Power converter, control method and related device

Abstract

The invention discloses a power converter, a control method and a related device. The power converter comprises a power conversion circuit, a controller and N temperature acquisition devices, the controller is configured to control the output power of the power conversion circuit to be adjusted from the current output power to the first output power according to a first control parameter determined by the N first temperatures under the condition that the N first temperatures are not in the preset temperature interval; and under the condition that the output power is the first output power and the N second temperatures are not in the preset temperature interval, controlling the output power of the power conversion circuit to be adjusted from the first output power to the second output power according to a second control parameter determined by the N second temperatures, and adjusting the output power of the power conversion circuit based on a first control parameter and a second control parameter determination mode until the temperatures acquired by the N temperature acquisition devices are within the range of the preset temperature interval. Therefore, the safety and the reliability of the power converter are improved.

Description

Technical Field

[0001] This application relates to the field of power converter technology, and in particular to a power converter, control method and related apparatus. Background Technology

[0002] A power converter is a power electronic device that converts one form of electricity into another. When operating in high-temperature environments, the poor heat dissipation performance of the power converter's cooling system can lead to high temperatures in components such as switching transistors and magnetic devices. High component temperatures can increase component losses, shorten lifespan, or even cause damage, ultimately reducing the power converter's safety and reliability. Summary of the Invention

[0003] To address the aforementioned issues, this application provides a power converter, a control method for the power converter, and related devices, aiming to improve the safety and reliability of the power converter.

[0004] The embodiments of this application disclose the following technical solutions:

[0005] In a first aspect, embodiments of this application provide a power converter, including: a power conversion circuit, a controller, and N temperature acquisition devices, wherein the N temperature acquisition devices are disposed inside the power converter, and N is an integer greater than or equal to 1;

[0006] The controller is configured to determine a first control parameter based on the N first temperatures when the first temperatures collected by the N temperature acquisition devices are not within a preset temperature range, and to adjust the output power of the power conversion circuit from the current output power to the first output power based on the first control parameter.

[0007] When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is within the preset temperature range, the output power of the control power conversion circuit remains unchanged at the first output power.

[0008] When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is not within the preset temperature range, the second control parameter is determined according to the N second temperatures, and the output power of the power conversion circuit is adjusted from the first output power to the second output power according to the second control parameter.

[0009] Based on the determination method of the first and second control parameters, the output power of the power conversion circuit is adjusted until the temperature collected by the N temperature acquisition devices is within the preset temperature range.

[0010] The first control parameter is at least one of pulse width, phase angle, or switching frequency; the second control parameter is at least one of pulse width, phase angle, or switching frequency.

[0011] In conjunction with the first aspect, in one possible implementation, the preset temperature range includes N first temperature ranges. The controller is configured to determine a first control parameter based on M first temperatures when there is a first temperature among the N first temperatures that is greater than the maximum value of the corresponding first temperature range. The controller then controls the output power of the power conversion circuit to be adjusted from the current output power to the first output power based on the first control parameter. Here, M is an integer greater than or equal to 1 and less than or equal to N, and M represents the number of first temperatures that are greater than the maximum value of the corresponding first preset temperature range.

[0012] In conjunction with the first aspect, in one possible implementation, the preset temperature range is the second temperature range. The controller is configured to determine a first control parameter based on P first temperatures when there is a first temperature among N first temperatures that is greater than the maximum value of the second temperature range. The controller then controls the output power of the power conversion circuit to be adjusted from the current output power to the first output power based on the first control parameter. Here, P is an integer greater than or equal to 1 and less than or equal to N, and P represents the number of first temperatures that are greater than the maximum value of the second temperature range.

[0013] In conjunction with the first aspect, in one possible implementation, the controller is further configured to control the output power of the power conversion circuit to be zero when there is a temperature greater than a warning temperature threshold among the temperatures collected by the N temperature acquisition devices.

[0014] In conjunction with the first aspect, in one possible implementation, the power converter further includes: N low-pass filter circuits, each of which corresponds to one of the N temperature acquisition devices, with the first end of each low-pass filter circuit connected to the corresponding temperature acquisition device and the second end of each low-pass filter circuit connected to the controller.

[0015] The low-pass filter circuit is used to perform low-pass filtering on the temperature data collected by the corresponding temperature acquisition device, and then send the processed temperature data to the controller.

[0016] In conjunction with the first aspect, in one possible implementation, the power converter further includes: an analog-to-digital conversion circuit, the first end of which is connected to N temperature acquisition devices, and the second end of which is connected to a controller;

[0017] The analog-to-digital converter circuit is used to perform analog-to-digital conversion on the analog signals collected by N temperature acquisition devices, and send the resulting N digital signals to the controller.

[0018] In conjunction with the first aspect, in one possible implementation, the analog-to-digital conversion circuit is integrated inside the controller.

[0019] Secondly, this application provides a micro inverter, which includes an inverter circuit, a first controller, and N temperature acquisition devices. The N temperature acquisition devices are disposed inside the power converter, where N is an integer greater than or equal to 1.

[0020] The first controller is configured to determine a first control parameter based on the N first temperatures when the first temperatures collected by the N temperature acquisition devices are not within a preset temperature range, and to control the output power of the power conversion circuit to be adjusted from the current output power to the first output power based on the first control parameter.

[0021] When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is within the preset temperature range, the output power of the control power conversion circuit remains unchanged at the first output power.

[0022] When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is not within the preset temperature range, the second control parameter is determined according to the N second temperatures, and the output power of the power conversion circuit is adjusted from the first output power to the second output power according to the second control parameter.

[0023] Based on the determination method of the first and second control parameters, the output power of the power conversion circuit is adjusted until the temperature collected by the N temperature acquisition devices is within the preset temperature range.

[0024] The first control parameter is at least one of pulse width, phase angle, or switching frequency; the second control parameter is at least one of pulse width, phase angle, or switching frequency.

[0025] Thirdly, embodiments of this application provide a control method for a power converter, the method comprising:

[0026] Obtain the first temperature collected by N temperature acquisition devices of the power converter;

[0027] If the first temperature collected by N temperature acquisition devices is not within the preset temperature range, a first control parameter is determined based on the N first temperatures, and the output power of the power conversion circuit of the power converter is adjusted from the current output power to the first output power based on the first control parameter.

[0028] When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is within the preset temperature range, the output power of the control power conversion circuit remains unchanged at the first output power.

[0029] When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is not within the preset temperature range, the second control parameter is determined according to the N second temperatures, and the output power of the power conversion circuit is adjusted from the first output power to the second output power according to the second control parameter.

[0030] Based on the determination method of the first and second control parameters, the output power of the power conversion circuit is adjusted until the temperature collected by the N temperature acquisition devices is within the preset temperature range.

[0031] The first control parameter is at least one of pulse width, phase angle, or switching frequency; the second control parameter is at least one of pulse width, phase angle, or switching frequency.

[0032] In conjunction with the third aspect, in one possible implementation, the preset temperature range includes N first temperature ranges. When the first temperatures collected by the N temperature acquisition devices are not within the preset temperature range, a first control parameter is determined based on the N first temperatures. The output power of the power converter's power conversion circuit is then adjusted from the current output power to the first output power based on the first control parameter, including:

[0033] If there is a first temperature among N first temperatures that is greater than the maximum value of the corresponding first temperature range, a first control parameter is determined based on M first temperatures, and the output power of the power conversion circuit is adjusted from the current output power to the first output power based on the first control parameter; where M is an integer greater than or equal to 1 and less than or equal to N, and M represents the number of first temperatures that are greater than the maximum value of the corresponding first preset temperature range.

