Switching power supply control method and related device

Abstract

The invention provides a switching power supply control method and a related device, and relates to the field of power supply systems. In the application, the operation information of the inverter is obtained, when the operation information of the inverter meets the repeated starting control condition of the direct-current switching power supply, it is indicated that the current direct-current switching power supply is repeatedly started, at the moment, the direct-current switching power supply is turned off by using a reset signal, and the turn-off time of the direct-current switching power supply is the preset duration. Therefore, the next starting time of the direct-current switching power supply is after the preset duration after the direct-current switching power supply is turned off, the repeated starting frequency of the direct-current switching power supply is reduced, and then the power control unit can release residual charges in the time period when the direct-current switching power supply is turned off, so that the influence of the residual charges on the power control unit is avoided; and the operation reliability of the power control unit is improved.

Description

Technical Field

[0001] This application relates to the field of power supply systems, and more specifically, to a switching power supply control method and related apparatus. Background Technology

[0002] In a photovoltaic inverter power system, photovoltaic panels provide power to a DC (Direct Current) switching power supply. The DC switching power supply consumes power to convert high-voltage electricity into the control power required by the power control unit. If the power supplied by the photovoltaic panels to the DC switching power supply is weak, it will affect the reliability of the power control unit. Summary of the Invention

[0003] In view of this, this application provides a switching power supply control method and related apparatus to solve the problem that if the power supplied by the photovoltaic panel to the DC switching power supply is weak, it will affect the reliability of the power control unit operation.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0005] A switching power supply control method, comprising:

[0006] Obtain inverter operating information;

[0007] When the inverter operating information meets the repeated start-up control conditions of the DC switching power supply, the DC switching power supply is controlled to shut down using a reset signal, and the shutdown time of the DC switching power supply is a preset duration.

[0008] Optionally, obtain inverter operating information, including:

[0009] Obtain the characteristic values ​​of the control and conditioning chip located inside the inverter.

[0010] Optionally, the control conditioning chip includes a current sensor to acquire characteristic values ​​of the control conditioning chip located inside the inverter, including:

[0011] The sampled values ​​of the first current sensor and the second current sensor are obtained; the first current sensor is set on each series branch in the inverter, and the second current sensor is set on the bus branch in the inverter.

[0012] Optionally, the inverter operating information satisfies the repeated start-up control conditions of the DC switching power supply, including:

[0013] The difference between the summed current value and the sampled value of the second current sensor is greater than the difference threshold; the summed current value is the sum of the sampled values ​​of the first current sensor.

[0014] Optionally, obtain inverter operating information, including:

[0015] The number of times the communication connection between the power control unit and the communication unit set in the inverter has been established is obtained.

[0016] Optionally, the inverter operating information satisfies the repeated start-up control conditions of the DC switching power supply, including:

[0017] The number of times the communication connection was established exceeded the threshold.

[0018] Optionally, the DC switching power supply is controlled to shut down using a reset signal, and the shutdown time of the DC switching power supply is a preset duration, including:

[0019] A power-off signal is sent to the communication unit, so that the communication unit can send a reset signal to the DC switching power supply directly or through a reset circuit to turn off the DC switching power supply. At the same time, the communication unit starts a timer until the timer reaches a preset duration, at which point it sends a reset cancellation signal to the DC switching power supply to turn on the DC switching power supply.

[0020] A switching power supply control device, comprising:

[0021] The information acquisition module is used to acquire inverter operating information;

[0022] The power control module is used to control the DC switching power supply to shut down using a reset signal when the inverter operation information meets the repeated start-up control conditions of the DC switching power supply, and the shutdown time of the DC switching power supply is a preset duration.

[0023] A controller for executing the above-described switching power supply control method.

[0024] An inverter includes a DC switching power supply and the aforementioned controller.

[0025] Optionally, the DC switching power supply is further used for:

[0026] After receiving the reset cancellation signal from the communication unit, if the power supply voltage output by the photovoltaic panel is greater than the voltage threshold, the power-on operation is performed.

[0027] Optionally, the inverter further includes a communication unit and a reset circuit; the communication unit is communicatively connected to the DC switching power supply through the reset circuit.

[0028] The communication unit is used to respond to the power-off signal sent by the controller, send a reset signal to the DC switching power supply using a reset circuit to turn off the DC switching power supply, and start a timer until the timer reaches a preset duration, when a reset cancellation signal is sent to the DC switching power supply to turn on the DC switching power supply.

[0029] Optionally, the inverter further includes:

[0030] AC switching power supply;

[0031] The AC switching power supply is connected to the communication unit.

