Control method of power converter, power converter and control device

Abstract

The invention provides a control method of a power converter, the power converter and a control device. The method comprises the following steps: under the condition that a temperature detection value of the power converter is greater than or equal to a first temperature threshold value, reducing the output power of the power converter according to a first derating step length corresponding to the first temperature threshold value; after a first preset duration, obtaining a temperature detection value of the power converter: when the obtained temperature detection value is greater than or equal to a second temperature threshold, reducing the output power of the power converter according to a second derating step length corresponding to the second temperature threshold; the second temperature threshold is greater than the first temperature threshold, and the second derating step length is greater than or equal to the first derating step length; under the condition that the obtained temperature detection value is smaller than a preset upper limit safety threshold value, normal output power of the power converter is recovered; the upper limit safety threshold is smaller than or equal to the first temperature threshold. According to the scheme, the internal temperature of the functional converter can be quickly adjusted, and the over-temperature risk of internal devices is reduced.

Description

Technical Field

[0001] This application relates to the field of power conversion technology, specifically to a control method for a power converter, a power converter, and a control device. Background Technology

[0002] Power converters have wide applications in the field of power conversion. During actual operation, power converters generate a lot of heat. When they operate in high-temperature environments for extended periods, the internal components of the power converter are prone to performance degradation due to excessive temperature, and may even be damaged by overheating, thus affecting the stable operation of the power converter.

[0003] However, in related technologies, power converters have difficulty in quickly regulating their internal temperature, posing a significant risk of internal component overheating. Summary of the Invention

[0004] This application provides a control method, power converter, and control device for a power converter, which can quickly adjust the internal temperature of the power converter and reduce the risk of over-temperature of its internal components.

[0005] In a first aspect, this application provides a control method for a power converter, comprising: when the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold, reducing the output power of the power converter by a first derating step size corresponding to the first temperature threshold; after a first preset time period, acquiring the temperature detection value of the power converter; when the acquired temperature detection value is greater than or equal to a preset second temperature threshold, reducing the output power of the power converter by a second derating step size corresponding to the second temperature threshold; wherein the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or, when the acquired temperature detection value is less than a preset upper safety threshold, restoring the normal output power of the power converter; wherein the upper safety threshold is less than or equal to the first temperature threshold.

[0006] Secondly, this application provides a power converter, comprising: a temperature detector for detecting the temperature of the power converter and obtaining a temperature detection value of the power converter; and a controller connected to the temperature detector and configured to: reduce the output power of the power converter by a first derating step size corresponding to the first temperature threshold when the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold; after a first preset time period, obtain the temperature detection value of the power converter; and reduce the output power of the power converter by a second derating step size corresponding to the second temperature threshold when the obtained temperature detection value is greater than or equal to a preset second temperature threshold; wherein the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or, restore the normal output power of the power converter when the obtained temperature detection value is less than a preset upper safety threshold; wherein the upper safety threshold is less than or equal to the first temperature threshold.

[0007] Thirdly, this application provides a control device for a power converter, comprising: a temperature detection module for detecting the temperature of the power converter and obtaining a temperature detection value of the power converter; a power adjustment module connected to the temperature detection module for reducing the output power of the power converter according to a first derating step size corresponding to the first temperature threshold when the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold; after a first preset time period, obtaining the temperature detection value of the power converter; and if the obtained temperature detection value is greater than or equal to a preset second temperature threshold, reducing the output power of the power converter according to a second derating step size corresponding to the second temperature threshold; wherein the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or, if the obtained temperature detection value is less than a preset upper safety threshold, restoring the normal output power of the power converter; wherein the upper safety threshold is less than or equal to the first temperature threshold.

[0008] In several embodiments provided in this application, temperature thresholds and corresponding derating steps are set in stages, and the output power of the power converter is dynamically adjusted based on the temperature detection value of the power converter. This allows the power converter to promptly regulate the temperature by using different derating steps when the temperature detection value exceeds different temperature thresholds. In this way, the internal temperature of the power converter can be quickly adjusted, effectively reducing the risk of overheating of internal components. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0010] Figure 1 This is a schematic flowchart of a control method for a power converter provided in one embodiment of this application.

[0011] Figure 2 This is a schematic flowchart of a control method for a power converter provided in another embodiment of this application.

[0012] Figure 3 Temperature-power regulation curve of a power converter provided in one embodiment of this application.

[0013] Figure 4 Temperature-power regulation curve of a power converter is provided for another embodiment of this application.

[0014] Figure 5 Temperature-power regulation curve of a power converter is provided for another embodiment of this application.

[0015] Figure 6 Temperature-power regulation curve of a power converter is provided for another embodiment of this application.

[0016] Figure 7 This is a schematic diagram of a power converter provided in one embodiment of this application.

[0017] Figure 8 This is a schematic diagram of the control device structure of a power converter provided in one embodiment of this application. Detailed Implementation

[0018] The technical solutions in 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.

[0019] In the description of the embodiments of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] Power converters are widely used in scenarios such as power conversion, distributed power supply, and energy storage regulation. During actual operation, power converters generate a lot of heat due to energy conversion. When they operate for a long time under high power output or high temperature environment, their internal key components, such as power switching transistors, inductors, and capacitors, are prone to performance degradation or even overheating damage due to high operating temperature, thus affecting the stable operation of the power converter.

