Power device control method and control system

Abstract

The present application relates to a control method and control system for a power device. The method comprises: obtaining the output current, device temperature and carrier frequency of the PWM control signal of the power device in real time; controlling the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current and the device temperature; performing dual-loop PID regulation on the PWM control signal based on the preset carrier frequency, the preset target temperature and the preset target current, controlling the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency to adjust the device temperature of the power device. The method is adopted to realize the precise dynamic adaptive regulation of the carrier frequency of the input signal of the power device, protect the stable operation of the power device under different temperature conditions, and improve the reliability of the power device.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a control method and a control system for a power device. Background Art

[0002] Power devices are widely used in new energy applications. Their heat generation significantly impacts device stability and lifespan. Heat dissipation is often a key component of thermal management. By designing the heat sink structure and cooling methods, device heat dissipation capacity can be enhanced, ultimately improving reliability and extending lifespan.

[0003] Heat dissipation-based thermal management aims to enhance heat dissipation capabilities and thereby limit device temperatures. While this method can improve the safety of power device operation, it still suffers from numerous shortcomings. First, it cannot fundamentally alleviate device heating issues. In harsh environments, when the cooling system struggles to function properly, device heat cannot be released, causing damage. Second, device lifespan is closely related to junction temperature fluctuations during device operation. Heat dissipation-based thermal management technology cannot adjust for these junction temperature fluctuations, thus providing limited benefits for device lifespan. Third, heat sink design is often unpredictable, requiring a certain margin. Furthermore, heat sinks are bulky and heavy, hindering system integration and miniaturization.

[0004] In addition, the carrier frequency of traditional PWM control is usually fixed when facing different operating temperatures, which may cause power devices to overheat in high temperature environments and affect the normal operation of the equipment. Summary of the Invention

[0005] Based on this, it is necessary to provide a power device control method and control system that can dynamically adjust the PWN control signal carrier frequency according to the output current and device temperature of the power device to enable the power device to operate below a safe device temperature to address the above technical problems.

[0006] In a first aspect, the present application provides a method for controlling a power device, the method comprising:

[0007] Real-time acquisition of power device output current, device temperature, and carrier frequency of PWM control signals;

[0008] Controlling the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current and the device temperature;

[0009] Based on the preset carrier frequency, preset target temperature, and preset target current, the PWM control signal is subjected to dual-loop PID regulation to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency, so as to adjust the device temperature of the power device.

[0010] In one embodiment, controlling the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current, and the device temperature includes:

[0011] Comparing the output current with a preset current value to obtain a current comparison result;

[0012] Comparing the device temperature with a preset temperature value to obtain a temperature comparison result;

[0013] The carrier frequency of the PWM control signal is controlled to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result.

[0014] In one embodiment, the preset carrier frequency includes a first set frequency, a second set frequency, and a third set frequency, the first set frequency is greater than the second set frequency, and the second set frequency is greater than the third set frequency; and controlling the carrier frequency of the PWM control signal to be adjusted to the preset carrier frequency based on the carrier frequency, the current comparison result, and the temperature comparison result includes:

[0015] If the carrier frequency of the PWM control signal is the first set frequency, and the device temperature is greater than or equal to a first preset temperature value,

[0016] Alternatively, if the carrier frequency of the PWM control signal is the first set frequency, and the output frequency of the output current is less than the first frequency value, and the output current is greater than the first preset current value,

[0017] The carrier frequency of the PWM control signal is controlled to be adjusted to the second set frequency.

[0018] In one embodiment, performing dual-loop PID regulation on the PWM control signal according to the preset carrier frequency and the preset target temperature to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency includes:

[0019] When the carrier frequency of the PWM control signal is adjusted to the second set frequency, if the device temperature is greater than the first preset temperature value and less than the second preset temperature value, dual-loop PID adjustment is performed on the PWM control signal according to the preset target temperature and the preset target current to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency;

[0020] If the device temperature is greater than the second preset temperature value, dual-loop PID adjustment is performed on the PWM control signal according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency.

[0021] In one embodiment, controlling the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result further includes:

[0022] If the carrier frequency of the PWM control signal is the first set frequency and the output current is greater than the second preset current value, the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency.

[0023] In one embodiment, performing dual-loop PID regulation on the PWM control signal according to the preset carrier frequency to control the carrier frequency of the PWM control signal to be adjusted to a target carrier frequency includes:

[0024] When the carrier frequency of the PWM control signal is adjusted to the third set frequency, if the device temperature is greater than a third preset temperature value and less than a fourth preset temperature value, dual-loop PID regulation is performed on the PWM control signal according to the preset target temperature and the preset target current to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency;

[0025] If the device temperature is equal to a third preset temperature value, a dual-loop PID adjustment is performed on the PWM control signal according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to a second set frequency.

[0026] In one embodiment, controlling the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result includes:

[0027] If the carrier frequency of the PWM control signal is the third set frequency and the output current is less than the third preset current value, the carrier frequency of the PWM control signal is controlled to be adjusted to the first set frequency.