[0032] This application provides a switching power supply control method and related apparatus. In this application, inverter operating information is obtained. If the inverter operating information meets the repeated start-up control conditions of the DC switching power supply, it indicates that the power supplied by the photovoltaic panel to the DC switching power supply is weak, and the DC switching power supply is repeatedly starting. At this time, a reset signal is used to shut down the DC switching power supply, and the shutdown time of the DC switching power supply is a preset duration. This ensures that the next startup time of the DC switching power supply is after the preset duration after the current shutdown, thereby reducing the repeated startup frequency of the DC switching power supply. Furthermore, during the shutdown period of the DC switching power supply, the power control unit can release residual charge, avoiding the influence of residual charge on the power control unit, and thus improving the operational reliability of the power control unit. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1 A schematic diagram of an inverter structure provided for related technologies;

[0035] Figure 2 A schematic flowchart illustrating a switching power supply control method provided in an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of an inverter provided in an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of another inverter provided in an embodiment of this application;

[0038] Figure 5 This is a schematic diagram of a switching power supply control device provided in an embodiment of this application. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] like Figure 1 As shown, the photovoltaic inverter power system includes components such as a power control unit, a DC switching power supply (also known as a DC power supply), an AC switching power supply (also known as an AC (Alternating Current) power supply), an external communication unit, and an energy conversion unit. The DC and AC switching power supplies together constitute the photovoltaic inverter's power system.

[0041] The DC switching power supply and energy conversion unit are powered by photovoltaic panels. The DC switching power supply outputs control power (the voltage of which is the first power supply voltage, such as 5V, 12V, or 24V) to power the power control unit. The AC switching power supply is powered by energy from the grid and outputs a second power supply voltage to power the external communication unit.

[0042] The power control unit is able to establish a communication link with an external communication unit.

[0043] The energy conversion unit mainly converts DC energy into AC energy and transmits it to the power grid.

[0044] The external communication unit mainly enables the inverter to communicate with external systems. Communication methods can include RS485 communication, PLC (Programmable Logic Controller) communication, Bluetooth, etc. The external communication unit can establish a communication link with the power control unit.

[0045] The DC switching power supply consumes energy when converting the high-voltage electricity provided by the photovoltaic panel into control electricity. In the early morning light, the power provided by the photovoltaic panel is weak and cannot sustain the output control power of the DC switching power supply. Taking a control power of 5V as an example, it cannot support the establishment of a 5V power system at this time. As the irradiance increases and the energy of the solar panel increases, the DC switching power supply will repeatedly start up, resulting in intermittent power supply startup.

[0046] Intermittent power supply startup can generate residual charge. Specifically, after a DC switching power supply is turned off, the control circuit begins to lose power. If the control circuit is not completely de-energized to 0V before the switching power supply is turned on, residual charge will be generated on the control circuit. This residual charge may cause the control conditioning chip in the power control unit to enter an abnormal working state, thereby affecting the reliability of the power control unit.

[0047] For example, a power control unit may contain a control conditioning chip, such as a current sensor or a fan controller. Taking a current sensor as an example, the current sensor has strict requirements regarding the timing of the power supply, such as strict requirements regarding residual charge. The aforementioned intermittent power supply startup phenomenon will result in residual charge in the control circuit. This residual charge will flow into the current sensor, causing it to retain residual charge internally and preventing its internal state from being cleared. This may cause the current sensor to enter an abnormal operating state, resulting in incorrect current values ​​detected. It should be noted that this is not limited to the current sensor in the power control unit; other control conditioning chips or integrated circuit (IC) active devices in the power control unit may also malfunction due to residual charge in the power supply, affecting the reliability of the power control unit.

[0048] To address this, this application provides a switching power supply control method and related apparatus. In this application, inverter operating information is obtained. If the inverter operating information meets the repeated start-up control conditions of the DC switching power supply, it indicates that the power supplied by the photovoltaic panel to the DC switching power supply is weak, and the DC switching power supply is repeatedly starting. At this time, a reset signal is used to shut down the DC switching power supply, and the shutdown time is a preset duration. This ensures that the next startup time of the DC switching power supply is after the preset duration following the current shutdown, reducing the frequency of repeated startups. Furthermore, during the shutdown period, the power control unit is not operating, allowing residual charge to be released and preventing its impact on the power control unit, thereby improving the operational reliability of the power control unit.

[0049] Based on the above, this application provides a switching power supply control method, wherein the executing entity can be the controller in an inverter. The inverter can be a photovoltaic inverter, etc. The controller in the inverter can be the aforementioned power control unit.