[0021] To mitigate the risk of overheating of internal components, power converters employ temperature regulation mechanisms in related technologies. Specifically, when the ambient temperature exceeds a set safe temperature range, the output power is reduced in fixed steps, and power output is forcibly stopped when the ambient temperature exceeds a critical temperature threshold. However, this temperature regulation method is relatively simple, lacking rapid response to temperature changes, and is prone to response lag or overshoot during power regulation. Therefore, it is difficult to achieve rapid and accurate control of the internal temperature of the power converter, and a significant risk of overheating of internal components remains.

[0022] Take microinverters as an example. As a crucial component in photovoltaic power generation systems, microinverters convert direct current (DC) to alternating current (AC) in a photovoltaic system, typically installed on or near the back of photovoltaic modules. Due to their compact structure, limited installation space, and poor ventilation and heat dissipation, they are susceptible to external high temperatures and solar radiation during continuous operation, leading to high internal temperatures. To ensure the safe and stable operation of microinverters, it is necessary to monitor their internal temperature and dynamically adjust their output power based on temperature changes to effectively suppress internal temperature rise and reduce performance degradation or overheating damage to internal components. However, while some microinverters in related technologies possess temperature detection and regulation functions, the adjustment methods are relatively simple. They typically employ fixed-step reduction of output power or forced power output stoppage based on a critical temperature threshold for overheat protection, lacking a rapid response and accurate control mechanism for temperature changes, thus still posing a significant risk of internal component overheating.

[0023] Therefore, it is necessary to provide a method that can quickly adjust the internal temperature of a power converter to reduce the risk of overheating of internal components and improve its operational stability.

[0024] Please see Figure 1 This application provides a control method for a power converter. This control method can be applied to a control device for the power converter. The control device can be an electronic device with certain computing capabilities. Alternatively, the control device can refer to a software program running on an electronic device. In a specific example, the control device can be a controller for the power converter.

[0025] The control method for this power converter includes the following steps.

[0026] S110, if the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold, the output power of the power converter is reduced according to a first derating step size corresponding to the first temperature threshold.

[0027] S120, after the first preset time, acquire the temperature detection value of the power converter.

[0028] S130, if the acquired temperature detection value is greater than or equal to a preset second temperature threshold, reduce the output power of the power converter according to a second derating step size corresponding to the second temperature threshold; wherein the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or, if the acquired temperature detection value is less than a preset upper safety threshold, restore the normal output power of the power converter; wherein the upper safety threshold is less than or equal to the first temperature threshold.

[0029] In this embodiment, the power converter can be an inverter, a rectifier, or other power electronic device with power conversion capabilities. The power converter can, for example, obtain its temperature value using a temperature detector. The temperature detector can be located inside the power converter, for example, near key heat-generating components such as power switching transistors, filter inductors, and bus capacitors, to detect temperature information in key areas inside the power converter and output the temperature value. The temperature detector can be a thermistor device, such as a negative temperature coefficient thermistor (NTC) as the temperature sensing element.

[0030] Because the internal temperature of a power converter changes continuously, under normal operating conditions, the detected temperature value of the power converter usually remains within a safe temperature range, and its internal temperature may gradually rise as the power converter continues to operate. When the detected temperature value of the power converter is greater than or equal to a preset first temperature threshold, the control device immediately takes protective measures, reducing the output power of the power converter according to a first derating step size corresponding to the first temperature threshold, thereby promptly reducing the internal temperature and preventing performance degradation of internal components due to excessive temperature. Subsequently, after a first preset time period, the control device re-acquires the temperature detection value of the power converter and further adjusts the output power of the power converter based on the actual change in the temperature detection value. Specifically, if the re-acquired temperature detection value is greater than or equal to a preset second temperature threshold, the output power is reduced according to a second derating step size corresponding to the second temperature threshold. Here, the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size. This accelerates the adjustment speed of the output power, achieving rapid control of the internal temperature of the power converter. If the temperature reading re-acquired by the control device is lower than the preset upper safety threshold, the power converter's normal output power is restored. The upper safety threshold is less than or equal to the first temperature threshold. This allows the power converter to re-enter normal operation after the temperature drops back to the safe range, helping to improve its operating efficiency and maintain stable output.

[0031] The control method in this embodiment sets temperature thresholds and corresponding derating steps in stages, and dynamically adjusts the output power of the power converter based on its temperature detection value. When the detected temperature exceeds different temperature thresholds, the power converter reduces its output power using the corresponding derating step, thereby achieving indirect temperature control. Furthermore, the derating step increases progressively with the temperature threshold, accelerating the response speed of temperature control at higher temperatures. Simultaneously, when the detected temperature drops below the upper safety threshold, the power converter's normal output power is restored, effectively improving its operating efficiency while ensuring safe operation. Through this graded dynamic adjustment mechanism, the power converter can quickly respond to temperature changes, effectively regulating its internal temperature, reducing the risk of overheating of internal components, and thus improving the operational stability of the power converter.

[0032] In some embodiments, if the acquired temperature detection value is greater than or equal to a first temperature threshold and less than a second temperature threshold, the control device may reduce the output power of the power converter according to a first derating step size; and then return to the step of acquiring the temperature detection value of the power converter after executing a first preset time.

