Control method and control device of cooling fan and energy storage equipment

Abstract

The invention discloses a control method and device of a cooling fan and energy storage equipment. The energy storage device comprises an integrated circuit system, the integrated circuit system comprises a plurality of functional circuits, the functional circuits comprise a battery management circuit, a main control circuit, an inverter circuit and an MPPT circuit, and the control method comprises the steps of obtaining real-time operation data of the integrated circuit system, the real-time operation data comprises temperature data, input power, output power and the working state of each functional circuit, and the temperature data comprises environment temperature and hot spot temperature of power devices in each functional circuit; determining the current operation condition of the integrated circuit system according to the real-time operation data; determining a target rotating speed of the cooling fan according to the current operation condition and the temperature data; and controlling the cooling fan to work according to the target rotating speed and the wind speed change slope. Thus, accurate temperature control can be achieved, overheating damage of devices is avoided, energy consumption of the draught fan can be optimized according to the load requirement, operation noise is reduced, and reliability and safety of the energy storage equipment are improved.

Description

Technical Field

[0001] The present application relates to the field of portable energy storage technology, and in particular to a control method, a control device and an energy storage device for a heat dissipation fan. Background Art

[0002] Typically, portable energy storage devices contain multiple functional circuits, including a BMS board, a main control board, an inverter, and a PV solar charging panel. These modules generate varying degrees of heat during operation, especially at high power input and output. Power devices such as inductors, inverters, capacitors, or MOS tubes experience significant temperature rise. To ensure safe operation of the equipment and improve user experience, fans are required for heat dissipation. In related technologies, fan control schemes often use fixed speeds or simple temperature control triggers, which have drawbacks such as high noise, delayed heat dissipation response, complex coupling of heat dissipation requirements of multiple modules, and difficulty in balancing them with a single control strategy. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application needs to provide a control method, a control device and an energy storage device for a heat dissipation fan.

[0004] The control method of the heat dissipation fan in the embodiment of the present application is used for an energy storage device, wherein the energy storage device includes an integrated circuit system, the integrated circuit system includes multiple functional circuits, and the functional circuits include a battery management circuit, a main control circuit, an inverter circuit, and an MPPT circuit. The control method includes:

[0005] Acquiring real-time operating data of the integrated circuit system, the real-time operating data including temperature data, input power, output power, and operating status of each of the functional circuits, the temperature data including ambient temperature and hot spot temperature of power devices in each of the functional circuits;

[0006] determining a current operating condition of the integrated circuit system according to the real-time operating data;

[0007] Determining a target speed of the cooling fan according to the current operating condition and the temperature data; and

[0008] The heat dissipation fan is controlled to operate according to the target rotation speed and the wind speed change slope.

[0009] In some embodiments, determining the current operating condition of the integrated circuit system based on the real-time operating data includes:

[0010] When the output power is less than a first threshold power and the inverter circuit and the MPPT circuit are not activated, determining that the current operating condition is a first type of operating condition, the first threshold power is related to the maximum output power of the main control circuit;

[0011] Determining a target speed of the cooling fan according to the current operating condition and the temperature data includes:

[0012] When the current operating condition is the first type of operating condition and any of the hot spot temperatures is greater than or equal to a first threshold temperature, the target speed is determined according to the temperature-controlled wind speed coefficient, the first threshold temperature, and the hot spot temperature.

[0013] In some embodiments, the target speed calculation expression includes:

[0014] V_fan==k1×(T_hot-T1_start)

[0015] Wherein, V_fan is the target speed, k1 is the temperature control wind speed coefficient, T_hot is the hot spot temperature, and T1_start is the first threshold temperature.

[0016] In some embodiments, the calculation expression of the temperature control fan coefficient includes:

[0017] k1=(V_max1-V_min) / (T1_max-T1_start)

[0018] Among them, k1 is the temperature control fan coefficient, V_max1 is the maximum wind speed under the first type of working condition, T1_max is the critical temperature rise of the power device, and T1_start is the first threshold temperature.

[0019] In some embodiments, determining the target speed of the cooling fan according to the current operating condition and the temperature data further includes:

[0020] When the current operating condition is the first type of operating condition and the hot spot temperature is lower than a second threshold temperature, the target speed of the cooling fan is determined to be 0, and the second threshold temperature is lower than the first threshold temperature.

[0021] In some embodiments, the first threshold temperature is at least partially related to the operating parameters of the power device, the ambient temperature, the integrated circuit system layout and the heat dissipation capacity of the heat dissipation fan, and the difference between the first threshold temperature and the second threshold temperature is in the range of 2-5 degrees Celsius.

[0022] In some embodiments, determining the current operating condition of the integrated circuit system based on the real-time operating data includes:

[0023] When the inverter circuit is in AC output and the output power is greater than or equal to the second threshold power, the inverter circuit is in AC input and the input power is greater than or equal to the third threshold power, and the current input power of the MPPT circuit is greater than or equal to the fourth threshold power, determining that the current operating condition includes the second type of operating condition;

[0024] Determining a target speed of the cooling fan according to the current operating condition and the temperature data further includes:

[0025] When the current operating condition is the second type of operating condition, the target speed is determined according to the input power or the output power and a power regulation coefficient.

[0026] In some embodiments, the target speed calculation expression includes:

[0027] V_fan=k2*P_out;or

[0028] V_fan=k2*P_in

[0029] Wherein, V_fan is the target speed, k2 is the power regulation coefficient, P_out is the current output power of the inverter circuit, and P_in is the current input power of the inverter circuit or MPPT circuit.

[0030] In some embodiments, the calculation expression of the power adjustment coefficient includes:

[0031] k2 = (V_max2 - V_min2) / P_out,max; or

[0032] k2=P_in,max

[0033] Among them, k2 is the power regulation coefficient, V_max2 is the maximum wind speed under the second type of working condition, V_min2 is the minimum wind speed under the second type of working condition, P_out,max is the maximum output power of the inverter circuit, and P_in,max is the maximum input power of the inverter circuit.