[0034] In conjunction with the third aspect, in one possible implementation, the preset temperature range is the second temperature range. If the first temperatures collected by the N temperature acquisition devices are not within the preset temperature range, a first control parameter is determined based on the N first temperatures. The output power of the power converter's power conversion circuit is then adjusted from the current output power to the first output power based on the first control parameter, including:

[0035] If there is a first temperature among N first temperatures that is greater than the maximum value of the second temperature range, a first control parameter is determined based on P first temperatures, and the output power of the power conversion circuit is adjusted from the current output power to the first output power based on the first control parameter; where P is an integer greater than or equal to 1 and less than or equal to N, and P represents the number of first temperatures that are greater than the maximum value of the second temperature range.

[0036] In conjunction with the third aspect, one possible implementation method also includes:

[0037] If any of the temperatures collected by N temperature acquisition devices exceeds the warning temperature threshold, the output power of the control power conversion circuit will be zero.

[0038] Fourthly, embodiments of this application provide a power supply system that includes a power converter as described in the first aspect, or a micro inverter as described in the second aspect.

[0039] Beneficial effects:

[0040] The power converter provided in this application includes a power conversion circuit, a controller, and N temperature acquisition devices. The controller is configured to, when the first temperature acquired by the N temperature acquisition devices is not within a preset temperature range, determine a first control parameter based on the N first temperatures, and adjust the output power of the power conversion circuit from the current output power to the first output power based on the first control parameter; when the output power is the first output power and the second temperature acquired by the N temperature acquisition devices is within the preset temperature range, control the output power of the power conversion circuit to remain unchanged at the first output power; when the output power is the first output power and the second temperature acquired by the N temperature acquisition devices is not within the preset temperature range, determine a second control parameter based on the N second temperatures, and adjust the output power of the power conversion circuit from the first output power to the second output power based on the second control parameter; and adjust the output power of the power conversion circuit based on the determination method of the first and second control parameters until the temperature acquired by the N temperature acquisition devices is within the preset temperature range; wherein, the first control parameter is at least one of pulse width, phase angle, or switching frequency; and the second control parameter is at least one of pulse width, phase angle, or switching frequency.

[0041] It should be understood that the higher the output power of the power conversion circuit, the higher the temperature of the power converter. Therefore, by comparing the temperatures collected by N temperature acquisition devices with the preset temperature range, it is determined whether the output power of the power conversion circuit needs to be controlled. If the temperatures collected by the N temperature acquisition devices (i.e., the first temperature or the second temperature) are not within the preset temperature range, corresponding control parameters are determined based on the N temperatures, and the output power of the power conversion circuit is adjusted according to the control parameters. This achieves gradual regulation of the power converter's temperature, reduces the probability of increased wear, shortened lifespan, or damage to the power converter's components due to excessive temperature, and improves the safety and reliability of the power converter. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of a power converter provided in an embodiment of this application;

[0044] Figure 2 A schematic diagram of a power converter including a low-pass filter circuit is provided for an embodiment of this application;

[0045] Figure 3 A schematic diagram of a power converter including an analog-to-digital conversion circuit is provided for an embodiment of this application;

[0046] Figure 4a This is a first schematic diagram of a power converter provided in an embodiment of this application;

[0047] Figure 4b This is a second schematic diagram of a power converter provided in an embodiment of this application;

[0048] Figure 4c This is a third schematic diagram of a power converter provided in an embodiment of this application;

[0049] Figure 4d This is a fourth schematic diagram of a power converter provided in an embodiment of this application;

[0050] Figure 5 This is a schematic diagram of a power conversion circuit with a flyback topology provided in an embodiment of this application;

[0051] Figure 6 This is a schematic diagram of a power conversion circuit with an LLC topology provided in an embodiment of this application;

[0052] Figure 7 This is a schematic diagram of a power supply system provided in an embodiment of this application;

[0053] Figure 8 A flowchart illustrating a control method for a power converter provided in an embodiment of this application;

[0054] Figure 9 A schematic diagram of the control flow of a power converter provided in an embodiment of this application;

[0055] Figure 10 This is a schematic diagram of the structure of a control device provided in an embodiment of this application. Detailed Implementation

[0056] The temperature of a power converter can affect the performance of its internal components, such as power loss, lifespan, or failure rate.

[0057] As an example, taking microinverters as a power converter, the heat dissipation performance of a microinverter may be limited by its packaging process. This can lead to significant temperature differences among the internal components during heat dissipation. For instance, the switching transistor operates at 100 degrees Celsius, while the magnetic component operates at 150 degrees Celsius. These temperature differences between multiple components cannot be effectively mitigated by the microinverter's own cooling system. This means that some components inside the microinverter remain at higher temperatures, potentially leading to increased component resistance and thus increased losses; deterioration of component electrical performance, resulting in a shorter lifespan; or, due to the high temperature, overvoltage, overcurrent, arcing, and other faults may occur, further increasing the component failure rate.

[0058] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0059] See Figure 1 This figure is a schematic diagram of the structure of a power converter provided in an embodiment of this application, combined with... Figure 1 As shown in the embodiment of this application, the power converter 10 may include: a power conversion circuit 11, a controller 12, and N temperature acquisition devices 13, wherein the N temperature acquisition devices 13 are disposed inside the power converter 10. Here, N is an integer greater than or equal to 1.

[0060] A power conversion circuit is a power electronic circuit that converts one form of electricity into another. In one possible implementation, the power conversion circuit can be, but is not limited to, a DC-DC converter, a DC-AC converter, an AC-DC converter, etc., without specific limitations.

[0061] In one possible implementation, the power conversion circuit can be an inverter circuit. The topology of the inverter circuit includes, but is not limited to, an active bridge inverter circuit, a flyback boost-full bridge inverter circuit, or a full bridge voltage doubler-full bridge inverter circuit, etc., without specific limitations.

[0062] A temperature acquisition device refers to a device used to collect the temperature of components in a power converter. In one possible implementation, the temperature acquisition device may include, but is not limited to, thermocouples, resistance temperature detectors (RTDs), infrared temperature measuring devices, temperature sensors, thermistors, etc., without specific limitations.

[0063] It should be noted that in this embodiment, multiple temperature acquisition devices can be set at a single temperature measurement point (i.e., the point inside the power converter where the temperature needs to be detected), or each temperature measurement point can have its own temperature acquisition device; no specific limitation is made here. In this embodiment, the first temperature can be the temperature collected by the corresponding temperature acquisition device in a single instance, or the temperature collected by the corresponding temperature acquisition device continuously over a preset time period; no limitation is made here. If the temperature acquisition device continuously collects temperatures over a preset time period (assuming K temperatures, where K is an integer greater than or equal to 1), any one of the average, mode, maximum, minimum, etc., values ​​of the K temperatures can be used as the first temperature collected by the temperature acquisition device; no specific limitation is made here.

[0064] The controller 12 is configured to determine a first control parameter based on the N first temperatures when the first temperatures collected by the N temperature acquisition devices are not within a preset temperature range, and to adjust the output power of the power conversion circuit 11 from the current output power to the first output power based on the first control parameter.

[0065] A controller, in the context of a power converter, refers to the main control device used to change parameters such as the on / off state, impedance, and duty cycle of components in the power conversion circuit, thereby controlling the output power of the power conversion circuit. The controller receives input signals, processes and calculates them internally, and outputs corresponding control signals to achieve precise control of the power conversion circuit, ensuring that the power conversion circuit operates stably according to predetermined requirements and performance.

[0066] A preset temperature range refers to the temperature range within which a power conversion circuit can operate normally. It should be noted that a preset temperature range can be a single range or include multiple sub-ranges. For example, a power conversion circuit includes a switching transistor and a resistor. The normal operating temperature range for the switching transistor is 70℃~80℃, and the normal operating temperature range for the resistor is 75℃~90℃. Therefore, the preset temperature range could be 75℃~80℃, and the preset temperatures could be 70℃~80℃ (corresponding to the switching transistor) and 75℃~90℃ (corresponding to the resistor).