[0050] Reference Figure 2 A switching power supply control method may include:

[0051] S11. Obtain inverter operating information.

[0052] Inverter operation information refers to data related to inverter operation, such as characteristic values ​​of internal inverter devices. It can also include communication information between devices, such as the number of communications and the duration of communication connections. The specific information collected as inverter operation information is configurable by those skilled in the art.

[0053] S12. When the inverter operation information meets the repeated start-up control conditions of the DC switching power supply, the DC switching power supply is controlled to shut down using a reset signal, and the shutdown time of the DC switching power supply is a preset duration.

[0054] In practical implementation, the repeated start-up control conditions for a DC switching power supply can be configured according to actual conditions. These conditions refer to the limiting conditions that characterize the DC switching power supply, i.e., the repeated start-up of the aforementioned DC switching power supply. These repeated start-up control conditions can include, for example, limiting the range of characteristic values ​​of the device or restricting the number of communication attempts.

[0055] If the inverter operating information meets the repeated start control conditions of the DC switching power supply, it indicates that the DC switching power supply, i.e. the DC switching power supply mentioned above, is repeatedly starting.

[0056] When the inverter operating information meets the repeated start-up control conditions of the DC switching power supply, the DC switching power supply can be turned off using a reset signal, and the shutdown time of the DC switching power supply is a preset duration.

[0057] In one implementation, a communication link can be established between the DC switching power supply and the power control unit. The power control unit directly uses this communication link to send a shutdown command to the DC switching power supply, causing the DC switching power supply to shut down. The shutdown of the DC switching power supply can be achieved by using the power supply's startup signal as a shutdown signal, such as a low-level signal.

[0058] In this method, after the DC switching power supply is turned off, the DC switching power supply no longer outputs control power to the power control unit, the power control unit stops operating, and it cannot send an on signal to the DC switching power supply again. At this time, the DC switching power supply can be started by manually inputting a start signal.

[0059] The above method involves the power control unit directly controlling the DC switching power supply to shut down. In another implementation, the power control unit can also indirectly control the DC switching power supply to shut down. For example, it can utilize an internal communication unit within the inverter, or an external communication unit, to control the DC switching power supply to shut down using a reset signal.

[0060] Regardless of which method is used to control the DC switching power supply to shut down, the shutdown time of the DC switching power supply must be a preset duration.

[0061] The preset duration can be configured according to actual conditions, such as a few minutes. In one implementation, the DC power supply typically experiences repeated startups during the low-light hours of the morning. Therefore, after the DC power supply repeatedly starts and shuts down, the duration of the low-light period can be analyzed. This duration can be used as the preset duration, allowing the DC power supply to be shut down for the preset duration during low-light hours, thus avoiding repeated startups during this period. During the shutdown period, the power control unit can release residual charges internally, preventing these charges from affecting the control and conditioning chip within the power control unit and ensuring its normal operation.

[0062] As the illumination increases, the DC switching power supply starts up. Taking a control voltage of 5V as an example, if the DC switching power supply can establish a 5V control voltage in one go, it can stably provide a 5V control voltage to the power control unit, and the DC switching power supply will no longer repeatedly start up. Furthermore, after the illumination increases, the power-on slope of the DC switching power supply is larger, thus meeting the power-on slope requirements of the control and conditioning chip in the power control unit.

[0063] In another implementation of this application, the number of times the DC switching power supply is started can also be detected, or the number of times the DC switching power supply is started can be directly collected to determine whether the number of times the DC switching power supply is started is excessive. If the number of starts exceeds a set threshold, it is considered that the DC switching power supply is repeatedly started, i.e., intermittently started. In this case, a reset signal is used to control the DC switching power supply to shut down, and the shutdown time of the DC switching power supply is a preset duration. The specific control process is described in the corresponding description above.

[0064] In this embodiment, inverter operating information is obtained. If the inverter operating information meets the repeated start-up control conditions of the DC switching power supply, it indicates that the power supplied by the photovoltaic panel to the DC switching power supply is weak, and the DC switching power supply is repeatedly starting up. At this time, the DC switching power supply is turned off using a reset signal, and the shutdown time of the DC switching power supply is a preset duration. This ensures that the next startup time of the DC switching power supply is after the preset duration after the current shutdown, reducing the repeated startup frequency of the DC switching power supply. Furthermore, during the shutdown period of the DC switching power supply, the power control unit can release residual charge, avoiding the influence of residual charge on the power control unit, thereby improving the operational reliability of the power control unit.