[0028] In one embodiment, controlling the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result further includes:

[0029] If the carrier frequency of the PWM control signal is the second set frequency and the device temperature is lower than the third preset temperature value,

[0030] Alternatively, if the carrier frequency of the PWM control signal is the second set frequency, and the output frequency of the output current is greater than the second frequency value, or the output current is less than the fourth preset current value,

[0031] The carrier frequency of the PWM control signal is controlled to be adjusted to the first set frequency.

[0032] In one embodiment, performing dual-loop PID regulation on the PWM control signal to control the carrier frequency of the PWM control signal to adjust to a target carrier frequency includes:

[0033] When the carrier frequency of the PWM control signal is adjusted to the preset carrier frequency, the PWM control signal is subjected to temperature PID adjustment according to the current device temperature of the power device and the preset target temperature:

[0034] ;

[0035] Among them, f SW1 Indicates the first target frequency obtained by temperature PID adjustment, e T (t) = T ref -T represents the temperature error, T represents the current device temperature of the power device, T ref Indicates the preset target temperature of the power device, K PT Indicates the temperature adjustment proportional coefficient, K dT Represents the temperature regulation differential coefficient, K iT Indicates the temperature regulation integral coefficient;

[0036] According to the device current of the power device and the preset target current, the current PID adjustment is performed on the PWM control signal:

[0037] ;

[0038] Among them, f SW2 represents the second target frequency obtained by current PID regulation, e I (t) = I ref -I represents the current error, I represents the output current of the power device, I ref Indicates the preset target current of the power device, K PI Indicates the current regulation coefficient, K dI Indicates the current regulation differential coefficient, K iI Indicates the current regulation integral coefficient;

[0039] Determine the target carrier frequency of the PWM control signal:

[0040] ;

[0041] Among them, f SW Indicates the target carrier frequency of the PWM control signal.

[0042] In a second aspect, the present application further provides a control system for a power device, the system comprising a temperature detection module, a current monitoring module, and a frequency adjustment module.

[0043] The current monitoring module is used to obtain the output current of the power device at the current moment;

[0044] The temperature detection module is used to obtain the device temperature of the power device at the current moment;

[0045] The frequency adjustment module is used to obtain the carrier frequency of the PWM control signal of the power device at the current moment;

[0046] Controlling the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current and the device temperature;

[0047] According to the preset carrier frequency, a dual-loop PID adjustment is performed on the PWM control signal to control the carrier frequency of the PWM control signal to be adjusted to a target carrier frequency, so as to adjust the device temperature of the power device.

[0048] The above-mentioned control method and control system of the power device obtain the output current, device temperature and carrier frequency of the PWM control signal of the power device in real time; control the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current and the device temperature; and perform dual-loop PID regulation on the PWM control signal based on the preset carrier frequency, the preset target temperature and the preset target current to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency to adjust the device temperature of the power device, thereby realizing precise dynamic adaptive regulation of the carrier frequency of the input signal of the power device, protecting the stable operation of the power device under different temperature conditions, and improving the reliability of the power device. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 is a structural block diagram of a control system of a power device in one embodiment;

[0051] Figure 2 1 is a flow chart of a method for controlling a power device in one embodiment;

[0052] Figure 3 FIG. 1 is a flow chart of a method for controlling a power device in a preferred embodiment. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0054] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by persons of ordinary skill in the art to which this application belongs. The terms "a," "an," "an," "the," and similar expressions used herein do not denote quantitative limitations and may refer to either the singular or the plural. The terms "comprise," "include," "have," and any variations thereof, used herein, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or modules (units) is not limited to the listed steps or units but may also include steps or units not listed, or may include other steps or units inherent to the process, method, product, or apparatus. The terms "connected," "connected," "coupled," and similar expressions used herein are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. As used herein, "plurality" means two or more. "And / or" describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" may mean: A exists alone; A and B exist simultaneously; or B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0055] The power device control method provided in the embodiment of the present application can be applied to Figure 1 In the control system of the power device shown in FIG. , the system includes a temperature detection module 10, a current monitoring module 20, and a frequency adjustment module 30. The temperature detection module 10 and the current monitoring module 20 are connected to the frequency adjustment module 30, respectively.

[0056] The temperature detection module 10 is used to obtain the current device temperature of the power device.

[0057] The current monitoring module 20 is used to obtain the output current of the power device at the current moment.

[0058] The frequency adjustment module 30 is used to obtain the carrier frequency of the PWM control signal of the power device at the current moment; control the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency based on the carrier frequency, the output current and the device temperature; and perform dual-loop PID adjustment on the PWM control signal based on the preset carrier frequency to control the carrier frequency of the PWM control signal to be adjusted to a target carrier frequency to adjust the device temperature of the power device.

[0059] The current monitoring module 20 includes but is not limited to various temperature sensors.

[0060] In an exemplary embodiment, Figure 2 As shown, a control method for a power device is provided, which is applied to Figure 1 The system in is taken as an example to illustrate, including the following steps 201 to 203.

[0061] Step 201 : Acquire the output current of the power device, the device temperature, and the carrier frequency of the PWM control signal in real time.

