Control method for designing working mode of power supply through regulation and control along with temperature and power supply

Abstract

The invention discloses a control method for designing a working mode of a power supply according to temperature regulation and control and the power supply, and belongs to the technical field of switching power supplies, and the method comprises the steps: collecting the temperature of a power device in a main power array in a working state in a change-over switch power supply circuit in real time; comparing and judging the temperature of the power device in the working state according to a preset temperature threshold group so as to design and select the working mode of the switching power supply circuit; adjusting and outputting a corresponding modal control signal according to the designed and selected working modal; a corresponding main power circuit is controlled to work based on the modal control signal, so that the switching power supply circuit works in a proper working mode; and the temperature is monitored in real time, and the working modes of the switching power supply circuit are dynamically switched in a closed-loop regulation manner. The working mode of the switching power supply circuit can be dynamically regulated and controlled according to the temperature of the power device, so that the switching power supply circuit works in a proper working mode, the working main power circuit and the number of devices are optimized, and the reliability of power supply design work is improved.

Description

Technical Field

[0001] This invention belongs to the field of switching power supply technology, specifically relating to a method for controlling the operating mode of a power supply based on temperature regulation and a power supply thereof. Background Technology

[0002] Switching power supplies are a crucial component of electronic products, providing the necessary voltage, current, and power for normal operation. With the diversification of electronic product usage scenarios, switching power supplies must also meet the corresponding needs. Today, electronic products are no longer limited to a single power state; they operate at low power during certain periods and at high power during others. Therefore, the switching power supplies for electronic products should be designed to meet both low-power and high-power applications.

[0003] In switching power supply design, low-power power supplies typically employ simple circuit topologies. For example, the output rectifier circuit uses diode asynchronous rectification, with the power diodes meeting the heat dissipation requirements of low-power applications. This design is simple, with few operating components, resulting in a simple and reliable power supply. However, as power output increases, switching power supply topologies become more complex. For instance, some partial-power supply designs use output MOSFET synchronous rectification, which is beneficial for medium-power applications. Utilizing MOSFETs to reduce heat dissipation meets the general medium-power design requirements. This necessitates increasing the number of operating components, making the circuit design increasingly complex. Furthermore, if power output increases further, even more complex topologies are required. For example, a multi-phase parallel power supply topology might be designed, using parallel MOSFET-based main power circuits to ensure each MOSFET meets the heat dissipation requirements. This further increases the number of components, making the circuit design and reliability more complex. For applications where power consumption varies between periods, a low-power topology is clearly insufficient for high-power applications. If a high-power power supply topology is used, when the power supply power is low, too many circuit devices will be working, making the circuit operation complex and the reliability design complicated and redundant.

[0004] Secondly, the use of electronic products is no longer limited to typical everyday temperature environments (e.g., 25°C). Depending on the user's application scenario, temperatures can vary, ranging from high to low. Especially in high-temperature environments, the design of switching power supplies requires close monitoring of the temperature of the power devices within the circuit. This is to prevent the combined effect of the operating temperature of the power devices and the ambient temperature from causing the device temperature to exceed its specifications. Therefore, for high-temperature applications, it is essential to monitor the temperature of the power devices in the switching power supply circuit in real time to improve the reliability of both the power devices and the power supply itself in high-temperature applications.

[0005] Furthermore, the actual operating environment for electronic products often involves complex and variable temperature and power conditions. For example, an electronic product might operate at low power but under high ambient temperatures. In such cases, if the switching power supply circuit topology is designed solely for low-power applications, while the power devices within the circuit may meet the requirements, the overall operating temperature of the power supply will be high, potentially exceeding the specifications of the power devices. In such situations, a higher-power power supply topology should be considered to reduce the operating temperature of the power devices and improve the reliability of both the device application and the overall power supply design.

[0006] Therefore, as mentioned above, existing switching power supply control schemes can only operate in pre-designed power supply operating modes when faced with different power applications and different temperature operating conditions. They cannot maintain the operating temperature stability of the main power devices while maintaining the flexibility and reliability of the power supply operating mode design. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, this invention provides a method for temperature-dependent power supply operating mode control and a power supply itself. The technical problem to be solved by this invention is achieved through the following technical solution: In a first aspect, the present invention provides a method for temperature-dependent power supply operating mode control, comprising: Real-time monitoring, sampling, and feedback of the temperature of the power devices corresponding to each main power circuit in the main power array of the switching power supply circuit that is in operation; The temperature of the power devices in the main power array under working condition is comprehensively compared and determined based on the preset temperature threshold group in order to design and select the power supply working mode of the switching power supply circuit. Adjust the corresponding mode control signal of the output according to the power supply operating mode selected in the design and the corresponding logic operation. Based on the mode control signal, the corresponding main power circuit is controlled to work, and the switching power supply circuit is adjusted in real time to work in a suitable power supply mode. Real-time monitoring of the temperature of power devices in the main power array, and closed-loop control of the dynamic switching of the power supply operating modes of the switching power supply circuit; among which, The power supply operating modes of switching power supply circuit design include: asynchronous rectification mode, synchronous rectification mode, multiphase parallel mode, and power supply protection mode.

[0008] Secondly, the present invention provides a power supply whose operating mode is designed to be adjustable with temperature, comprising: The system includes a drive control array, a main power array, a sampling feedback array, a temperature comparison and determination array, and a digital logic processing circuit; among which, The drive control array is used to control the corresponding main power circuit in the main power array to work according to the received modal control signal; The main power array is designed to operate in a suitable power supply mode and output a corresponding power supply voltage under the control of the drive control array. The power supply modes include: asynchronous rectification mode, synchronous rectification mode, multiphase parallel mode, and power supply protection mode. The sampling feedback array is used to monitor, sample, and provide feedback on the temperature of the corresponding power devices in each power circuit of the main power circuit that is in operation in real time. The temperature comparison and determination array is used to comprehensively compare and determine the temperature of power devices in the main power circuit that is in operation based on a preset temperature threshold group, and output the comparison result. The digital logic processing circuit is used to comprehensively process the comparison results and output the corresponding power supply operating mode design mode control signal.

[0009] The beneficial effects of this invention are: The solution provided by this invention uses the temperature of the power devices in the switching power supply as the feedback point. By real-time monitoring, sampling, and feedback of the power device temperature, a comprehensive comparison is made with the designed preset temperature threshold. This allows for comprehensive adjustment of the power supply's operation in different power supply operating modes, ensuring that the power devices meet the operating temperature specifications. Simultaneously, based on the actual operating temperature of the power devices, the main power circuit and the number of devices are adjusted and optimized, simplifying the power supply design or increasing the power consumption design, optimizing the temperature of the power devices, and optimizing the power supply circuit design. This control method can flexibly adjust the power supply to different designed operating modes under varying power consumption and ambient temperature conditions, improving the reliability of the power devices. It also simplifies the power supply design by adjusting the switching power supply circuit and power devices to operate in suitable modes, or by increasing the number of operating power devices and enhancing the power consumption design of the switching power supply circuit, thus comprehensively improving the reliability of the power supply. It is applicable to different temperature environments and power applications, and is also suitable for situations with dynamic changes in power consumption or operating temperature, making it suitable for scenarios requiring flexible adjustment of the power supply's operating modes. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the control steps of a temperature-controlled power supply operating mode control method provided in an embodiment of the present invention; Figure 2 A schematic diagram illustrating the design logic and implementation process of a temperature-controlled power supply operating mode control method provided in an embodiment of the present invention; Figure 3A schematic diagram of a power supply whose operating mode is designed to be adjusted according to temperature, provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a power supply design circuit that adjusts the power supply operating mode according to temperature, as provided in an embodiment of the present invention. Detailed Implementation

[0011] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0012] This invention provides a method for temperature-dependent power supply operating mode control and a power supply.

[0013] Below, we will first introduce a method for controlling the operating mode of a power supply that is adjusted according to temperature, as provided in the embodiments of the present invention.

[0014] The present invention provides a method for temperature-dependent power supply operating mode control, such as... Figure 1 As shown, it may include the following steps: S1 monitors, samples, and provides feedback on the temperature of the power devices corresponding to each main power circuit in the main power array of the switching power supply circuit that are in operation in real time.

[0015] This invention takes the temperature of the main heat-generating components (power devices in the main power circuit) during the operation of a switching power supply circuit as its starting point, and designs a system for real-time monitoring, acquisition, and feedback of the temperature of the power devices in the switching power supply circuit for subsequent temperature judgment. The preset temperature threshold set can be determined based on the specifications of the power devices in the main power array and the power supply operating mode of the switching power supply circuit; the preset temperature threshold set may include: a first preset temperature threshold (Line1), a second preset temperature threshold (Line2), a third preset temperature threshold (Line3), a fourth preset temperature threshold (Line4), and a fifth preset temperature threshold (Line5).