[0033] Please see Figure 2In this embodiment, the control method for the power converter further includes step S140, which involves reducing the output power of the power converter according to a first derating step size when the acquired temperature detection value is greater than or equal to a first temperature threshold and less than a second temperature threshold. After executing step S140, the control device returns to step S120 to reacquire the temperature detection value and determine the threshold range in which the latest acquired temperature detection value falls. If the latest acquired temperature detection value is still between the first and second temperature thresholds, step S140 continues. If the latest acquired temperature detection value is not between the first and second temperature thresholds, step S130 is executed, which involves reducing the output power of the power converter according to a second derating step size corresponding to the second temperature threshold when the latest acquired temperature detection value is greater than or equal to a preset second temperature threshold; or restoring the normal output power of the power converter when the latest acquired temperature detection value is less than a preset upper safety threshold. Through the above-described cyclic mechanism, the control device can achieve differentiated dynamic derating adjustment based on changes in the temperature detection value, thereby improving the comprehensiveness and accuracy of temperature control of the power converter.

[0034] In some embodiments, if the acquired temperature detection value is greater than or equal to a preset second temperature threshold, the control device, in response to the acquired temperature detection value being within a specified temperature range, reduces the output power of the power converter according to a derating step size corresponding to the specified temperature range. The specified temperature range is one of a plurality of preset derating temperature ranges, and for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the higher lowest temperature is not less than the derating step size corresponding to the derating temperature range with the lower lowest temperature. The derating step size corresponding to the specified temperature range includes a second derating step size. Correspondingly, the control device also acquires the temperature detection value of the power converter as the drated temperature after the output power of the power converter has been reduced for a specified duration. The specified duration is the derating duration corresponding to the specified temperature range, and for any two derating temperature ranges, the derating duration corresponding to the derating temperature range with the higher lowest temperature is not less than the derating duration corresponding to the derating temperature range with the lower lowest temperature. Then, the specified temperature range where the derating temperature is located is determined as the derating temperature range: if the derating temperature range is a different derating temperature range from the specified temperature range, the derating temperature range is taken as the new specified temperature range, and the step of reducing the output power of the power converter according to the derating step size corresponding to the specified temperature range is returned; if the derating temperature range is a safe temperature range, the normal output power of the power converter is restored; wherein, the highest temperature in the safe temperature range is the upper limit safe threshold.

[0035] In this embodiment, the control method for the power converter further includes a graded adjustment mechanism for multiple derating temperature ranges. Specifically, when the acquired temperature detection value is greater than or equal to a preset second temperature threshold, the control device can determine the specified temperature range it falls within based on the temperature detection value. The specified temperature range is one of a plurality of preset derating temperature ranges, which can be defined by different temperature thresholds. For example, the second temperature threshold and a preset third temperature threshold form one derating temperature range, and the third temperature threshold and a preset fourth temperature threshold form another derating temperature range. The fourth temperature threshold is greater than the third temperature threshold, and the third temperature threshold is greater than the second temperature threshold. In practical applications, the number of derating temperature ranges can be set according to specific needs and can be extended to the standby protection threshold of the power converter. When the temperature detection value of the power converter is less than the standby protection threshold, the control device performs graded dynamic adjustment of the power converter's output power. When the temperature detection value of the power converter is not less than the standby protection threshold, the control device performs standby protection control on the power converter, causing the power converter to temporarily stop outputting electrical energy and enter a standby protection state to prevent overheating damage. After determining that the temperature detection value falls within a specified temperature range, the control device reduces the output power of the power converter according to the derating step size corresponding to that specified temperature range. Specifically, for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the higher lowest temperature is not less than the derating step size corresponding to the derating temperature range with the lower lowest temperature. The derating step size corresponding to the specified temperature range includes a second derating step size. This allows for increased output power derating adjustment when the temperature detection value is within the higher derating temperature range, achieving rapid control of the internal temperature of the power converter.

[0036] After the output power of the power converter is reduced for a specified period, the control device can reacquire the temperature detection value of the power converter as the derating temperature. The specified period is the derating duration corresponding to a specified temperature range, and for any two derating temperature ranges, the derating duration corresponding to the derating temperature range with the higher lowest temperature is not less than the derating duration corresponding to the derating temperature range with the lower lowest temperature. This allows for a longer adjustment period of the output power when the detected temperature is within the higher derating temperature range, achieving more effective temperature regulation. Subsequently, the control device uses the specified temperature range containing the derating temperature as the derating temperature range. If the derating temperature range is different from the original specified temperature range, the derating temperature range is used as the new specified temperature range, and the process returns to reduce the output power of the power converter according to the derating step size corresponding to the specified temperature range. Through this cyclical mechanism, the power converter can achieve continuous and stable power regulation even at high temperatures. When the derating temperature range is within the safe temperature range, the normal output power of the power converter can be restored; the highest temperature within the safe temperature range is the upper limit safety threshold. This allows the power converter to improve its operating efficiency while ensuring safe operation.

[0037] Please see Figure 3 .exist Figure 3 In the diagram, the horizontal axis represents the temperature detection value T of the power converter, and the vertical axis represents the output power P of the power converter. Before T0, if the temperature detection value T of the power converter is greater than the second temperature threshold T_down2, it indicates that the power converter is currently in a severely overheated state. At this time, the control device uses a second derating step size corresponding to the second temperature threshold to perform a significant derating adjustment on the power converter to quickly reduce the output power and achieve emergency thermal protection for its internal components. As the temperature detection value T gradually decreases, when it falls to a range below the second temperature threshold T_down2 and greater than or equal to the first temperature threshold T_down1, it indicates that the power converter has escaped the severely overheated state. At this time, the control device can continue to perform derating control on the power converter using the first derating step size. Compared to the previous stage, the power adjustment amplitude in this stage is moderately reduced, which can improve the stability of temperature regulation. As the temperature detection value T further decreases, when it falls to a range below the first temperature threshold T_down1 and greater than or equal to the upper safety threshold T_high (where the upper safety threshold T_high is less than the first temperature threshold T_down1), it indicates that the temperature of the power converter is gradually approaching the safe temperature range. With the control device continuously performing multiple power regulation operations, the temperature detection value T can be maintained within the safe temperature range between the upper safety threshold T_high and the lower safety threshold T_low.

