includes a second auxiliary power supply circuit 211, the second auxiliary power supply circuit 211 includes a first input side, the first input side is connected to the output terminal of the component control device 210; like Figure 8 As shown, the control method for the power converter includes: S101, in response to the start-up signal of at least one component control device, the first output side of the first auxiliary power source circuit is controlled to output a specified DC power, so that the component control device receives the specified DC power on the first input side of the second auxiliary power source circuit and the input voltage on the first input side is greater than the minimum start-up voltage of the component control device, and then performs a start-up action.

[0079] In some embodiments, the first auxiliary power source circuit 120 includes: a rectifier circuit 121 and a first DC-DC converter circuit 122; the input terminal of the rectifier circuit 121 is connected to AC terminals B1-B2; the input terminal of the first DC-DC converter circuit 122 is connected to the output terminal of the rectifier circuit 121, and the output terminal of the first DC-DC converter circuit 122 is connected to DC terminals A1-A4; controlling the first output side of the first auxiliary power source circuit to output a specified DC power includes: controlling the first DC-DC converter circuit to perform voltage conversion on the initial DC power output by the rectifier circuit to generate the specified DC power.

[0080] In some embodiments, the first auxiliary power source circuit 120 further includes: a second DC-DC converter circuit 123; the input terminal of the second DC-DC converter circuit 123 is connected to the output terminal of the rectifier circuit 121; the second DC-DC converter circuit 123 is used to perform voltage conversion on the initial DC power to generate DC power; the method further includes: in response to the DC power output by the second DC-DC converter circuit, controlling the first DC-DC converter circuit to perform voltage conversion on the initial DC power.

[0081] In some embodiments, the specified DC voltage is greater than or equal to the product of the number of component control devices in the DC string and the minimum start-up voltage of the component control devices; and / or the specified DC voltage is less than or equal to the product of the number of component control devices in the DC string and the maximum start-up voltage of the component control devices.

[0082] In some embodiments, the component control device 210 further includes a sampling circuit 212; the sampling circuit 212 is used to sample the electrical parameters of the component control device 210; when the component control device is also used to send the electrical parameters to the power converter; the method further includes: upon receiving the electrical parameters of at least one component control device, determining whether at least one component control device has failed based on the electrical parameters of at least one component control device, and issuing a fault alarm message if at least one component control device has failed; or In the case where the component control device is also used to determine whether a fault has occurred in the component control device based on electrical parameters, and in the event of a fault in the component control device, generate fault information and send the fault information to the power converter; the method further includes: issuing a fault alarm message upon receiving fault information from at least one component control device.

[0083] In some embodiments, the method further includes: after controlling the first output side of the first auxiliary power source circuit to output a specified DC power, sending a target software upgrade package to the component control device, so that the component control device performs a software upgrade upon receiving the target software upgrade package.

[0084] It should be noted that the specific implementation method of the power converter control method in this embodiment of the invention corresponds one-to-one with the specific implementation method of the power system in the aforementioned embodiments of the invention, and will not be repeated here.

[0085] According to the control method of the power converter according to the embodiments of the present disclosure, the power converter is used to control a first auxiliary power supply circuit to generate a specified DC power according to an AC power network and output the specified DC power from a first output side of the first auxiliary power supply circuit in response to a start-up signal of at least one component control device. Thus, when the lighting conditions are poor, the first auxiliary power supply circuit generates the specified DC power according to the AC power network to start the component control device, thereby energizing and starting the component control device, achieving the goal of controlling the component control device to start under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0086] Corresponding to the above embodiments, embodiments of this disclosure also provide a component control device. For example... Figure 1As shown, the input terminal of the component control device 210 is used to connect to at least one DC power supply 400. The output terminal of the component control device 210 is connected in series with the output terminals of the remaining component control devices 210 in the DC string 200 and then connected to the DC terminals A1-A4 of the power converter 100. The component control device 210 includes a second auxiliary power supply circuit 211. The second auxiliary power supply circuit 211 includes a first input side, which is connected to the output terminal of the component control device 210. The power converter 100 includes DC terminals A1-A4, a main power circuit 110, a first auxiliary power supply circuit 120, and AC terminals B1-B2. The input side of the main power circuit 110 is connected to the DC terminals A1-A4. The output side of the power circuit 110 is connected to AC terminals B1-B2, which are used to connect to the AC power network 300. The input side of the first auxiliary power circuit 120 is connected to AC terminals B1-B2, and the first output side of the first auxiliary power circuit 120 is connected to DC terminals A1-A4. The power converter 100 is used to control the first output side of the first auxiliary power circuit 120 to output a specified DC power in response to the start-up signal of at least one component control device 210. The component control device 210 is used to perform a start-up action in response to the first input side of the second auxiliary power circuit 211 receiving the specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device 210.