[0016] S2, based on a preset temperature threshold group, comprehensively compares and determines the temperature of the power devices in the main power array under operating conditions, in order to design and select the power supply operating mode of the switching power supply circuit, which may include: When the first main power circuit in the main power array is in operation, the temperature of the power devices in the first main power circuit is compared with the first preset temperature threshold Line1. If the temperature of all power devices in the first main power circuit is less than the first preset temperature threshold Line1, the power supply operating mode is adjusted to asynchronous rectification mode. If the temperature of any power device in the first main power circuit is greater than or equal to the first preset temperature threshold Line1, the power supply operating mode is adjusted to synchronous rectification mode. When only the second main power circuit in the main power array is in operation, the temperature of the power devices in the second main power circuit is compared with the second preset temperature threshold Line2 and the third preset temperature threshold Line3 respectively. If the temperature of any power device in the second main power circuit is greater than the second preset temperature threshold Line2 and less than the third preset temperature threshold Line3, and the temperature of any power device is greater than or equal to the third preset temperature threshold Line3, the power supply operating mode is adjusted to synchronous rectification mode. If the temperature of all power devices in the second main power circuit is less than or equal to the second preset temperature threshold Line2, the power supply operating mode is adjusted to asynchronous rectification mode. If the temperature of any power device in the second main power circuit is greater than or equal to the third preset temperature threshold Line3, the power supply operating mode is adjusted to multiphase parallel mode. When the second and third main power circuits in the main power array are in operation, the temperatures of the power devices in the second and third main power circuits are compared with the fourth preset temperature threshold Line4 and the fifth preset temperature threshold Line5, respectively. If the temperature of any power device in the second and third main power circuits is greater than the fourth preset temperature threshold Line4 and less than the fifth preset temperature threshold Line5, and the temperature of any power device is greater than or equal to the fifth preset temperature threshold Line5, the power supply operating mode is adjusted to multi-phase parallel mode. If the temperature of all power devices in the second and third main power circuits is less than or equal to the fourth preset temperature threshold Line4, the power supply operating mode is adjusted to synchronous rectification mode. If the temperature of any power device in the second and third main power circuits is greater than or equal to the fifth preset temperature threshold Line5, the power supply operating mode is adjusted to power protection mode.

[0017] Specifically, the main power array may include: The circuit comprises a first main power circuit, a second main power circuit, and a third main power circuit; among which... The power devices in the first main power circuit are power MOSFET Q1 and power diode D1; The power devices in the second main power circuit are power MOSFET Q2 and power MOSFET Q3; The power devices in the third main power circuit are power MOSFET Q4 and power MOSFET Q5.

[0018] When only the first main power circuit is in operation, the temperatures of power MOSFET Q1 and power diode D1 are compared with the first preset temperature threshold Line1 in the preset temperature threshold group. If the temperatures of power MOSFET Q1 and power diode D1 are both less than the first preset temperature threshold Line1, the power supply operating mode is adjusted to asynchronous rectification mode. If the temperature of power MOSFET Q1 or power diode D1 is greater than or equal to the first preset temperature threshold Line1, the power supply operating mode is adjusted to synchronous rectification mode. When only the second main power circuit is in operation, the temperatures of power MOSFET Q2 and power MOSFET Q3 are compared with the second preset temperature threshold Line2 and the third preset temperature threshold Line3 in the preset temperature threshold group, respectively. If the temperature of power MOSFET Q2 or power MOSFET Q3 is greater than the second preset temperature threshold Line2 and less than the third preset temperature threshold Line3, and there is no temperature of Q2 or Q3 greater than or equal to the third preset temperature threshold Line3, the power supply operating mode is adjusted to synchronous rectification mode. If the temperatures of power MOSFET Q2 and power MOSFET Q3 are both less than or equal to the second preset temperature threshold Line2, the power supply operating mode is adjusted to asynchronous rectification mode. If the temperature of power MOSFET Q2 or power MOSFET Q3 is greater than or equal to the third preset temperature threshold Line3, the power supply operating mode is adjusted to multiphase parallel mode. When the second and third main power circuits are in operation, if the temperature of any of the power MOSFETs Q2, Q3, Q4, and Q5 is greater than the fourth preset temperature threshold Line4 and less than the fifth preset temperature threshold Line5, and there is no temperature greater than or equal to the fifth preset temperature threshold Line5, the power supply operating mode is controlled to multi-phase parallel mode. If the temperature of all the power MOSFETs Q2, Q3, Q4, and Q5 is less than or equal to the fourth preset temperature threshold Line4, the power supply operating mode is controlled to synchronous rectification mode. If the temperature of any of the power MOSFETs Q2, Q3, Q4, and Q5 is greater than or equal to the fifth preset temperature threshold Line5, the power supply operating mode is controlled to power protection mode.

[0019] The preset temperature threshold is a temperature threshold set based on the expected safe operating temperature of the corresponding main power device. By comparing the temperature of the power device with the preset temperature threshold, it reflects whether the temperature of the power device of interest is suitable under the current power supply operating mode. If the power device temperature is suitable, the current power supply operating mode of the switching power supply circuit is maintained; if it is not suitable, the corresponding power supply operating mode of the switching power supply circuit is adjusted. The preset temperature thresholds in the preset temperature threshold group can be designed so that the same preset temperature threshold is used for power devices in different main power circuits, or different preset temperature thresholds are used for power devices in each main power circuit.

[0020] S3, based on the selected power supply operating mode and corresponding logic operation, adjusts the output corresponding mode control signal, which may include: If the power supply is in asynchronous rectification mode, logic operation is used to output logic drive control EN1=H, EN2=L, EN3=L as the mode control signal corresponding to asynchronous rectification mode. If the power supply is in synchronous rectification mode, the logic drive control signals EN1=L, EN2=H, and EN3=L are output through logic operations as the mode control signals corresponding to the synchronous rectification mode. If the power supply is in a multi-phase parallel mode, logic operation is used to output logic drive control signals EN1=L, EN2=H, and EN3=H as the mode control signals corresponding to the multi-phase parallel mode. If the power supply is in the power protection mode, the logic drive control signals EN1=L, EN2=L, and EN3=L are output through logic operations as the mode control signals corresponding to the power protection mode.

[0021] Where H represents a high level and L represents a low level.

[0022] S4, based on the mode control signal, controls the operation of the corresponding main power circuit, and adjusts in real time to make the switching power supply circuit operate in a suitable power supply mode, which may include: If the mode control signals are high level EN1, low level EN2 and low level EN3, the first main power circuit is controlled by the drive control array, and the switching power supply is designed to operate in asynchronous rectification mode. If the mode control signals are low-level EN1, high-level EN2, and low-level EN3, the second main power circuit is controlled by the drive control array, and the switching power supply is designed to operate in synchronous rectification mode. If the mode control signals are low-level EN1, high-level EN2, and high-level EN3, the second and third main power circuits are controlled by the drive control array, and the switching power supply is designed to operate in multi-phase parallel mode. If the mode control signals are low-level EN1, low-level EN2, and low-level EN3, the first main power circuit, the second main power circuit, and the third main power circuit will all be deactivated by the drive control array. The switching power supply is designed to operate in power protection mode.

[0023] S5 monitors the temperature of power devices in real time and dynamically switches the power supply operating modes of the switching power supply circuit in a closed-loop manner; among which... The power supply operating modes of a switching power supply circuit design can include: asynchronous rectification mode, synchronous rectification mode, multiphase parallel mode, and power supply protection mode.

