Power supply system and control method thereof, electronic equipment and storage medium

Abstract

The invention provides a power supply system and a control method thereof, electronic equipment and a storage medium. The power supply system comprises a controller, a multi-way switching power supply and a current detection circuit, the current detection circuit is used for monitoring the temperature of each path of switching power supply and determining the adjusting current of each path of switching power supply based on the temperature; and the controller is used for determining the output current of each path of switching power supply according to the adjusting current. Therefore, temperature equalization among the multiple switching power supplies is realized, and the stability and power supply efficiency of the power supply system are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supply, and in particular to a power supply system and a control method thereof, an electronic device and a storage medium. Background Art

[0002] The multi-phase switching power supply system is a power supply system designed to meet the needs of high-load applications. In this power supply system, multi-phase switching power supplies are connected in parallel to provide power to the load. The core of the power supply system is the controller, which is responsible for obtaining the current information of each phase of the switching power supply through a variety of current detection technologies, and then adjusting the PWM (Pulse width modulation) duty cycle according to the current information to ensure that the current distribution between each phase of the power supply is balanced.

[0003] In the application of high-power, high-density integrated circuits such as CPU (Central Processing Unit) or GPU (Graphics Processing Unit), there is a temperature imbalance between the switching power supplies of each phase due to the difference in position. The temperature imbalance may cause the high-temperature switching power supply to fail and be damaged, and the low-temperature switching power supply cannot achieve maximum energy efficiency. Summary of the invention

[0004] The present disclosure provides a power supply system and a control method thereof, an electronic device and a storage medium, so as to at least solve the above technical problems existing in the prior art.

[0005] According to a first aspect of the present disclosure, a power supply system is provided, comprising: a controller, a plurality of switching power supplies and a current detection circuit; the current detection circuit is used to monitor the temperature of each switching power supply and determine the regulating current of each switching power supply based on the temperature; the controller is used to determine the output current of each switching power supply based on the regulating current so as to achieve temperature balance among the plurality of switching power supplies.

[0006] In one possible implementation, the current detection circuit includes a temperature monitoring network, an RC network and a current detection network; the temperature monitoring network is used to monitor the temperature of the switching power supply and convert the temperature change into a linear resistance change; the RC network is used to determine the adjustment voltage based on the linear resistance change; the current detection network is used to determine the adjustment current based on the adjustment voltage.

[0007] In one possible implementation manner, the controller is further used to: determine a pulse width modulation wave of each switching power supply based on the regulated current; and determine an output current of each switching power supply based on the pulse width modulation wave.

[0008] In one possible implementation, the temperature monitoring network includes: a thermistor, a first resistor and a second resistor; the thermistor is used to convert the temperature change of the switching power supply into a nonlinear resistance change; the first resistor and the second resistor are used to convert the nonlinear resistance change into a linear resistance change.

[0009] In one possible implementation manner, the current detection network includes a detection resistor and an operational amplifier; the detection resistor is used to determine the current value according to the adjustment voltage; the operational amplifier is used to amplify the current value to obtain the adjustment current.

[0010] In one possible implementation manner, the controller is further used to: determine an error voltage according to a feedback voltage and a reference voltage; and compare the error voltage with the regulation current to determine a pulse width modulation wave of each switching power supply.

[0011] According to a second aspect of the present disclosure, a control method for a power supply system is provided, wherein the power supply system includes a plurality of switching power supplies, and the method includes: monitoring the temperature of each switching power supply, and determining a regulating current of each switching power supply based on the temperature; and regulating the output current of each switching power supply according to the regulating current to achieve temperature balance among the plurality of switching power supplies.

[0012] In one possible implementation, monitoring the temperature of each switching power supply and determining the regulation current of each switching power supply based on the temperature includes: monitoring the temperature of the switching power supply and converting the temperature change into a linear resistance change; determining a regulation voltage based on the linear resistance change; and determining the regulation current based on the regulation voltage.

[0013] According to a third aspect of the present disclosure, an electronic device is provided, comprising the power supply system according to any one of the above embodiments.

[0014] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium storing computer instructions is provided, wherein the computer instructions are used to enable a power supply system to execute the method described in the present disclosure.

