A soft start pre-charge control method, device, equipment and storage medium

Abstract

The application discloses a soft start pre-charging control method, device, equipment and storage medium. The method comprises the following steps: obtaining a floating capacitor voltage of a target floating capacitor in a target circuit; when the floating capacitor voltage is less than a pre-charging threshold, determining a maximum duty cycle of a target energization driving signal in a current pre-charging period according to electrical parameters of the target circuit; determining a target duty cycle based on a duty cycle selection rule and in combination with the maximum duty cycle; and triggering the target energization driving signal according to the target duty cycle in the current pre-charging period to realize soft start pre-charging of the target floating capacitor. The application solves the phenomenon that the existing FC-Boost circuit cannot charge the floating capacitor in a parallel scene, and problems such as overvoltage and overcurrent damage of a power circuit, and effectively controls pre-charging of the floating capacitor in the FC-Boost circuit without increasing the cost of a hardware circuit.

Description

Technical Field

[0001] This invention relates to the field of electrical design technology, and in particular to a soft-start pre-charge control method, device, equipment, and storage medium. Background Technology

[0002] With the development of photovoltaic converter technology, the application of FC-Boost three-level circuits has become increasingly mature and widespread. Figure 1a A circuit diagram of an FC-Boost circuit in the prior art is shown.

[0003] In the photovoltaic field, the parallel application of multiple boost circuits is very common. However, in parallel applications, if the circuit output is energized first and the output voltage is too low, the floating capacitor in the circuit may not be able to charge. If the photovoltaic module is started directly without control, it may cause problems such as overvoltage and overcurrent damage to the power circuit. Figure 1b A schematic diagram of the reverse charging principle of an FC-Boost circuit is shown, as follows: Figure 1b As shown, under the condition of an output voltage of 1500V, the clamping point potential is 750V. If the input voltage is greater than 750V, no current flows through the reverse charging circuit of the floating capacitor Cf, that is, the floating capacitor cannot be pre-charged. In extreme cases, the voltage of the floating capacitor is 0, which can easily cause circuit damage. Summary of the Invention

[0004] This invention provides a soft-start pre-charge control method, apparatus, device, and storage medium to effectively control the pre-charge of the floating capacitor in the FC-Boost circuit.

[0005] According to one aspect of the present invention, a soft-start pre-charge control method is provided, the method comprising:

[0006] Obtain the floating capacitor voltage of the target floating capacitor in the target circuit;

[0007] When the voltage of the floating capacitor is less than the pre-charge threshold, the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle is determined according to the electrical parameters of the target circuit.

[0008] Based on the duty cycle selection rules and the maximum duty cycle, the target duty cycle is determined.

[0009] During the current pre-charge cycle, the target power-on drive signal is triggered according to the target duty cycle to achieve soft-start pre-charge of the target floating capacitor.

[0010] Optionally, determining the maximum duty cycle of the target power-on drive signal within the current pre-charge cycle based on the electrical parameters of the target circuit includes:

[0011] Collect the electrical parameters of the target circuit at the current moment;

[0012] Based on the electrical parameters, determine the achievable duty cycle of the target power-on drive signal in the target circuit;

[0013] The achievable duty cycle is taken as the maximum duty cycle of the target power-on drive signal during the current pre-charge cycle.

[0014] Optionally, determining the target duty cycle based on the duty cycle selection rule and in conjunction with the maximum duty cycle includes:

[0015] Obtain the duty cycle selection ratio, and use the product of the maximum duty cycle and the duty cycle selection ratio as the target duty cycle.

[0016] Optionally, after obtaining the floating capacitor voltage of the target floating capacitor in the target circuit, the method further includes:

[0017] When the voltage of the floating capacitor is greater than or equal to the pre-charge threshold, the soft-start pre-charge operation of the target floating capacitor is stopped.

[0018] According to another aspect of the present invention, a soft-start pre-charge control device is provided, the device comprising:

[0019] The floating capacitor voltage acquisition module is used to acquire the floating capacitor voltage of the target floating capacitor in the target circuit.