[0024] Understandably, the control method proposed in this embodiment of the invention takes the temperature of the main power device, which generates the most heat during the operation of the switching power supply, as its starting point. By monitoring, sampling, and feeding back the temperature of the power device, it designs a method for real-time monitoring of the temperature of the main power device under the current power supply operating mode. The monitored temperature is collected and converted into transmittable parameter data. A suitable power supply operating mode is selected by comparing and comprehensively judging the parameters converted from the temperature of the power device with a preset temperature threshold set according to the device parameters. The comparison result reflects the temperature suitability of the power device under the current power supply operating mode. Based on the comparison result, the switching power supply circuit is adjusted to operate in a suitable power supply operating mode. The adjustment is based on determining the next power supply operating mode according to the temperature suitability of the compared power device, with the main power device being adjusted. In this power supply array, the power devices in each main power circuit maintain their current operating mode when the device temperature is suitable. If the device temperature is unsuitable, the power supply's operating mode needs to be adjusted. Based on the previous stage's power supply operating mode determination and the control requirements of the next operating mode, a mode control signal corresponding to the power supply operating mode is output. The power supply's operating state is updated in real time, and the control method for the power devices in the main power circuit corresponding to the next power supply operating mode is designed. Based on the mode control signal from the previous stage, the power devices are turned on or off in real time, adjusting the power supply to operate in a more suitable operating mode for the device temperature. By monitoring the temperature in real time and adjusting the power supply's operating mode in a closed loop, the suitability of the power devices' current operating mode is fed back in real time, and further real-time adjustments are made. Therefore, this control method can adjust the power supply's operating mode in real time according to the temperature of the important main power devices in the power supply, ensuring the power supply operates in a suitable mode and the power devices operate at a suitable temperature, improving the reliability of operation under different temperatures, different power supplies, and different heating and temperature rise states of the main power devices. Simultaneously, real-time adjustment of the power supply's operation in different modes simplifies the power supply design or enhances its designed power output based on power supply power and ambient temperature, thereby improving the power supply's reliability under various operating conditions. Through power supply mode switching design, the reliability and design flexibility of the main power devices in the power supply are improved, adapting to appropriate adjustment of the power supply's operating mode according to different operating temperatures and power levels.

[0025] A schematic diagram illustrating the design logic and implementation process of a temperature-dependent power supply operating mode control method provided in this embodiment of the invention is shown below. Figure 2As shown, this control method monitors the temperature of the main power devices in real time, samples and transmits the temperature variables. It then compares the transmitted power device temperatures with preset temperature thresholds to determine the temperature rise status of the power devices and selects the power supply operating mode of the switching power supply circuit. Based on the selected operating mode, it switches the mode logic state and adjusts the corresponding mode control signal output. The method also adjusts the switching power supply circuit to operate in a suitable mode in real time based on the mode control signal. Through closed-loop real-time monitoring of the power device temperature, it controls whether the power supply operating mode of the switching power supply circuit switches based on the sampled temperature. A temperature sampling unit is designed and placed near the power devices in the switching power supply circuit to monitor the device temperature in real time and transmit the sampled temperature variables. A temperature data conversion unit converts the device temperatures sampled by the temperature sampling unit into analog parameter data. An analog parameter comparison unit compares the transmitted power device temperatures with preset temperature thresholds. Based on the analog parameter thresholds set for the expected suitable operating temperature of different power devices, it determines the temperature rise status of the power devices, confirms whether the current temperature mode of the power devices is suitable, outputs the corresponding level, and thus selects the corresponding power supply operating mode. Design corresponding logic gate operation units to switch logic states according to the selected power supply operating mode, control the corresponding driver to enable operation, and output the corresponding mode control signal. The operation logic of the logic gate operation unit can include: when the temperature of each power device is suitable, outputting the drive controller corresponding to the main power circuit of the current power supply operating mode to a high level, and the drive controller corresponding to the main power circuit of other power supply operating modes to a low level; correspondingly, when the temperature of each power device is unsuitable, outputting the drive controller corresponding to the main power circuit of the pre-switched power supply operating mode to a high level, and the drive controller corresponding to the main power circuit of other power supply operating modes to a low level, thereby adjusting the power supply operating mode of the switching power supply circuit in real time; design drive controllers corresponding to different power supply operating modes and corresponding main power circuits. The drive controllers have logic enable control functions and output drive control signals for the corresponding power devices under each power supply operating mode, so that the power devices work in the corresponding power supply operating mode. The closed-loop real-time monitoring of the power device temperature samples and compares variables. Based on the output level determined by the logic gate temperature, the drive controller is controlled to enable the power device to regularly turn on and off according to the control signal received from the drive controller. Based on the temperature of the power device in the current power supply operating mode, the power supply is adjusted to operate in a suitable power supply operating mode to maintain the current power supply operating mode or switch the power supply operating mode, thus completing the closed loop of the overall control method.

[0026] Understandably, the control method proposed in this invention takes the temperature of the high-heat-generating main power device as its design logic and practical starting point. It compares the real-time temperatures of key power devices in the switching power supply circuit with different power supply operating modes of the circuit, using digital high and low level signals to distinguish the suitability of temperature rise under power device operating conditions. Based on changes in the operating temperature of the power devices, it adjusts the power supply operating mode of the switching power supply circuit in real time, outputting corresponding mode control signals based on the temperature comparison results. This systematically controls the corresponding main power circuit to turn on or off, thereby controlling the power supply to operate in a suitable power supply operating mode. Thus, under different power supply operating modes, it optimizes the real-time temperature of the power devices, ensuring that each power device in the switching power supply circuit operates at a suitable temperature. This invention can simplify the power supply operating circuit and the number of devices in low-power or low-temperature applications; for example, it can adjust the power supply to operate in asynchronous rectification mode under low-power conditions; simultaneously, when it is necessary to improve the high-temperature reliability of power devices, it can determine, based on temperature acquisition, that the switching power supply circuit operates in synchronous rectification mode or multi-phase parallel power supply mode. Meanwhile, the control method proposed in this embodiment of the invention can adjust the power supply in real time when the actual operating temperature or power changes, so that the power supply and power devices can work in a more suitable power supply operating mode, and the power supply is more applicable to various operating conditions such as temperature and power changes.

[0027] The control method proposed in this invention can flexibly adjust the power supply's operating mode under conditions such as power changes and ambient temperature changes in actual application of the switching power supply, thereby improving the reliability of power devices in the power supply. At the same time, it can regulate the switching power supply circuit and power devices to operate under suitable power supply operating modes, simplifying the power supply design, or increasing the number of operating power devices, enhancing the power design of the switching power supply circuit, and comprehensively improving the reliability of the power supply. It is applicable to different temperature environments and different power applications, and is also applicable to situations where the power supply's operating temperature or power changes dynamically, making it suitable for scenarios that require flexible adjustment of the power supply's operating mode.

[0028] Secondly, corresponding to the above method embodiments, this invention also provides a power supply with temperature-controlled power supply operating modes, such as... Figure 3 As shown, it may include: The system includes a drive control array, a main power array, a sampling feedback array, a temperature comparison and determination array, and a digital logic processing circuit; among which, The drive control array is used to control the corresponding main power circuit in the main power array to operate according to the received modal control signals; The main power array is designed to operate in a suitable power supply mode and output the corresponding power supply voltage under the control of the drive control array. The power supply operating modes include: asynchronous rectification mode, synchronous rectification mode, multiphase parallel mode, and power supply protection mode. A sampling feedback array is used to monitor, sample, and provide feedback on the temperature of the corresponding power devices in the main power circuit when it is in operation. The temperature comparison and determination array is used to comprehensively compare and determine the temperature of power devices in the main power circuit that is in operation based on a preset temperature threshold group, and output the comparison result. The digital logic processing circuit is used to comprehensively process the comparison results and output the corresponding mode control signal for the power supply operating mode design.

[0029] In the power supply, the input terminal of the drive control array is connected to the output terminal of the digital logic processing circuit, and the drive control terminal is connected to the control terminal of the main power array; the input terminal of the main power array is connected to the external power supply voltage, and the output terminal serves as the output of the designed power supply; the sampling terminal of the sampling feedback array is connected to the power devices of each main power circuit in the main power array, and the output terminal is connected to the inverting input terminal of the temperature comparison and determination array; the positive input terminal of the temperature comparison and determination array is connected to the reference voltage corresponding to the preset temperature threshold, and the output terminal is connected to the input terminal of the digital logic processing circuit.

[0030] This power supply collects the temperature of the power devices in the main power array, compares and processes these temperatures to design and select the power supply operating mode of the switching power supply circuit, and generates a mode control signal to regulate the power supply operating mode. The drive control array then manipulates the corresponding main power array to operate in the power supply operating mode corresponding to the received mode control signal. The temperature of the power devices in the main power array is monitored in real time under different power supply operating modes, thereby controlling and adjusting the power supply's different operating modes to achieve closed-loop control and real-time adjustment of the power supply's operating modes.

[0031] Understandably, the embodiments of this invention provide a closed-loop control for the proposed power supply design. By monitoring the temperature of the power devices, the power supply is adjusted to operate in different power supply operating modes, thereby optimizing the operating temperature of the power devices and improving their reliability. This power supply exhibits high adaptability to changes in operating power and ambient temperature. While improving the reliability of the power devices, it can optimize the power supply operating modes according to changes in power and environment, enabling the power supply design to operate in a more suitable state.