[0067] The output power of a power converter refers to the amount of AC power that it can continuously and stably output after converting one form of electricity into another under specific operating conditions.

[0068] The first control parameter refers to the parameter used to control the output power of the power conversion circuit to be adjusted from the current output power to the first output power. In the embodiments of this application, the first control parameter can be at least one of pulse width, phase angle or switching frequency.

[0069] It should be understood that the higher the output power of the power conversion circuit, the higher the temperature of the power converter; conversely, the lower the output power of the power conversion circuit, the lower the temperature of the power converter. Therefore, this embodiment of the application determines whether it is necessary to control the output power of the power conversion circuit by comparing the magnitude of the first temperature collected by N temperature acquisition devices with a preset temperature range. When the first temperature collected by the N temperature acquisition devices is not within the preset temperature range, it indicates that the temperature of the power converter exceeds or falls below the normal operating temperature range. In this case, a first control parameter can be determined based on the N first temperatures, and then the output power of the power conversion circuit can be adjusted from the current output power to the first output power based on the first control parameter.

[0070] As an example, suppose there are two temperature acquisition devices, acquiring temperatures T1 and T2 respectively, with a preset temperature range of 100℃~120℃; suppose temperature T1 is 110℃ and temperature T2 is 150℃. Since temperature T2 is greater than the maximum value of the preset temperature range (i.e., 120℃), the controller can determine a first control parameter based on T1 and T2, and then control the output power of the power conversion circuit to decrease to a first output power based on the first control parameter. This can reduce the temperature T1 and temperature T2, for example, temperature T1 from 110℃ to 100℃ and temperature T2 from 150℃ to 130℃.

[0071] As another example, suppose there are two temperature acquisition devices, acquiring temperatures T1 and T2 respectively, with a preset temperature range of 100℃~140℃; suppose temperature T1 is 100℃ and temperature T2 is 90℃, then since temperature T2 is less than the minimum value of the preset temperature range (i.e., 100℃), the controller can determine a first control parameter based on temperature T1 and temperature T2, and then control the output power of the power conversion circuit to increase to a first output power based on the first control parameter. This allows temperature T1 and temperature T2 to increase, for example, temperature T1 increases from 100℃ to 120℃, and temperature T2 increases from 90℃ to 95℃.

[0072] It should be understood that the embodiments of this application introduce temperature as part of power control to regulate the temperature of the power converter. On the one hand, when the first temperature exceeds the preset temperature range, the above method can reduce the probability of increased losses, shortened service life, or damage to the components of the power converter due to excessive temperature, thereby improving the safety and reliability of the power converter. On the other hand, when the first temperature is below the preset temperature range, the above method can be used to increase the output power of the power converter and optimize the output capability of the power converter while ensuring that the first temperature does not exceed the maximum value of the preset temperature range.

[0073] The controller 12 is configured to control the output power of the power conversion circuit 11 to remain unchanged at the first output power when the output power is the first output power and the second temperature collected by the N temperature acquisition devices is within a preset temperature range.

[0074] As an example, suppose there are two temperature acquisition devices, and the second temperatures acquired are T3 and T4, respectively, with a preset temperature range of 100℃~350℃; suppose temperature T3 is 150℃ and temperature T4 is 190℃, then since both temperature T3 and temperature T4 are within the preset temperature range, the output power of the power conversion circuit can be controlled to remain unchanged as the first output power.

[0075] It should be understood that after the output power reaches the first output power, the temperature of the power converter may fluctuate within a preset temperature range as the output power changes. In this case, a second temperature can be collected by N temperature acquisition devices, and the relationship between the second temperature collected by the N temperature acquisition devices and the preset temperature range can be compared to determine whether the temperature of the power converter is within the preset temperature range, and thus determine whether the output power of the power conversion circuit still needs to be controlled. When the second temperature collected by the N temperature acquisition devices is within the preset temperature range, it indicates that the temperature of the power converter is already within the normal operating temperature range when the output power is the first output power. At this time, the output power of the power conversion circuit can be controlled to remain unchanged at the first output power, thereby achieving precise adjustment of the output power to a certain extent and making the output power of the power converter the optimal power within the preset temperature range.

[0076] The controller 12 is configured to determine a second control parameter based on the N second temperatures when the output power is the first output power and the second temperatures collected by the N temperature acquisition devices are not within the preset temperature range, and to control the output power of the power conversion circuit 11 to be adjusted from the first output power to the second output power based on the second control parameter.

[0077] The second control parameter refers to the parameter used to adjust the output power of the power conversion circuit from the first output power to the second output power. In the embodiments of this application, the second control parameter is at least one of pulse width, phase angle, or switching frequency.

[0078] It should be understood that after the output power is the first output power, if the second temperature collected by the N temperature acquisition devices is still not within the preset temperature range, it indicates that the temperature when the output power of the power converter is the first output power is still outside or below the normal operating temperature range. At this time, the second control parameter can be determined based on the N second temperatures, and then the output power of the power conversion circuit can be adjusted from the first output power to the second output power based on the second control parameter.

[0079] As an example, suppose there are two temperature acquisition devices, and the second temperatures acquired are T3 and T4, respectively, with a preset temperature range of 100℃~120℃; suppose temperature T3 is 115℃ and temperature T4 is 130℃. Since temperature T4 is greater than the maximum value of the preset temperature range (i.e., 120℃), the controller can determine a second control parameter based on T3 and T4. Then, based on the second control parameter, the output power of the power conversion circuit is reduced from the first output power to the second output power, which can reduce the temperature T3 and temperature T4. For example, temperature T3 is reduced from 115℃ to 100℃, and temperature T4 is reduced from 130℃ to 120℃.

[0080] As another example, suppose there are two temperature acquisition devices, acquiring temperatures T3 and T4 respectively, with a preset temperature range of 100℃~140℃; suppose temperature T3 is 115℃ and temperature T4 is 95℃, then since temperature T4 is less than the minimum value of the preset temperature range (i.e., 100℃), the controller can determine a second control parameter based on temperature T3 and temperature T4, and then control the output power of the power conversion circuit to increase from the first output power to the second output power based on the first control parameter. This allows temperature T3 and temperature T4 to increase, for example, temperature T3 increases from 115℃ to 120℃, and temperature T4 increases from 95℃ to 100℃.

[0081] Thus, this embodiment of the application introduces temperature as a part of power control, and continues to monitor the temperature after the output power is adjusted. If the second temperature is not within the preset temperature range, a second control parameter is determined, and the output power of the power conversion circuit is further adjusted using the second control parameter, thereby achieving gradual adjustment of the power converter's temperature. On the one hand, if the second temperature exceeds the preset temperature range, the probability of increased losses, shortened lifespan, or damage to the power converter's components due to excessive temperature can be further reduced, improving the safety and reliability of the power converter. On the other hand, if the second temperature is below the preset temperature range, the output power of the power converter can be further increased based on the second temperature not exceeding the maximum value of the preset temperature range, optimizing the power converter's output capability.

[0082] The controller 12 is configured to adjust the output power of the power conversion circuit 11 based on the determination method of the first control parameter and the second control parameter until the temperature collected by the N temperature acquisition devices is within the preset temperature range.

[0083] It should be understood that if the temperatures collected by the N temperature acquisition devices are still not within the preset temperature range, new control parameters can be further determined in the same way as the determination of the first and second control parameters. The output power of the power conversion circuit can then be adjusted according to these new control parameters. This gradually adjusts the temperature of the power converter until the temperatures collected by the N temperature acquisition devices are controlled within the preset temperature range. This reduces the probability of increased wear, shortened lifespan, or damage to the power converter components due to excessive temperature, thus improving the safety and reliability of the power converter. Simultaneously, by incorporating temperature into the output power control process, the temperature of the power converter can be controlled, and the output power can be maximized when the temperature is within the preset temperature range, improving resource utilization.