[0038] Therefore, this embodiment, through the aforementioned temperature range adjustment mechanism, can achieve graded derating control for different derating temperature ranges. At the same time, by combining the derating duration with continuous and stable adjustment of the power converter, it can further accelerate the temperature adjustment speed and improve the operational stability of the power converter.

[0039] In some embodiments, the control device may restore the normal output power of the power converter if the acquired temperature detection value is less than an upper safety threshold and greater than or equal to a preset lower safety threshold, wherein the upper safety threshold is greater than the lower safety threshold. Alternatively, if the acquired temperature detection value is less than a preset first derating temperature threshold, the control device may increase the output power of the power converter according to a first derating step size corresponding to the first derating temperature threshold, wherein the first derating temperature threshold is less than or equal to the lower safety threshold.

[0040] In this embodiment, the control device restores or increases the output power of the power converter when the acquired temperature detection value is less than the upper safety threshold. Specifically, when the temperature detection value is less than the upper safety threshold but greater than or equal to a preset lower safety threshold, it indicates that the power converter's temperature detection value is within the safe temperature range. At this time, the control device can restore the normal output power of the power converter to improve its operating efficiency and maintain its stable output. When the temperature detection value is less than a preset first derating temperature threshold, the control device can increase the output power of the power converter according to a first derating step size corresponding to the first derating temperature threshold; wherein the first derating temperature threshold is less than or equal to the lower safety threshold. Through derating adjustment, the power converter can quickly recover to normal output power after the high temperature conditions improve, reducing or avoiding the problem of decreased energy utilization caused by prolonged low-power operation. In this way, the operating efficiency of the power converter can be further improved while ensuring its safe operation.

[0041] Please see Figure 4 .exist Figure 4In the diagram, the horizontal axis represents the temperature detection value T of the power converter, and the vertical axis represents the output power P of the power converter. Before T0, the temperature detection value T of the power converter is less than the first derating temperature threshold T_up1 (here, the first derating temperature threshold T_up1 is less than the lower safety threshold T_low), indicating that the power converter is currently in a low-temperature state. At this time, the control device uses a first derating step size corresponding to the first derating temperature threshold to increase the output power of the power converter, causing its internal temperature to rise rapidly. As the temperature detection value T gradually rises, when it reaches a range greater than the first derating temperature threshold T_up1 and less than the lower safety threshold T_low, it indicates that the temperature of the power converter is gradually approaching the safe temperature range. As the control device continuously performs multiple power adjustment operations, the temperature detection value T can be maintained within the safe temperature range between the upper safety threshold T_high and the lower safety threshold T_low.

[0042] In some embodiments, if the acquired temperature detection value is less than a preset first derating temperature threshold, the control device, in response to the acquired temperature detection value being within a specified derating temperature range, increases the output power of the power converter according to a derating step size corresponding to the specified derating temperature range. The specified derating temperature range is one of a plurality of preset derating temperature ranges, and for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the lower highest temperature is not less than the derating step size corresponding to the derating temperature range with the higher highest temperature. The derating step size corresponding to the specified derating temperature range includes the first derating step size. Correspondingly, the control device also acquires the temperature detection value of the power converter as the derating temperature after the output power of the power converter has been increased for a specified derating time. The specified derating time is the derating time corresponding to the specified derating temperature range, and for any two derating temperature ranges, the derating time corresponding to the derating temperature range with the lower highest temperature is not less than the derating time corresponding to the derating temperature range with the higher highest temperature. Then, the specified derating temperature range where the derating temperature is located is determined as the derating temperature range: if the derating temperature range is a different derating temperature range from the specified derating temperature range, the derating temperature range is taken as the new specified derating temperature range, and the step of increasing the output power of the power converter according to the derating step size corresponding to the specified derating temperature range is returned; if the derating temperature range is a safe temperature range, the normal output power of the power converter is restored; wherein, the lowest temperature in the safe temperature range is the lower limit safe threshold.

[0043] In this embodiment, the control method for the power converter further includes a graded derating adjustment mechanism for multiple derating temperature ranges. Specifically, when the acquired temperature detection value is less than a preset first derating temperature threshold, the control device can determine the specified derating temperature range in which the temperature detection value falls. The specified derating temperature range is one of a plurality of preset derating temperature ranges, which can be defined by different derating temperature thresholds. For example, the first derating temperature threshold and a preset second derating temperature threshold form one derating temperature range, and the second derating temperature threshold and a preset third derating temperature threshold form another derating temperature range. The first derating temperature threshold is greater than the second derating temperature threshold, and the second derating temperature threshold is greater than the third derating temperature threshold. In practical applications, the number of derating temperature ranges can be set according to specific requirements. After determining that the temperature detection value falls within the specified derating temperature range, the control device increases the output power of the power converter according to the derating step size corresponding to the specified derating temperature range. Specifically, for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the lower highest temperature is not less than the derating step size corresponding to the derating temperature range with the higher highest temperature. The derating step size corresponding to the specified derating temperature range includes the first derating step size. In this way, when the temperature detection value is in the lower derating temperature range, the derating adjustment of the output power can be increased, achieving a rapid increase in the internal temperature of the power converter.