[0062] The PWM control signal is an input signal of the power device.

[0063] Step 202 : Control the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current, and the device temperature.

[0064] The preset carrier frequency includes at least three frequency settings, namely, a first set frequency, a second set frequency, and a third set frequency. The first set frequency is greater than the second set frequency, which is greater than the third set frequency. The first set frequency is set as the default carrier frequency value of the power device.

[0065] Specifically, when the power device is initialized, the carrier frequency of the PWM control signal controlling the power device is adjusted to a default carrier frequency value, namely a first set frequency. As the power device operates, the device temperature continuously increases, and the output current and output frequency continuously change. If it is detected that the device temperature or output current does not meet the safe operating conditions of the power device, the carrier frequency of the PWM control signal is first directly adjusted from the first set frequency to the second set frequency or the third set frequency. This allows for rapid carrier frequency adjustment while ensuring safe operation of the power device, thereby preventing damage to the power device.

[0066] Preferably, during the operation of the power device, the carrier frequency of the PWM control signal is adjusted to the second set frequency. If it is detected that the device temperature or output current meets the efficient working conditions of the power device, the carrier frequency of the PWM control signal can also be controlled to be directly adjusted from the second set frequency to the first set frequency.

[0067] Step 203 : Based on the preset carrier frequency, the preset target temperature, and the preset target current, dual-loop PID regulation is performed on the PWM control signal to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency, so as to adjust the device temperature of the power device.

[0068] Specifically, while ensuring that the power devices can operate safely, the PWM control signal is subjected to dual-loop PID adjustment according to the preset carrier frequency, preset target temperature, and preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the target carrier frequency to achieve precise adjustment of the carrier frequency.

[0069] Preferably, during the operation of the power device, the carrier frequency of the PWM control signal is adjusted to a second set frequency. If it is detected that the device temperature or the output current still does not meet the safe operating conditions of the power device, the PWM control signal is subjected to dual-loop PID adjustment according to the adjusted preset carrier frequency, preset target temperature, and preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the target carrier frequency, wherein the target carrier frequency is greater than the third set frequency and less than the second set frequency.

[0070] In the above-mentioned control method for a power device, the output current, device temperature, and carrier frequency of a PWM control signal of the power device are acquired in real time; the carrier frequency of the PWM control signal of the power device is controlled to be adjusted to a preset carrier frequency according to the carrier frequency, the output current, and the device temperature; and dual-loop PID regulation is performed on the PWM control signal based on the preset carrier frequency, the preset target temperature, and the preset target current, so as to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency to adjust the device temperature of the power device, thereby realizing precise dynamic adaptive regulation of the carrier frequency of the input signal of the power device, protecting the stable operation of the power device under different temperature conditions, and improving the reliability of the power device.

[0071] In an exemplary embodiment, Figure 3 As shown, step 202 controls the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current and the device temperature, and specifically includes the following steps 301 to 303.

[0072] Step 301: Compare the output current with a preset current value to obtain a current comparison result.

[0073] The preset current value includes at least four current values, namely, a first preset current value, a second preset current value, a third preset current value, and a fourth preset current value.

[0074] Specifically, the output current is compared with various preset current values ​​to determine the current value interval in which the output current is located.

[0075] In detail, the first preset current value is 80% of the rated current value of the power device. When the output current of the power device exceeds the first preset current value, it indicates that the power device is in a heavy load operating condition. At this time, the device temperature may still be within a safe range, but the carrier frequency of the PWM control signal needs to be adjusted to a smaller preset carrier frequency, that is, the second set frequency.

[0076] The second preset current value is 140% of the rated current value of the power device. When the output current of the power device exceeds the second preset current value, it indicates that the power device is in an overloaded operating condition. Under this condition, the power device may generate severe heat and the temperature of the equipment increases. Therefore, it is necessary to adjust the carrier frequency of the PWM control signal to the minimum preset carrier frequency, that is, the third set frequency.

[0077] The third preset current value is 120% of the rated current value of the power device, which serves as a hysteresis control condition for the PWM control signal. When the PWM control signal of the power device is at the third set frequency and the output current is less than the third preset current value, the PWM control signal will be controlled to be directly adjusted from the third set frequency to the first set frequency.

[0078] The fourth preset current value is 70% of the rated current value of the power device. When the output current of the power device is less than the fourth preset current value, it indicates that the power device is operating in a light load condition. Under this condition, the temperature rise range that the power device can withstand is large, so it is necessary to adjust the carrier frequency of the PWM control signal to the maximum preset carrier frequency, that is, the first set frequency.

[0079] Step 302: Compare the device temperature with a preset temperature value to obtain a temperature comparison result.

[0080] The preset temperature values ​​include at least four temperature values, such as a first preset temperature value, a second preset temperature value, a third preset temperature value, and a fourth preset temperature value. The second preset temperature value is greater than the fourth preset temperature value, which is greater than the first preset temperature value, which is greater than the third preset temperature value.