[0087] In some embodiments, the specified DC voltage is greater than or equal to the product of the number of component control devices 210 in the DC string 200 and the minimum start-up voltage of the component control devices 210; and / or the specified DC voltage is less than or equal to the product of the number of component control devices 210 in the DC string 200 and the maximum start-up voltage of the component control devices 210.

[0088] In some embodiments, the second auxiliary power supply circuit 211 further includes a second input side; the second input side is connected to the input terminal of the component control device 210; the component control device 210 is configured to perform a start-up action in response to the input voltage of at least one of the first input side and the second input side being greater than the minimum start-up voltage of the component control device 210.

[0089] In some embodiments, the component control device 210 further includes a sampling circuit 212; the sampling circuit 212 is used to sample the electrical parameters of the component control device 210; the component control device 210 is also used to send the electrical parameters to the power converter 100; the power converter 100 is also used to, upon receiving the electrical parameters of at least one component control device 210, determine whether at least one component control device 210 has malfunctioned based on the electrical parameters, and issue a fault alarm message if at least one component control device 210 has malfunctioned; or the component control device 210 is also used to, upon determining whether the component control device 210 has malfunctioned based on the electrical parameters, generate fault information if the component control device 210 has malfunctioned, and send the fault information to the power converter 100; the power converter 100 is also used to issue a fault alarm message upon receiving fault information from at least one component control device 210.

[0090] In some embodiments, the power converter 100 is further configured to send a target software upgrade package to the component control device 210 after controlling the output of a specified DC power on the first output side of the first auxiliary power source circuit 120; the component control device 210 is further configured to perform a software upgrade upon receiving the target software upgrade package.

[0091] It should be noted that the specific implementation of the component control device in this embodiment corresponds one-to-one with the specific implementation of the power system in the aforementioned embodiment of this invention, and will not be repeated here.

[0092] According to the component control device of this disclosure, a power converter is configured to, in response to a start-up signal from at least one component control device, control a first auxiliary power supply circuit to generate a specified DC power according to an AC power network and output the specified DC power from a first output side of the first auxiliary power supply circuit. The component control device is configured to, in response to receiving the specified DC power at a first input side of a second auxiliary power supply circuit and the input voltage at the first input side being greater than the minimum start-up voltage of the component control device, perform a start-up operation. Thus, when lighting conditions are poor, the first auxiliary power supply circuit generates the specified DC power according to the AC power network to start the component control device, thereby energizing and starting the component control device. This achieves the goal of controlling the component control device to start up under poor lighting conditions, enabling the component control device to operate normally under such conditions.

[0093] Corresponding to the above embodiments, embodiments of this disclosure also provide a control method for a component control device. For example... Figure 1As shown, the input terminal of the component control device 210 is used to connect to at least one DC power supply 400. The output terminal of the component control device 210 is connected in series with the output terminals of the remaining component control devices 210 in the DC string 200 and then connected to the DC terminals A1-A4 of the power converter 100. The component control device 210 includes a second auxiliary power supply circuit 211. The second auxiliary power supply circuit 211 includes a first input side, which is connected to the output terminal of the component control device 210. The power converter 100 includes DC terminals A1-A4, a main power circuit 110, and a first auxiliary power supply circuit. The main power circuit 110 is connected to AC terminals B1-B2, and the input side of the main power circuit 110 is connected to DC terminals A1-A4. The output side of the main power circuit 110 is connected to AC terminals B1-B2, and AC terminals B1-B2 are used to connect to the AC power network 300. The input side of the first auxiliary power circuit 120 is connected to AC terminals B1-B2, and the first output side of the first auxiliary power circuit 120 is connected to DC terminals A1-A4. The power converter 100 is used to control the first output side of the first auxiliary power circuit 120 to output a specified DC power in response to the start-up signal of at least one component control device 210.

[0094] like Figure 9 As shown, the control method of the component control device includes: S201, in response to the first input side of the second auxiliary power source circuit receiving a specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device, a start-up action is performed.

[0095] In some embodiments, the specified DC voltage is greater than or equal to the product of the number of component control devices in the DC string and the minimum start-up voltage of the component control devices; and / or the specified DC voltage is less than or equal to the product of the number of component control devices in the DC string and the maximum start-up voltage of the component control devices.

[0096] In some embodiments, the second auxiliary power supply circuit 211 further includes a second input side; the second input side is connected to the input terminal of the component control device 210; the method further includes: performing a start-up action in response to the input voltage of at least one of the first input side and the second input side being greater than the minimum start-up voltage of the component control device.