[0044] After the output power of the power converter is increased for a specified derating time, the control device can reacquire the temperature detection value of the power converter as the derating temperature. The specified derating time is the derating time corresponding to a specified derating temperature range, and for any two derating temperature ranges, the derating time corresponding to the derating temperature range with the lower highest temperature is not less than the derating time corresponding to the derating temperature range with the higher highest temperature. This allows for a longer adjustment time of the output power when the temperature detection value is in the lower derating temperature range, achieving more effective temperature regulation. Subsequently, the control device uses the specified derating temperature range containing the derating temperature as the derating temperature range. If the derating temperature range is different from the original specified derating temperature range, the derating temperature range is used as the new specified derating temperature range, and the process returns to the step of increasing the output power of the power converter according to the derating step size corresponding to the specified derating temperature range. Through this cyclical mechanism, the power converter can achieve continuous and stable power regulation even at low temperatures. When the rated temperature range falls within the safe temperature range, the power converter's normal output power can be restored; the lowest temperature within the safe temperature range is the lower safety threshold. This allows the power converter to improve its operating efficiency while ensuring safe operation.

[0045] Please see Figure 5 .exist Figure 5 In the diagram, the horizontal axis represents the temperature detection value T of the power converter, and the vertical axis represents the output power P of the power converter. During the period when the temperature detection value T of the power converter is greater than the second temperature threshold T_down2, the control device derating the power converter and gradually reducing the temperature detection value T through a tiered derating method. After the temperature detection value T successively decreases to the second temperature threshold T_down2, the first temperature threshold T_down1, and the upper safety threshold T_high, it enters the safe temperature range between the upper safety threshold T_high and the lower safety threshold T_low. Subsequently, the temperature detection value T decreases to below the first derating temperature threshold T_up1, at which point the control device derating the power converter. After the temperature detection value T successively rises to the first derating temperature threshold T_up1 and the lower safety threshold T_low, it re-enters and stably maintains within the safe temperature range between the upper safety threshold T_high and the lower safety threshold T_low.

[0046] Please see Figure 6 .exist Figure 6 In the diagram, the horizontal axis represents the temperature detection value T of the power converter, and the vertical axis represents the output power P of the power converter. During the period when the temperature detection value T of the power converter is less than the first derating temperature threshold T_up1, the control device performs derating adjustment on the power converter, gradually increasing the temperature detection value T through a graded derating method. After the temperature detection value T successively rises to the first derating temperature threshold T_up1 and the lower safety threshold T_low, it enters the safe temperature range between the upper safety threshold T_high and the lower safety threshold T_low. Subsequently, the temperature detection value T rises above the first derating temperature threshold T_down1, at which point the control device performs derating adjustment on the power converter. After the temperature detection value T successively falls to the first derating temperature threshold T_down1 and the upper safety threshold T_high, it re-enters and stably maintains within the safe temperature range between the upper safety threshold T_high and the lower safety threshold T_low.

[0047] Therefore, this embodiment, through the above-mentioned temperature range adjustment mechanism, can achieve graded derating control for different derating temperature ranges and graded scaling control for different scaling temperature ranges, ultimately keeping the temperature detection value of the power converter within a safe temperature range, thereby improving the operating efficiency and stability of the power converter.

[0048] In some embodiments, the power converter may include multiple temperature detection values. If the multiple temperature detection values ​​are different, the control device selects the largest one as the temperature detection value for the power converter.

[0049] In this embodiment, the power converter is equipped with multiple temperature detectors, which can be installed at different locations within the power converter to monitor the temperature status of multiple parts, thereby comprehensively reflecting the internal heat distribution of the power converter. Since the heat dissipation conditions and heating status vary in different parts of the power converter, the various temperature detection values ​​may differ. When multiple temperature detection values ​​are obtained that differ, the control device compares the multiple temperature detection values ​​and selects the maximum value as the temperature detection value of the power converter. Furthermore, based on the selected maximum temperature detection value, the control device can dynamically adjust the output power of the power converter according to the aforementioned limit or escalation control mechanism.

[0050] Specifically, when the power adjustment directions (derating or derating) corresponding to multiple temperature detection values ​​are inconsistent, the control device adjusts the output power of the power converter according to the following priority order: reduce output power > keep output power unchanged > increase output power. This ensures that when any detection point is at risk of high temperature, the control device can prioritize derating to suppress overheating risk; if no high temperature risk is detected, the output power is kept unchanged; only when all detection points are at risk of low temperature is the output power increased, thereby improving the safety of the power converter. Conversely, when the power adjustment directions corresponding to multiple temperature detection values ​​are consistent but the power adjustment step sizes are inconsistent, the control device adjusts the output power of the power converter according to the following priority order: among multiple derating step sizes, the larger derating step size is prioritized; or, among multiple derating step sizes, the smaller derating step size is prioritized. This ensures that when the power adjustment direction corresponding to all temperature detection values ​​is derating, the control device prioritizes the largest derating step size for adjustment to enhance cooling and quickly alleviate high temperature risk. When all temperature detection values ​​correspond to power adjustment directions of derating, the control device prioritizes the smallest derating step size for adjustment, so that the power converter can smoothly restore normal power output within a controllable range, thereby improving the stability of the power converter.