[0081] Specifically, the device temperature is compared with various preset temperature values ​​to determine the temperature value range in which the device temperature lies.

[0082] In detail, when the device temperature is lower than the first preset temperature value or the third preset temperature value, it indicates that the device temperature of the power device is lower and can operate at a higher preset carrier frequency. Therefore, the carrier frequency of the PWM control signal needs to be directly adjusted to the maximum preset carrier frequency, i.e., the first set frequency.

[0083] When the device temperature is greater than or equal to the first preset temperature value and less than the second preset temperature value, it means that the device temperature of the power device is gradually increasing. It is necessary to directly adjust the carrier frequency of the PWM control signal to a smaller preset carrier frequency, that is, the second set frequency, and then use the dual-loop PID to adjust the target carrier frequency.

[0084] When the device temperature is greater than or equal to the second preset temperature value, it indicates that the device temperature of the power device is too high. Since the carrier frequency of the PWM control signal has been directly adjusted to the second preset frequency during the process of the device temperature rising to exceed the second preset temperature value, it is only necessary to use the dual-loop PID to adjust it to the minimum third preset frequency. If the device temperature is greater than the second preset temperature value for more than the preset time, and the carrier frequency of the PWM control signal is not adjusted to the third preset frequency, the power device will issue an adjustment failure warning. If the carrier frequency of the PWM control signal is adjusted to the third preset frequency, the device temperature gradually decreases. When the decrease range is between the fourth preset temperature value and the second preset temperature value, the power device still operates at the third preset frequency until the device temperature is less than the fourth preset temperature value.

[0085] When the device temperature drops to a value greater than or equal to the third preset temperature value and less than the fourth preset temperature value, it indicates that the device temperature of the power device has returned to normal, and the carrier frequency of the PWM control signal has returned to the state of adaptive adjustment, and the dual-loop PID can be used to adjust the target carrier frequency.

[0086] Step 303 : Control the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result.

[0087] In this embodiment, the direct adjustment result of the carrier frequency of the PWM control signal is determined by comparing the output current and the device temperature, thereby achieving fast and safe adjustment of the PWM control signal and ensuring safe and efficient operation of the power device.

[0088] In one embodiment, step 303 of controlling the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result specifically includes the following:

[0089] If the carrier frequency of the PWM control signal is the first set frequency and the device temperature is greater than or equal to a first preset temperature value, or if the carrier frequency of the PWM control signal is the first set frequency and the output frequency of the output current is less than the first frequency value, and the output current is greater than the first preset current value, then the carrier frequency of the PWM control signal is controlled to be adjusted to the second set frequency.

[0090] Specifically, when the power device temperature is greater than a first preset temperature value at a first set frequency, or when the output frequency of the output current is less than the first frequency value and the current magnitude is greater than the first preset current value, indicating that the power device is generating a high amount of heat, the carrier frequency of the PWM control signal is directly adjusted from the first set frequency to a second set frequency. The first frequency value is 3 Hz.

[0091] In this embodiment, hysteresis control of the power device is achieved by directly adjusting the first set frequency to the second set frequency, thereby improving the accuracy and efficiency of carrier frequency adjustment.

[0092] Furthermore, step 203 performs dual-loop PID regulation on the PWM control signal according to the preset carrier frequency and the preset target temperature, and controls the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency, which specifically includes the following:

[0093] When the carrier frequency of the PWM control signal is adjusted to the second set frequency, if the device temperature is greater than the first preset temperature value and less than the second preset temperature value, dual-loop PID regulation is performed on the PWM control signal based on the preset target temperature and the preset target current to control the carrier frequency of the PWM control signal to the target carrier frequency. If the device temperature is greater than the second preset temperature value, dual-loop PID regulation is performed on the PWM control signal based on the preset target temperature and the preset target current to control the carrier frequency of the PWM control signal to the third set frequency.

[0094] Specifically, after the carrier frequency is directly adjusted from the first set frequency to the second set frequency, the device temperature is still greater than the first preset temperature value and less than the second preset temperature value. The operating condition of the second set frequency still has a large heat generation for the power device. Therefore, the PWM control signal is subjected to dual-loop PID regulation based on the preset target temperature and preset target current to control the carrier frequency of the PWM control signal to the target carrier frequency. However, if the device temperature is greater than the second preset temperature value after the carrier frequency is directly adjusted from the first set frequency to the second set frequency, then the target carrier frequency at this time is the third set frequency that provides the minimum operating condition. Dual-loop PID regulation is used to control the carrier frequency of the PWM control signal to the third set frequency.

[0095] In this embodiment, dual-loop PID regulation between the second set frequency and the target carrier frequency is implemented through the current comparison result and the temperature comparison result, thereby protecting the power devices from operating efficiently at a safe temperature.

[0096] In one embodiment, step 303 controls the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result, and specifically includes the following:

[0097] If the carrier frequency of the PWM control signal is the first set frequency and the output current is greater than the second preset current value, the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency.

[0098] Specifically, when the output current of the power device is greater than the second preset current value at the first set frequency, it means that the power device is overloaded. Therefore, the carrier frequency of the PWM control signal is directly adjusted from the first set frequency to the third set frequency to protect the equipment safety of the power device.