[0034] In some embodiments, determining the current operating condition of the integrated circuit system based on the real-time operating data further includes:

[0035] When the inverter circuit is in AC output and AC input, the current output power of the inverter circuit is greater than or equal to a second threshold power, and the current input power of the inverter circuit is greater than or equal to a third threshold power, determining that the current operating condition is a third type of operating condition;

[0036] Determining a target speed of the cooling fan according to the current operating condition and the temperature data further includes:

[0037] When the current operating condition is the third type of operating condition, the rated minimum wind speed of the heat dissipation fan is used as the target speed.

[0038] In some embodiments, determining the current operating condition of the integrated circuit system based on the real-time operating data includes:

[0039] When the inverter circuit is in AC output and the output power is greater than or equal to a second threshold power and the current input power of the MPPT circuit is greater than or equal to a fourth threshold power, determining that the current operating condition includes a fourth type of operating condition;

[0040] Determining a target speed of the cooling fan according to the current operating condition and the temperature data further includes:

[0041] When the current operating condition is the fourth type of operating condition, the target speed is determined according to the current input power of the MPPT circuit, the current output power of the inverter circuit, and the power regulation coefficient.

[0042] In some embodiments, the target speed calculation expression includes:

[0043] V_fan,target=(w1×P_out / P_out,max+w2×P_in / P_in,max)×(V_max2-V_min2)+V_min2

[0044] Among them, P_out is the current output power of the inverter circuit; P_in is the current input power of the MPPT circuit, w1 is the thermal load weight of the inverter circuit output, w2 is the thermal load weight of the MPPT circuit or the inverter circuit input; P_out,max is the maximum output power of the inverter circuit, P_in,max is the maximum input power of the inverter circuit, V_min2 is the minimum wind speed of the fourth category of working conditions, and V_max2 is the maximum wind speed of the fourth category of working conditions.

[0045] In some embodiments, determining the target speed of the cooling fan according to the current operating condition and the temperature data further includes:

[0046] When the hot spot temperature is greater than a third threshold temperature, the rated maximum wind speed of the heat dissipation fan is used as the target rotation speed.

[0047] In some embodiments, the calculation expression for the wind speed change slope includes:

[0048] ΔV=V_fan(t)-V_fan(t-1) / Δt

[0049] Where ΔV is the wind speed change slope, V_fan(t) is the wind speed at the current moment, V_fan(t-1) is the wind speed at the previous moment, and Δt is the time interval between adjacent moments.

[0050] The control device of the heat dissipation fan in the embodiment of the present application is used for an energy storage device, wherein the energy storage device includes an integrated circuit system, the integrated circuit system includes multiple functional circuits, and the functional circuits include a battery management circuit, a main control circuit, an inverter circuit, and an MPPT circuit. The control device includes:

[0051] an acquisition module, configured to acquire real-time operating data of the integrated circuit system, the real-time operating data including temperature data, input power, output power, and operating status of each of the functional circuits, the temperature data including ambient temperature and hotspot temperature of power devices in each of the functional circuits;

[0052] a determination module, configured to determine a current operating condition of the integrated circuit system according to the real-time operating data, and determine a target speed of the cooling fan according to the current operating condition and the temperature data; and

[0053] A control module is used to control the operation of the heat dissipation fan according to the target rotation speed and the wind speed change slope.

[0054] A control module is used to control the operation of the cooling fan according to the current operating conditions and the temperature data.

[0055] The energy storage device according to the embodiment of the present application includes an integrated circuit system, a heat dissipation fan, a battery module, and a controller. The integrated circuit system includes multiple functional circuits, including a battery management circuit, a main control circuit, an inverter circuit, and an MPPT circuit. The controller is used to:

[0056] Acquiring real-time operating data of the integrated circuit system, the real-time operating data including temperature data, input power, output power, and operating status of each of the functional circuits, the temperature data including ambient temperature and hot spot temperature of power devices in each of the functional circuits;

[0057] determining a current operating condition of the integrated circuit system according to the real-time operating data;

[0058] Determining a target speed of the cooling fan according to the current operating condition and the temperature data; and

[0059] The heat dissipation fan is controlled to operate according to the target rotation speed and the wind speed change slope.

[0060] In the control method, control device, and energy storage device of the embodiments of the present application, by collecting data such as the temperature, power, and module operating status of the integrated circuit system in real time, the current operating condition is dynamically identified. The target speed of the cooling fan is determined based on the current operating condition and temperature information. Finally, the cooling fan operation is controlled according to the target speed and the wind speed change slope. On the one hand, precise temperature control can be achieved to avoid overheating and damage of power devices, and fan energy consumption can be optimized according to load requirements. On the other hand, flexible adjustment of the cooling fan is achieved, reducing operating noise. At the same time, the reliability and adaptability of the energy storage device are improved through the synergistic adjustment of multiple parameters, extending the service life of the energy storage device and improving the user experience.

[0061] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The above and additional aspects and advantages of the present application will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0063] Figure 1 It is a flow chart of a method for controlling a heat dissipation fan according to an embodiment of the present application.

[0064] Figure 2 It is a module schematic diagram of the inverter circuit according to the embodiment of the present application.

[0065] Figure 3 It is a structural diagram of the energy storage device according to the embodiment of the present application.

[0066] Figure 4 It is a module schematic diagram of an integrated circuit board according to an embodiment of the present application.