[0084] It should be noted that, in the embodiments of this application, the control parameters (i.e., the first control parameter, the second control parameter, or the new control parameter) can be at least one of pulse width, phase angle, or switching frequency. In this way, the switching transistor in the power conversion circuit can be turned on and off according to the control parameters, thereby controlling the step size and interval time of the output power of the power conversion circuit, and realizing the active and flexible adjustment of the output power of the power converter.

[0085] It should be noted that switching transistors (such as common metal-oxide-semiconductor field-effect transistors MOSFETs and insulated-gate bipolar transistors IGBTs) control the current flow path in the power conversion circuit by turning them on and off, thereby generating and regulating the output power.

[0086] Pulse width modulation (PWM) refers to a control parameter that controls the on-time of a switching transistor by changing the duty cycle of the pulse signal (i.e., the ratio of the pulse high-level duration to the entire cycle time). A larger duty cycle results in a longer on-time for the switching transistor within one cycle. For example, assuming a PWM signal with a period of 10ms, a 50% duty cycle results in the transistor being on for 5ms and off for 5ms; a 70% duty cycle results in the transistor being on for 7ms and off for 3ms.

[0087] Phase angle (phase shift control) refers to the control parameter in multi-level power conversion circuits that controls the turn-on and turn-off times of switching transistors by changing the phase difference between the phase pulse signals of each phase. Pulse signals of different phases cause the turn-on times of each phase switching transistor to be staggered, thereby controlling the output voltage and current. As an example, in a full-bridge topology, changing the turn-on phase of the switching transistors in the left and right arms generates a phase-shift pulse; or, in a dual active full-bridge topology, changing the turn-on phase of the switching transistors in the left and right arms of both full-bridges generates two phase-shift pulses to control the output voltage and current. For example, a PWM cycle is 10ms, and the duty cycle of each switching transistor is 50%, i.e., 5ms on and 5ms off. When the upper transistor of the left arm turns on at 0ms and turns off at 5ms, and the lower transistor of the right arm turns on at 1ms and turns off at 6ms, a 1 / 10 phase-shift pulse is generated.

[0088] Switching frequency (e.g., pulse frequency modulation, PFM) refers to a control parameter that controls the on and off frequency of a switching transistor by changing the frequency of a pulse signal. The higher the frequency, the more times the switching transistor turns on and off per unit time. For example, when the pulse frequency increases from 10kHz to 20kHz, the number of times the switching transistor turns on and off per second increases from 10,000 to 20,000.

[0089] In this embodiment, by using temperature as a parameter in the output power control loop, the changes in the aforementioned control parameters (i.e., pulse width, phase angle, and switching frequency) can be precisely controlled, thereby achieving precise adjustment of the output power change step size and interval. For example, in PWM control, the magnitude of each duty cycle adjustment determines the output power change step size. If the duty cycle is only finely adjusted by 1% each time, the output power change step size is relatively small; if it is adjusted by 5% each time, the change step size is larger.

[0090] It should be noted that the time interval can be controlled by the control parameters, which in turn affects the smoothness of the output power change. For example, a longer interval will result in a relatively slow change in output power, while a shorter interval will result in a more rapid change. Therefore, different time intervals can be set according to different adjustment needs. For instance, in situations requiring precise adjustment of output power, a shorter interval can be set to achieve fast and accurate adjustment of output power.

[0091] Based on the power converter provided in the above embodiments, in one possible implementation, the controller 12 can also be configured to control the output power of the power conversion circuit to be zero when there is a temperature greater than the warning temperature threshold among the temperatures collected by the N temperature acquisition devices.

[0092] Warning temperature thresholds refer to the maximum temperature values ​​allowed by the power converter, such as 400℃, 600℃, 150℃, etc., without specific limitations.

[0093] It should be noted that the preset temperature range is the temperature range within which the power converter can operate normally, while the warning temperature is the maximum temperature value that the power converter can withstand. That is, in high-temperature environments, the power converter has a certain ability to withstand high-temperature operation; however, if the temperature of the power converter exceeds the high warning temperature threshold, it may cause damage to the power converter. Therefore, in this embodiment, when the temperature of the power converter exceeds the warning temperature threshold, the controller can control the output power of the power conversion circuit to zero, that is, control the power conversion circuit to a shutdown or standby state. This serves two purposes: firstly, it cools down the power converter; secondly, it protects the power converter, improving its safety and reliability.

[0094] Based on the power converter provided in the above embodiments, combined with Figure 2 As shown, this application embodiment provides a power converter 20, which may include: a power conversion circuit 11, a controller 12, N temperature acquisition devices 13 and N low-pass filter circuits 21. The N low-pass filter circuits 21 correspond one-to-one with the N temperature acquisition devices 13. The first end of each low-pass filter circuit 21 is connected to the corresponding temperature acquisition device 13, and the second end of each low-pass filter circuit 21 is connected to the controller 12.

[0095] It should be noted that the components identical to those in the embodiments of this application and those in the above embodiments use the same reference numerals as those in the above embodiments. For details on the connection relationships and explanations of the components identical to those in the embodiments of this application and those in the above embodiments, please refer to the above embodiments, which will not be repeated here.

[0096] A low-pass filter circuit is an electronic filter circuit that allows signals below the cutoff frequency to pass through while significantly attenuating signals above the cutoff frequency. Low-pass filter circuits typically consist of components such as resistors (R), capacitors (C), and inductors (L). Taking an RC low-pass filter circuit as an example, it consists of a resistor and a capacitor connected in series. The input signal is applied across the series circuit, and the output signal is taken from the capacitor. When the input signal frequency is low, the capacitive reactance of the capacitor is large, and most of the voltage drops across the capacitor, resulting in an output signal close to the input signal. Conversely, when the input signal frequency is high, the capacitive reactance of the capacitor decreases, and most of the voltage drops across the resistor, significantly reducing the amplitude of the output signal, thus achieving attenuation of high-frequency signals.

[0097] The cutoff frequency is an important parameter of a low-pass filter circuit. When the frequency of the input signal is equal to the cutoff frequency, the amplitude of the output signal drops to 0.707 times the amplitude of the input signal (i.e., -3dB).

[0098] The low-pass filter circuit 21 is used to perform low-pass filtering on the temperature data collected by the corresponding temperature acquisition device 13, and send the processed temperature data to the controller 12.

[0099] Temperature data refers to data collected by a temperature acquisition device, and it is generally an analog signal. An analog signal is a signal whose information parameters are continuous within a given range. Its amplitude, frequency, or phase changes continuously with time, and within a continuous time interval, the characteristic quantity representing the information can present any value at any instant.

[0100] It should be understood that the temperature acquisition device may be affected by electrical and ambient temperature factors when acquiring temperature, which may cause the acquired temperature data to contain high-frequency noise or interference signals. In order to ensure the quality and accuracy of temperature data, the embodiments of this application can use a low-pass filter circuit to filter high-frequency noise or interference signals to obtain purer temperature data.

[0101] Based on the power converter provided in the above embodiments, in one possible implementation, it is combined with... Figure 3 As shown, the power converter 30 may include: a power conversion circuit 11, a controller 12, N temperature acquisition devices 13, and an analog-to-digital converter 31. The first end of the analog-to-digital converter 31 is connected to the N temperature acquisition devices 13, and the second end of the analog-to-digital converter 31 is connected to the controller 12.

[0102] The analog-to-digital conversion circuit 31 is used to perform analog-to-digital conversion processing on the analog signals collected by the N temperature acquisition devices 13, and send the resulting N digital signals to the controller 12.

[0103] Analog-to-digital converter (ADC) refers to a circuit that converts analog signals into digital signals. ADCs can convert continuously changing analog signals (i.e., temperature data collected by a temperature acquisition device) into digital quantities that can be processed by a computer.