[0051] Please see Figure 7This application also provides a power converter 100. The power converter 100 includes a temperature detector 110 and a controller 120. The temperature detector 110 detects the temperature of the power converter and obtains a temperature detection value. The controller 120 is connected to the temperature detector 110 and is configured to: reduce the output power of the power converter by a first derating step size corresponding to the first temperature threshold when the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold; after a first preset time period, obtain the temperature detection value of the power converter; if the obtained temperature detection value is greater than or equal to a preset second temperature threshold, reduce the output power of the power converter by a second derating step size corresponding to the second temperature threshold; wherein the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or, if the obtained temperature detection value is less than a preset upper safety threshold, restore the normal output power of the power converter; wherein the upper safety threshold is less than or equal to the first temperature threshold.

[0052] In this embodiment, the power converter sets temperature thresholds and corresponding derating steps in stages, and dynamically adjusts its output power based on the temperature detection value of the power converter. When the temperature detection value exceeds different temperature thresholds, the power converter uses different derating steps to achieve timely temperature control, thereby quickly adjusting the internal temperature of the power converter and effectively reducing the risk of over-temperature of internal components.

[0053] In some embodiments, the controller 120 is further configured to: reduce the output power of the power converter by a first derating step size if the acquired temperature detection value is greater than or equal to a first temperature threshold and less than a second temperature threshold. The process then returns to the step of acquiring the temperature detection value of the power converter after executing a first preset time.

[0054] In some embodiments, the controller 120 is further configured to: in response to an acquired temperature detection value falling within a specified temperature range, reduce the output power of the power converter according to a derating step size corresponding to the specified temperature range; wherein the specified temperature range is one of a preset plurality of derating temperature ranges, and for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the higher lowest temperature is not less than the derating step size corresponding to the derating temperature range with the lower lowest temperature, and the derating step size corresponding to the specified temperature range includes a second derating step size. After the output power of the power converter is reduced for a specified duration, the temperature detection value of the power converter is acquired as the drated temperature; wherein the specified duration is the derating duration corresponding to the specified temperature range, and for any two derating temperature ranges, the derating duration corresponding to the derating temperature range with the higher lowest temperature is not less than the derating duration corresponding to the derating temperature range with the lower lowest temperature. Determine the specified temperature range where the derating temperature falls, as the derating temperature range: If the derating temperature range is a different derating temperature range from the specified temperature range, use the derating temperature range as the new specified temperature range, and return to execute the step of reducing the output power of the power converter according to the derating step size corresponding to the specified temperature range; If the derating temperature range is a safe temperature range, restore the normal output power of the power converter; wherein, the highest temperature in the safe temperature range is the upper limit safe threshold.

[0055] In some embodiments, the controller 120 is further configured to: restore the normal output power of the power converter when the acquired temperature detection value is less than an upper safety threshold and greater than or equal to a preset lower safety threshold, wherein the upper safety threshold is greater than the lower safety threshold. Alternatively, when the acquired temperature detection value is less than a preset first derating temperature threshold, increase the output power of the power converter by a first derating step size corresponding to the first derating temperature threshold; wherein the first derating temperature threshold is less than or equal to the lower safety threshold.

[0056] In some embodiments, the controller 120 is further configured to: in response to an acquired temperature detection value falling within a specified derating temperature range, increase the output power of the power converter according to a derating step size corresponding to the specified derating temperature range; wherein the specified derating temperature range is one of a preset plurality of derating temperature ranges, and for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the lower highest temperature is not less than the derating step size corresponding to the derating temperature range with the higher highest temperature, and the derating step size corresponding to the specified derating temperature range includes the first derating step size. After the output power of the power converter is increased for a specified derating time, the temperature detection value of the power converter is acquired as the derating temperature; wherein the specified derating time is the derating time corresponding to the specified derating temperature range, and for any two derating temperature ranges, the derating time corresponding to the derating temperature range with the lower highest temperature is not less than the derating time corresponding to the derating temperature range with the higher highest temperature. A specified derating temperature range is determined as the derating temperature range: if the derating temperature range is a different derating temperature range from the specified derating temperature range, the derating temperature range is taken as the new specified derating temperature range, and the step of increasing the output power of the power converter according to the derating step size corresponding to the specified derating temperature range is returned; if the derating temperature range is a safe temperature range, the normal output power of the power converter is restored; wherein, the lowest temperature in the safe temperature range is the lower limit safe threshold.

[0057] In some embodiments, if the temperature detection values ​​obtained by the multiple temperature detectors 110 are different, the largest temperature detection value is selected as the temperature detection value of the power converter.

[0058] For other specific functions and effects of the power converter, please refer to the foregoing embodiments for explanation, and they will not be repeated here.

[0059] Please see Figure 8 This application also provides a control device 200 for a power converter. The control device 200 includes a temperature detection module 210 and a power regulation module 220.

[0060] Temperature detection module 210 is used to detect the temperature of the power converter and obtain the temperature detection value of the power converter.

[0061] The power regulation module 220, connected to the temperature detection module 210, is used to reduce the output power of the power converter according to a first derating step size corresponding to the first temperature threshold when the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold. After a first preset time, the temperature detection value of the power converter is acquired: if the acquired temperature detection value is greater than or equal to a preset second temperature threshold, the output power of the power converter is reduced according to a second derating step size corresponding to the second temperature threshold; wherein the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or, if the acquired temperature detection value is less than a preset upper safety threshold, the normal output power of the power converter is restored; wherein the upper safety threshold is less than or equal to the first temperature threshold.