[0065] In another implementation of this application, there are multiple ways to obtain inverter operating information and ensure that the inverter operating information meets the repeated start-up control conditions of the DC switching power supply, which will be described in detail below.

[0066] 1. First implementation method:

[0067] Obtain the characteristic values ​​of the control and conditioning chip located inside the inverter.

[0068] The control and conditioning chip can be, for example, a current sensor or a fan controller. When the control and conditioning chip is a current sensor, the characteristic value can be the sampled value of the current sensor; when the control and conditioning chip is a fan controller, the characteristic value can be the fan speed value detected by the fan controller.

[0069] In one implementation, the control conditioning chip includes a current sensor, and acquiring the characteristic values ​​of the control conditioning chip located inside the inverter includes:

[0070] The sampled values ​​of the first current sensor and the second current sensor are obtained; the first current sensor is set on each series branch in the inverter, and the second current sensor is set on the bus branch in the inverter.

[0071] The merging branch is the branch obtained by merging the string branches.

[0072] In real-world scenarios, photovoltaic (PV) panels typically contain multiple PV strings, referred to as PV1 (Photovoltaic), PV2, PV3, etc. These PV strings are connected in parallel to an inverter. Each string branch in the inverter is equipped with a current sensor, called the first current sensor. The first current sensor detects the current value output by each string, and its sampled value represents the current value on the string branch.

[0073] In addition, multiple string branches have a busbar at their output terminals, which is used to aggregate the current of each string branch. A current sensor, called a second current sensor, is also installed on the busbar. This second current sensor detects the current value on the busbar, and its sampled value is the current value on the busbar.

[0074] Under normal circumstances, the sum of the current values ​​in each string branch should equal the current value in the bus branch. However, in scenarios where the DC switching power supply is repeatedly started, residual charge may exist, causing the current sensor to operate abnormally. This can lead to errors in the current value detected by the current sensor, resulting in the sum of the current values ​​in each string branch not equaling the current value in the bus branch. Therefore, analyzing whether the sum of the current values ​​in each string branch equals the current value in the bus branch can determine if the current sensor is malfunctioning. If it is malfunctioning, it may be due to repeated starts of the DC switching power supply.

[0075] If the sum of the current values ​​in each string branch is not equal to the current value in the bus branch, it can be inferred that the current sensor is malfunctioning, and consequently, the DC switching power supply is repeatedly starting up. If the sum of the current values ​​in each string branch is equal to the current value in the bus branch, it can be inferred that the current sensor is not malfunctioning, and in this case, the DC switching power supply is not reset.

[0076] Therefore, based on this embodiment, the inverter operating information satisfies the repeated start-up control conditions of the DC switching power supply, including:

[0077] The difference between the summed current value and the sampled value of the second current sensor is greater than the difference threshold; the summed current value is the sum of the sampled values ​​of the first current sensor.

[0078] For example, in a string-two-to-one MPPT (Maximum Power Point Tracking) system, the currents on PV1 and PV2 converge to form the current on MPPT1. Theoretically, I PV1 +I PV2 =I MPPT1 Among them, I PV1 It refers to the current I on PV1. PV2 It refers to the current I on PV2. MPPT1 This refers to the current on MPPT1. PV1和 I PV2 This is the sampled value of the first current sensor in this embodiment, I. PV1 +I PV2 This is the sum of current values ​​in this embodiment, I. MPPT1 This is the sampled value of the second current sensor in this embodiment.

[0079] In scenarios involving repeated startups of a DC switching power supply, residual charge can cause the current sensor to operate abnormally. When the current sensor on the PV / MPPT enters an abnormal state, the current sampling value will exhibit an abnormal deviation. The deviation between the sum of the string currents (i.e., the aggregated current value) and the MPPT current exceeds a threshold difference, allowing the power control unit to determine that the current sensor is malfunctioning. For example, assuming that the string current sensor of PV1 malfunctions, then I... PV1 +I PV2 ≠I MPPT1 This indicates that the current sensor is malfunctioning, and it can be inferred that the DC switching power supply is repeatedly starting up, causing the current sensor and other control and conditioning chips to malfunction due to the repeated starting of the DC switching power supply.

[0080] In this embodiment, the difference threshold can be configured according to actual conditions to avoid false triggering. It is a deviation range set in conjunction with the sampling error. It can be a fixed value or a variable value.

[0081] 2. The second implementation method:

[0082] The number of times the communication connection between the power control unit and the communication unit set in the inverter has been established is obtained.