[0067] Figure 5-10 It is a flow chart of a method for controlling a heat dissipation fan according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0069] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0070] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can mean fixed connection or integral connection; mechanical connection, electrical connection, or mutual communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0071] See also Figure 1 The present application provides a control method for a heat dissipation fan for an energy storage device. The energy storage device includes an integrated circuit system, a heat dissipation fan, a battery module, and a controller. The integrated circuit system includes multiple functional circuits, including a battery management circuit, a main control circuit, an inverter circuit, and an MPPT circuit. The control method includes:

[0072] 01. Obtain real-time operating data of the integrated circuit system, including temperature data, input power, output power, and the working status of each functional circuit. Temperature data includes ambient temperature and hot spot temperature of power devices in each functional circuit;

[0073] 02. Determine the current operating status of the integrated circuit system based on real-time operating data;

[0074] 03. Determine the target speed of the cooling fan based on the current operating conditions and temperature data; and

[0075] 04. Control the cooling fan operation according to the target speed and wind speed change slope.

[0076] See also Figure 2 The embodiment of the present application also provides a control device 10 for a heat dissipation fan, which is used for an energy storage device. The energy storage device includes an integrated circuit system, the integrated circuit system includes multiple functional circuits, and the functional circuits include a battery management circuit, a main control circuit, an inverter circuit and an MPPT circuit. The control device 10 includes an acquisition module 101, a determination module 102 and a control module 103, wherein step 01 can be implemented by the acquisition module 101, steps 02 and 03 can be implemented by the determination module 102, and step 04 can be implemented by the control module 103.

[0077] In other words, the acquisition module 101 can be used to obtain real-time operating data of the integrated circuit system, the real-time operating data including temperature data, input power, output power, and the operating status of each functional circuit, and the temperature data including ambient temperature and the hot spot temperature of the power devices in each functional circuit; the determination module 102 can be used to determine the current operating condition of the integrated circuit system based on the real-time operating data, and determine the target speed of the cooling fan based on the current operating condition and temperature data; the control module 103 can be used to control the operation of the cooling fan according to the target speed and the wind speed change slope.

[0078] See also Figure 3 and Figure 4 The embodiment of the present application also provides an energy storage device 100, which includes an integrated circuit system 20, a heat dissipation fan 30, a battery module and a controller. The integrated circuit system 20 includes multiple functional circuits, including a battery management circuit 201, a main control circuit 202, an inverter circuit 203 and an MPPT circuit 204. The controller is used to: obtain real-time operating data of the integrated circuit system, the real-time operating data including temperature data, input power, output power, and the working status of each functional circuit, the temperature data including ambient temperature and hot spot temperature of power devices in each functional circuit; determine the current operating condition of the integrated circuit system based on the real-time operating data; determine the target speed of the heat dissipation fan 30 based on the current operating condition and the temperature data; and control the operation of the heat dissipation fan 30 based on the target speed and the wind speed change slope.

[0079] In the control method, control device 10, and energy storage device 100 of the heat dissipation fan 30 of the embodiment of the present application, by real-time acquisition of data such as the temperature, power, and module operating status of the integrated circuit system, the current operating condition is dynamically identified. The target speed of the heat dissipation fan is determined based on the current operating condition and temperature information. Finally, the heat dissipation fan operation is controlled according to the target speed and the wind speed change slope. On the one hand, precise temperature control can be achieved to avoid overheating and damage of power devices, and fan energy consumption can be optimized according to load requirements. On the other hand, flexible adjustment of the heat dissipation fan is achieved, reducing operating noise. At the same time, the reliability and adaptability of the energy storage device 100 are improved through the synergy of multiple parameters, extending the service life of the energy storage device 100 and improving the user experience.

[0080] It should be noted that the control device 10 can exist in the form of hardware or software. The control device 10 can be an independent component independent of the energy storage device 100. The control device 10 can also be a part of the energy storage device 100 and integrated within the energy storage device 100 in the form of hardware or software, or in other words, the energy storage device 100 includes the control device 10. For example, when the control device 10 is integrated within the energy storage device 100 as part of the energy storage device 100, the control device 10 can be integrated within a controller or an integrated circuit system.

[0081] See also Figure 3 and Figure 4 Energy storage device 100 refers to a device capable of storing power. Energy storage device 100 may be a portable energy storage device, for example, a portable outdoor device. It should be noted that a portable energy storage device is a portable, portable electrical energy storage and supply device.

[0082] The energy storage device 100 may include an integrated circuit system 20, a battery module, a heat dissipation fan 30, and multiple temperature sensors. The battery module can be recharged and used repeatedly. The battery module stores a large amount of power. When needed, the energy storage device 100 outputs the power stored in the battery module for use. The integrated circuit system 20 can be connected to the battery module to achieve charge and discharge management of the battery module. The heat dissipation fan 30 can be integrated into the integrated circuit system 20. As a part of the integrated circuit system 20, the heat dissipation fan 30 is used to achieve heat dissipation of the integrated circuit system 20. The heat dissipation fan 30 can be one or more, and the specific number is not limited. The temperature sensor may include multiple, multiple respectively arranged in various areas of the integrated circuit system 20, and the user detects the ambient temperature and the hot spot temperature of each power device in the integrated circuit system 20. The temperature sensor may be, but is not limited to, a thermocouple, a thermistor, a semiconductor temperature sensor (such as an NTC sensor), etc.

[0083] The integrated circuit system 20 may integrate multiple functional circuits, each of which may include one or more power devices, including but not limited to inductors, transformers, capacitors, and MOS devices. The functional circuits may include a battery management circuit 201, a main control circuit 202, an inverter circuit 203, and an MPPT circuit 204. Temperature detection points may be set in the areas where at least some of the power devices are located, and temperature sensors may be installed at the temperature detection points to detect the hotspot temperatures of the power devices.