[0020] The maximum duty cycle determination module is used to determine the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle based on the electrical parameters of the target circuit when the voltage of the floating capacitor is less than the pre-charge threshold.

[0021] The target duty cycle selection module is used to determine the target duty cycle based on the duty cycle selection rules and the maximum duty cycle.

[0022] The soft-start pre-charge trigger module is used to trigger the target power-on drive signal according to the target duty cycle during the current pre-charge cycle, so as to realize the soft-start pre-charge of the target floating capacitor.

[0023] Optionally, the maximum duty cycle determination module includes:

[0024] An electrical parameter acquisition unit is used to acquire the electrical parameters of the target circuit at the current moment when the voltage of the floating capacitor is less than the pre-charge threshold.

[0025] A duty cycle determination unit is provided for determining the achievable duty cycle of the target power-on drive signal in the target circuit based on the electrical parameters.

[0026] The maximum duty cycle determination unit is used to determine the achievable duty cycle as the maximum duty cycle of the target power-on drive signal during the current pre-charge cycle.

[0027] Optionally, the target duty cycle selection module is specifically used for:

[0028] Obtain the duty cycle selection ratio, and use the product of the maximum duty cycle and the duty cycle selection ratio as the target duty cycle.

[0029] Optionally, the device further includes:

[0030] The soft-start pre-charge stop module is used to stop the soft-start pre-charge operation of the target floating capacitor when the voltage of the floating capacitor is greater than or equal to the pre-charge threshold.

[0031] According to another aspect of the present invention, a soft-start pre-charge control device is provided, the device comprising:

[0032] At least one processor; and

[0033] A memory communicatively connected to the at least one processor; wherein,

[0034] The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the soft-start precharge control method according to any embodiment of the present invention.

[0035] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the soft-start precharge control method according to any embodiment of the present invention.

[0036] The technical solution of this invention involves obtaining the floating capacitor voltage of the target floating capacitor in the target circuit; when the floating capacitor voltage is less than the pre-charging threshold, determining the maximum duty cycle of the target power-on drive signal within the current pre-charging cycle based on the electrical parameters of the target circuit; determining the target duty cycle based on the duty cycle selection rule and the maximum duty cycle; and triggering the target power-on drive signal according to the target duty cycle within the current pre-charging cycle to achieve soft-start pre-charging of the target floating capacitor. This invention solves the problem of floating capacitors failing to charge in parallel scenarios in existing FC-Boost circuits, as well as problems such as overvoltage and overcurrent damage to the power circuit. Without increasing the cost of the hardware circuit, it effectively controls the pre-charging of the floating capacitor in the FC-Boost circuit.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1a A circuit diagram of an FC-Boost circuit in the prior art is shown;

[0040] Figure 1b A schematic diagram of the reverse charging principle of an FC-Boost circuit is shown;

[0041] Figure 2 This is a flowchart of a soft-start pre-charge control method provided in Embodiment 1 of the present invention;

[0042] Figure 3a This is a schematic diagram of the circuit current path under the first power-on drive signal in a soft-start pre-charge control method provided in Embodiment 1 of the present invention;

[0043] Figure 3b This is a schematic diagram of the circuit current path under the second power-on drive signal in a soft-start pre-charge control method provided in Embodiment 1 of the present invention;

[0044] Figure 3c This is a schematic diagram of the circuit current path under the third power-on drive signal in a soft-start pre-charge control method provided in Embodiment 1 of the present invention;

[0045] Figure 3d This is a schematic diagram of the circuit current path under the fourth power-on drive signal in a soft-start pre-charge control method provided in Embodiment 1 of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of a soft-start pre-charge control device according to Embodiment 2 of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of a soft-start pre-charge control device that implements the soft-start pre-charge control method of the present invention. Detailed Implementation

[0048] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first," "second," "target," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] Example 1

[0051] Figure 2 This is a flowchart of a soft-start pre-charge control method provided in Embodiment 1 of the present invention. This embodiment is applicable to the soft-start pre-charge of floating capacitors in FC-Boost circuits. This method can be executed by a soft-start pre-charge control device, which can be implemented in hardware and / or software and can be configured in photovoltaic modules. Figure 2 As shown, the method includes:

[0052] S110. Obtain the floating capacitor voltage of the target floating capacitor in the target circuit.