[0104] It should be noted that analog signals are easily affected by external noise and interference during transmission, leading to signal distortion. Digital signals, on the other hand, only have two states: high and low. As long as the interference does not exceed a certain threshold, it will not affect the correct identification of the signal.

[0105] In one possible implementation, the analog-to-digital conversion circuit can be a separate device, or it can be integrated inside the controller 12.

[0106] It should be understood that analog signals attenuate with increasing distance during transmission, requiring compensation by an amplifier. However, the amplifier introduces new noise. Therefore, in this embodiment, where the analog-to-digital conversion circuit is a separate device, it can convert analog signals into digital signals. These digital signals can then be encoded and error-corrected at the receiving end to detect and correct errors generated during transmission, thereby improving the reliability of signal transmission.

[0107] It should be understood that integrating the analog-to-digital conversion circuitry within the controller enables a high degree of system integration, reducing system size and power consumption while improving reliability and stability. Simultaneously, integrated design reduces the number of external components, lowering system cost and complexity. Furthermore, integrated chips can be manufactured in large batches at relatively lower costs.

[0108] Based on the power converter provided in the above embodiments, in one possible implementation, if the preset temperature range includes N first temperature ranges, the controller 12 can be configured to determine a first control parameter based on M first temperatures when there is a first temperature among the N first temperatures that is greater than the maximum value of the corresponding first temperature range, and to control the output power of the power conversion circuit 11 to be adjusted from the current output power to the first output power based on the first control parameter. Here, M is an integer greater than or equal to 1 and less than or equal to N, and M represents the number of first temperatures greater than the maximum value of the corresponding first preset temperature range.

[0109] It should be understood that, in the embodiments of this application, each temperature acquisition device has a corresponding first temperature range. The first temperature range is used as a criterion for determining whether the temperature acquired by its corresponding temperature acquisition device exceeds a threshold. The temperatures of each first temperature range may be the same or different, and no specific limitation is made here. As an example, assuming that the power converter includes 10 temperature acquisition devices, the preset temperature range may include 10 first preset temperature ranges, and there is a mapping relationship between each first preset temperature range and its corresponding temperature acquisition device.

[0110] It should be understood that, in this embodiment, a corresponding first preset temperature range can be set for each temperature acquisition device. Thus, the temperature acquired by each temperature acquisition device can be compared with the corresponding first preset temperature range. If the temperature acquired by any temperature acquisition device is greater than the maximum value of the corresponding first preset temperature range, it indicates that there are components inside the power converter whose temperature exceeds the normal operating temperature. In this case, to reduce the impact of temperature on the performance of the components, it is necessary to control the output power of the power conversion circuit to reduce its output, thereby improving the safety and reliability of the power converter. Simultaneously, by setting a corresponding first preset temperature range for each temperature acquisition device, the resource utilization rate of the power converter can be improved to a certain extent.

[0111] In one possible implementation, if among N first temperatures there exists a first temperature less than the minimum value of the corresponding first temperature range, and there is no first temperature greater than the maximum value of the corresponding first temperature range, a first control parameter can be determined based on K first temperatures, and the output power of the power conversion circuit 11 can be adjusted from the current output power to the first output power based on the first control parameter. Here, K is an integer greater than or equal to 1 and less than or equal to N, and K represents the number of first temperatures less than the maximum value of the corresponding first preset temperature range.

[0112] It should be understood that, in the embodiments of this application, if there is no first temperature greater than the maximum value of the corresponding first preset temperature range, and there is a first temperature less than the minimum value of the corresponding first preset temperature range, it indicates that the output power of the power converter can still be increased. Therefore, the first control parameter can be determined based on K first temperatures, and the output power of the power conversion circuit can be adjusted from the current output power to the first output power based on the first control parameter, which can improve the resource utilization of the power converter to a certain extent.

[0113] It should be noted that if among the N first temperatures there is a first temperature greater than the maximum value of the corresponding first preset temperature range (let's say first temperature A) and a first temperature less than the minimum value of the corresponding first preset temperature range (let's say first temperature B), then the controller can be configured to determine the first control parameter based on the first temperature A, and control the output power of the power conversion circuit to decrease from the current output power to the first output power based on the first control parameter. In this way, the safety and reliability of the power converter can be improved.

[0114] It should be noted that when the preset temperature range includes N first temperature ranges, this application embodiment takes the determination method of the first control parameter as an example for illustrative explanation. The determination method of the second control parameter or the new control parameter can refer to the determination method of the first control parameter, and will not be repeated here.

[0115] Based on the power converter provided in the above embodiments, in one possible implementation, if the preset temperature range is a second temperature range, the controller 12 can be configured to determine a first control parameter based on P first temperatures when there is a first temperature among N first temperatures that is greater than the maximum value of the second temperature range, and to control the output power of the power conversion circuit to be adjusted from the current output power to the first output power based on the first control parameter. Here, P is an integer greater than or equal to 1 and less than or equal to N, and P represents the number of first temperatures greater than the maximum value of the second temperature range.

[0116] It should be understood that, in the embodiments of this application, a second preset temperature range can be set based on the operating temperatures of multiple components. When there is a value greater than the maximum value of the second preset temperature range among the N first temperatures, it indicates that there are components in the power converter that exceed the operating temperature. In this case, in order to reduce the impact of temperature on the performance of the components, it is necessary to control the output power of the power conversion circuit to reduce the temperature, so as to improve the safety and reliability of the power converter.

[0117] In one possible implementation, if all N first temperatures are less than the minimum value of the second preset temperature range, the controller can determine a first control parameter based on the N first temperatures, and then control the output power of the power conversion circuit to increase from the current output power to the first output power based on the first control parameter. In this way, the resource utilization of the power converter can be improved to a certain extent.

[0118] It should be noted that when the preset temperature range is the second temperature range, this application embodiment uses the determination method of the first control parameter as an example for illustrative purposes. The determination method of the second control parameter or the new control parameter can refer to the determination method of the first control parameter, and will not be repeated here.

[0119] It should be noted that, in one possible implementation, the preset temperature range may include N first preset temperature ranges and one second preset temperature range. The controller 12 may also be configured to compare the N first temperatures with the N first preset temperature ranges and compare the N first temperatures with the second preset temperature range. If the first temperature is greater than at least one of the maximum value of the first preset temperature range or the maximum value of the second preset temperature range, a first control parameter is determined based on the first temperature, and then the output power of the power conversion circuit is reduced from the current output power to the first output power based on the first control parameter. Alternatively, the controller may compare the N first temperatures with the second preset temperature range and compare the N first temperatures with the second preset temperature range. If none of the N first temperatures are greater than the first preset temperature range or the second preset temperature range, and there is a first temperature less than at least one of the minimum value of the first preset temperature range or the minimum value of the second preset temperature range, a first control parameter is determined based on the first temperature, and then the output power of the power conversion circuit is increased from the current output power to the first output power based on the first control parameter.

[0120] It should be understood that by performing dual temperature checks on N first temperatures, the resource utilization rate of the power converter can be improved to a certain extent, while enhancing the safety and reliability of the power converter.

[0121] Based on the power converter provided in the above embodiments, the structure of the power converter is further described below in conjunction with the control process. Taking an inverter as an example, the DC side of the inverter is connected to the load, and the AC side of the inverter is connected to the power grid. It should be noted that in the following embodiments, one temperature acquisition device and two temperature acquisition devices are used as examples for illustration. For ease of distinction, the inverter includes an inverter circuit 41, a controller 42, N temperature acquisition devices 13, N low-pass filter circuits 21-1, and N analog-to-digital conversion circuits 31-1; wherein, one temperature acquisition device corresponds to the low-pass filter circuit 21-1 and the analog-to-digital conversion circuit 31-1, and the other temperature acquisition device corresponds to the low-pass filter circuit 21-2 and the analog-to-digital conversion circuit 31-2.