[0099] In this embodiment, the safety of the power device is protected by directly adjusting the first set frequency to the third set frequency.

[0100] Furthermore, step 203 performs dual-loop PID regulation on the PWM control signal according to the preset carrier frequency to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency, which specifically includes the following:

[0101] When the carrier frequency of the PWM control signal is adjusted to the third set frequency, if the device temperature is greater than a third preset temperature value and less than a fourth preset temperature value, dual-loop PID regulation is performed on the PWM control signal based on the preset target temperature and the preset target current to control the carrier frequency of the PWM control signal to the target carrier frequency. If the device temperature is equal to the third preset temperature value, dual-loop PID regulation is performed on the PWM control signal based on the preset target temperature and the preset target current to control the carrier frequency of the PWM control signal to the second set frequency.

[0102] Specifically, after the carrier frequency is directly adjusted from the first set frequency to the third set frequency, the device temperature gradually decreases. If the device temperature drops to a value greater than the third preset temperature but less than the fourth preset temperature, the operating conditions of the third set frequency are insufficient for the power device to achieve efficient operation. Therefore, dual-loop PID regulation is performed on the PWM control signal based on the preset target temperature and preset target current to control the carrier frequency of the PWM control signal to the target carrier frequency, thereby improving the operating efficiency of the power device. However, when the device temperature drops to the third preset temperature, the power device temperature already has a large safe fluctuation range, and the first set frequency only has direct adjustment conditions with the second and third set frequencies. Therefore, dual-loop PID regulation must be used to control the carrier frequency of the PWM control signal from the target carrier frequency to the second set frequency. If the device temperature continues to drop to less than the third preset temperature, the carrier frequency of the PWM control signal is directly adjusted from the second set frequency to the first set frequency.

[0103] In this embodiment, dual-loop PID regulation between the third set frequency and the target carrier frequency is realized through current comparison results and temperature comparison results, thereby achieving fast and accurate carrier frequency control and protecting power devices from operating efficiently at a safe temperature.

[0104] In one embodiment, step 303 controls the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result, and specifically includes the following:

[0105] If the carrier frequency of the PWM control signal is the third set frequency and the output current is less than the third preset current value, the carrier frequency of the PWM control signal is controlled to be adjusted to the first set frequency.

[0106] Specifically, when the output current of the power device is less than the third preset current value at the third set frequency, it means that the power device is fully operating under light load conditions. Therefore, the carrier frequency of the PWM control signal is directly adjusted from the third set frequency to the first set frequency.

[0107] In this embodiment, by directly adjusting the third set frequency to the first set frequency, rapid adjustment of the high-efficiency working condition of the power device is achieved, thereby improving the working efficiency of the power device.

[0108] In one embodiment, step 303 controls the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency according to the carrier frequency, the current comparison result, and the temperature comparison result, and specifically includes the following:

[0109] If the carrier frequency of the PWM control signal is the second set frequency and the device temperature is less than the third preset temperature value, or if the carrier frequency of the PWM control signal is the second set frequency and the output frequency of the output current is greater than the second power value or the output current is less than the fourth preset current value, the carrier frequency of the PWM control signal is controlled to be adjusted to the first set frequency.

[0110] Specifically, when the power device is at the second set frequency and the device temperature is less than a third preset temperature value, or the output frequency of the output current is greater than the second frequency value, or the output current is less than a fourth preset current value, it indicates that the power device is still in a low operating condition. Therefore, the carrier frequency of the PWM control signal is directly adjusted from the second set frequency to the first set frequency. The second frequency value is 5 Hz.

[0111] In this embodiment, hysteresis control of the power device is achieved by directly adjusting the second set frequency to the first set frequency, thereby improving the accuracy and efficiency of carrier frequency adjustment.

[0112] In one embodiment, the dual-loop PID regulation includes temperature PID regulation and current PID regulation. When the carrier frequency of the PWM control signal is adjusted to the second set frequency or the third set frequency:

[0113] ;

[0114] Among them, f SW1 Indicates the first target frequency obtained by temperature PID adjustment, e T (t) = T ref -T represents the temperature error, T represents the current device temperature of the power device, T ref Indicates the preset target temperature of the power device, K PT Indicates the temperature adjustment proportional coefficient, K dT Represents the temperature regulation differential coefficient, K iT Indicates the temperature regulation integral coefficient;

[0115] According to the device current of the power device and the preset target current, the current PID adjustment is performed on the PWM control signal:

[0116] ;

[0117] Among them, f SW2 represents the second target frequency obtained by current PID regulation, e I (t) = I ref -I represents the current error, I represents the output current of the power device, I refIndicates the preset target current of the power device, K PI Indicates the current regulation coefficient, K dI Indicates the current regulation differential coefficient, K iI Indicates the current regulation integral coefficient;

[0118] Determine the target carrier frequency of the PWM control signal:

[0119] ;

[0120] Among them, f SW Indicates the target carrier frequency of the PWM control signal.