[0053] The soft-start pre-charge control method provided in this embodiment can be applied to scenarios where soft-start pre-charge is performed on the floating capacitor in the FC-Boost circuit of a photovoltaic module. In this scenario, the target circuit can be the FC-Boost circuit, and the target floating capacitor can be the floating capacitor Cf in the FC-Boost circuit.

[0054] In practical applications, the power-on drive signal can be periodically controlled to charge the target floating capacitor. During a pre-charging cycle, the floating capacitor voltage of the target floating capacitor in the target circuit can be obtained. When the floating capacitor voltage is less than the pre-charging threshold, it can be considered that the pre-charging of the target floating capacitor is not yet complete, and S120 can be continued.

[0055] S120. When the voltage of the floating capacitor is less than the pre-charge threshold, determine the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle based on the electrical parameters of the target circuit.

[0056] In this embodiment, the pre-charge threshold can be understood as the voltage of the floating capacitor when the floating capacitor completes pre-charging. That is, when the voltage of the target floating capacitor is less than the pre-charge threshold, it can be considered that the pre-charging of the target floating capacitor has not been completed. When the voltage of the target floating capacitor is greater than or equal to the pre-charge threshold, it can be considered that the pre-charging of the target floating capacitor has been completed.

[0057] When the voltage of the floating capacitor is less than the pre-charge threshold, it is necessary to continue charging the target floating capacitor. At this time, the maximum duty cycle of the current pre-charge cycle can be determined based on the components in the target circuit and the electrical parameters in the circuit.

[0058] Optionally, the maximum duty cycle of the target power-on drive signal within the current pre-charge cycle can be determined based on the electrical parameters of the target circuit. This can be achieved by: acquiring the electrical parameters of the target circuit at the current moment; determining the achievable duty cycle of the target power-on drive signal in the target circuit based on the electrical parameters; and using the achievable duty cycle as the maximum duty cycle of the target power-on drive signal within the current pre-charge cycle.

[0059] In this embodiment, the current time can be the start time of the current pre-charge cycle. By collecting the electrical parameters of the target circuit at the current time, the maximum achievable duty cycle of the target power-on drive signal within the current pre-charge cycle can be calculated.

[0060] For example, Figures 3a-3d This document provides schematic diagrams of the circuit current paths under four different power-on drive signals. In practical applications, the energizing states of T1 and T2 can be controlled to realize the switching states of the FC-Boost three-level circuit. The state where T1 is not energized and T2 is not energized can be referred to as the "00" switching state; the state where T1 is energized and T2 is not energized can be referred to as the "10" switching state; the state where T1 is not energized and T2 is energized can be referred to as the "01" switching state; and the state where T1 is energized and T2 is energized can be referred to as the "11" switching state. Figures 3a-3d In the diagram, the black dashed line can represent a current path. For example... Figure 3a As shown, when the FC-Boost circuit is in the "00" switching state, the current does not flow through the target floating capacitor Cf branch, and the target floating capacitor Cf cannot be pre-charged; Figure 3b As shown, when the FC-Boost circuit is in the "10" switching state, current flows through the target floating capacitor Cf branch, discharging the target floating capacitor Cf; as Figure 3cAs shown, when the FC-Boost circuit is in the "01" switching state, current flows through the target floating capacitor Cf branch, which can pre-charge the target floating capacitor Cf; as Figure 3d As shown, when the FC-Boost circuit is in the "11" switching state, the current does not flow through the target floating capacitor Cf branch, and the target floating capacitor Cf cannot be pre-charged. Therefore, the electrical signals that drive T1 to be de-energized and T2 to be energized can be determined as the target energizing drive signals.