[0097] In some embodiments, the component control device 210 further includes a sampling circuit 212; the sampling circuit 212 is used to sample the electrical parameters of the component control device 210; the method further includes: sending the electrical parameters to a power converter, so that the power converter, upon receiving the electrical parameters of at least one component control device, determines whether at least one component control device has failed based on the electrical parameters of at least one component control device, and issues a fault alarm message if at least one component control device has failed; or The system determines whether a component control device has malfunctioned based on electrical parameters, and generates fault information and sends the fault information to the power converter in the event of a malfunction, so that the power converter can issue a fault alarm message upon receiving fault information from at least one component control device.

[0098] In some embodiments, the method further includes: performing a software upgrade upon receiving a target software upgrade package sent by the power converter, wherein the power converter is further configured to send the target software upgrade package after controlling the output of a specified DC power on the first output side of the first auxiliary power source circuit.

[0099] It should be noted that the specific implementation method of the component control device in the embodiments of the present invention corresponds one-to-one with the specific implementation method of the power system in the foregoing embodiments of the present invention, and will not be repeated here.

[0100] According to the control method of the component control device according to the embodiments of the present disclosure, a power converter is used to control a first auxiliary power supply circuit to generate a specified DC power according to an AC power network in response to a start-up signal of at least one component control device, and to output the specified DC power from a first output side of the first auxiliary power supply circuit. Thus, when the lighting conditions are poor, the first auxiliary power supply circuit generates the specified DC power according to the AC power network to start the component control device, thereby energizing and starting the component control device, achieving the goal of controlling the component control device to start under poor lighting conditions, so that the component control device can operate normally under poor lighting conditions.

[0101] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0102] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0103] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0104] Furthermore, the terms "first," "second," etc., used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this disclosure can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this disclosure, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0105] In this disclosure, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing," etc., appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific implementation.

[0106] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A power system, characterized in that, include: Power converters and DC string converters; The power converter includes a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal. The input side of the main power circuit is connected to the DC terminal, and the output side of the main power circuit is connected to the AC terminal. The AC terminal is used to connect to an AC power network. The input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal. The DC string includes at least one component control device; the input terminal of the component control device is used to connect to at least one DC power supply, and the output terminals of each component control device in the DC string are connected in series to the DC terminal; the component control device includes a second auxiliary power supply circuit, and the second auxiliary power supply circuit includes a first input side; the first input side is connected to the output terminal of the component control device; The power converter is configured to control the first output side of the first auxiliary power source circuit to output a specified DC power in response to a start-up signal from at least one of the component control devices. The component control device is configured to perform a start-up action in response to the first input side of the second auxiliary power source circuit receiving the specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device.

2. The power system according to claim 1, characterized in that, The first auxiliary power source circuit includes: a rectifier circuit and a first DC-DC converter circuit; The input terminal of the rectifier circuit is connected to the AC terminal; the input terminal of the first DC-DC converter circuit is connected to the output terminal of the rectifier circuit, and the output terminal of the first DC-DC converter circuit is connected to the DC terminal. The power converter is also used to control the first DC-DC converter circuit to perform voltage conversion on the initial DC output of the rectifier circuit to generate the specified DC.

3. The power system according to claim 2, characterized in that, The first auxiliary power source circuit also includes: a second DC-DC converter circuit; The input terminal of the second DC-DC converter circuit is connected to the output terminal of the rectifier circuit; the second DC-DC converter circuit is used to perform voltage conversion on the initial DC current to generate the DC current. The power converter is also configured to control the first DC-DC converter to perform voltage conversion on the initial DC-DC power in response to the DC power output by the second DC-DC converter circuit.

4. The power system according to claim 1, characterized in that, The specified DC voltage is greater than or equal to the product of the number of component control devices in the DC string and the minimum start-up voltage of the component control devices; and / or The specified DC voltage is less than or equal to the product of the number of component control devices in the DC string and the maximum start-up voltage of the component control devices.

5. The power system according to claim 1, characterized in that, The second auxiliary power supply circuit also includes a second input side; the second input side is connected to the input terminal of the component control device; The component control device is configured to perform a start-up action in response to an input voltage on at least one of the first input side and the second input side being greater than the minimum start-up voltage of the component control device.

6. The power system according to any one of claims 1-5, characterized in that, The component control device further includes a sampling circuit; the sampling circuit is used to sample the electrical parameters of the component control device. The component control device is also used to send the electrical parameters to the power converter; The power converter is further configured to, upon receiving electrical parameters of at least one of the component control devices, determine whether at least one of the component control devices has malfunctioned based on the electrical parameters of at least one of the component control devices, and issue a fault alarm message if at least one of the component control devices has malfunctioned.

7. The power system according to any one of claims 1-5, characterized in that, The component control device further includes a sampling circuit; the sampling circuit is used to sample the electrical parameters of the component control device. The component control device is further configured to determine whether the component control device has malfunctioned based on the electrical parameters, and in the event of a malfunction in the component control device, generate fault information and send the fault information to the power converter. The power converter is also configured to issue a fault alarm message upon receiving fault information from at least one of the component control devices.