[0083] In real-world scenarios, during the early morning when the light is weak, the photovoltaic panels have low energy. When the DC switching power supply starts intermittently, the initial power supply voltage cannot be stabilized. Repeated power-on and power-off cycles will cause the power control unit and communication unit, such as the external communication unit, to establish multiple connections in a short period of time. If the number of communication connection establishments exceeds the frequency limit, the power control unit can determine that the intermittent startup of the DC switching power supply is caused by insufficient energy from the photovoltaic panels.

[0084] Therefore, in this embodiment, the power control unit can count the number of times the communication connection between the power control unit and the communication unit is established.

[0085] In the statistical analysis, the number of communication connections established between the power control unit and the communication unit after the DC switching power supply is first started can be counted to determine whether the number of communication connections exceeds the limit. Alternatively, the number of communication connections established between the power control unit and the communication unit within a recent period can be counted to determine whether the two are establishing connections multiple times in a short period of time.

[0086] Based on this embodiment, in one implementation, the inverter operating information satisfies the repeated start-up control conditions of the DC switching power supply, including:

[0087] The number of times the communication connection was established exceeded the threshold.

[0088] Specifically, if the number of times the communication connection between the power control unit and the communication unit is established exceeds the threshold, the power control unit can determine that the DC switching power supply is intermittently started due to insufficient energy of the photovoltaic panel, which causes the power control unit and the communication unit to repeatedly establish a connection.

[0089] This embodiment provides two implementation methods to determine whether the DC switching power supply is repeatedly started, so that corresponding control can be performed during repeated starts to reduce the problem of residual current generated due to repeated power supply starts, which in turn affects the operational reliability of the control and conditioning chip inside the power control unit.

[0090] When the inverter operating information is determined to meet the repeated start-up control conditions of the DC switching power supply through the above embodiments, it is considered that the DC switching power supply is repeatedly started. At this time, the DC switching power supply can be controlled to shut down using a reset signal, and the shutdown time of the DC switching power supply is a preset duration.

[0091] In one implementation, when the DC switching power supply is controlled to shut down using a reset signal and the shutdown time of the DC switching power supply is a preset duration, the control of the DC switching power supply can be indirectly achieved through a communication unit.

[0092] When indirectly controlling a DC switching power supply using a communication unit, Figure 1 Based on this, a communication line between the external communication unit and the DC switching power supply was added (specifically as follows). Figure 3 (As shown by the dashed line in the diagram), the external communication unit can communicate with the DC switching power supply using this communication line. In one implementation, the external communication unit can directly communicate with the DC switching power supply using this communication line. In this case, the external communication unit sends a reset signal to the DC switching power supply to shut down the DC switching power supply. In another implementation, as shown... Figure 4 As shown, a reset circuit can be provided between the external communication unit and the DC switching power supply. The communication unit uses the reset circuit to send a reset signal to the DC switching power supply to shut down the DC switching power supply.

[0093] In practical scenarios, when the power control unit determines that the difference between the summed current value and the sampled value from the second current sensor exceeds a threshold, it considers the current sensor to be malfunctioning due to repeated startups of the DC power supply. Other control and conditioning chips, such as the fan controller, handle this with the same logic. Furthermore, if the number of communication connection establishments between the power control unit and the communication unit exceeds a threshold, it can also be determined that the DC power supply is repeatedly starting up, which will subsequently affect the operational reliability of the control and conditioning chips within the power control unit. To avoid this problem, the power control unit sends a power-off signal to the communication unit, such as... Figure 3 Alternatively, the external communication unit in step 4, upon receiving the power-off signal, can directly send a reset signal to the DC switching power supply, or use a reset circuit to send a reset signal to the DC switching power supply. Upon receiving the reset signal, the DC switching power supply will shut down. For example, if the start signal of the DC switching power supply is set to a shutdown signal, the DC switching power supply will be shut down. After the DC switching power supply is shut down, residual charge will be released inside the power control unit, causing the first power supply voltage to fall below the voltage limit, indicating that the residual charge release is complete.

[0094] Simultaneously with the issuance of the reset signal, the external communication unit begins timing. When the timer reaches a preset duration, a reset cancellation signal is sent to the DC switching power supply. Upon receiving this reset cancellation signal, the DC switching power supply's start signal can be set to an on signal, allowing it to be turned on subsequently. In this embodiment, the preset duration ensures that residual charge is completely released (i.e., the internal charge of the DC switching power supply is completely reduced to zero) and the first power supply voltage is below the voltage limit.