[0121] In this embodiment, through current PID regulation, the carrier frequency is dynamically adjusted using the output current data to optimize the performance of the device under different current loads. Through temperature PID regulation, the carrier frequency is adjusted in combination with the device temperature feedback. By reducing the frequency, the heat generated by the switching loss of the power device is reduced. A dual-loop PID regulation of the carrier frequency between the second set frequency and the third set frequency is achieved to ensure efficient and safe operation of the power device.

[0122] In a preferred embodiment, a method for controlling a power device is provided, such as Figure 3 As shown, specifically including the following:

[0123] During system initialization, the carrier frequency of the PWM control signal is set to the default carrier frequency, i.e., the first set frequency a Hz. The second set frequency is set to b Hz, and the third set frequency is set to c Hz, where a>b>c. The first preset temperature is set to temp1, the second preset temperature is temp2, the third preset temperature is temp3, and the fourth preset temperature is temp4.

[0124] Real-time detection of the device temperature NTC of the power device, the output current Is, and the carrier frequency f of the PWM control signal.

[0125] When the carrier frequency f=a Hz and the device temperature NTC>temp1, or when the carrier frequency f=a Hz and the output frequency of the output current Is is less than 3 Hz, and the output current Is>80% of the rated current, directly adjust the carrier frequency f=b Hz of the PWM control signal.

[0126] When the carrier frequency f=b Hz and the device temperature temp1<NTC<temp2, the PWM control signal is adjusted by dual-loop PID according to the preset target temperature and the preset target current to control the carrier frequency f to the target carrier frequency d Hz, where c<d<b.

[0127] When the carrier frequency f=b Hz and the device temperature NTC>temp2, the dual-loop PID regulation is used to adjust the carrier frequency f=c Hz.

[0128] When the carrier frequency f=c Hz and the output current Is<120% of the rated current, the carrier frequency f=a Hz of the PWM control signal is directly adjusted.

[0129] When the carrier frequency f=c Hz and the device temperature temp3<NTC<temp4, the PWM control signal is subjected to dual-loop PID adjustment according to the preset target temperature and the preset target current to adjust the carrier frequency f=e Hz of the PWM control signal, where c<e<b.

[0130] When the carrier frequency f=c Hz and the device temperature NTC=temp3, the dual-loop PID regulation is used to adjust the carrier frequency f=b Hz of the PWM control signal.

[0131] When the carrier frequency f=b Hz and the device temperature NTC<temp3, the carrier frequency f=a Hz of the PWM control signal is directly adjusted.

[0132] When the carrier frequency f=b Hz and the output frequency of the output current Is is greater than 5 Hz, or the output current Is is less than 70% of the rated current, the carrier frequency f=a Hz of the PWM control signal is directly adjusted.

[0133] When the carrier frequency f=a Hz and the output current Is>140% of the rated current, the carrier frequency f=c Hz of the PWM control signal is directly adjusted.

[0134] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0135] In an exemplary embodiment, a power device is provided, such as Figure 1 The control system of the power device shown in the figure has a computer program stored in the memory of the power device, and the processor implements the following steps when executing the computer program:

[0136] Real-time acquisition of power device output current, device temperature, and carrier frequency of PWM control signals;

[0137] Controlling the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current and the device temperature;

[0138] Based on the preset carrier frequency, preset target temperature, and preset target current, the PWM control signal is subjected to dual-loop PID regulation to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency, so as to adjust the device temperature of the power device.

[0139] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0140] The output current is compared with a preset current value to obtain a current comparison result; the device temperature is compared with a preset temperature value to obtain a temperature comparison result; and the carrier frequency of the PWM control signal is controlled to be adjusted to a preset carrier frequency based on the carrier frequency, the current comparison result and the temperature comparison result.

[0141] In one embodiment, when the processor executes the computer program, the following steps are further implemented: if the carrier frequency of the PWM control signal is the first set frequency and the device temperature is greater than or equal to a first preset temperature value, or if the carrier frequency of the PWM control signal is the first set frequency and the output frequency of the output current is less than the first frequency value, and the output current is greater than the first preset current value, then the carrier frequency of the PWM control signal is controlled to be adjusted to the second set frequency.

[0142] In one embodiment, when the processor executes the computer program, the processor further implements the following steps: when the carrier frequency of the PWM control signal is adjusted to the second set frequency, if the device temperature is greater than the first preset temperature value and less than the second preset temperature value, performing dual-loop PID adjustment on the PWM control signal according to the preset target temperature and the preset target current, and controlling the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency;

[0143] If the device temperature is greater than the second preset temperature value, dual-loop PID adjustment is performed on the PWM control signal according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency.

[0144] In one embodiment, when the processor executes the computer program, it further implements the following steps: if the carrier frequency of the PWM control signal is the first set frequency and the output current is greater than the second preset current value, then the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency.