[0032] from Figure 3 As can be seen, the drive control array may include: a first drive controller, a second drive controller, and a third drive controller. The main power array may include: a first main power circuit, a second main power circuit, and a third main power circuit. The sampling feedback array may include: a first sampling feedback group, a second sampling feedback group, and a third sampling feedback group.

[0033] Specifically, the first main power circuit, such as Figure 4 As shown, it may include: Power MOSFET Q1, power diode D1, and power inductor L1; The gate of power MOSFET Q1 serves as the control terminal of the first main power circuit, the source is connected to the cathode of power diode D1, and the drain is connected to the external power supply voltage. The anode of power diode D1 is grounded, and the cathode is connected to one end of power inductor L1; The other end of the power inductor L1 serves as the output terminal of the first main power circuit. Second main power circuit, such as Figure 4 As shown, it may include: Power MOSFET Q2, power MOSFET Q3 and power inductor L2; The gate of power MOSFET Q2 serves as the first control terminal of the second main power circuit, and its source is connected to the drain of power MOSFET Q3, with the drain connected to an external power supply voltage. The gate of power MOSFET Q3 serves as the second control terminal of the second main power circuit, the drain is connected to one end of power inductor L2, and the source is grounded. The other end of the power inductor L2 serves as the output terminal of the second main power circuit. The third main power circuit, such as Figure 4 As shown, it may include: Power MOSFET Q4, power MOSFET Q5, and power inductor L3; The gate of power MOSFET Q4 serves as the first control terminal of the third main power circuit, and its source is connected to the drain of power MOSFET Q5, with the drain connected to an external power supply voltage. The gate of power MOSFET Q5 serves as the second control terminal of the third main power circuit, the drain is connected to one end of power inductor L3, and the source is grounded. The other end of the power inductor L3 serves as the output terminal of the third main power circuit.

[0034] Drive control array, such as Figure 4 As shown, it may include: First drive controller U1, second drive controller U2, third drive controller U3; wherein... The input terminal of the first drive controller is connected to the first output terminal of the digital logic operation processing circuit, and the drive control terminal is connected to the gate of the power MOSFET Q1 in the first main power circuit. The input terminal of the second drive controller is connected to the second output terminal of the digital logic operation processing circuit, the first drive control terminal is connected to the gate of the power MOSFET Q2 in the second main power circuit, and the second drive control terminal is connected to the gate of the power MOSFET Q3 in the second main power circuit. The input terminal of the third drive controller is connected to the third output terminal of the digital logic operation processing circuit, the first drive control terminal is connected to the gate of the power MOSFET Q4 in the third main power circuit, and the second drive control terminal is connected to the gate of the power MOSFET Q5 in the third main power circuit.

[0035] The drive control array controls the corresponding main power circuit in the main power array to operate according to the received mode control signal, and may include: The drive control array controls the first main power circuit in the main power array to operate in the asynchronous rectification mode according to the mode control signal corresponding to the asynchronous rectification mode. The drive control array controls the second main power circuit in the main power array to operate in the synchronous rectification mode according to the mode control signal corresponding to the synchronous rectification mode. The drive control array controls the second and third main power circuits in the main power array to operate in multi-phase parallel mode according to the mode control signals corresponding to the multi-phase parallel mode. The drive control array controls the first main power circuit, the second main power circuit, and the third main power circuit in the main power array to not operate according to the mode control signal corresponding to the power protection mode.

[0036] One end of the first drive controller U1, the second drive controller U2, and the third drive controller U3 are respectively connected to one end of the first main power circuit, the second main power circuit, and the third main power circuit in the main power array, and the other end is connected to one end of the digital logic processing circuit. The other end of the first main power circuit is connected to one end of the first sampling feedback group; the other end of the second main power circuit is connected to one end of the second sampling feedback group; the other end of the third main power circuit is connected to one end of the third sampling feedback group; and the other ends of the first, second, and third sampling feedback groups are connected to one end of the temperature comparison and determination array. The other end of the temperature comparison and determination array is connected to one end of the digital logic processing circuit. The sampling feedback array, as the source of external information and regulation in the control circuit proposed in this embodiment, can be composed of temperature sensing and data conversion circuits, corresponding to the sampling of different power devices. The temperature comparison and determination array, as the data processing unit of the control method, can be composed of data parameter comparison circuits, corresponding to temperature data comparison. The digital logic processing circuit, as the logic processing unit of the control method, can be composed of logic operation circuits, corresponding to the switching control of the power supply operating mode. The drive control array is used to realize the switching of different power supply operating modes and can be composed of power device drive control circuits.

[0037] The power supply proposed in this invention receives temperature information from a control source and converts it into temperature data. It senses the temperature changes of the controlled power devices under different power supply operating modes. The converted temperature data of the corresponding power device is compared with a preset temperature threshold to confirm the power supply operating mode. The confirmed operating mode is input to a digital logic processing circuit to form a mode control signal for switching the power supply operating mode. The drive control array controls the corresponding main power circuit in the main power array to operate according to the received mode control signal and the corresponding control command. Under different power supply operating modes, the temperature of the power devices in the controlled main power circuit is monitored in real time, thereby completing the control and adjustment of different power supply operating modes. This achieves closed-loop and real-time control of the overall power supply operating mode adjusted according to temperature. By monitoring the temperature of the power devices in the main power circuit in real time and adjusting the power supply operating mode, the operating temperature of the power devices in the power supply is optimized, improving the reliability of the power devices. This power supply is fully executable, enabling real-time monitoring of the temperature of power devices under different power supply operating modes and achieving closed-loop regulation of the power supply operating modes. It can adjust the power supply operating modes in real time to meet the temperature changes of power devices caused by power supply power variations or ambient temperature variations, and optimize the switching power supply for appropriate switching under unsuitable operating conditions. The switching power supply has high adaptability to power and ambient temperature variations, improving the reliability of power devices in the switching power supply while optimizing the power supply operating modes according to power and ambient temperature changes, allowing the switching power supply to operate in a more suitable power supply operating mode in real time.

[0038] In the drive control array, the first drive controller is used to receive the enable signal EN1 in the mode control signal to control whether the first main power circuit in the main power array works according to the design mode; The second drive controller is used to receive the enable signal EN2 in the mode control signal to control whether the second main power circuit in the main power array works according to the design mode; The third drive controller is used to receive the enable signal EN3 in the mode control signal to control whether the third main power circuit in the main power array works according to the design mode.

[0039] The three main power circuits share a common power input terminal and a common power output terminal. Specifically, the drains of power MOSFET Q1 in the first main power circuit, power MOSFET Q2 in the second main power circuit, and power MOSFET Q4 in the third main power circuit are connected together as the input terminal of the designed power supply. The other ends of power inductors L1, L2, and L3 in the first, second, and third main power circuits are connected together and connected to the power output terminal as the power supply output terminal.

[0040] First sampling feedback group, such as Figure 4 As shown, it may include: temperature sensor U4 and temperature sensor U5. The second sampling feedback group, as... Figure 4 As shown, it may include: temperature sensor U6 and temperature sensor U7. The third sampling feedback group, as... Figure 4 As shown, it may include: temperature sensor U8 and temperature sensor U9.

[0041] Specifically, in the power supply proposed in this embodiment of the invention, temperature sensor U4 is placed near power MOSFET Q1 in the first main power circuit, and the temperature of Q1 is used as the input of U4. Similarly, temperature sensors U5, U6, U7, U8 and U9 are placed near power diode D1, power MOSFET Q2, power MOSFET Q3, power MOSFET Q4 and power MOSFET Q5, respectively, to sample the device temperatures of D1, Q2, Q3, Q4 and Q5 and convert them into corresponding analog data, which are then output by the output terminal of the corresponding temperature sensor.

[0042] Temperature comparison and determination array, such as Figure 4 As shown, it may include: a first comparator group, a second comparator group, and a third comparator group; wherein, The first comparator group may include comparator U10 and comparator U11; The second comparator group may include comparator U12 and comparator U13; The third comparator group may include comparator U14 and comparator U15; The positive input terminal of comparator U10 is connected to the reference voltage corresponding to the preset temperature threshold, the inverting input terminal is connected to the output terminal of temperature sensor U4, and the output terminal is connected to the first input terminal of digital logic operation and processing circuit. The positive input terminal of comparator U11 is connected to the reference voltage corresponding to the preset temperature threshold, the inverting input terminal is connected to the output terminal of temperature sensor U5, and the output terminal is connected to the second input terminal of digital logic operation and processing circuit. The positive input terminal of comparator U12 is connected to the reference voltage corresponding to the preset temperature threshold, the inverting input terminal is connected to the output terminal of temperature sensor U6, and the output terminal is connected to the third input terminal of digital logic processing circuit. The positive input terminal of comparator U13 is connected to the reference voltage corresponding to the preset temperature threshold, the inverting input terminal is connected to the output terminal of temperature sensor U7, and the output terminal is connected to the fourth input terminal of digital logic processing circuit. The positive input terminal of comparator U14 is connected to the reference voltage corresponding to the preset temperature threshold, the inverting input terminal is connected to the output terminal of temperature sensor U8, and the output terminal is connected to the fifth input terminal of digital logic processing circuit. The positive input terminal of comparator U15 is connected to the reference voltage corresponding to the preset temperature threshold, the inverting input terminal is connected to the output terminal of temperature sensor U9, and the output terminal is connected to the sixth input terminal of digital logic processing circuit.