[0122] In one possible implementation, combining Figure 4a As shown, the inverter provided in this embodiment includes a temperature acquisition device, which is located inside the inverter circuit 41, and the temperature acquired by the temperature acquisition device is T1.

[0123] The electrical signal (i.e., analog signal) of temperature T1 acquired by the temperature acquisition device is transmitted to the controller 42 after passing through the low-pass filter circuit 21-1 and the analog-to-digital converter circuit 31-1. The controller 42 can obtain the value of temperature T1. Then, the controller 42 outputs a control signal according to the size of temperature T1 and the preset temperature range to control the output power of the inverter circuit 41 to increase, decrease or remain unchanged.

[0124] In this circuit, DC (e.g., 45V) is the output DC power supply of the photovoltaic cell array module. The inverter circuit converts the DC power supply into AC power at the power frequency (e.g., 230V) and then transmits it to the filter circuit. The filter circuit filters out the differential-mode high-frequency harmonic components and common-mode high-frequency harmonic components in the AC power supply before transmitting it to the power grid.

[0125] In one possible implementation, combining Figure 4b As shown, the inverter provided in this embodiment includes two temperature acquisition devices, which are located at different positions inside the inverter circuit 41. The temperatures acquired by the two temperature acquisition devices are T1 and T2, respectively.

[0126] The electrical signal (i.e., analog signal) of temperature T1 acquired by the temperature acquisition device is transmitted to the controller 42 after passing through the low-pass filter circuit 21-1 and the analog-to-digital converter circuit 31-1. The controller 42 can obtain the value of temperature T1. Similarly, the electrical signal (i.e., analog signal) of temperature T2 acquired by the temperature acquisition device is transmitted to the controller 42 after passing through the low-pass filter circuit 21-2 and the analog-to-digital converter circuit 31-2. The controller 42 can obtain the value of temperature T2. Then, the controller outputs a control signal based on the maximum value of temperature T1 and temperature T2 and the range between these values ​​and a preset temperature range. This control is then used to adjust the output power of the inverter circuit 41, causing it to increase, decrease, or remain constant.

[0127] It should be understood that, in the embodiments of this application, the analog-to-digital conversion circuit is an independent device. Therefore, the analog-to-digital conversion circuit can be designed to have higher accuracy and resolution to meet the application scenarios with high requirements for the accuracy of analog signal conversion. At the same time, as an independent device, the analog-to-digital conversion circuit can be optimized for its corresponding temperature acquisition device to provide better performance indicators, such as sampling rate and signal-to-noise ratio.

[0128] In one possible implementation, combining Figure 4c As shown, the inverter provided in this embodiment includes a temperature acquisition device, which is located inside the inverter circuit 41, and the temperature acquired by the temperature acquisition device is T1. The analog-to-digital conversion circuit 31 is integrated inside the controller 42.

[0129] The electrical signal (i.e., analog signal) of temperature T1 collected by the temperature acquisition device is processed by the low-pass filter circuit 21 and transmitted to the analog-to-digital converter circuit 31 inside the controller 42 for processing. The controller 42 can obtain the value of temperature T1. Then, the controller 42 outputs a control signal according to the size of temperature T1 and the preset temperature range to control the output power of the inverter circuit 41 to increase, decrease or remain unchanged.

[0130] In one possible implementation, combining Figure 4d As shown, the inverter provided in this embodiment includes two temperature acquisition devices, which are located at different positions inside the inverter circuit. The temperatures acquired by the two temperature acquisition devices are T1 and T2, respectively.

[0131] The electrical signal (i.e., analog signal) of temperature T1 collected by the temperature acquisition device is processed by the low-pass filter circuit 21-1 and then transmitted to the analog-to-digital converter circuit 31-1 inside the controller 42 for processing. The controller 42 can then obtain the value of temperature T1. Similarly, the electrical signal (i.e., analog signal) of temperature T2 collected by the temperature acquisition device is processed by the low-pass filter circuit 21-2 and then transmitted to the analog-to-digital converter circuit 31-2 inside the controller 42 for processing. The controller 42 can then obtain the value of temperature T2. Then, the controller outputs a control signal based on the maximum value of temperature T1 and temperature T2 and the range between these values ​​and a preset temperature range, thereby controlling the output power of the inverter circuit 41 to increase, decrease, or remain constant.

[0132] It should be understood that by integrating the analog-to-digital conversion circuit inside the controller, the number of external components can be reduced, circuit design can be simplified, and system complexity can be reduced. At the same time, integrating the analog-to-digital conversion circuit inside the controller can reduce the connection between components, thereby improving the system's reliability and anti-interference capability.

[0133] It should be noted that using only one temperature acquisition device reduces hardware costs and installation complexity, while also simplifying system design and reducing the complexity of data acquisition and processing.

[0134] It should be noted that using multiple temperature acquisition devices improves system reliability, meaning that if one acquisition device fails, another can continue operating. Furthermore, monitoring temperatures at multiple different locations provides more comprehensive data, making it suitable for scenarios requiring multi-point temperature monitoring.

[0135] Based on the power converter provided in the above embodiments, in one possible implementation, see [link to relevant documentation]. Figure 5 The figure is a schematic diagram of a power conversion circuit with a flyback circuit topology provided in an embodiment of this application, wherein the output power is positively correlated with the duty cycle of the pulse.

[0136] Combination Figure 5 As shown, taking the temperature collected by the temperature acquisition device as exceeding the preset temperature range and the control parameter as the pulse width (i.e., changing the pulse duty cycle) as an example, the process of adjusting the output power of the power converter provided in this application embodiment can be as follows:

[0137] Step 1: The temperature acquisition device Te1 converts the temperature data into an electrical signal Tsample through the low-pass filter circuit 51 and the analog-to-digital converter circuit 52, and transmits the electrical signal Tsample to the controller 53. The controller 53 adjusts the duty cycle of the pulse according to the temperature data to regulate the output power. For example, when the temperature data Ts0 exceeds the preset temperature range, the duty cycle of the pulse is reduced to D1 to reduce the output power to P1, and the temperature decreases from Ts0 to Ts1.

[0138] Step 2: New temperature data is acquired through the temperature acquisition device Te1, and converted into a new electrical signal Tsample through the low-pass filter circuit 51 and the analog-to-digital converter circuit 52. The new electrical signal Tsample is then transmitted to the controller 53. The controller 53 adjusts the duty cycle of the pulse according to the new temperature data to regulate the output power. For example, when the temperature data Ts1 exceeds the preset temperature range, the duty cycle of the pulse is reduced to D2 to reduce the output power to P2, and the temperature decreases from Ts1 to Ts2.

[0139] Step 3: If the temperature Ts2 still exceeds the preset temperature range, repeat step 2 until the duty cycle Dn corresponds to Pn, so that the temperature Tsn is within the preset temperature range. At this time, control the duty cycle to Dn.

[0140] It should be understood that, in the embodiments of this application, the adjustment rate of the pulse duty cycle depends on the sampling rate of the temperature acquisition device Te1.

[0141] Specifically, when the temperature data is below the preset temperature range, the pulse duty cycle adjustment process is reversed as described above to increase output power. When the temperature data is within the preset temperature range, the pulse duty cycle is kept constant to maintain output power.

[0142] Based on the power converter provided in the above embodiments, in one possible implementation, see [link to relevant documentation]. Figure 6 The figure is a schematic diagram of a power conversion circuit with an LLC circuit topology provided in an embodiment of this application. The output power of the LLC circuit topology when it is operating in the inductive range is negatively correlated with the frequency of the pulse.