[0084] Among them, the battery management circuit 201 can be a battery management system (BMS) used to monitor the voltage, current, temperature and other key parameters of the battery module in real time, accurately control and optimize the charging and discharging process of the battery module, and prevent abnormal conditions such as overcharging, over-discharging, and overheating of the battery module, thereby ensuring the safe use of the battery module.

[0085] The main control circuit 202 is the global control center of the energy storage device 100, responsible for coordinating the energy flow, external interfaces, user interaction, and security management of the entire device. It covers the entire chain from power input (charging) to output (discharging), is compatible with multiple input and output modes (such as solar power, mains charging, AC / DC discharging), and can match the power requirements of different power devices. The controller can be part of the main control circuit 202, or in other words, the main control circuit 202 can include the controller. In this way, the main control circuit 202 can implement the control method of the present application, thereby ensuring the reliability and adaptability of the energy storage device 100 and improving the user experience.

[0086] Inverter circuit 203 is used to convert the DC power in the battery pack of energy storage device 100 into AC power. MPPT circuit 204 converts the DC power generated by the solar photovoltaic system (photovoltaic panel) into power suitable for charging the battery module. By monitoring the current output power of the photovoltaic panel in real time, MPPT circuit 204 can convert and regulate unstable DC voltage and current into stable DC voltage and current suitable for charging the battery module, ensuring that the photovoltaic panel always operates near the maximum power point (MPPT), thereby improving the utilization efficiency of the photovoltaic panel.

[0087] It is understandable that power devices generate significant heat during operation, and the amount of heat generated by different power devices may vary, which may cause local temperatures in certain areas to be too high, thereby affecting the lifespan and safety of the power devices. Therefore, in order to improve the heat dissipation effect of the heat dissipation fan 30, the arrangement of the functional circuits can be set, and the functional circuits with high heat generation are set close to the heat dissipation fan 30, and the functional circuits with low heat generation are set away from the heat dissipation fan 30. For example, since the power devices in the inverter circuit 203 generate high heat, while the power devices in the main control circuit 202 generate lower heat, the inverter circuit 203 can be set close to the heat dissipation fan 30, and the main control circuit 202 can be set further away from the heat dissipation fan 30 (e.g., Figure 4 shown).

[0088] In step 01, the controller or acquisition module 101 can be electrically connected to each functional circuit and temperature sensor in the integrated circuit system 20 to obtain real-time operating data of the integrated circuit system 20. Real-time operating data may include, but is not limited to, temperature data, voltage data, current data, power data, and the operating status of each functional circuit. Temperature data can include the ambient temperature of the integrated circuit system 20 and the hotspot temperatures of each power device. Power data can include system input power, system output power, the current input power and output power of the inverter circuit 203, the current input power and output power of the MPPT circuit 204, and the like. It is understood that power data can be directly acquired or calculated based on voltage and current. Voltage data can include input and output voltages detected by the battery management system, the input and output voltages of the inverter circuit 203, and the input and output voltages of the MPPT circuit 204. Current data can include input and output currents detected by the battery management system, the input and output currents of the inverter circuit 203, and the input and output currents of the MPPT circuit 204.

[0089] In step 02, the current operating conditions of the integrated circuit system may include, but are not limited to, four operating conditions: a first operating condition, a second operating condition, a third operating condition, and a fourth operating condition. In the first operating condition, only USB output is provided (the main control circuit 202 outputs DC through the USB interface). In the second operating condition, only one of the MPPT circuit 204 or the inverter circuit 203 is operational. In the third operating condition, the MPPT circuit 204 and the inverter circuit 203 operate together, and the energy storage device 100 is in an AC input + AC output state. Although the MPPT circuit 204 and the inverter circuit 203 provide power, they do not actually bear the load. In the fourth operating condition, the MPPT circuit 204 and the inverter circuit 203 operate together, and the energy storage device 100 is in an MPPT circuit 204 input + AC output state. Both the MPPT circuit 204 and the inverter circuit 203 participate in energy conversion.

[0090] In step 03, the target speed of the cooling fan refers to the speed that the cooling fan is ultimately to achieve under the current operating conditions.

[0091] In step 04, the wind speed change slope is used to linearly increase or decrease the cooling fan's wind speed to the target speed. Understandably, if the difference between the cooling fan's current wind speed and the target speed is too large, causing the cooling fan's wind speed to rapidly change to the target speed can easily produce sharp noise, affecting the user experience. Therefore, setting the wind speed change slope can prevent the sharp noise caused by sudden changes in the cooling fan's wind speed. In this way, by controlling the cooling fan's operation according to the target speed and the wind speed change slope, the cooling fan can adapt to different operating conditions and achieve precise temperature control, avoiding overheating and damage to power devices while reducing operating noise. Furthermore, through the synergistic effect of multiple parameters, system reliability and adaptability are improved, thereby enhancing the user experience.

[0092] The calculation expressions for the wind speed change slope include:

[0093] ΔV=V_fan(t)-V_fan(t-1) / Δt

[0094] Where ΔV is the wind speed change slope, V_fan(t) is the wind speed at the current moment, V_fan(t-1) is the wind speed at the previous moment, and Δt is the time interval between adjacent moments.

[0095] The wind speed change slope is limited to [ΔVmin, ΔVmax], where ΔVmin is the minimum wind speed adjustment, the smallest step required for smooth changes, and ΔVmax is the maximum wind speed adjustment. Sudden noise changes or exceeding the motor's response capability should be avoided. ΔVmin and ΔVmax can be determined through fan response characteristic testing. This test is understandably a key step in evaluating a cooling fan's dynamic response to input signals (such as speed and power commands) under different operating conditions. It is primarily used to verify the cooling fan's control performance, stability, and reliability.

[0096] In addition, it should be noted that the wind speed of the cooling fan can be controlled by adjusting the duty cycle of the pulse width modulation signal (PWM), wind speed = f(PWM%), and the larger the PWM duty cycle, the greater the wind speed value.