[0062] For the other specific functions and effects of each module in the control device of the power converter, please refer to the foregoing embodiments for comparison and explanation, and will not be repeated here.

[0063] This application also provides an electronic device, which includes a memory and a processor. The memory stores at least one computer program, which is loaded and executed by the processor to implement the control method in any of the above embodiments.

[0064] In this embodiment, the electronic device may include a memory and a processor. The memory may be random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (EEPROM), registers, a hard disk, a removable disk, etc. The memory may store computer instructions, and when the computer instructions stored in the memory are executed by the processor, the processor can be used to perform the aforementioned control method. In some embodiments, the electronic device may also refer to the controller of a power converter.

[0065] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape) or a semiconductor medium (e.g., solid-state disk (SSD)).

[0066] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0067] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments of this application, and are not intended to limit the scope of the invention.

[0068] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0069] It is understood that the various embodiments described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0070] Unless otherwise stated, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0071] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0072] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0073] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0074] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0075] The above description is merely a specific embodiment of this application, but the scope of protection of this invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A control method for a power converter, characterized in that, include: If the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold, the output power of the power converter is reduced according to a first derating step size corresponding to the first temperature threshold. After the first preset time period, the temperature detection value of the power converter is obtained: If the acquired temperature detection value is greater than or equal to a preset second temperature threshold, the output power of the power converter is reduced according to a second derating step size corresponding to the second temperature threshold; wherein the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or... If the acquired temperature detection value is less than the preset upper limit safety threshold, the normal output power of the power converter is restored; wherein the upper limit safety threshold is less than or equal to the first temperature threshold.

2. The control method according to claim 1, characterized in that, The method further includes: If the acquired temperature detection value is greater than or equal to the first temperature threshold and less than the second temperature threshold, the output power of the power converter is reduced according to the first derating step size. After returning to the first preset duration, the step of obtaining the temperature detection value of the power converter is performed.

3. The control method according to claim 2, characterized in that, If the acquired temperature detection value is greater than or equal to a preset second temperature threshold, the output power of the power converter is reduced according to a second derating step size corresponding to the second temperature threshold, including: In response to the acquired temperature detection value being within a specified temperature range, the output power of the power converter is reduced according to the derating step size corresponding to the specified temperature range; wherein, the specified temperature range is one of a plurality of preset derating temperature ranges, and for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the higher lowest temperature is not less than the derating step size corresponding to the derating temperature range with the lower lowest temperature, and the derating step size corresponding to the specified temperature range includes the second derating step size. Accordingly, the method further includes: After the output power of the power converter is reduced for a specified period of time, the temperature detection value of the power converter is obtained as the derating temperature; wherein, the specified period of time is the derating period corresponding to the specified temperature range, and for any two derating temperature ranges, the derating period corresponding to the derating temperature range with the higher lowest temperature is not less than the derating period corresponding to the derating temperature range with the lower lowest temperature. The specified temperature range containing the derating temperature is defined as the derating temperature range: If the derating temperature range is a derating temperature range that is different from the specified temperature range, the derating temperature range is taken as the new specified temperature range, and the step of reducing the output power of the power converter according to the derating step size corresponding to the specified temperature range is returned to be executed. If the derating temperature range is within a safe temperature range, the normal output power of the power converter is restored; wherein, the highest temperature within the safe temperature range is the upper limit safety threshold.

4. The control method according to any one of claims 1-3, characterized in that, If the acquired temperature detection value is less than a preset upper safety threshold, restore the normal output power of the power converter, including: If the acquired temperature detection value is less than the upper safety threshold and greater than or equal to the preset lower safety threshold, the normal output power of the power converter is restored, wherein the upper safety threshold is greater than the lower safety threshold; or, If the acquired temperature detection value is less than a preset first derating temperature threshold, the output power of the power converter is increased according to a first derating step size corresponding to the first derating temperature threshold; wherein the first derating temperature threshold is less than or equal to the lower limit safety threshold.

5. The control method according to claim 4, characterized in that, If the acquired temperature detection value is less than a preset first derating temperature threshold, the output power of the power converter is increased according to a first derating step size corresponding to the first derating temperature threshold, including: In response to the acquired temperature detection value being within a specified derating temperature range, the output power of the power converter is increased according to the derating step size corresponding to the specified derating temperature range; wherein, the specified derating temperature range is one of a plurality of preset derating temperature ranges, and for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the lower highest temperature is not less than the derating step size corresponding to the derating temperature range with the higher highest temperature, and the derating step size corresponding to the specified derating temperature range includes the first derating step size; Accordingly, the method further includes: After the output power of the power converter is increased for a specified derating time, the temperature detection value of the power converter is obtained as the derating temperature; wherein, the specified derating time is the derating time corresponding to the specified derating temperature range, and for any two derating temperature ranges, the derating time corresponding to the derating temperature range with the lower highest temperature is not less than the derating time corresponding to the derating temperature range with the higher highest temperature. The specified derating temperature range within which the derating temperature falls is defined as the derating temperature range: If the derating temperature range is a different derating temperature range from the specified derating temperature range, the derating temperature range is taken as the new specified derating temperature range, and the step of increasing the output power of the power converter according to the derating step size corresponding to the specified derating temperature range is returned to be executed. If the temperature range after derating is within the safe temperature range, the normal output power of the power converter is restored; wherein, the lowest temperature within the safe temperature range is the lower limit safe threshold.