[0143] Combination Figure 6As shown, taking the temperature collected by the temperature acquisition device as exceeding the preset temperature range and the control parameter as the switching frequency (i.e., changing the frequency of the pulse) as an example, the process of adjusting the output power of the power converter provided in this application embodiment can be as follows:

[0144] Step 1: The temperature acquisition device Te2 converts the temperature data into an electrical signal Tsample through a low-pass filter circuit 61 and an analog-to-digital converter circuit 62, and transmits the electrical signal Tsample to the controller 63. The controller 63 adjusts the pulse frequency according to the temperature data to regulate the output power. For example, when the temperature Ts0 exceeds the preset temperature range, the pulse frequency is increased to f1 to reduce the output power to P1, and the temperature decreases from Ts0 to Ts1.

[0145] Step 2: The temperature acquisition device Te2 converts the new temperature data into a new electrical signal Tsample through the low-pass filter circuit 61 and the analog-to-digital converter circuit 62, and transmits the new electrical signal Tsample to the controller 63. The controller 63 adjusts the pulse frequency according to the new temperature data to regulate the output power. For example, when the temperature Ts1 exceeds the preset temperature range, the pulse frequency is increased to f2 to reduce the output power to P2, and the temperature decreases from Ts1 to Ts2.

[0146] Step 3: If the temperature Ts2 still exceeds the preset temperature range, repeat step 2 until Pn corresponding to fn is reached, so that the temperature Tsn is within the preset temperature range. At this time, the frequency is controlled to fn.

[0147] It should be understood that, in the embodiments of this application, the adjustment rate of the pulse frequency depends on the sampling rate of the temperature acquisition device Te2.

[0148] Specifically, when the temperature data is below the preset temperature range, the pulse frequency adjustment process is reversed to increase the output power. When the temperature data is within the preset temperature range, the pulse frequency is kept constant to maintain the output power.

[0149] Based on the power converter provided in the above embodiments, in one possible implementation, it is combined with... Figure 7 As shown, this application also provides a power supply system 70, which may include the power converter as described in any of the above embodiments.

[0150] In one possible implementation, when the power supply system is a photovoltaic system, the photovoltaic cell array module (PV source) converts solar energy into direct current (e.g., 45V) similar to a battery through the photovoltaic effect and outputs it to the inverter. The inverter then converts the direct current output by the photovoltaic cell array module into industrial frequency alternating current (e.g., 230V) and outputs it to the grid and users.

[0151] The inverter can have one or more photovoltaic (PV) array components as inputs. The AC outputs of the inverters are connected in parallel to increase the output power level and meet greater load demands. It should be noted that, in this embodiment, each inverter is exemplarily shown to be matched with one PV array component. Matching each inverter with multiple PV array components is also one possible implementation method of this application, and is not specifically limited here.

[0152] Based on the power converter provided in the above embodiments, in one possible implementation, the power converter of this application embodiment may include, but is not limited to, a micro inverter, a medium-sized inverter, a micro DC-DC converter, a medium-sized DC-DC converter, a micro rectifier, a medium-sized rectifier, etc., and is not specifically limited here.

[0153] Based on the power converter provided in the above embodiments, this application also provides a control method for the power converter, see [link to relevant documentation]. Figure 8 This figure is a schematic flowchart of the control method for the power converter provided in an embodiment of this application, combined with... Figure 8 As shown, the control method for the power converter provided in this application embodiment can be applied to the power converter described in any of the above embodiments. This control method may include:

[0154] S81: Obtain the first temperature collected by the N temperature acquisition devices of the power converter.

[0155] S82: If the first temperature collected by the N temperature acquisition devices is not within the preset temperature range, determine the first control parameter based on the N first temperatures, and adjust the output power of the power conversion circuit of the power converter from the current output power to the first output power based on the first control parameter.

[0156] S83: When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is within the preset temperature range, the output power of the control power conversion circuit remains unchanged at the first output power.

[0157] S84: When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is not within the preset temperature range, determine the second control parameter based on the N second temperatures, and adjust the output power of the power conversion circuit from the first output power to the second output power based on the second control parameter.

[0158] S85: Based on the determination method of the first control parameter and the second control parameter, adjust the output power of the power conversion circuit until the temperature collected by the N temperature acquisition devices is within the preset temperature range.

[0159] The first control parameter is at least one of pulse width, phase angle, or switching frequency; the second control parameter is at least one of pulse width, phase angle, or switching frequency.

[0160] In one possible implementation, the preset temperature range includes N first temperature ranges, and step S82 includes:

[0161] If there is a first temperature among N first temperatures that is greater than the maximum value of the corresponding first temperature range, a first control parameter is determined based on M first temperatures, and the output power of the power conversion circuit is adjusted from the current output power to the first output power based on the first control parameter; where M is an integer greater than or equal to 1 and less than or equal to N, and M represents the number of first temperatures that are greater than the maximum value of the corresponding first preset temperature range.

[0162] In one possible implementation, the preset temperature range is a second temperature range, and step S82 includes:

[0163] If there is a first temperature among N first temperatures that is greater than the maximum value of the second temperature range, a first control parameter is determined based on P first temperatures, and the output power of the power conversion circuit is adjusted from the current output power to the first output power based on the first control parameter; where P is an integer greater than or equal to 1 and less than or equal to N, and P represents the number of first temperatures that are greater than the maximum value of the second temperature range.

[0164] In one possible implementation, the method further includes: when there is a temperature among the temperatures collected by N temperature acquisition devices that is greater than a warning temperature threshold, the output power of the power conversion circuit is controlled to be zero.

[0165] The control method of the power converter provided in this application embodiment has the same beneficial effects as the power converter provided in the above embodiments, and therefore will not be described again.

[0166] In one possible implementation, combining Figure 9 As shown, assuming the temperature T1 is sampled by temperature acquisition device 1 and the temperature T2 is sampled by temperature acquisition device 2, the preset temperature range is T0, and the warning temperature threshold is Tk, then the control flow can be:

[0167] Step A: Use temperature acquisition device 1 and temperature acquisition device 2 to acquire temperatures T1 and T2.

[0168] Step B: Determine whether temperatures T1 and T2 exceed the warning temperature threshold. If temperatures T1 and T2 do not exceed the warning temperature threshold, proceed to step 3; if temperatures T1 and T2 exceed the warning temperature threshold, control the power converter to shut down.

[0169] Step C: Determine whether temperatures T1 and T2 exceed the preset temperature range T0; if temperatures T1 and T2 exceed the preset temperature range T0, proceed to step 4; if temperatures T1 and T2 do not exceed the preset temperature range T0, proceed to step 5.

[0170] Step D: Determine the control parameters based on temperatures T1 and T2, and reduce the output power of the power conversion circuit according to the control parameters.

[0171] Step E: Determine whether temperatures T1 and T2 are less than the preset temperature range T0; if temperatures T1 and T2 are less than the preset temperature range T0, proceed to step 6; if temperatures T1 and T2 are within the preset temperature range T0, proceed to step 7.

[0172] Step F: Determine the control parameters based on temperatures T1 and T2, and increase the output power of the power conversion circuit according to the control parameters.

[0173] Step G: Keep the output power of the control power conversion circuit constant.

[0174] In this embodiment, the higher the output power of the power conversion circuit, the higher the temperature of the power converter. Thus, by comparing the temperatures collected by N temperature acquisition devices with a preset temperature range, it is determined whether the output power of the power conversion circuit needs to be controlled. If the temperatures collected by the N temperature acquisition devices are not within the preset temperature range, corresponding control parameters are determined based on the N temperatures, and the output power of the power conversion circuit is adjusted according to the control parameters. This achieves gradual adjustment of the power converter temperature, reduces the probability of increased wear, shortened service life, or damage to the components of the power converter due to excessive temperature, and improves the safety and reliability of the power converter.

[0175] In one possible implementation, see Figure 10 The figure is a schematic diagram of a control device provided in an embodiment of this application.

[0176] The control device may include a memory 1011 and a processor 1012. The processor 1012 may be connected to a power converter. Figure 10 As shown, the memory can be random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (Electronic Programmable ROM), registers, hard disks, removable disks, etc.