[0095] In one implementation, after the DC switching power supply can be turned on, in order to avoid repeated turning on of the DC switching power supply, the DC switching power supply can be configured to have the function of detecting the power supply voltage output by the photovoltaic panel. After the DC switching power supply detects the power supply voltage output by the photovoltaic panel, if the power supply voltage output by the photovoltaic panel is greater than the voltage threshold (the voltage value that can support a 5V or other voltage power system to be established at one time), the power-on operation is performed to establish a 5V or other voltage power system at one time, so as to ensure that the power control unit can enter normal operation according to the normal power-on sequence.

[0096] To enable those skilled in the art to better understand the specific implementation of this application, the control logic of this application is illustrated with examples.

[0097] In some embodiments, the power control unit resets and restarts the DC switching power supply after detecting an abnormality in the control conditioning chip. Taking a DC-side current sensor as an example, the specific implementation logic is as follows:

[0098] If the PV / MPPT current sensor operates in an abnormal state, the current sampling value will deviate abnormally. If the deviation between the sum of the string currents and the MPPT current exceeds the limit, the power control unit can determine that the sensor is abnormal.

[0099] For example, in a 2-to-1 MPPT system, PV1 and PV2 merge to form MPPT1, theoretically I PV1 +I PV2 =I MPPT1 Assuming that when the string current sensor of PV1 malfunctions, then I PV1 +I PV2 ≠I MPPT1 After the power control unit detects the anomaly, it uploads the first control signal to the external communication unit.

[0100] After receiving the first control signal, the external communication unit sends a second control signal to the DC switching power supply to shut down the DC switching power supply.

[0101] At the same time, the external communication unit starts timing, so that after the second control signal is maintained for a period of time, when the first power supply voltage is lower than the limit, the external communication unit sends a third control signal to turn on the DC switching power supply.

[0102] In this embodiment, for other control and conditioning chips, such as fan controllers, that are abnormal due to repeated startups of the DC switching power supply, in addition to the current sensor, power reset can also be performed through corresponding logic judgments.

[0103] In other embodiments, the power control unit detects that the number of communication connection establishments between the power control unit and the communication unit exceeds a threshold, thus assuming that the DC switching power supply is repeatedly starting up, and resets and restarts the DC switching power supply. The specific scheme is as follows:

[0104] In low light conditions, the photovoltaic panels have weak energy. When the DC power supply enters intermittent startup, the initial power supply voltage cannot be stabilized. Repeated power-on and power-off cycles cause the communication link between the power control unit and the external communication unit to establish connections multiple times in a short period, exceeding the communication establishment frequency limit. The power control unit can then determine that the intermittent startup of the DC power supply is due to insufficient energy from the photovoltaic panels. The power control unit uploads a first control signal to the external communication unit, which then sends a second control signal to shut down the DC power supply. Simultaneously, the external communication unit starts a timer. After the second control signal is maintained for a period of time, ensuring that the initial power supply voltage is below the limit, the external communication unit sends a third control signal to turn the DC power supply back on.

[0105] In some other embodiments, instead of relying on the first control signal described above, the external communication unit resets and restarts the DC switching power supply when it detects repeated startups. Specific solutions are as follows:

[0106] In low light conditions, the photovoltaic panels have weak energy. When the DC power supply enters intermittent startup, the initial power supply voltage cannot be stabilized. Repeated power-on and power-off cycles cause the communication link between the power control unit and the external communication unit to establish connections multiple times in a short period of time. If this exceeds the frequency limit for communication establishment, the external communication unit can determine that the intermittent startup of the DC power supply is caused by insufficient energy from the photovoltaic panels. The external communication unit then sends a second control signal to shut down the DC power supply. Simultaneously, the external communication unit starts a timer. After the second control signal is maintained for a period of time, ensuring that the initial power supply voltage is below the limit, the external communication unit sends a third control signal to turn the DC power supply back on.

[0107] In this implementation, when the power system or communication link is abnormally sampled by the identification control conditioning chip, the power system is reset and restarted to ensure that the power system is established normally.

[0108] In addition, this application can utilize the existing control and communication units of the photovoltaic inverter, only adding a reset unit circuit, which will not significantly increase the cost of the system and is relatively easy to implement.

[0109] Based on the embodiments of the above-described switching power supply control method, another embodiment of this application provides a switching power supply control device, referring to... Figure 5 It can include:

[0110] Information acquisition module 11 is used to acquire inverter operating information;

[0111] The power control module 12 is used to control the DC switching power supply to shut down using a reset signal when the inverter operation information meets the repeated start-up control conditions of the DC switching power supply, and the shutdown time of the DC switching power supply is a preset duration.