[0097] See also Figure 5 In some embodiments, step 02 includes:

[0098] 021, when the output power is less than a first threshold power and the inverter circuit and the MPPT circuit are not activated, determining that the current operating condition is a first type of operating condition, where the first threshold power is related to the maximum output power of the main control circuit;

[0099] Step 03 includes:

[0100] 031, when the current operating condition is the first type of operating condition and any hot spot temperature is greater than or equal to the first threshold temperature, the target speed is determined based on the temperature control wind speed coefficient, the first threshold temperature and the hot spot temperature.

[0101] In some embodiments, step 021 and step 031 can be implemented by the determination module 102, or in other words, the determination module 102 can be used to determine that the current operating condition is a first type of operating condition when the output power is less than the first threshold power and the inverter circuit and the MPPT circuit are not activated, and the first threshold power is related to the maximum output power of the main control circuit; and when the current operating condition is a first type of operating condition and there is any hot spot temperature greater than or equal to the first threshold temperature, determine the target speed based on the temperature control wind speed coefficient, the first threshold temperature and the hot spot temperature.

[0102] In certain embodiments, the controller can be used to determine that the current operating condition is a first type of operating condition when the output power is less than a first threshold power and the inverter circuit and the MPPT circuit are not activated, and the first threshold power is related to the maximum output power of the main control circuit; and when the current operating condition is a first type of operating condition and there is any hot spot temperature greater than or equal to the first threshold temperature, determine the target speed based on the temperature control wind speed coefficient, the first threshold temperature and the hot spot temperature.

[0103] It should be noted that the first threshold temperature can be the start-up temperature of the heat dissipation fan. That is, when the hotspot temperature of any power device exceeds the start-up temperature of the heat dissipation fan, the heat dissipation fan is activated and operates at the target speed. The first threshold temperature is related to at least part of the operating parameters of the power device, the ambient temperature, the layout of the integrated circuit system 20, and the heat dissipation capacity of the heat dissipation fan. The operating parameters of the power device can refer to the safe operating temperature of the power device. For example, the stronger the heat dissipation capacity of the heat dissipation fan and the greater the temperature resistance of the power device, the higher the first threshold temperature can be set. The first threshold power can be equal to or slightly less than the maximum output power of the main control circuit.

[0104] In the first operating mode, since only USB output is available, the integrated circuit system 20 generates heat primarily in the main control circuit. Due to the low power consumption, the power components generate minimal heat. Therefore, in this operating mode, the cooling fan is activated only when the hotspot temperature exceeds the first threshold temperature.

[0105] In this embodiment, the target speed calculation expression includes:

[0106] V_fan==k1×(T_hot-T1_start)

[0107] Wherein, V_fan is the target speed, k1 is the temperature control wind speed coefficient, T_hot is the hot spot temperature, and T1_start is the first threshold temperature.

[0108] The calculation expressions of the temperature control fan coefficient include:

[0109] k1=(V_max1-V_min) / (T1_max-T1_start)

[0110] Among them, k1 is the temperature control fan coefficient, V_max1 is the maximum wind speed under the first type of working condition, V_max1 can be confirmed based on simulation and actual testing, T1_max is determined by the critical temperature rise of the power device, and T1_start is the first threshold temperature.

[0111] In addition, k1 can be fine-tuned through experimental calibration to make the temperature and wind speed response smoother.

[0112] See also Figure 6 In some embodiments, step 03 further includes:

[0113] 032. When the current operating condition is the first type of operating condition and the hot spot temperature is less than the second threshold temperature, determine that the target speed of the cooling fan is 0, and the second threshold temperature is less than the first threshold temperature.

[0114] In some embodiments, step 032 can be implemented by the control module 103, or in other words, the control module 103 can be used to determine that the target speed of the cooling fan is 0 and the second threshold temperature is less than the first threshold temperature when the current operating condition is the first type of operating condition and the hot spot temperature is less than the second threshold temperature.

[0115] In some embodiments, the controller can be used to determine that the target speed of the cooling fan is 0 and the second threshold temperature is less than the first threshold temperature when the current operating condition is the first type of operating condition and the hot spot temperature is less than the second threshold temperature.

[0116] It should be noted that the second threshold temperature is the stop temperature threshold of the cooling fan. The first threshold temperature is greater than the second threshold temperature. The setting of the second threshold temperature can prevent the fan from starting and stopping frequently. The difference between the first threshold temperature and the second threshold temperature is in the range of 2-5 degrees Celsius.

[0117] In this way, when the integrated circuit system 20 is in the first operating condition and the hotspot temperature is lower than the second threshold temperature, the heat dissipation fan can be controlled to be turned off, thereby saving energy consumption of the integrated circuit system 20 .

[0118] See also Figure 7 In some embodiments, step 02 includes:

[0119] 022, when the inverter circuit is in AC output mode and the output power is greater than or equal to the second threshold power, the inverter circuit is in AC input mode and the input power is greater than or equal to the third threshold power, and the current input power of the MPPT circuit is greater than or equal to the fourth threshold power, determining that the current operating condition includes the second type of operating condition;

[0120] Step 03 includes:

[0121] 033. When the current operating condition is the second type of operating condition, the target speed is determined based on the input power or output power and the power adjustment coefficient.

[0122] In some embodiments, sub-steps 022 and 033 can be implemented by the determination module 102, or in other words, the determination module 102 can be used to determine that the current operating condition includes the second type of operating condition when the inverter circuit is in AC output and the output power is greater than or equal to the second threshold power, the inverter circuit is in AC input and the input power is greater than or equal to the third threshold power, and the current input power of the MPPT circuit is greater than or equal to the fourth threshold power. When the current operating condition is the second type of operating condition, the target speed is determined based on the input power or output power and the power adjustment coefficient.