[0177] The memory 1011 can store computer instructions. When the computer instructions stored in the memory 1011 are executed by the processor 1012, the processor 1012 can be used to execute the control method of the power converter. The memory 1011 can also store data, such as preset temperature ranges, warning temperature thresholds, and other information involved in the above embodiments.

[0178] 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)).

[0179] This application also provides a readable storage medium for storing the methods provided in the above embodiments. Examples include random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (EPROM), registers, hard disks, removable disks, or any other form of storage medium in the art.

[0180] In the embodiments of this application, the terms "first" and "second" (if they exist) are used only as name identifiers and do not represent the order of first and second.

[0181] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Regarding the methods disclosed in the embodiments, since they correspond to the product embodiments disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the description of the product embodiments.

[0182] 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 power converter, characterized in that, include: The power converter includes a power conversion circuit, a controller, and N temperature acquisition devices, wherein the N temperature acquisition devices are located inside the power converter, and N is an integer greater than or equal to 1. The controller is configured to determine a first control parameter based on the N first temperatures when the first temperatures collected by the N temperature acquisition devices are not within a preset temperature range, and to control the output power of the power conversion circuit to be adjusted from the current output power to the first output power based on the first control parameter. When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is within the preset temperature range, the output power of the power conversion circuit is controlled to remain unchanged at the first output power. When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is not within the preset temperature range, a second control parameter is determined based on the N second temperatures, and the output power of the power conversion circuit is adjusted from the first output power to the second output power based on the second control parameter. Based on the determination method of the first control parameter and the second control parameter, the output power of the power conversion circuit is adjusted until the temperature collected by the N temperature acquisition devices is within the preset temperature range. Wherein, the first control parameter is at least one of pulse width, phase angle, or switching frequency; the second control parameter is at least one of pulse width, phase angle, or switching frequency.

2. The power converter according to claim 1, characterized in that, The preset temperature range includes N first temperature ranges. The controller is configured to determine the first control parameter based on M first temperatures when there is a first temperature among the N first temperatures that is greater than the maximum value of the corresponding first temperature range, and to control the output power of the power conversion circuit to be adjusted from the current output power to the first output power based on the first control parameter; wherein, M is an integer greater than or equal to 1 and less than or equal to N, and M represents the number of first temperatures that are greater than the maximum value of the corresponding first preset temperature range.

3. The power converter according to claim 1, characterized in that, The preset temperature range is a second temperature range. The controller is configured to determine the first control parameter based on P first temperatures when there is a first temperature among N first temperatures that is greater than the maximum value of the second temperature range, and to control the output power of the power conversion circuit to be adjusted from the current output power to the first output power based on the first control parameter; wherein, P is an integer greater than or equal to 1 and less than or equal to N, and P represents the number of first temperatures that are greater than the maximum value of the second temperature range.

4. The power converter according to claim 1, characterized in that, The controller is further configured to control the output power of the power conversion circuit to zero if any of the temperatures collected by the N temperature acquisition devices exceeds a warning temperature threshold.

5. The power converter according to any one of claims 1-4, characterized in that, The power converter further includes: N low-pass filter circuits, each of the N low-pass filter circuits corresponding to one of the N temperature acquisition devices, with the first end of each low-pass filter circuit connected to the corresponding temperature acquisition device, and the second end of each low-pass filter circuit connected to the controller. The low-pass filter circuit is used to perform low-pass filtering on the temperature data collected by the corresponding temperature acquisition device, and send the processed temperature data to the controller.

6. The power converter according to any one of claims 1-4, characterized in that, The power converter further includes: an analog-to-digital converter circuit, the first terminal of which is connected to N temperature acquisition devices, and the second terminal of which is connected to the controller; The analog-to-digital conversion circuit is used to perform analog-to-digital conversion processing on the analog signals collected by the N temperature acquisition devices, and send the resulting N digital signals to the controller.

7. The power converter according to claim 6, characterized in that, The analog-to-digital conversion circuit is integrated inside the controller.

8. A micro inverter, characterized in that, The micro inverter includes an inverter circuit, a first controller, and N temperature acquisition devices, wherein the N temperature acquisition devices are disposed inside the power converter, and N is an integer greater than or equal to 1. The first controller is configured to determine a first control parameter based on the N first temperatures when the first temperatures collected by the N temperature acquisition devices are not within a preset temperature range, and to control the output power of the power conversion circuit to be adjusted from the current output power to the first output power based on the first control parameter. When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is within the preset temperature range, the output power of the power conversion circuit is controlled to remain unchanged at the first output power. When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is not within the preset temperature range, a second control parameter is determined based on the N second temperatures, and the output power of the power conversion circuit is adjusted from the first output power to the second output power based on the second control parameter. Based on the determination method of the first control parameter and the second control parameter, the output power of the power conversion circuit is adjusted until the temperature collected by the N temperature acquisition devices is within the preset temperature range. Wherein, the first control parameter is at least one of pulse width, phase angle, or switching frequency; the second control parameter is at least one of pulse width, phase angle, or switching frequency.

9. A control method for a power converter, characterized in that, The method includes: Obtain the first temperature collected by N temperature acquisition devices of the power converter; If the first temperature collected by the N temperature acquisition devices is not within the preset temperature range, a first control parameter is determined based on the N first temperatures, and the output power of the power conversion circuit of the power converter is adjusted from the current output power to the first output power based on the first control parameter. When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is within the preset temperature range, the output power of the power conversion circuit is controlled to remain unchanged at the first output power. When the output power is the first output power and the second temperature collected by the N temperature acquisition devices is not within the preset temperature range, a second control parameter is determined based on the N second temperatures, and the output power of the power conversion circuit is adjusted from the first output power to the second output power based on the second control parameter. Based on the determination method of the first control parameter and the second control parameter, the output power of the power conversion circuit is adjusted until the temperature collected by the N temperature acquisition devices is within the preset temperature range. Wherein, the first control parameter is at least one of pulse width, phase angle, or switching frequency; the second control parameter is at least one of pulse width, phase angle, or switching frequency.

10. The control method for the power converter according to claim 9, characterized in that, The preset temperature range includes N first temperature ranges. When the first temperatures collected by the N temperature acquisition devices are not within the preset temperature range, determining a first control parameter based on the N first temperatures, and controlling the output power of the power converter's power conversion circuit to adjust from the current output power to the first output power based on the first control parameter, includes: If, among N first temperatures, there is a first temperature greater than the maximum value of the corresponding first temperature range, the first control parameter is determined based on M first temperatures, and the output power of the power conversion circuit is adjusted from the current output power to the first output power based on the first control parameter; wherein, M is an integer greater than or equal to 1 and less than or equal to N, and M represents the number of first temperatures greater than the maximum value of the corresponding first preset temperature range.

11. The control method for the power converter according to claim 9, characterized in that, The preset temperature range is a second temperature range. When the first temperatures collected by the N temperature acquisition devices are not within the preset temperature range, determining a first control parameter based on the N first temperatures, and controlling the output power of the power converter's power conversion circuit to adjust from the current output power to the first output power based on the first control parameter, includes: If there is a first temperature among N first temperatures that is greater than the maximum value of the second temperature range, the first control parameter is determined based on P first temperatures, and the output power of the power conversion circuit is adjusted from the current output power to the first output power based on the first control parameter; wherein, P is an integer greater than or equal to 1 and less than or equal to N, and P represents the number of first temperatures that are greater than the maximum value of the second temperature range.

12. The control method for the power converter according to claim 9, characterized in that, The method further includes: If any of the temperatures collected by the N temperature acquisition devices exceeds the warning temperature threshold, the output power of the power conversion circuit is controlled to be zero.

13. A power supply system, characterized in that, The power supply system includes the power converter as described in claims 1-7, or the micro inverter as described in claim 8.

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