[0015] The present invention discloses a power supply system and a control method thereof, an electronic device and a storage medium, wherein the power supply system includes a controller, a multi-channel switching power supply and a current detection circuit. The real-time temperature of the switching power supply is monitored by the current detection circuit, and the monitored temperature change is converted into an electrical signal (regulated current) and transmitted to the controller. The controller adjusts the duty cycle of the PWM signal of each switching power supply based on the received regulated current to adjust the output current size, thereby achieving temperature balance between each switching power supply. The stability and power supply efficiency of the power supply system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0017] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0018] Figure 1 A schematic diagram showing the composition structure of a multi-phase switching power supply system in the prior art is shown;

[0019] Figure 2 A schematic diagram of adjusting output current of a multi-phase switching power supply system in the prior art is shown;

[0020] Figure 3 A schematic diagram of an application scenario of an embodiment of the present disclosure is shown;

[0021] Figure 4 A schematic diagram of the structure of a power supply system according to an embodiment of the present disclosure is shown;

[0022] Figure 5 A temperature comparison diagram of a multi-phase power switch is shown;

[0023] Figure 6 A circuit diagram of a current detection circuit in an embodiment of the present disclosure is shown;

[0024] Figure 7 A schematic diagram of adjusting output current of a power supply system in an embodiment of the present disclosure is shown;

[0025] Figure 8 A schematic diagram of a PWM duty cycle in the prior art is shown;

[0026] Fig. 9 A schematic diagram of a PWM duty cycle of an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0027] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0028] like Figure 1As shown in the figure, the multi-phase switching power supply system increases the output capacity by connecting multiple switching power supply lines in parallel (such as the first phase, the second phase, etc.), and is mostly used in high-load applications (such as CPU, GPU, etc.). It uses a feedback loop to monitor the output voltage V out , get the feedback voltage V FB , and based on the feedback voltage V FB With the internal reference voltage V REF The comparison result dynamically adjusts the duty cycle of PWM (PWM1, PWM2, etc.) to accurately control the switching time of the MOS tube. out With input voltage V in There is a direct relationship between the duty cycle and V out =V in Therefore, by adjusting the duty cycle of PWM, the output voltage can be effectively adjusted and the current output capacity can be indirectly controlled.

[0029] To ensure the efficient operation of the multi-phase switching power supply system, the controller IC (Integrated Circuit) will further monitor the current signal in each phase circuit. Figure 2 As shown, I sens1 ,I sens2 and I sens3 The monitored current signal is compared with the feedback voltage V FB With the internal reference voltage V REF The signal is compared, and then the PWM duty cycle of each phase is adjusted to obtain PWM1, PWM2 and PWM3 to balance the current distribution between the phases and ensure that the current between the switching power supplies of each phase is basically consistent.

[0030] However, in the design of multi-phase switching power supplies based on high-heat applications such as CPUs or GPUs, due to differences in PCB (Printed Circuit Board) layout, heat dissipation conditions and other factors, the temperature performance of each phase of the switching power supply module in actual operation may vary greatly. Even if the current is evenly distributed, poor heat dissipation conditions may cause the temperature of some phases to rise significantly, affecting the long-term stability and reliability of the system. Figure 3 As shown, the multi-phase switching power supply system supplies power to the CPU, and the power supply system includes a six-phase switching power supply line. Among them, the deployment positions of the first phase, the second phase and the third phase switching power supply are not close to the edge of the board, and there is no thermal overlap. Under the same output current conditions, the temperature of these three phase lines will be lower. The deployment positions of the fourth phase, the fifth phase and the sixth phase are close to the edge of the board, and there is thermal overlap. Under the same output current conditions, the temperature of these three phase lines will be higher.

[0031] If the temperature difference between the switching power supplies of each phase is large, the higher temperature is prone to damage, aging and other faults. The lower temperature may not be fully utilized for its conductivity and material properties, thus affecting the charging efficiency of the entire system. In the current solution, if engineers measure the temperature imbalance between the phases, they can only adjust the temperature of each phase of the switching power supply by manually adjusting the parameters of the IC. However, the manual adjustment method is very complicated to implement and it is difficult to achieve complete balance.

[0032] In order to solve the above problems, the first aspect of the embodiments of the present disclosure provides a power supply system, such as Figure 4 As shown, the power supply system includes a controller, a multi-way switching power supply and a current detection circuit. The current detection circuit is used to monitor the temperature of each switching power supply and determine the regulated current of each switching power supply based on the temperature; the controller is used to determine the output current of each switching power supply according to the regulated current, so as to achieve temperature balance among the multi-way switching power supplies.