[0123] In certain embodiments, the controller can be used to determine that the current operating condition includes the second type of operating condition when the inverter circuit is in AC output and the output power is greater than or equal to the second threshold power, the inverter circuit is in AC input and the input power is greater than or equal to the third threshold power, and the current input power of the MPPT circuit is greater than or equal to the fourth threshold power. When the current operating condition is the second type of operating condition, the target speed is determined based on the input power or output power and the power regulation coefficient.

[0124] It should be noted that the second threshold power is the minimum threshold for determining whether the inverter circuit is discharging and outputting. The second threshold power can be verified by thermal simulation and testing. The third threshold power is the minimum threshold for determining whether the inverter circuit is in the AC charging state. The third threshold power is set according to the lower limit of the current / power identified by the AC charging module. The fourth threshold power is the minimum power required to determine whether the MPPT circuit is working. The fourth threshold power is determined by setting the minimum activation threshold without temperature rise at low power. Under the second type of operating condition, the energy storage device 100 is in charging mode (inverter circuit AC input or MPPT input) or discharging mode (inverter circuit AC output).

[0125] In the second type of working condition, the inverter circuit or MPPT circuit is the main heat source, and the heat generated by the power device is large. According to the current working mode, the output power or input power is used as the basis to control the wind speed of the cooling fan to increase linearly.

[0126] If it is the discharge mode, the calculation expression of the target speed includes:

[0127] V_fan=k2*P_out;

[0128] Among them, V_fan is the target speed, k2 is the power regulation coefficient, which represents the influence coefficient of output power on wind speed in the MPPT circuit / inverter circuit working condition, and P_out is the current output power of the inverter circuit, which can be estimated by the power acquisition module.

[0129] The calculation expression of power regulation coefficient includes:

[0130] k2=(V_max2-V_min2) / P_out,max;

[0131] Among them, k2 is the power regulation coefficient, V_max2 is the maximum wind speed under the second type of working condition, V_max2 can be confirmed by simulation and actual test, V_min2 is the minimum wind speed under the second type of working condition, V_min2 can be confirmed by simulation and actual test, and P_out,max is the maximum output power of the inverter circuit.

[0132] In addition, k2 can be fine-tuned through experimental calibration to make the reaction between temperature and wind speed smoother.

[0133] If it is charging mode, the calculation expression of the target speed includes:

[0134] V_fan=k2*P_in

[0135] Among them, V_fan is the target speed, k2 is the power regulation coefficient, and P_in is the current input power of the inverter circuit or MPPT circuit, which can be estimated by the power acquisition module.

[0136] The calculation expression of power regulation coefficient includes:

[0137] k2=P_in,max

[0138] Wherein, k2 is the power regulation coefficient, and P_in,max is the maximum input power of the inverter circuit or MPPT circuit.

[0139] In this way, by real-time monitoring of the output / input power of the inverter circuit and the MPPT input power, it is determined whether it is in the second type of operating condition, and the target speed is dynamically adjusted under the second type of operating condition, thereby improving system efficiency, enhancing dynamic response capabilities and protecting equipment safety.

[0140] See also Figure 8 In some embodiments, step 02 includes:

[0141] 023, when the inverter circuit is in AC output and AC input, the current output power of the inverter circuit is greater than or equal to the second threshold power, and the current input power of the inverter circuit is greater than or equal to the third threshold power, determining that the current operating condition is the third type of operating condition;

[0142] Step 03 includes:

[0143] 034. When the current operating condition is the third type of operating condition, the rated minimum wind speed of the cooling fan is used as the target speed.

[0144] In some embodiments, sub-steps 023 and 034 can be implemented by the determination module 102, or in other words, the determination module 102 can be used to determine that the current operating condition is a third-category operating condition when the inverter circuit is in AC output and AC input, the current output power of the inverter circuit is greater than or equal to the second threshold power, and the current input power of the inverter circuit is greater than or equal to the third threshold power, and when the current operating condition is the third-category operating condition, use the rated minimum wind speed of the cooling fan as the target speed.

[0145] In certain embodiments, the controller can be used to determine that the current operating condition is a third type of operating condition when the inverter circuit is in AC output and AC input, the current output power of the inverter circuit is greater than or equal to the second threshold power, and the current input power of the inverter circuit is greater than or equal to the third threshold power, and when the current operating condition is the third type of operating condition, use the rated minimum wind speed of the cooling fan as the target speed.

[0146] The second threshold power is the minimum threshold for determining whether the inverter circuit is discharging and outputting. The second threshold power can be verified by thermal simulation and testing. The third threshold power is the minimum threshold for determining whether the inverter circuit is in the AC charging state. The third threshold power is set according to the current / power lower limit identified by the AC charging module.

[0147] The third operating condition is when the inverter and MPPT circuits operate together. Energy storage device 100 is in AC input and AC output mode, and integrated circuit system 20 operates in bypass mode. The MPPT and inverter circuits provide power but bear no actual load, resulting in low heat generation. Therefore, in this operating condition, if the cooling fan is already on, it can be kept running at a low speed. If it is not on, the cooling fan is not activated.

[0148] See also Figure 9 In some embodiments, step 02 includes:

[0149] 024, when the inverter circuit is in AC output and the output power is greater than or equal to the second threshold power and the current input power of the MPPT circuit is greater than or equal to the fourth threshold power, determining that the current operating condition includes the fourth type of operating condition;

[0150] Step 03 includes:

[0151] 035. When the current operating condition is the fourth type of operating condition, the target speed is determined according to the current input power of the MPPT circuit, the current output power of the inverter circuit and the power adjustment coefficient.