[0043] The outputs of comparators U10, U11, U12, U13, U14, and U15 are connected to the first input IN1, second input IN2, third input IN3, fourth input IN4, fifth input IN5, and sixth input IN6 of the digital logic processing circuit U16, respectively. The first output OUT1 of the digital logic processing circuit U16 is connected to the input of the first drive controller U1, the second output OUT2 is connected to the input of the second drive controller U2, and the third output OUT3 is connected to the input of the third drive controller U3. A high-level signal from the output of the digital logic processing circuit U16 enables the corresponding drive controller to operate normally, while a low-level signal disables the corresponding drive controller. Depending on the different enable control states of the drive controllers, the corresponding main power circuits are controlled to operate independently or collaboratively.

[0044] The temperature comparison and determination array performs a comprehensive comparison and determination of the temperature of power devices in the main power circuit under operation based on a preset temperature threshold group, and outputs the comparison result, which may include: When the first main power circuit in the main power array is in operation, the temperature comparison and determination array compares the temperature of power MOSFET Q1 and power diode D1 according to the first preset temperature threshold Line1 in the preset temperature threshold group. If the temperature of both Q1 and D1 is less than Line1, the comparison result corresponding to the asynchronous rectification mode is output; if the temperature of Q1 or D1 is greater than or equal to Line1, the comparison result corresponding to the synchronous rectification mode is output. When only the second main power circuit in the main power array is in operation, the temperature comparison array compares the temperatures of power MOSFETs Q2 and Q3 according to the second preset temperature threshold Line2 and the third preset temperature threshold Line3 in the preset temperature threshold group. If the temperature of Q2 or Q3 is greater than Line2 and less than Line3, and there is no temperature of Q2 or Q3 greater than or equal to Line3, the comparison result corresponding to the synchronous rectification mode is output; if the temperatures of Q2 and Q3 are both less than or equal to Line2, the comparison result corresponding to the asynchronous rectification mode is output; if the temperature of Q2 or Q3 is greater than or equal to Line3, the comparison result corresponding to the multiphase parallel mode is output. When the second and third main power circuits in the main power array are in operation, the temperature comparison array compares the temperatures of power MOSFETs Q2, Q3, Q4, and Q5 according to the fourth preset temperature threshold Line4 and the fifth preset temperature threshold Line5. If any of the temperatures of Q2, Q3, Q4, and Q5 is greater than Line4 and less than Line5, and no temperature of Q2, Q3, Q4, or Q5 is greater than or equal to Line5, the comparison result corresponding to the multiphase parallel mode is output. If the temperatures of Q2, Q3, Q4, and Q5 are all less than or equal to Line4, the comparison result corresponding to the synchronous rectification mode is output. If any of the temperatures of Q2, Q3, Q4, and Q5 is greater than or equal to Line5, the comparison result corresponding to the power protection mode is output.

[0045] The digital logic processing circuit synthesizes and compares the results, outputting the corresponding power supply mode control signal for the power mode design.

[0046] The power supply with temperature-controlled operating mode proposed in this embodiment of the invention can include three main power circuits. These three main power circuits can operate independently or interconnectedly and collaboratively. The first main power circuit can employ a asynchronous rectification design corresponding to power diode D1, while the second and third main power circuits employ synchronous rectification designs corresponding to power MOSFET Q3 and power MOSFET Q5, respectively. This temperature-controlled power supply operates based on the temperature of the power devices in the main power array. Temperature sensors U4, U5, U6, U7, U8, and U9, located near the power devices, collect the device temperatures of the corresponding power MOSFET Q1, power diode D1, power MOSFET Q2, power MOSFET Q3, power MOSFET Q4, and power MOSFET Q5 in real time, converting the corresponding device temperatures into corresponding temperature simulation data output. Lines 1, 2, 3, 4, and 5 are set according to the expected device operating temperatures of power MOSFET Q1, power diode D1, power MOSFET Q2, power MOSFET Q3, power MOSFET Q4, and power MOSFET Q5 for subsequent comparison stages. During the comparison phase, comparators U10, U11, U12, U13, U14, and U15 compare the temperatures of power MOSFET Q1, power diode D1, power MOSFET Q2, power MOSFET Q3, power MOSFET Q4, and power MOSFET Q5 with their preset temperature thresholds. The comparison results can include: the power device operating temperature is suitable, or the power device operating temperature is unsuitable (the power device operating temperature is below the preset lower lower threshold, or the power device operating temperature is above the preset upper threshold). The digital logic processing circuit outputs corresponding modal control signals based on the comparison results. These modal control signals are either high-level or low-level signals, used to enable the first drive controller U1, the second drive controller U2, and the third drive controller U3. Specifically, when one of the modal control signals is high-level, the corresponding drive controller operates normally; when the corresponding enable signal is low-level, the corresponding drive controller stops operating. Based on the different enable states of each drive controller, the main power circuits corresponding to each drive controller are controlled to operate independently or collaboratively.When the first main power circuit operates alone, and the second and third main power circuits are not operating, the power supply operates in asynchronous rectification mode. When the second main power circuit operates alone, and the first and third main power circuits are not operating, the power supply operates in synchronous rectification mode. When the second and third main power circuits operate together, and the first main power circuit is not operating, the power supply operates in multi-phase parallel mode. When all three main power circuits are not operating, the power supply operates in power protection mode. Each drive controller controls the operation of each main power circuit according to the corresponding mode control signal, thus realizing the output of the switching power supply. The power supply can continuously collect the temperature of the power devices in the main power circuits. When the operating temperature or power of the switching power supply circuit changes, it continuously monitors and adjusts the switching power supply circuit to operate in different power modes, always ensuring that the power devices in the switching power supply circuit operate in a suitable state.

[0047] Understandably, the power supply proposed in this embodiment of the invention optimizes the operating temperature of power devices while switching power supply operating modes, thereby improving the reliability of each device. When the power supply operates in environments with varying operating temperatures, variable ambient temperatures, or changes in the actual operating power of the switching power supply circuit, causing corresponding temperature changes in the power devices, the power supply's operating mode is confirmed by real-time monitoring of the power device temperature. A mode control signal is then output to control the switching power supply to operate in the corresponding mode, ensuring that the power devices are in a suitable operating state in real time, thus improving the reliability of the switching power supply. Simultaneously, the architecture of the power devices in the switching power supply is simplified under different temperatures and power requirements, making it suitable for various operating scenarios. The asynchronous rectification mode is suitable for lower power or lower ambient temperature environments, the synchronous rectification mode is suitable for medium power or medium ambient temperature environments, and the multiphase parallel mode is suitable for higher power or higher ambient temperature environments. When the power of the switching power supply is too high or the temperature of the power devices is too high, the power supply enters protection mode, stopping the operation of the switching power supply and protecting it. By monitoring and providing feedback on the temperature of the corresponding power devices in real time, the operating state of the switching power supply circuit can be adjusted accordingly, making it highly applicable to various complex working conditions.

[0048] The power supply proposed in this embodiment monitors and compares the temperature of the power devices in the main power circuit under the current power supply operating mode, and outputs a corresponding mode control signal. Specifically, during the comparison, the temperature of the power device collected in the control circuit is T, and a preset temperature threshold group corresponding to the power device can be set, including Line1, Line2, Line3, Line4, and Line5; the power supply operating mode of the switching power supply circuit is determined based on the comparison result of T with Line1, Line2, Line3, Line4, and Line5; based on the mode control signal, the switching power supply is controlled to operate in asynchronous rectification mode Mode1, synchronous rectification mode Mode2, multiphase parallel mode Mode3, or power protection mode Mode4. The power supply regulation strategy proposed in this embodiment is shown in Table 1, Power Supply Operating Mode Regulation Table: Table 1 Power Supply Operating Mode Control Table

[0049] As shown in Table 1, the mode control signals can include EN1, EN2, and EN3. If EN1=H, EN2=L, and EN3=L, the switching power supply is designed to operate in asynchronous rectification mode; if EN1=L, EN2=H, and EN3=L, the switching power supply is designed to operate in synchronous rectification mode; if EN1=L, EN2=H, and EN3=H, the switching power supply is designed to operate in multiphase parallel mode; if EN1=L, EN2=L, and EN3=L, the switching power supply is designed to operate in power protection mode. Here, H is a high level that enables the drive controller in the power supply, and L is a low level that disables the drive controller in the power supply. When the power supply is working, it is currently operating in asynchronous rectification mode, and the power devices collected and compared are power MOSFET Q1 and power diode D1; it is currently operating in synchronous rectification mode, and the power devices collected and compared are power MOSFET Q2 and power MOSFET Q3; it is currently operating in multiphase parallel mode, and the power devices collected and compared are power MOSFET Q2, power MOSFET Q3, power MOSFET Q4 and power MOSFET Q5.