[0033] The power supply system includes multiple switching power supplies connected in parallel, and the load is powered by the switching power supplies. Each switching power supply includes at least a power switch (such as a MOS tube), an inductor, a capacitor and other components. The switching power supply part is the same as the prior art, so I will not introduce it in detail here (compared to the Figure 1 The current detection circuit is connected in parallel with the inductor of each power switch (such as Figure 1 L) as shown, used to monitor the temperature of each switching power supply and convert the temperature change into a current signal, that is, to adjust the current. This can be achieved by a temperature sensor (thermistor, integrated temperature sensor, etc.). Then the regulated current of each switching power supply is input to the controller.

[0034] The controller receives the regulated current and feedback voltage V from each switching power supply. FB The controller will reference voltage V REF and feedback voltage V FB The controller compares the current of each switching power supply and generates an error signal. The error signal is then further compared and calculated with the regulated current signal of each switching power supply. Based on the calculation results, the controller generates an appropriate duty cycle for each switching power supply to adjust its output current. The output current is proportional to the temperature, and the temperature is adjusted by adjusting the output current. The power supply system can achieve temperature balance among all switching power supplies while meeting the current demand of the load.

[0035] The power supply system disclosed in the present invention achieves temperature balance between each switching power supply through closed-loop control, which can effectively prevent reliability problems caused by overheating of a certain switching power supply. Moreover, under the condition of temperature balance, the load capacity of the power supply system can be improved. On the other hand, current CPUs usually have a turbo-boost function, which allows the CPU to automatically increase the frequency under certain conditions (such as low load and good heat dissipation) to cope with high-load tasks. The power supply system disclosed in the present invention can effectively manage current distribution and optimize heat dissipation, which can significantly increase the frequency of the CPU running at a higher frequency, thereby improving its processing speed and overall performance, and bringing users a smoother and more efficient user experience.

[0036] like Figure 5 As shown, the horizontal axes PH1-PH6 represent the first to sixth switch power supplies respectively, and the vertical axis is the temperature. Curve 1 is the temperature of each switch power supply in the prior art, and curve 2 is the temperature of each switch power supply in the power supply system. It can be seen from the figure that the temperature of the switch power supply of the first phase (PH1) in the prior art has reached the upper temperature limit, and the performance of the system will be limited. However, the temperature of each switch power supply in the power supply system disclosed in the present invention is relatively balanced, and the system performance can still be improved.

[0037] In one embodiment of the present disclosure, the current detection circuit includes a temperature monitoring network, an RC network and a current detection network; the temperature monitoring network is used to monitor the temperature of the switching power supply and convert the temperature change into a linear resistance change; the RC network is used to determine the adjustment voltage according to the linear resistance change; the current detection network is used to determine the adjustment current according to the adjustment voltage.

[0038] The temperature monitoring network includes temperature sensors that can convert the monitored temperature into electrical signals. In this way, the system can know the current temperature by reading this electrical signal. The RC network is a circuit composed of resistors and capacitors in parallel. The RC network is connected in series with the temperature monitoring network to form a voltage divider network. When the resistance value of the temperature detection network changes, the RC network is connected in series with the temperature monitoring network, and its voltage changes accordingly, thereby obtaining the regulated voltage. The current detection network is responsible for determining the regulated current based on the regulated voltage.

[0039] In one embodiment of the present disclosure, the temperature monitoring network includes: a thermistor, a first resistor and a second resistor; the thermistor is used to convert the temperature change of the switching power supply into a nonlinear resistance change; the first resistor and the second resistor are used to convert the nonlinear resistance change into a linear resistance change.

[0040] In this embodiment, the temperature monitoring network uses a thermistor. When the ambient temperature changes, the resistance of the thermistor will change nonlinearly according to its specific temperature coefficient. The thermistor is placed in the key part of the switching power supply to directly sense the operating temperature of the switching power supply. However, since the resistance of thermistor is nonlinear, that is, the relationship between temperature and resistance is not a simple proportional relationship, it is more complicated to directly use this change for control. Therefore, this embodiment introduces a first resistor and a second resistor in the temperature monitoring network. The second resistor is connected in series with the thermistor and then in parallel with the first resistor. Through the interaction between them, the nonlinear change between the resistance of the thermistor and temperature is converted into a linear change.