[0152] In some embodiments, sub-steps 024 and 035 can be implemented by the determination module 102, or in other words, the determination module 102 can be used to determine that the current operating condition includes the fourth type of operating condition when the inverter circuit is in AC output and the output power is greater than or equal to the second threshold power and the current input power of the MPPT circuit is greater than or equal to the fourth threshold power, and when the current operating condition is the fourth type of operating condition, determine the target speed based on the current input power of the MPPT circuit, the current output power of the inverter circuit, and the power adjustment coefficient.

[0153] In certain embodiments, the controller can be used to determine that the current operating condition includes a fourth type of operating condition when the inverter circuit is in AC output and the output power is greater than or equal to a second threshold power and the current input power of the MPPT circuit is greater than or equal to a fourth threshold power, and when the current operating condition is a fourth type of operating condition, determine the target speed based on the current input power of the MPPT circuit, the current output power of the inverter circuit, and the power regulation coefficient.

[0154] The third operating condition is that the inverter circuit and the MPPT circuit work together. The energy storage device 100 is in the MPPT circuit input + AC output state. The solar energy is charged while driving the inverter circuit. At this time, the MPPT circuit and the inverter circuit are both involved in energy conversion, and the heat load is large. Therefore, under this operating condition, the target speed of the cooling fan needs to be determined according to the operating conditions of the inverter circuit and the MPPT circuit.

[0155] In this embodiment, the target speed calculation expression includes:

[0156] V_fan,target=(w1×P_out / P_out,max+w2×P_in / P_in,max)×(V_max2-V_min2)+V_min2

[0157] Among them, P_out is the current output power of the inverter circuit, which can be estimated by the power acquisition module; P_in is the current input power of the MPPT circuit or the inverter circuit, which can be estimated by the power acquisition module, w1 is the thermal load weight output by the inverter circuit, which can be confirmed by thermal simulation and actual testing (such as equal to 0.5~0.8), w2 is the thermal load weight input by the MPPT circuit or the inverter circuit, which can be confirmed by thermal simulation and actual testing (such as equal to 0.5~0.8); P_out,max is the maximum output power of the inverter circuit, P_in,max is the maximum input power of the inverter circuit, V_min2 is the minimum wind speed under the fourth type of working condition, which can be confirmed by thermal simulation and actual testing, and V_max2 is the maximum wind speed under the fourth type of working condition, which can be confirmed by thermal simulation and actual testing.

[0158] See also Figure 10 In some embodiments, step 03 further includes:

[0159] 036. When the hot spot temperature is greater than the third threshold temperature, the rated maximum wind speed of the cooling fan is used as the target speed.

[0160] In some embodiments, step 036 may be implemented by the determination module 102 , or in other words, the determination module 102 may also be configured to use the rated maximum wind speed of the cooling fan as the target speed when the hotspot temperature is greater than the third threshold temperature.

[0161] In certain embodiments, the controller may be further configured to use the rated maximum wind speed of the heat dissipation fan as the target rotation speed when the hot spot temperature is greater than a third threshold temperature.

[0162] The third threshold temperature is greater than the first threshold temperature. The third threshold temperature may be a temperature rise trigger compensation threshold and may be set according to a long-term operating temperature limit of the main control circuit or the battery management circuit.

[0163] In this way, under high load or high temperature environment, the integrated circuit system 20 can be kept at maximum heat dissipation capacity. Continuous strong heat dissipation can delay temperature rise, improve the system's continuous operation capability, and quickly discharge heat from the inverter circuit, MPPT circuit or battery management circuit to prevent key components (such as IGBT, capacitors, inductors and other power devices) from overheating.

[0164] It should also be noted that to prevent damage to power devices due to overheating, each temperature detection point is also equipped with an OTP protection point and an OTP recovery point. The OTP protection point is used to trigger OTP protection, while the OTP recovery point is used to disable OTP protection. If the temperature sensor detects that the temperature of any temperature detection point exceeds the temperature of the OTP protection point, the OTP protection function is triggered, thereby cutting off power. The OTP protection function is then disabled at the OTP recovery point. The OTP protection point is greater than the preset threshold temperature.

[0165] Throughout this specification, reference to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0166] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A control method for a heat dissipation fan, used for an energy storage device, characterized in that: The energy storage device includes an integrated circuit system, the integrated circuit system includes multiple functional circuits, the functional circuits include a battery management circuit, a main control circuit, an inverter circuit and an MPPT circuit, and the control method includes: Acquiring real-time operating data of the integrated circuit system, the real-time operating data including temperature data, input power, output power, and operating status of each of the functional circuits, the temperature data including ambient temperature and hot spot temperature of power devices in each of the functional circuits; determining a current operating condition of the integrated circuit system according to the real-time operating data; Determining a target speed of the cooling fan according to the current operating condition and the temperature data; and The heat dissipation fan is controlled to operate according to the target rotation speed and the wind speed change slope.

2. The control method according to claim 1, characterized in that: Determining a current operating condition of the integrated circuit system according to the real-time operating data includes: When the output power is less than a first threshold power and the inverter circuit and the MPPT circuit are not activated, determining that the current operating condition is a first type of operating condition, the first threshold power is related to the maximum output power of the main control circuit; Determining a target speed of the cooling fan according to the current operating condition and the temperature data includes: When the current operating condition is the first type of operating condition and any of the hot spot temperatures is greater than or equal to a first threshold temperature, the target speed is determined according to the temperature-controlled wind speed coefficient, the first threshold temperature, and the hot spot temperature.

3. The control method according to claim 2, characterized in that: The target speed calculation expression includes: V_fan==k1×(T_hot-T1_start) Where V_fan is the target speed, k1 is the temperature control wind speed coefficient, T_hot is the hot spot temperature, and T1_start is the first threshold temperature; The calculation expression of the temperature control fan coefficient includes: k1=(V_max1-V_min) / (T1_max-T1_start) Among them, k1 is the temperature control fan coefficient, V_max1 is the maximum wind speed under the first type of working condition, T1_max is the critical temperature rise of the power device, and T1_start is the first threshold temperature.