8. The power system according to any one of claims 1-5, characterized in that, The power converter is also used to send the target software upgrade package to the component control device after controlling the first output side of the first auxiliary power source circuit to output the specified DC power. The component control device is also used to perform a software upgrade upon receiving the target software upgrade package.

9. A power converter, characterized in that, include: DC terminal, main power circuit, first auxiliary power circuit, and AC terminal; The DC terminal is used to connect to a DC string. The input side of the main power circuit is connected to the DC terminal, and the output side of the main power circuit is connected to the AC terminal. The AC terminal is used to connect to an AC power network. The input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal. The DC string includes at least one component control device. The input terminal of the component control device is used to connect to at least one DC power supply. The output terminals of each component control device in the DC string are connected in series to the DC terminal. The component control device includes a second auxiliary power circuit. The second auxiliary power circuit includes a first input side, and the first input side is connected to the output terminal of the component control device. The power converter is configured to control the first output side of the first auxiliary power source circuit to output a specified DC power in response to a start-up signal from at least one of the component control devices, so that the component control device performs a start-up action after receiving the specified DC power at the first input side of the second auxiliary power source circuit and the input voltage at the first input side is greater than the minimum start-up voltage of the component control device.

10. A control method for a power converter, characterized in that, The power converter includes: a DC terminal, a main power circuit, a first auxiliary power circuit, and an AC terminal; the DC terminal is used to connect to a DC string, the input side of the main power circuit is connected to the DC terminal, the output side of the main power circuit is connected to the AC terminal, and the AC terminal is used to connect to an AC power network; the input side of the first auxiliary power circuit is connected to the AC terminal, and the first output side of the first auxiliary power circuit is connected to the DC terminal; wherein, the DC string includes at least one component control device, the input terminal of the component control device is used to connect to at least one DC power supply, the output terminals of each component control device in the DC string are connected in series to the DC terminal, the component control device includes a second auxiliary power circuit, the second auxiliary power circuit includes a first input side, and the first input side is connected to the output terminal of the component control device; the method includes: In response to a start-up signal from at least one of the component control devices, the first output side of the first auxiliary power source circuit is controlled to output a specified DC power, so that the component control device performs a start-up action after receiving the specified DC power at the first input side of the second auxiliary power source circuit and the input voltage at the first input side is greater than the minimum start-up voltage of the component control device.

11. A component control device, characterized in that, The input terminal of the component control device is used to connect to at least one DC power supply. The output terminal of the component control device is connected in series with the output terminals of the remaining component control devices in the DC string and then connected to the DC terminal of the power converter. The component control device includes: a second auxiliary power supply circuit; the second auxiliary power supply circuit includes a first input side, which is connected to the output terminal of the component control device. The power converter includes the DC terminal, a main power circuit, a first auxiliary power supply circuit, and an AC terminal. The input side of the main power circuit is connected to the DC terminal, and the output side of the main power circuit is connected to the AC terminal. The AC terminal is used to connect to an AC power network. The input side of the first auxiliary power supply circuit is connected to the AC terminal, and the first output side of the first auxiliary power supply circuit is connected to the DC terminal. The power converter is used to control the first output side of the first auxiliary power supply circuit to output a specified DC power in response to a start-up signal from at least one of the component control devices. The component control device is configured to perform a start-up action in response to the first input side of the second auxiliary power source circuit receiving the specified DC power and the input voltage of the first input side being greater than the minimum start-up voltage of the component control device.

12. A control method for a component control device, characterized in that, The input terminal of the component control device is used to connect to at least one DC power supply, and the output terminal of the component control device is connected in series with the output terminals of the remaining component control devices in the DC string and then connected to the DC terminal of the power converter; the component control device includes: a second auxiliary power supply circuit; the second auxiliary power supply circuit includes a first input side, the first input side being connected to the output terminal of the component control device; wherein, the power converter includes the DC terminal, a main power circuit, a first auxiliary power supply circuit, and an AC terminal, the input side of the main power circuit being connected to the DC terminal, the output side of the main power circuit being connected to the AC terminal, the AC terminal being used to connect to an AC power network, the input side of the first auxiliary power supply circuit being connected to the AC terminal, the first output side of the first auxiliary power supply circuit being connected to the DC terminal, and the power converter being used to control the first output side of the first auxiliary power supply circuit to output a specified DC power in response to a start-up signal of at least one of the component control devices; the method includes: Upon receiving the specified DC power at the first input side of the second auxiliary power source circuit, and when the input voltage at the first input side is greater than the minimum start-up voltage of the component control device, a start-up action is performed.

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