[0041] In one embodiment of the present disclosure, the current detection network includes a detection resistor and an operational amplifier; the detection resistor is used to determine the current value according to the regulated voltage; the operational amplifier is used to amplify the current value to obtain the regulated current.

[0042] The current detection network and the RC network have a common connection point, and the voltage across the detection resistor is the same as the voltage across the RC network, which is the regulated voltage. Therefore, if the regulated voltage and the resistance of the detection resistor are known, a current value can be obtained according to the inverse operation of Ohm's law. The current value is too small to be conducive to subsequent analysis, so the current value is input into the operational amplifier for amplification to obtain the amplified current, which is the regulated current.

[0043] In one embodiment of the present disclosure, the controller is further used to: determine a pulse width modulation wave of each switching power supply based on the regulated current; and determine an output current of each switching power supply based on the pulse width modulation wave.

[0044] The controller determines the PWM wave of each switching power supply according to the size of the received adjustment current, and then controls the on and off time of the switching element (such as MOS tube) in the switching power supply according to the PWM wave, thereby adjusting the output current of the switching power supply.

[0045] Specifically, the controller compares the feedback voltage with the reference voltage to determine the error voltage. In addition to considering the error voltage, the regulation current is introduced as an additional control factor to adjust the PWM duty cycle and thus determine the PWM wave of each switching power supply.

[0046] The power supply system of the present disclosure is described below by using a specific embodiment. Figure 6 Circuit shown:

[0047] Figure 6 The invention comprises a current detection circuit and an inductor of a multi-channel switching power supply. The current detection circuit of the n-th switching power supply is used as an example for explanation. The circuit is connected in parallel with the inductor L of the n-th switching power supply. nThe two ends of L n It is the inductor in a switching power supply, used to store and release energy. n is the inductance L n The current detection circuit includes a temperature monitoring network composed of a first resistor Rna, a second resistor Rnb and a thermistor NTCn, an RC network composed of a capacitor Cn and a resistor Rnc, and a current detection network composed of a resistor Rcsn and an operational amplifier.

[0048] The thermistor NTCn is placed in the inductor L n When the temperature of a certain switching power supply is high, the resistance value of thermistor NTCn R NTC The resistance of the temperature monitoring network Therefore, R 并 Will decrease. Among them, V csn For R csn The voltage across the terminals, V cn =IL n *DCR n , I is the current flowing through the inductor L n The current value. Since R decreases, V csn will increase. It can be seen that the regulating current I regn will increase. Figure 7 As shown, the oscillator generates an oscillating wave and adjusts the current I regn The voltage Vn is generated after the combination, and Vn is combined with the feedback voltage V FB With reference voltage V REF The error voltage V e Compare and generate PWMn corresponding to each switching power supply. At this time, the duty cycle of PWMn wave decreases, and the output current will decrease. When the output current decreases, the temperature will decrease accordingly.

[0049] Specifically, Figure 8 As shown, the duty cycle of PWM obtained in the prior art, V n ′ It is the voltage generated by the combination of the oscillation wave generated by the oscillator and the output current of the switching power supply. Fig. 9 The duty cycle of PWMn is obtained after adding the regulating current to the power supply system of this application, and Vn is the voltage generated by the oscillation wave generated by the oscillator and the regulating current. It can be seen that adding the regulating current can effectively reduce the duty cycle of PWM, thereby reducing the output current.

[0050] According to a second aspect of an embodiment of the present disclosure, a control method for a power supply system is provided, wherein the power supply system includes a plurality of switching power supplies, and the method includes: monitoring the temperature of each switching power supply, and determining a regulating current of each switching power supply based on the temperature; and regulating the output current of each switching power supply according to the regulating current to achieve temperature balance among the plurality of switching power supplies.

[0051] In one embodiment of the present disclosure, the temperature of each switching power supply is monitored and the regulating current of each switching power supply is determined based on the temperature, including: monitoring the temperature of the switching power supply and converting the temperature change into a linear resistance change; determining a regulating voltage based on the linear resistance change; and determining a regulating current based on the regulating voltage.

[0052] In one embodiment of the present disclosure, adjusting the output current of each switching power supply according to the regulating current includes: determining a pulse width modulation wave of each switching power supply based on the regulating current; and determining the output current of each switching power supply based on the pulse width modulation wave.