[0061] Optionally, the soft-start pre-charge control method provided in this embodiment may further include the following steps after obtaining the floating capacitor voltage of the target floating capacitor in the target circuit: when the floating capacitor voltage is greater than or equal to the pre-charge threshold, stop the soft-start pre-charge operation of the target floating capacitor.

[0062] In practical applications, when the voltage of the floating capacitor is greater than or equal to the pre-charge threshold, it can be considered that the pre-charge of the target floating capacitor has been completed, and at this time the soft-start pre-charge operation of the target floating capacitor can be stopped.

[0063] S130. Based on the duty cycle selection rules and combined with the maximum duty cycle, determine the target duty cycle.

[0064] In this embodiment, in order to prevent problems such as overvoltage and overcurrent damage to the power circuit, the duty cycle can be appropriately reduced within a pre-charge cycle to achieve soft-start pre-charge of the target floating capacitor.

[0065] Optionally, S130 can be implemented in the following specific way: obtain the duty cycle selection ratio, and use the product of the maximum duty cycle and the duty cycle selection ratio as the target duty cycle.

[0066] In this embodiment, the duty cycle selection ratio can be preset, and the specific ratio can be adjusted according to the actual application scenario, such as setting it to 90%, 80%, etc. Within a pre-charge cycle, the target duty cycle of the target power-on drive signal can be obtained by multiplying the maximum duty cycle by the duty cycle selection ratio.

[0067] S140. During the current pre-charge cycle, trigger the target power-on drive signal according to the target duty cycle to achieve soft-start pre-charge of the target floating capacitor.

[0068] In this embodiment, when the target duty cycle of the target power-on drive signal is obtained within the current pre-charge cycle, the drive duration of the target power-on drive signal can be controlled according to the target duty cycle to precisely control the pre-charge operation of the target floating capacitor and realize the soft-start pre-charge of the target floating capacitor.

[0069] This invention, in its embodiment, obtains the floating capacitor voltage of the target floating capacitor in the target circuit; when the floating capacitor voltage is less than the pre-charging threshold, determines the maximum duty cycle of the target power-on drive signal within the current pre-charging cycle based on the electrical parameters of the target circuit; based on the duty cycle selection rules and combined with the maximum duty cycle, determines the target duty cycle; within the current pre-charging cycle, triggers the target power-on drive signal according to the target duty cycle to achieve soft-start pre-charging of the target floating capacitor. This invention solves the problem of floating capacitors failing to charge in parallel scenarios in existing FC-Boost circuits, as well as problems such as overvoltage and overcurrent damage to the power circuit. Without increasing hardware circuit costs, it effectively controls the pre-charging of the floating capacitor in the FC-Boost circuit.

[0070] Example 2

[0071] Figure 4 This is a schematic diagram of a soft-start pre-charge control device provided in Embodiment 2 of the present invention. Figure 4 As shown, the device includes:

[0072] The floating capacitor voltage acquisition module 210 is used to acquire the floating capacitor voltage of the target floating capacitor in the target circuit.

[0073] The maximum duty cycle determination module 220 is used to determine the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle based on the electrical parameters of the target circuit when the voltage of the floating capacitor is less than the pre-charge threshold.

[0074] The target duty cycle selection module 230 is used to determine the target duty cycle based on the duty cycle selection rules and the maximum duty cycle.

[0075] The soft-start pre-charge trigger module 240 is used to trigger the target power-on drive signal according to the target duty cycle during the current pre-charge cycle, so as to realize the soft-start pre-charge of the target floating capacitor.

[0076] Optionally, the maximum duty cycle determination module 220 includes:

[0077] An electrical parameter acquisition unit is used to acquire the electrical parameters of the target circuit at the current moment when the voltage of the floating capacitor is less than the pre-charge threshold.

[0078] A duty cycle determination unit is provided for determining the achievable duty cycle of the target power-on drive signal in the target circuit based on the electrical parameters.

[0079] The maximum duty cycle determination unit is used to determine the achievable duty cycle as the maximum duty cycle of the target power-on drive signal during the current pre-charge cycle.