[0145] In one embodiment, when the processor executes the computer program, the processor further implements the following steps: when the carrier frequency of the PWM control signal is adjusted to the third set frequency, if the device temperature is greater than a third preset temperature value and less than a fourth preset temperature value, performing dual-loop PID adjustment on the PWM control signal according to the preset target temperature and the preset target current, and controlling the carrier frequency of the PWM control signal to be adjusted to a target carrier frequency;

[0146] If the device temperature is equal to a third preset temperature value, a dual-loop PID adjustment is performed on the PWM control signal according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to a second set frequency.

[0147] In one embodiment, when the processor executes the computer program, it further implements the following steps: if the carrier frequency of the PWM control signal is a third set frequency and the output current is less than the third preset current value, then the carrier frequency of the PWM control signal is controlled to be adjusted to the first set frequency.

[0148] In one embodiment, when the processor executes the computer program, the following steps are further implemented: if the carrier frequency of the PWM control signal is the second set frequency and the device temperature is less than the third preset temperature value, or if the carrier frequency of the PWM control signal is the second set frequency and the output frequency of the output current is greater than the second frequency value, or the output current is less than a fourth preset current value, then the carrier frequency of the PWM control signal is controlled to be adjusted to the first set frequency.

[0149] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0150] When the carrier frequency of the PWM control signal is adjusted to the preset carrier frequency, the PWM control signal is subjected to temperature PID adjustment according to the current device temperature of the power device and the preset target temperature:

[0151] ;

[0152] Among them, f SW1 Indicates the first target frequency obtained by temperature PID adjustment, e T (t) = T ref -T represents the temperature error, T represents the current device temperature of the power device, Tref Indicates the preset target temperature of the power device, K PT Indicates the temperature adjustment proportional coefficient, K dT Represents the temperature regulation differential coefficient, K iT Indicates the temperature regulation integral coefficient;

[0153] According to the device current of the power device and the preset target current, the current PID adjustment is performed on the PWM control signal:

[0154] ;

[0155] Among them, f SW2 represents the second target frequency obtained by current PID regulation, e I (t) = I ref -I represents the current error, I represents the output current of the power device, I ref Indicates the preset target current of the power device, K PI Indicates the current regulation coefficient, K dI Indicates the current regulation differential coefficient, K iI Indicates the current regulation integral coefficient;

[0156] Determine the target carrier frequency of the PWM control signal:

[0157] ;

[0158] Among them, f SW Indicates the target carrier frequency of the PWM control signal.

[0159] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps corresponding to the methods described in the above embodiments are implemented.

[0160] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps corresponding to the methods described in the above embodiments are implemented.

[0161] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, artificial intelligence (AI) processors, and the like.

[0162] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0163] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for controlling a power device, characterized in that: The method comprises: Obtain the output current of the power device, device temperature and carrier frequency of the PWM control signal in real time; According to the carrier frequency, the output current and the device temperature, the carrier frequency of the PWM control signal of the power device is controlled to be adjusted to a preset carrier frequency; the preset carrier frequency includes a first set frequency, a second set frequency and a third set frequency, the first set frequency is greater than the second set frequency, and the second set frequency is greater than the third set frequency; Based on the preset carrier frequency, the preset target temperature, and the preset target current, the PWM control signal is subjected to dual-loop PID regulation, and the carrier frequency of the PWM control signal is controlled to be adjusted to the target carrier frequency, so as to adjust the device temperature of the power device; including: If the carrier frequency of the PWM control signal is the first set frequency, and the device temperature is greater than or equal to the first preset temperature value, or if the carrier frequency of the PWM control signal is the first set frequency, and the output frequency of the output current is less than the first frequency value, and the output current is greater than the first preset current value, then the carrier frequency of the PWM control signal is controlled to be adjusted to the second set frequency; wherein, the output current being greater than the first preset current value indicates that the power device is in a heavy load operating condition; If the carrier frequency of the PWM control signal is the first set frequency, and the output current is greater than the second preset current value, the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency; wherein the output current being greater than the second preset current value indicates that the power device is in an overload operating condition; When the carrier frequency of the PWM control signal is adjusted to the second set frequency, if the device temperature is greater than the second preset temperature value, the PWM control signal is subjected to dual-loop PID adjustment according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency; When the carrier frequency of the PWM control signal is adjusted to the third set frequency, if the device temperature is greater than the third preset temperature value and less than the fourth preset temperature value, the PWM control signal is subjected to dual-loop PID regulation according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the target carrier frequency; if the device temperature is equal to the third preset temperature value, the PWM control signal is subjected to dual-loop PID regulation according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the second set frequency; Among them, the second preset temperature value is greater than the fourth preset temperature value, which is greater than the first preset temperature value, which is greater than the third preset temperature value.

2. The method for controlling a power device according to claim 1, characterized in that: The step of controlling the carrier frequency of the PWM control signal of the power device to be adjusted to a preset carrier frequency according to the carrier frequency, the output current and the device temperature comprises: Comparing the output current with a preset current value to obtain a current comparison result; Comparing the device temperature with a preset temperature value to obtain a temperature comparison result; According to the carrier frequency, the current comparison result and the temperature comparison result, the carrier frequency of the PWM control signal is controlled to be adjusted to a preset carrier frequency.