[0050] The specific process of comprehensively comparing and determining the temperature of power devices in the main power array under operating conditions based on a preset temperature threshold group, in order to design and select the power supply operating mode of the switching power supply circuit, may include: When the current switching power supply operates in the asynchronous rectification mode, the preset temperature threshold for the operation of the power device is set to Line1. Compare the respective temperatures T of the current sampled power MOSFET Q1 and power diode D1 with Line1. If T < Line1, the current operating temperatures of the power MOSFET Q1 and the power diode D1 are both lower than Line1, and the switching power supply circuit should maintain the current power supply operating mode; if T ≥ Line1, the operating temperature of the power MOSFET Q1 or the power diode D1 is higher than Line1, and the switching power supply should be switched to the synchronous rectification mode.

[0051] When the current switching power supply operates in the synchronous rectification mode, the preset temperature thresholds for the operation of the power device are set to Line2 and Line3. Compare the respective temperatures T of the current sampled power MOSFET Q2 and power MOSFET Q3 with Line2 and Line3. If Line2 < T < Line3, the temperature of the power MOSFET Q2 or the power MOSFET Q3 is between Line2 and Line3, and there is no temperature of the power MOSFET Q2 or the power MOSFET Q3 higher than Line3, the switching power supply should maintain the current power supply operating mode; if T ≤ Line2, the temperatures of the power MOSFET Q2 and the power MOSFET Q3 are both less than or equal to Line2, and the switching power supply should be switched to the asynchronous rectification mode; if T ≥ Line3, the temperature of the power MOSFET Q2 or the power MOSFET Q3 is greater than or equal to Line3, and the switching power supply should be switched to the multi-phase parallel mode.

[0052] When the current switching power supply operates in the multi-phase parallel mode, the preset temperature thresholds for the power devices to operate are set as Line1 and Line2. Compare the respective temperatures T of the current sampled power MOSFET Q2, power MOSFET Q3, power MOSFET Q4, and power MOSFET Q5 with Line4 and Line5. If Line4 < T < Line5, among the temperatures of power MOSFET Q2, power MOSFET Q3, power MOSFET Q4, and power MOSFET Q5, any one temperature is between Line4 and Line5, and there is no temperature higher than Line5, the switching power supply should maintain the current power supply operating mode; if T ≤ Line4, the temperatures of power MOSFET Q2, power MOSFET Q3, power MOSFET Q4, and power MOSFET Q5 are all less than or equal to Line4, the switching power supply should switch to the synchronous rectification mode; if T ≥ Line5, among the temperatures of power MOSFET Q2 and power MOSFET Q3, power MOSFET Q4, and power MOSFET Q5, any one temperature is greater than or equal to Line5, the switching power supply should switch to the power protection mode. The modal control signals corresponding to the non-synchronous rectification mode are EN1 = H, EN2 = L, EN3 = L; the modal control signals corresponding to the synchronous rectification mode are EN1 = L, EN2 = H, EN3 = L; the modal control signals corresponding to the multi-phase parallel mode are EN1 = L, EN2 = H, EN3 = H; the modal control signals corresponding to the power protection mode are EN1 = L, EN2 = L, EN3 = L.

[0053] It can be understood that the power supply proposed in the embodiment of the present invention controls the operation of the first main power circuit in the non-synchronous rectification mode and uses diode rectification. This mode is suitable for working conditions with low temperature rise and small power; in the synchronous rectification mode, it controls the operation of the second main power circuit and uses MOSFET rectification, which is suitable for working conditions with medium temperature rise and medium power; in the multi-phase parallel mode, it controls the operation of the second main power circuit and the third main power circuit and uses multiple main power circuits in parallel operation, which is suitable for working conditions with high temperature rise and high power; in the power protection mode, the power supply will turn off all the main power circuits and take a protection state, which is suitable for working conditions with excessive device temperature rise and excessive power consumption of the power supply. Whether to switch the power supply operating mode specifically depends on the comparison between the sampled temperature of the power device and the preset temperature threshold. When the current power supply operating mode is the non-synchronous rectification mode, the non-synchronous rectification mode can be maintained or switched to the synchronous rectification mode; when the current power supply operating mode is the synchronous rectification mode, the synchronous rectification mode can be maintained, or switched to the non-synchronous rectification mode, or switched to the multi-phase parallel mode; when the current power supply operating mode is the multi-phase parallel mode, the multi-phase parallel mode can be maintained, or switched to the synchronous rectification mode or switched to the power protection mode.

[0054] Specifically, the power supply proposed in this embodiment of the invention samples the temperature of the power devices in the main power array under the current power supply operating mode and compares it with the preset expected suitable operating temperature of the power devices to distinguish the suitable operating temperature of the power devices in the main power circuit of the power supply. For example, when the current power supply operating mode is asynchronous rectification mode, the power devices Q1 and D1 in the expected main power circuit are set to have a first preset temperature threshold Line1. Line1 is the highest working device temperature under asynchronous rectification mode. If the temperature data of Q1 and D1 are both lower than Line1, it is determined that the operating temperature of Q1 and D1 is suitable. The logic drives EN1=H, EN2=L, and EN3=L as the mode control signals corresponding to asynchronous rectification mode. Based on the mode control signals, the corresponding main power circuit is controlled to work, so that the switching power supply circuit works in asynchronous rectification mode, that is, the current asynchronous rectification mode is maintained. The temperature of the power devices meets the operating temperature limit of asynchronous rectification mode devices. The asynchronous rectification mode with D1 rectification continues to be executed, and the first main power circuit in the main power array is controlled to be in working state. At this time, it is in the condition of low device temperature, low ambient temperature, or low actual power consumption of the power supply. Correspondingly, if the temperature of Q1 or D1 is higher than Line1, it is determined that the operating temperature of Q1 and D1 is unsuitable. The output logic drives EN1=L, EN2=H, and EN3=L as the mode control signals corresponding to the synchronous rectification mode. Based on the mode control signals, the corresponding main power circuit is controlled to work, so that the switching power supply circuit works in the synchronous rectification mode, that is, the power supply working mode is switched to the synchronous rectification mode. If the temperature of the power devices in the main power array does not meet the operating temperature limit of the non-synchronous rectification mode devices, the synchronous rectification mode with Q3 rectification is executed, and the second main power circuit is controlled to work, increasing the power used by the power supply. At this time, the device temperature rise does not meet the expected non-synchronous rectification mode design, or the ambient temperature rises or the actual power used by the power supply increases.

[0055] When the current power supply operating mode is synchronous rectification mode, the expected power devices Q2 and Q3 are set to have Line3 and Line2. Line3 is the highest working temperature of the device under synchronous rectification mode, and Line2 is the suitable operating temperature of the device under synchronous rectification mode. If the temperature data of Q2 and Q3 is lower than the designed Line3 and higher than Line2, but not higher than the designed Line3, it is determined that the operating temperature of Q2 and Q3 is suitable for the operating temperature of the device under synchronous rectification mode. The logic drive control EN1=L, EN2=H, EN3=L is used as the mode control signal corresponding to the synchronous rectification mode to control the power supply to work in synchronous rectification mode, that is, to maintain the current synchronous rectification mode. The temperature of the power device meets the operating temperature limit of the synchronous rectification mode device, and continues to execute the synchronous rectification mode with Q3 rectification. The second main power circuit is controlled to work. At this time, the device temperature is suitable, the ambient temperature is moderate, or the actual power consumption of the power supply is suitable for the synchronous rectification power supply design conditions. If the temperature data of Q2 and Q3 are both lower than Line2, it is determined that the operating temperature of Q2 and Q3 is low. At this time, the power supply design can be simplified, and the output logic drive control EN1=H, EN2=L, EN3=L can be used as the mode control signal corresponding to the asynchronous rectification mode to control the power supply to work in the asynchronous rectification mode, that is, switch the power supply working mode to the asynchronous rectification mode. If the temperature data of Q2 or Q3 is higher than Line3, it is determined that the operating temperature of Q2 and Q3 is unsuitable. The output logic drives EN1=L, EN2=H, and EN3=H as the mode control signals corresponding to the multiphase parallel mode, controlling the power supply to operate in the multiphase parallel mode, that is, switching the power supply operating mode to the multiphase parallel mode. The temperature of the power devices does not meet the operating temperature limit of the synchronous rectification mode devices, and the multiphase parallel mode of multiple main power circuits is executed, controlling the second and third main power circuits to work, further increasing the power consumption design of the power supply. At this time, the device temperature rise does not meet the expected temperature of the synchronous rectification mode, the ambient temperature continues to rise, or the actual power consumption of the power supply continues to increase.