4. The control method according to claim 2, characterized in that: Determining a target speed of the cooling fan according to the current operating condition and the temperature data further includes: When the current operating condition is the first type of operating condition and the hot spot temperature is lower than a second threshold temperature, the target speed of the cooling fan is determined to be 0, and the second threshold temperature is lower than the first threshold temperature.

5. The control method according to claim 1, characterized in that: Determining a current operating condition of the integrated circuit system according to the real-time operating data includes: When the inverter circuit is in AC output and the output power is greater than or equal to the second threshold power, the inverter circuit is in AC input and the input power is greater than or equal to the third threshold power, and the current input power of the MPPT circuit is greater than or equal to the fourth threshold power, determining that the current operating condition includes the second type of operating condition; Determining a target speed of the cooling fan according to the current operating condition and the temperature data further includes: When the current operating condition is the second type of operating condition, the target speed is determined according to the input power or the output power and a power regulation coefficient.

6. The control method according to claim 5, characterized in that: The target speed calculation expression includes: V_fan=k2*P_out;or V_fan=k2*P_in Where V_fan is the target speed, k2 is the power regulation coefficient, P_out is the current output power of the inverter circuit, and P_in is the current input power of the inverter circuit or MPPT circuit; The calculation expression of the power regulation coefficient includes: k2 = (V_max2 - V_min2) / P_out,max; or k2=P_in,max Among them, k2 is the power regulation coefficient, V_max2 is the maximum wind speed under the second type of working condition, V_min2 is the minimum wind speed under the second type of working condition, P_out,max is the maximum output power of the inverter circuit, and P_in,max is the maximum input power of the inverter circuit or MPPT circuit.

7. The control method according to claim 1, characterized in that: Determining a current operating condition of the integrated circuit system according to the real-time operating data further includes: When the inverter circuit is in AC output and AC input, the current output power of the inverter circuit is greater than or equal to a second threshold power, and the current input power of the inverter circuit is greater than or equal to a third threshold power, determining that the current operating condition is a third type of operating condition; Determining a target speed of the cooling fan according to the current operating condition and the temperature data further includes: When the current operating condition is the third type of operating condition, the rated minimum wind speed of the heat dissipation fan is used as the target speed.

8. The control method according to claim 1, characterized in that: Determining a current operating condition of the integrated circuit system according to the real-time operating data includes: When the inverter circuit is in AC output and the output power is greater than or equal to a second threshold power and the current input power of the MPPT circuit is greater than or equal to a fourth threshold power, determining that the current operating condition includes a fourth type of operating condition; Determining a target speed of the cooling fan according to the current operating condition and the temperature data further includes: When the current operating condition is the fourth type of operating condition, the target speed is determined according to the current input power of the MPPT circuit, the current output power of the inverter circuit, and the power regulation coefficient.

9. The control method according to claim 8, characterized in that: The target speed calculation expression includes: V_fan,target=(w1×P_out / P_out,max+w2×P_in / P_in,max)×(V_max2-V_min2)+V_min2 Among them, P_out is the current output power of the inverter circuit; P_in is the current input power of the MPPT circuit, w1 is the thermal load weight of the inverter circuit output, w2 is the thermal load weight of the MPPT circuit or the inverter circuit input; P_out,max is the maximum output power of the inverter circuit, P_in,max is the maximum input power of the inverter circuit, V_min2 is the minimum wind speed of the fourth category of working conditions, and V_max2 is the maximum wind speed of the fourth category of working conditions.

10. The control method according to claim 1, characterized in that: Determining a target speed of the cooling fan according to the current operating condition and the temperature data further includes: When the hot spot temperature is greater than a third threshold temperature, the rated maximum wind speed of the heat dissipation fan is used as the target rotation speed.

11. The control method according to any one of claims 1 to 10, characterized in that: The calculation expression of the wind speed change slope includes: ΔV=V_fan(t)-V_fan(t-1) / Δt Where ΔV is the wind speed change slope, V_fan(t) is the wind speed at the current moment, V_fan(t-1) is the wind speed at the previous moment, and Δt is the time interval between adjacent moments.

12. A control device for a heat dissipation fan, used for energy storage equipment, characterized in that: The energy storage device includes an integrated circuit system, the integrated circuit system includes multiple functional circuits, the functional circuits include a battery management circuit, a main control circuit, an inverter circuit and an MPPT circuit, and the control device includes: an acquisition module, configured to acquire real-time operating data of the integrated circuit system, the real-time operating data including temperature data, input power, output power, and operating status of each of the functional circuits, the temperature data including ambient temperature and hotspot temperature of power devices in each of the functional circuits; a determination module, configured to determine a current operating condition of the integrated circuit system based on the real-time operating data, and determine a target speed of the cooling fan based on the current operating condition and the temperature data; and A control module is used to control the operation of the heat dissipation fan according to the target rotation speed and the wind speed change slope.

13. An energy storage device, characterized in that: The device comprises an integrated circuit system, a heat dissipation fan, a battery module and a controller. The integrated circuit system comprises multiple functional circuits, including a battery management circuit, a main control circuit, an inverter circuit and an MPPT circuit. The controller is used to: Acquiring real-time operating data of the integrated circuit system, the real-time operating data including temperature data, input power, output power, and operating status of each of the functional circuits, the temperature data including ambient temperature and hot spot temperature of power devices in each of the functional circuits; determining a current operating condition of the integrated circuit system according to the real-time operating data; determining a target speed of the cooling fan according to the current operating condition and the temperature data; and The heat dissipation fan is controlled to operate according to the target rotation speed and the wind speed change slope.

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