[0112] In one implementation, the information acquisition module 11 includes:

[0113] The first acquisition submodule is used to acquire the characteristic values ​​of the control and conditioning chip set inside the inverter.

[0114] In one implementation, the control conditioning chip includes a current sensor, and the first acquisition submodule is specifically used for:

[0115] The sampled values ​​of the first current sensor and the second current sensor are obtained; the first current sensor is set on each series branch in the inverter, and the second current sensor is set on the bus branch in the inverter.

[0116] In one implementation, the inverter operating information satisfies the repeated start-up control conditions of the DC switching power supply, including:

[0117] The difference between the summed current value and the sampled value of the second current sensor is greater than the difference threshold; the summed current value is the sum of the sampled values ​​of the first current sensor.

[0118] In one implementation, the information acquisition module 11 includes:

[0119] The second acquisition submodule is used to acquire the number of times the communication connection between the power control unit and the communication unit set in the inverter has been established.

[0120] In one implementation, the inverter operating information satisfies the repeated start-up control conditions of the DC switching power supply, including:

[0121] The number of times the communication connection was established exceeded the threshold.

[0122] In one implementation, the power control module 12 is specifically used for:

[0123] A power-off signal is sent to the communication unit, so that the communication unit can send a reset signal to the DC switching power supply directly or through a reset circuit to turn off the DC switching power supply. At the same time, the communication unit starts a timer until the timer reaches a preset duration, at which point it sends a reset cancellation signal to the DC switching power supply to turn on the DC switching power supply.

[0124] In this embodiment, inverter operating information is obtained. If the inverter operating information meets the repeated start-up control conditions of the DC switching power supply, it indicates that the power supplied by the photovoltaic panel to the DC switching power supply is weak, and the DC switching power supply is repeatedly starting up. At this time, the DC switching power supply is turned off using a reset signal, and the shutdown time of the DC switching power supply is a preset duration. This ensures that the next startup time of the DC switching power supply is after the preset duration after the current shutdown, reducing the repeated startup frequency of the DC switching power supply. Furthermore, during the shutdown period of the DC switching power supply, the power control unit can release residual charge, avoiding the influence of residual charge on the power control unit, thereby improving the operational reliability of the power control unit.

[0125] It should be noted that the working process of each module and sub-module in this embodiment is described in the corresponding descriptions in the above embodiments, and will not be repeated here.

[0126] Based on the embodiments of the above-described switching power supply control method and apparatus, another embodiment of this application provides a controller that can be used for... Figure 3 and Figure 4 The power control unit in the power supply is used to execute the switching power supply control method described above.

[0127] Based on the above-described controller embodiments, another embodiment of this application provides an inverter, including a DC switching power supply and the aforementioned controller, with the specific structure as follows: Figure 3 and Figure 4 As shown.

[0128] In one implementation, the DC switching power supply is further used for:

[0129] After receiving the reset cancellation signal from the communication unit, if the power supply voltage output by the photovoltaic panel is greater than the voltage threshold, the power-on operation is performed.

[0130] In practical applications, after receiving the reset cancellation signal sent by the communication unit, the DC switching power supply can attempt to start when the photovoltaic panel provides high voltage. However, the problem of repeated startups of the DC switching power supply due to insufficient power provided by the photovoltaic panel still exists. Therefore, in this embodiment, an improvement has been made on the DC switching power supply side. After receiving the reset cancellation signal sent by the communication unit, the DC switching power supply will detect the power supply voltage output by the photovoltaic panel. If it is greater than the voltage threshold, it means that the power supply voltage output by the photovoltaic panel is large enough to enable the DC switching power supply to establish a 5V or other voltage power system at one time. Only then will the DC switching power supply start normally.

[0131] If the power supply voltage output by the photovoltaic panel is less than the voltage threshold, it means that the power provided by the photovoltaic panel is insufficient to enable the DC switching power supply to establish a 5V or other voltage power system at one time. In this case, the DC switching power supply cannot start, but continues to detect the power supply voltage output by the photovoltaic panel until the light intensity increases and the power supply voltage output by the photovoltaic panel increases to meet the voltage threshold requirement. Only then will the start-up operation be performed to reduce the impact of residual charge generated by repeated startup of the DC switching power supply on the subsequent control and conditioning chip.

[0132] In one implementation, the inverter further includes a communication unit and a reset circuit; the communication unit is communicatively connected to the DC switching power supply through the reset circuit.