[0056] When the current power supply operating mode is multiphase parallel mode, the expected power devices Q2, Q3, Q4, and Q5 are set to have Line5 and Line4. Line5 is the highest operable device temperature under multiphase parallel mode, and Line4 is the suitable operating temperature of the device under multiphase parallel mode. If the temperature data of Q2, Q3, Q4, and Q5 are lower than the designed Line5 but higher than Line4, and there are no devices with temperatures higher than the designed Line5, then it is determined that the operating temperature of Q2, Q3, Q4, and Q5 is suitable for the operating temperature of the device under multiphase parallel mode. The logic drive control EN1=L, EN2=H, and EN3=H are output as the mode control signals corresponding to the multiphase parallel mode, controlling the power supply to operate in multiphase parallel mode, that is, maintaining the current multiphase parallel mode. The power device temperature meets the operating temperature limit of the device under multiphase parallel mode, and the multiphase parallel mode continues to be executed, controlling the second main power circuit and the third main power circuit to work. If the temperature data of Q2, Q3, Q4, and Q5 are all lower than Line 4, then the operating temperatures of Q2, Q3, Q4, and Q5 are low. In this case, a simplified power supply design can be chosen, and the output logic drives EN1=L, EN2=H, and EN3=L as the mode control signals corresponding to the synchronous rectification mode, controlling the power supply to operate in synchronous rectification mode, i.e., switching the power supply operating mode to synchronous rectification mode. If any of the temperature data of Q2, Q3, Q4, and Q5 is higher than Line 5, then it is determined that the operating temperatures of Q2, Q3, Q4, and Q5 are unsuitable. The output logic drives EN1=L, EN2=L, and EN3=L as the mode control signals corresponding to the power supply protection mode, controlling the shutdown of all main power circuits, i.e., switching the power supply operating mode to power supply protection mode, protecting the power devices and power circuits. This is a condition where the device temperature rise does not meet the expected temperature of the multi-phase parallel mode, the ambient temperature continues to rise, or the actual power consumption of the power supply continues to increase, exceeding the power supply design power limit.

[0057] Understandably, the reliable operation of power devices is a crucial factor in the reliable operation of a switching power supply. This invention focuses on the power devices within a switching power supply. Based on the operating principle of a switching power supply, it is known that the temperature of the power devices increases with the power consumption or ambient temperature. To ensure long-term reliable operation, the temperature of the power devices needs to be maintained within a suitable operating range. Depending on the power consumption, different switching power supplies require different designs and have varying degrees of complexity. Typically, the output power can be increased by increasing the number of power devices, while the number can be reduced in low-power applications. Therefore, there is an inverse relationship between the number of power devices and the power consumption in a switching power supply. Furthermore, the increasing complexity of the circuit places even higher demands on the reliability of the power supply design. For scenarios where the actual power consumption and operating temperature of a switching power supply vary and require flexible adjustment, this invention uses a sampling and conversion method to monitor the operating temperature of the power devices in real time. By comparing the operating temperature range of the power devices with the ideal range, it determines the suitability of the power device temperatures during the current operation of the switching power supply. This allows for further adjustment of the suitability of the current switching power supply's operating mode. The switching power supply can be designed to operate in a low-temperature-rise, low-power asynchronous rectification mode using diode rectification; a medium-temperature-rise, medium-power synchronous rectification mode using power MOSFET rectification; a high-temperature-rise, high-power multiphase parallel mode with multiple power circuits connected in parallel; or a power protection mode. Based on the temperature suitability determination of the power devices in the previous stage, the design determines whether the operating mode of the power devices is suitable under the current power supply operating mode and outputs a corresponding mode control signal to control the switching of the power supply's operating mode. Specifically, when the operating temperature of the power devices is suitable, the current power supply operating mode and main power circuit design are maintained. When the temperature of the power devices rises, the power supply switches to a main power circuit with increased power or a power supply operating mode with more power devices, thereby regulating and reducing the temperature of the power devices. Conversely, when the operating temperature of the power devices decreases, the power supply switches to a main power circuit with reduced power or a power supply operating mode with fewer power devices. This embodiment of the invention can adapt to changes in the environment and power used by the power supply, dynamically adjusting the temperature of the power devices and the power supply operating mode, thus dynamically controlling the power supply's operation and making it more adaptable to different operating temperatures and power conditions.In power supply design, design redundancy can be avoided by using a consistent power supply operating mode. When the power consumption or operating temperature of the power supply decreases, the power supply can be adjusted to operate in a relatively simple power supply operating mode, optimizing the power supply's operating design in low-power applications. When the power consumption or operating temperature increases, the power supply operating mode design can be adjusted to optimize the temperature rise of power devices, enhance the reliability of the power supply design, and improve the overall flexibility and reliability of the power supply in use and design under different operating conditions.

[0058] It should be noted that, in the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A method for temperature-dependent power supply operating mode control, characterized in that, include: Real-time monitoring, sampling, and feedback of the temperature of the power devices corresponding to each main power circuit in the main power array of the switching power supply circuit that is in operation; The temperature of the power devices in the main power array under working condition is comprehensively compared and determined based on the preset temperature threshold group in order to design and select the power supply working mode of the switching power supply circuit. Adjust the corresponding mode control signal of the output according to the power supply operating mode selected in the design and the corresponding logic operation. Based on the mode control signal, the corresponding main power circuit is controlled to work, and the switching power supply circuit is adjusted in real time to work in a suitable power supply mode. Real-time monitoring of the temperature of power devices in the main power array, and closed-loop control of the dynamic switching of the power supply operating modes of the switching power supply circuit; among which, The power supply operating modes of switching power supply circuit design include: asynchronous rectification mode, synchronous rectification mode, multiphase parallel mode, and power supply protection mode.

2. The method for temperature-dependent power supply operating mode control according to claim 1, characterized in that, The preset temperature threshold group is determined based on the specifications of the power devices in the main power array and the power supply operating mode of the switching power supply circuit; the preset temperature threshold group includes: first preset temperature threshold Line1, second preset temperature threshold Line2, third preset temperature threshold Line3, fourth preset temperature threshold Line4 and fifth preset temperature threshold Line5.

3. The method for temperature-dependent power supply operating mode control according to claim 2, characterized in that, The step of comprehensively comparing and determining the temperature of power devices in the main power array under operating conditions based on a preset temperature threshold group, in order to design and select the power supply operating mode of the switching power supply circuit, includes: When the first main power circuit in the main power array is in operation, the temperature of the power devices in the first main power circuit is compared with the first preset temperature threshold Line1. If the temperature of all power devices in the first main power circuit is less than the first preset temperature threshold Line1, the power supply operating mode is adjusted to asynchronous rectification mode. If the temperature of any power device in the first main power circuit is greater than or equal to the first preset temperature threshold Line1, the power supply operating mode is adjusted to synchronous rectification mode. When only the second main power circuit in the main power array is in operation, the temperature of the power devices in the second main power circuit is compared with the second preset temperature threshold Line2 and the third preset temperature threshold Line3 respectively. If the temperature of any power device in the second main power circuit is greater than the second preset temperature threshold Line2 and less than the third preset temperature threshold Line3, and the temperature of any power device is greater than or equal to the third preset temperature threshold Line3, the power supply operating mode is adjusted to synchronous rectification mode. If the temperature of all power devices in the second main power circuit is less than or equal to the second preset temperature threshold Line2, the power supply operating mode is adjusted to asynchronous rectification mode. If the temperature of any power device in the second main power circuit is greater than or equal to the third preset temperature threshold Line3, the power supply operating mode is adjusted to multiphase parallel mode. When the second and third main power circuits in the main power array are in operation, the temperatures of the power devices in the second and third main power circuits are compared with the fourth preset temperature threshold Line4 and the fifth preset temperature threshold Line5, respectively. If the temperature of any power device in the second and third main power circuits is greater than the fourth preset temperature threshold Line4 and less than the fifth preset temperature threshold Line5, and the temperature of any power device is greater than or equal to the fifth preset temperature threshold Line5, the power supply operating mode is adjusted to multi-phase parallel mode. If the temperature of all power devices in the second and third main power circuits is less than or equal to the fourth preset temperature threshold Line4, the power supply operating mode is adjusted to synchronous rectification mode. If the temperature of any power device in the second and third main power circuits is greater than or equal to the fifth preset temperature threshold Line5, the power supply operating mode is adjusted to power protection mode.