3. The method for controlling a power device according to claim 1, characterized in that: The step of performing dual-loop PID regulation on the PWM control signal according to the preset carrier frequency and the preset target temperature, and controlling the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency includes: When the carrier frequency of the PWM control signal is adjusted to the second set frequency, if the device temperature is greater than the first preset temperature value and less than the second preset temperature value, the PWM control signal is subjected to dual-loop PID adjustment according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the target carrier frequency.

4. The method for controlling a power device according to claim 2, characterized in that: According to the carrier frequency, the current comparison result and the temperature comparison result, controlling the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency comprises: If the carrier frequency of the PWM control signal is a third set frequency and the output current is less than a third preset current value, the carrier frequency of the PWM control signal is controlled to be adjusted to the first set frequency, wherein the third preset current value is 120% of the rated current value of the power device.

5. The method for controlling a power device according to claim 2, characterized in that: According to the carrier frequency, the current comparison result and the temperature comparison result, controlling the carrier frequency of the PWM control signal to be adjusted to a preset carrier frequency also includes: If the carrier frequency of the PWM control signal is the second set frequency, and the device temperature is less than the third preset temperature value, Alternatively, if the carrier frequency of the PWM control signal is the second set frequency, and the output frequency of the output current is greater than the second frequency value, or the output current is less than the fourth preset current value, The power device is in a light load operating condition, and the carrier frequency of the PWM control signal is controlled to be adjusted to the first set frequency.

6. The method for controlling a power device according to claim 1, characterized in that: The performing dual-loop PID regulation on the PWM control signal to control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency includes: When the carrier frequency of the PWM control signal is adjusted to the preset carrier frequency, the PWM control signal is subjected to temperature PID adjustment according to the current device temperature of the power device and the preset target temperature: ； Among them, f SW1 represents the first target frequency obtained by temperature PID regulation, e T (t) = T ref -T represents the temperature error, T represents the current device temperature of the power device, T ref represents the preset target temperature of the power device, K PT Indicates the temperature adjustment proportional coefficient, K dT represents the temperature regulation differential coefficient, K iT Indicates the temperature regulation integral coefficient; According to the device current of the power device and the preset target current, the current PID adjustment is performed on the PWM control signal: ； Among them, f SW2 represents the second target frequency obtained by current PID regulation, e I (t) = I ref -I represents the current error, I represents the output current of the power device, I ref represents the preset target current of the power device, K PI Indicates the current regulation proportional coefficient, K dI Represents the current regulation differential coefficient, K iI Indicates the current regulation integral coefficient; Determine the target carrier frequency of the PWM control signal: ； Among them, f SW Indicates the target carrier frequency of the PWM control signal.

7. A control system for a power device, characterized in that: The system includes a temperature detection module, a current monitoring module, and a frequency adjustment module. The current monitoring module is used to obtain the output current of the power device at the current moment; The temperature detection module is used to obtain the device temperature of the power device at the current moment; The frequency adjustment module is used to obtain the carrier frequency of the PWM control signal of the power device at the current moment; According to the carrier frequency, the output current and the device temperature, the carrier frequency of the PWM control signal of the power device is controlled to be adjusted to a preset carrier frequency; the preset carrier frequency includes a first set frequency, a second set frequency and a third set frequency, the first set frequency is greater than the second set frequency, and the second set frequency is greater than the third set frequency; The frequency adjustment module is further used to perform dual-loop PID adjustment on the PWM control signal based on the preset carrier frequency, the preset target temperature, and the preset target current, and control the carrier frequency of the PWM control signal to be adjusted to the target carrier frequency to adjust the device temperature of the power device; including: If the carrier frequency of the PWM control signal is the first set frequency, and the device temperature is greater than or equal to the first preset temperature value, or if the carrier frequency of the PWM control signal is the first set frequency, and the output frequency of the output current is less than the first frequency value, and the output current is greater than the first preset current value, then the carrier frequency of the PWM control signal is controlled to be adjusted to the second set frequency; wherein, the output current being greater than the first preset current value indicates that the power device is in a heavy load operating condition; If the carrier frequency of the PWM control signal is the first set frequency, and the output current is greater than the second preset current value, the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency; wherein the output current being greater than the second preset current value indicates that the power device is in an overload operating condition; When the carrier frequency of the PWM control signal is adjusted to the second set frequency, if the device temperature is greater than the second preset temperature value, the PWM control signal is subjected to dual-loop PID adjustment according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the third set frequency; When the carrier frequency of the PWM control signal is adjusted to the third set frequency, if the device temperature is greater than the third preset temperature value and less than the fourth preset temperature value, the PWM control signal is subjected to dual-loop PID regulation according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the target carrier frequency; if the device temperature is equal to the third preset temperature value, the PWM control signal is subjected to dual-loop PID regulation according to the preset target temperature and the preset target current, and the carrier frequency of the PWM control signal is controlled to be adjusted to the second set frequency; Among them, the second preset temperature value is greater than the fourth preset temperature value, which is greater than the first preset temperature value, which is greater than the third preset temperature value.

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