[0080] Optionally, the target duty cycle selection module 230 is specifically used for:

[0081] Obtain the duty cycle selection ratio, and use the product of the maximum duty cycle and the duty cycle selection ratio as the target duty cycle.

[0082] Optionally, the device further includes:

[0083] The soft-start pre-charge stop module is used to stop the soft-start pre-charge operation of the target floating capacitor when the voltage of the floating capacitor is greater than or equal to the pre-charge threshold.

[0084] The soft-start pre-charge control device provided in the embodiments of the present invention can execute the soft-start pre-charge control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method.

[0085] Example 3

[0086] Figure 5 A schematic diagram of a soft-start precharge control device 10, which can be used to implement embodiments of the present invention, is shown. The soft-start precharge control device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The soft-start precharge control device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0087] like Figure 5 As shown, the soft-start precharge control device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes, such as the soft-start precharge control method described above, based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the soft-start precharge control device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0088] In some embodiments, the soft-start precharge control method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the soft-start precharge control device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the soft-start precharge control method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the soft-start precharge control method by any other suitable means (e.g., by means of firmware).

[0089] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0090] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A soft-start pre-charge control method, characterized in that, include: Obtain the floating capacitor voltage of the target floating capacitor in the target circuit; When the voltage of the floating capacitor is less than the pre-charge threshold, the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle is determined according to the electrical parameters of the target circuit. Based on the duty cycle selection rules and the maximum duty cycle, the target duty cycle is determined. During the current pre-charge cycle, the target power-on drive signal is triggered according to the target duty cycle to achieve soft-start pre-charge of the target floating capacitor; The step of determining the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle based on the electrical parameters of the target circuit includes: acquiring the electrical parameters of the target circuit at the current moment; determining the achievable duty cycle of the target power-on drive signal in the target circuit based on the electrical parameters; and using the achievable duty cycle as the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle. The step of determining the target duty cycle based on the duty cycle selection rule and the maximum duty cycle includes: obtaining the duty cycle selection ratio and using the product of the maximum duty cycle and the duty cycle selection ratio as the target duty cycle.

2. The method according to claim 1, characterized in that, After obtaining the floating capacitor voltage of the target floating capacitor in the target circuit, the following steps are also included: When the voltage of the floating capacitor is greater than or equal to the pre-charge threshold, the soft-start pre-charge operation of the target floating capacitor is stopped.

3. A soft-start pre-charge control device, characterized in that, include: The floating capacitor voltage acquisition module is used to acquire the floating capacitor voltage of the target floating capacitor in the target circuit. The maximum duty cycle determination module is used to determine the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle based on the electrical parameters of the target circuit when the voltage of the floating capacitor is less than the pre-charge threshold. The target duty cycle selection module is used to determine the target duty cycle based on the duty cycle selection rules and the maximum duty cycle. A soft-start pre-charge trigger module is used to trigger the target power-on drive signal according to the target duty cycle during the current pre-charge cycle, so as to realize the soft-start pre-charge of the target floating capacitor. The maximum duty cycle determination module includes: An electrical parameter acquisition unit is used to acquire the electrical parameters of the target circuit at the current moment when the voltage of the floating capacitor is less than the pre-charge threshold. A duty cycle determination unit is provided for determining the achievable duty cycle of the target power-on drive signal in the target circuit based on the electrical parameters. The maximum duty cycle determination unit is used to determine the achievable duty cycle as the maximum duty cycle of the target power-on drive signal in the current pre-charge cycle; The target duty cycle selection module is specifically used for: Obtain the duty cycle selection ratio, and use the product of the maximum duty cycle and the duty cycle selection ratio as the target duty cycle.

4. The apparatus according to claim 3, characterized in that, The device further includes: The soft-start pre-charge stop module is used to stop the soft-start pre-charge operation of the target floating capacitor when the voltage of the floating capacitor is greater than or equal to the pre-charge threshold.

5. A soft-start pre-charge control device, characterized in that, The device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the soft-start precharge control method according to any one of claims 1-2.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the soft-start precharge control method according to any one of claims 1-2.

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