6. The control method according to claim 1, characterized in that, The power converter includes multiple temperature detection values; the method further includes: If the multiple temperature detection values ​​are different, the largest temperature detection value shall be selected as the temperature detection value of the power converter.

7. A power converter, characterized in that, include: A temperature detector is used to detect the temperature of the power converter and obtain the temperature detection value of the power converter. The controller, connected to the temperature detector, is configured to: If the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold, the output power of the power converter is reduced according to a first derating step size corresponding to the first temperature threshold. After a first preset time period, the temperature detection value of the power converter is obtained: if the obtained temperature detection value is greater than or equal to a preset second temperature threshold, the output power of the power converter is reduced according to a second derating step size corresponding to the second temperature threshold; wherein, the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or, if the obtained temperature detection value is less than a preset upper safety threshold, the normal output power of the power converter is restored; wherein, the upper safety threshold is less than or equal to the first temperature threshold.

8. The power converter according to claim 7, characterized in that, The controller is also configured to: If the acquired temperature detection value is greater than or equal to the first temperature threshold and less than the second temperature threshold, the output power of the power converter is reduced according to the first derating step size. After returning to the first preset duration, the step of obtaining the temperature detection value of the power converter is performed.

9. The power converter according to claim 8, characterized in that, The controller is also configured to: In response to the acquired temperature detection value being within a specified temperature range, the output power of the power converter is reduced according to the derating step size corresponding to the specified temperature range; wherein, the specified temperature range is one of a plurality of preset derating temperature ranges, and for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the higher lowest temperature is not less than the derating step size corresponding to the derating temperature range with the lower lowest temperature, and the derating step size corresponding to the specified temperature range includes the second derating step size. After the output power of the power converter is reduced for a specified period of time, the temperature detection value of the power converter is obtained as the derating temperature; wherein, the specified period of time is the derating period corresponding to the specified temperature range, and for any two derating temperature ranges, the derating period corresponding to the derating temperature range with the higher lowest temperature is not less than the derating period corresponding to the derating temperature range with the lower lowest temperature. A specified temperature range containing the derating temperature is determined as the derating temperature range: if the derating temperature range is a different derating temperature range from the specified temperature range, the derating temperature range is taken as the new specified temperature range, and the step of reducing the output power of the power converter according to the derating step size corresponding to the specified temperature range is returned; if the derating temperature range is a safe temperature range, the normal output power of the power converter is restored; wherein, the highest temperature in the safe temperature range is the upper limit safe threshold.

10. The power converter according to any one of claims 7-9, characterized in that, The controller is also configured to: If the acquired temperature detection value is less than the upper safety threshold and greater than or equal to the preset lower safety threshold, the normal output power of the power converter is restored, wherein the upper safety threshold is greater than the lower safety threshold; or, If the acquired temperature detection value is less than a preset first derating temperature threshold, the output power of the power converter is increased according to a first derating step size corresponding to the first derating temperature threshold; wherein the first derating temperature threshold is less than or equal to the lower limit safety threshold.

11. The power converter according to claim 10, characterized in that, The controller is also configured to: In response to the acquired temperature detection value being within a specified derating temperature range, the output power of the power converter is increased according to the derating step size corresponding to the specified derating temperature range; wherein, the specified derating temperature range is one of a plurality of preset derating temperature ranges, and for any two derating temperature ranges, the derating step size corresponding to the derating temperature range with the lower highest temperature is not less than the derating step size corresponding to the derating temperature range with the higher highest temperature, and the derating step size corresponding to the specified derating temperature range includes the first derating step size; After the output power of the power converter is increased for a specified derating time, the temperature detection value of the power converter is obtained as the derating temperature; wherein, the specified derating time is the derating time corresponding to the specified derating temperature range, and for any two derating temperature ranges, the derating time corresponding to the derating temperature range with the lower highest temperature is not less than the derating time corresponding to the derating temperature range with the higher highest temperature. A specified derating temperature range is determined as the derating temperature range: if the derating temperature range is a different derating temperature range from the specified derating temperature range, the derating temperature range is taken as the new specified derating temperature range, and the step of increasing the output power of the power converter according to the derating step size corresponding to the specified derating temperature range is returned; if the derating temperature range is a safe temperature range, the normal output power of the power converter is restored; wherein, the lowest temperature in the safe temperature range is the lower limit safe threshold.

12. The power converter according to claim 7, characterized in that, If the multiple temperature detection values ​​are different, the largest temperature detection value shall be selected as the temperature detection value of the power converter.

13. A control device for a power converter, characterized in that, include: A temperature detection module is used to detect the temperature of the power converter and obtain the temperature detection value of the power converter. A power regulation module, connected to the temperature detection module, is used to reduce the output power of the power converter according to a first derating step size corresponding to the first temperature threshold when the temperature detection value of the power converter is greater than or equal to a preset first temperature threshold. After a first preset time period, the temperature detection value of the power converter is obtained: if the obtained temperature detection value is greater than or equal to a preset second temperature threshold, the output power of the power converter is reduced according to a second derating step size corresponding to the second temperature threshold; wherein, the second temperature threshold is greater than the first temperature threshold, and the second derating step size is greater than or equal to the first derating step size; or, if the obtained temperature detection value is less than a preset upper safety threshold, the normal output power of the power converter is restored; wherein, the upper safety threshold is less than or equal to the first temperature threshold.

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