4. The method for temperature-dependent power supply operating mode control according to claim 1, characterized in that, The step of adjusting the output mode control signal according to the power supply operating mode selected in the design and the corresponding logic operation includes: If the power supply is in asynchronous rectification mode, logic operation is used to output logic drive control EN1=H, EN2=L, EN3=L as the mode control signal corresponding to asynchronous rectification mode. If the power supply is in synchronous rectification mode, the logic drive control signals EN1=L, EN2=H, and EN3=L are output through logic operations as the mode control signals corresponding to the synchronous rectification mode. If the power supply is in a multi-phase parallel mode, logic operation is used to output logic drive control signals EN1=L, EN2=H, and EN3=H as the mode control signals corresponding to the multi-phase parallel mode. If the power supply is in the power protection mode, the logic drive control signals EN1=L, EN2=L, and EN3=L are output through logic operations as the mode control signals corresponding to the power protection mode.

5. A power supply with temperature-dependent power supply operating modes, characterized in that, include: The system includes a drive control array, a main power array, a sampling feedback array, a temperature comparison and determination array, and a digital logic processing circuit; among which, The drive control array is used to control the corresponding main power circuit in the main power array to work according to the received modal control signal; The main power array is designed to operate in a suitable power supply mode and output a corresponding power supply voltage under the control of the drive control array. The power supply modes include: asynchronous rectification mode, synchronous rectification mode, multiphase parallel mode, and power supply protection mode. The sampling feedback array is used to monitor, sample, and provide feedback on the temperature of the corresponding power devices in each power circuit of the main power circuit that is in operation in real time. The temperature comparison and determination array is used to comprehensively compare and determine the temperature of power devices in the main power circuit that is in operation based on a preset temperature threshold group, and output the comparison result. The digital logic processing circuit is used to comprehensively process the comparison results and output the corresponding power supply operating mode design mode control signal.

6. A power supply with temperature-dependent power supply operating modes as described in claim 5, characterized in that, In the power supply, the input terminal of the drive control array is connected to the output terminal of the digital logic processing circuit, and the drive control terminal is connected to the control terminal of the main power array; the input terminal of the main power array is connected to the external power supply voltage, and the output terminal serves as the output of the designed power supply; the sampling terminal of the sampling feedback array is connected to the power devices of each main power circuit in the main power array, and the output terminal is connected to the inverting input terminal of the temperature comparison and determination array; the positive input terminal of the temperature comparison and determination array is connected to the reference voltage corresponding to the preset temperature threshold, and the output terminal is connected to the input terminal of the digital logic processing circuit.

7. A power supply with temperature-dependent power supply operating modes as described in claim 5, characterized in that, The main power array includes: The circuit comprises a first main power circuit, a second main power circuit, and a third main power circuit; among which... The first main power circuit includes: Power MOSFET Q1, power diode D1, and power inductor L1; The gate of power MOSFET Q1 serves as the control terminal of the first main power circuit, the source is connected to the cathode of power diode D1, and the drain is connected to the external power supply voltage. The anode of power diode D1 is grounded, and the cathode is connected to one end of power inductor L1; The other end of the power inductor L1 serves as the output terminal of the first main power circuit. The second main power circuit includes: Power MOSFET Q2, power MOSFET Q3 and power inductor L2; The gate of power MOSFET Q2 serves as the first control terminal of the second main power circuit, and its source is connected to the drain of power MOSFET Q3, with the drain connected to an external power supply voltage. The gate of power MOSFET Q3 serves as the second control terminal of the second main power circuit, the drain is connected to one end of power inductor L2, and the source is grounded. The other end of the power inductor L2 serves as the output terminal of the second main power circuit. The third main power circuit includes: Power MOSFET Q4, power MOSFET Q5, and power inductor L3; The gate of power MOSFET Q4 serves as the first control terminal of the third main power circuit, and its source is connected to the drain of power MOSFET Q5, with the drain connected to an external power supply voltage. The gate of power MOSFET Q5 serves as the second control terminal of the third main power circuit, the drain is connected to one end of power inductor L3, and the source is grounded. The other end of the power inductor L3 serves as the output terminal of the third main power circuit.

8. A power supply with temperature-dependent power supply operating modes as described in claim 7, characterized in that, The temperature comparison and determination array performs a comprehensive comparison and determination of the temperature of the power devices in the main power circuit under operating conditions based on a preset temperature threshold group, and outputs the comparison results, including: When the first main power circuit in the main power array is in operation, the temperature comparison and determination array compares the temperature of power MOSFET Q1 and power diode D1 according to the first preset temperature threshold Line1 in the preset temperature threshold group. If the temperature of both Q1 and D1 is less than Line1, the comparison result corresponding to the asynchronous rectification mode is output; if the temperature of Q1 or D1 is greater than or equal to Line1, the comparison result corresponding to the synchronous rectification mode is output. When only the second main power circuit in the main power array is in operation, the temperature comparison and determination array compares the temperatures of power MOSFET Q2 and power MOSFET Q3 according to the second preset temperature threshold Line2 and the third preset temperature threshold Line3 in the preset temperature threshold group. If the temperature of Q2 or Q3 is greater than Line2 and less than Line3, and there is no temperature of Q2 or Q3 greater than or equal to Line3, the comparison result corresponding to the synchronous rectification mode is output; if the temperatures of Q2 and Q3 are both less than or equal to Line2, the comparison result corresponding to the asynchronous rectification mode is output; if the temperature of Q2 or Q3 is greater than or equal to Line3, the comparison result corresponding to the multiphase parallel mode is output. When the second and third main power circuits in the main power array are in operation, the temperature comparison and determination array compares the temperatures of power MOSFETs Q2, Q3, Q4, and Q5 according to the fourth preset temperature threshold Line4 and the fifth preset temperature threshold Line5. If any of the temperatures of Q2, Q3, Q4, and Q5 is greater than Line4 and less than Line5, and no temperature of Q2, Q3, Q4, or Q5 is greater than or equal to Line5, the comparison result corresponding to the multiphase parallel mode is output. If the temperatures of Q2, Q3, Q4, and Q5 are all less than or equal to Line4, the comparison result corresponding to the synchronous rectification mode is output. If any of the temperatures of Q2, Q3, Q4, and Q5 is greater than or equal to Line5, the comparison result corresponding to the power protection mode is output.

9. A power supply with temperature-dependent power supply operating modes as described in claim 7, characterized in that, The drive control array includes: First drive controller, second drive controller, and third drive controller; wherein... The input terminal of the first drive controller is connected to the first output terminal of the digital logic operation and processing circuit, and the drive control terminal is connected to the gate of the power MOSFET Q1 in the first main power circuit. The input terminal of the second drive controller is connected to the second output terminal of the digital logic operation processing circuit, the first drive control terminal is connected to the gate of the power MOSFET Q2 in the second main power circuit, and the second drive control terminal is connected to the gate of the power MOSFET Q3 in the second main power circuit. The input terminal of the third drive controller is connected to the third output terminal of the digital logic operation processing circuit, the first drive control terminal is connected to the gate of the power MOSFET Q4 in the third main power circuit, and the second drive control terminal is connected to the gate of the power MOSFET Q5 in the third main power circuit.

10. A power supply with temperature-dependent power supply operating modes as described in claim 7, characterized in that, The drive control array controls the corresponding main power circuit in the main power array to operate according to the received modal control signal, including: The drive control array controls the first main power circuit in the main power array to operate in the asynchronous rectification mode according to the mode control signal corresponding to the asynchronous rectification mode. The drive control array controls the second main power circuit in the main power array to operate in the synchronous rectification mode according to the mode control signal corresponding to the synchronous rectification mode. The drive control array controls the second and third main power circuits in the main power array to operate in multi-phase parallel mode according to the mode control signal corresponding to the multi-phase parallel mode. The drive control array controls the first main power circuit, the second main power circuit, and the third main power circuit in the main power array to be designed to not operate in the power protection mode according to the mode control signal corresponding to the power protection mode.

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