[0133] The communication unit is used to respond to the power-off signal sent by the controller, send a reset signal to the DC switching power supply using a reset circuit to turn off the DC switching power supply, and start a timer until the timer reaches a preset duration, when a reset cancellation signal is sent to the DC switching power supply to turn on the DC switching power supply.

[0134] The specific implementation in this embodiment refers to the corresponding description above and... Figure 4 .

[0135] In one implementation, the inverter further includes:

[0136] AC switching power supply, namely the AC switching power supply mentioned above.

[0137] The AC switching power supply is connected to the communication unit, such as an external communication unit, for communicating with the external communication unit to transmit relevant information of the inverter.

[0138] In this embodiment, by establishing a communication link between the external communication unit in the inverter and the DC switching power supply, the external communication unit can control the DC switching power supply. This enables the external communication unit to send reset signals and reset cancellation signals to the DC switching power supply, thereby resetting the DC switching power supply. During the reset process, the power control unit releases residual charge, preventing residual charge from affecting the control conditioning chip and ensuring the reliable operation of the power control unit.

[0139] This application also provides a computer program product including computer-readable instructions, which, when executed on an electronic device, cause the electronic device to implement any of the switching power supply control methods provided in this application.

[0140] This application also provides a computer-readable storage medium that carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the switching power supply control methods provided in this application.

[0141] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A switching power supply control method, characterized in that, include: Obtain inverter operating information; When the inverter operating information meets the repeated start-up control conditions of the DC switching power supply, the DC switching power supply is controlled to shut down using a reset signal, and the shutdown time of the DC switching power supply is a preset duration.

2. The switching power supply control method according to claim 1, characterized in that, Obtain inverter operating information, including: Obtain the characteristic values ​​of the control and conditioning chip located inside the inverter.

3. The switching power supply control method according to claim 2, characterized in that, The control conditioning chip includes a current sensor to acquire characteristic values ​​of the control conditioning chip located inside the inverter, including: The sampled values ​​of the first current sensor and the second current sensor are obtained; the first current sensor is set on each series branch in the inverter, and the second current sensor is set on the bus branch in the inverter.

4. The switching power supply control method according to claim 3, characterized in that, The inverter operating information satisfies the repeated start-up control conditions of the DC switching power supply, including: The difference between the summed current value and the sampled value of the second current sensor is greater than the difference threshold; the summed current value is the sum of the sampled values ​​of the first current sensor.

5. The switching power supply control method according to claim 1, characterized in that, Obtain inverter operating information, including: The number of times the communication connection between the power control unit and the communication unit set in the inverter has been established is obtained.

6. The switching power supply control method according to claim 5, characterized in that, The inverter operating information satisfies the repeated start-up control conditions of the DC switching power supply, including: The number of times the communication connection was established exceeded the threshold.

7. The switching power supply control method according to any one of claims 1-5, characterized in that, The DC switching power supply is controlled to shut down using a reset signal, and the shutdown time of the DC switching power supply is a preset duration, including: A power-off signal is sent to the communication unit, so that the communication unit can send a reset signal to the DC switching power supply directly or through a reset circuit to turn off the DC switching power supply. At the same time, the communication unit starts a timer until the timer reaches a preset duration, at which point it sends a reset cancellation signal to the DC switching power supply to turn on the DC switching power supply.

8. A switching power supply control device, characterized in that, include: The information acquisition module is used to acquire inverter operating information; The power control module is used to control the DC switching power supply to shut down using a reset signal when the inverter operation information meets the repeated start-up control conditions of the DC switching power supply, and the shutdown time of the DC switching power supply is a preset duration.

9. A controller, characterized in that, Used to perform the switching power supply control method as described in any one of claims 1 to 7.

10. An inverter, characterized in that, This includes a DC switching power supply and the controller as described in claim 9.

11. The inverter according to claim 10, characterized in that, The DC switching power supply is also used for: After receiving the reset cancellation signal from the communication unit, if the power supply voltage output by the photovoltaic panel is greater than the voltage threshold, the power-on operation is performed.

12. The inverter according to claim 10 or 11, characterized in that, The inverter also includes a communication unit and a reset circuit; the communication unit is communicatively connected to the DC switching power supply through the reset circuit. The communication unit is used to respond to the power-off signal sent by the controller, send a reset signal to the DC switching power supply using a reset circuit to turn off the DC switching power supply, and start a timer until the timer reaches a preset duration, when a reset cancellation signal is sent to the DC switching power supply to turn on the DC switching power supply.

13. The inverter according to claim 12, characterized in that, The inverter also includes: AC switching power supply; The AC switching power supply is connected to the communication unit.

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