[0053] In one embodiment of the present disclosure, monitoring the temperature of the switching power supply and converting the temperature change into a resistance change includes: converting the temperature change of the switching power supply into a nonlinear resistance change; and converting the nonlinear resistance change into a linear resistance change.

[0054] In one embodiment of the present disclosure, determining the regulated current according to the regulated voltage includes: determining a current value according to the regulated voltage; and amplifying the current value to obtain the regulated current.

[0055] In one embodiment of the present disclosure, determining the pulse width modulation wave of each switching power supply based on the regulating current includes: determining an error voltage based on a feedback voltage and a reference voltage; and comparing the error voltage with the regulating current to determine the pulse width modulation wave of each switching power supply.

[0056] According to a third aspect of the embodiments of the present disclosure, an electronic device is provided, wherein the electronic device comprises a power supply system according to any one of the above embodiments. The electronic device may be an electronic device that needs to be powered, such as a laptop computer, a tablet computer, etc.

[0057] According to an embodiment of the present disclosure, the present disclosure also provides a readable storage medium.

[0058] When describing a storage medium as a "readable storage medium", it usually refers to a medium that can store data and can be read, such as a disk, flash memory, or optical disk. This medium stores specific instructions that can be read and executed. This means that these instructions are encoded and stored in the medium, and the device can read these instructions and perform corresponding operations based on them.

[0059] Regarding the instruction part, it is described that these instructions are used to make the power supply system perform certain operations. These instructions may include a series of commands, programs, algorithms, etc., which are designed to control, adjust or manage the functions of the power supply system. These functions may involve the adjustment of power output, the execution of protection mechanisms, the control of charging rates, etc., depending on the method described in claim 7 or 8. Therefore, these instructions are actually the operating steps or instructions required by the power supply system to enable it to perform operations in accordance with specific requirements or standards.

[0060] In summary, this description refers to a specific readable storage medium containing instructions designed to control the operation of the power supply system so that it can perform specific functions or operations according to the method described in claim 7 or 8.

[0061] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A power supply system, characterized in that: The power supply system comprises: a controller, a multi-way switch power supply and a current detection circuit; The current detection circuit is used to monitor the temperature of each switching power supply and determine the regulation current of each switching power supply based on the temperature; The controller is used to determine the output current of each switching power supply according to the regulated current, so as to achieve temperature balance among the multiple switching power supplies.

2. The power supply system according to claim 1, characterized in that: The current detection circuit includes a temperature monitoring network, an RC network and a current detection network; The temperature monitoring network is used to monitor the temperature of the switching power supply and convert the temperature change into a linear resistance change; The RC network is used to determine the adjustment voltage according to the linear resistance change; The current detection network is used to determine the regulated current according to the regulated voltage.

3. The power supply system according to claim 1, characterized in that: The controller is also used for: Based on the regulated current, determining a pulse width modulation wave of each switching power supply; Based on the pulse width modulation wave, the output current of each switching power supply is determined.

4. The power supply system according to claim 2, characterized in that: The temperature monitoring network includes: a thermistor, a first resistor and a second resistor; The thermistor is used to convert the temperature change of the switching power supply into a nonlinear resistance change; The first resistor and the second resistor are used to convert the nonlinear resistance change into a linear resistance change.

5. The power supply system according to claim 2, characterized in that: The current detection network includes a detection resistor and an operational amplifier; The detection resistor is used to determine the current value according to the adjustment voltage; The operational amplifier is used to amplify the current value to obtain a regulated current.

6. The power supply system according to claim 3, characterized in that: The controller is also used for: Determine the error voltage according to the feedback voltage and the reference voltage; The error voltage is compared with the regulation current to determine the pulse width modulation wave of each switching power supply.

7. A control method for a power supply system, characterized in that: The power supply system includes a multi-way switching power supply, and the method includes: Monitoring the temperature of each switching power supply, and determining a regulation current of each switching power supply based on the temperature; The output current of each switching power supply is determined according to the regulated current, so as to achieve temperature balance among the multiple switching power supplies.

8. The method according to claim 7, characterized in that The step of monitoring the temperature of each switching power supply and determining the regulating current of each switching power supply based on the temperature includes: Monitor the temperature of the switching power supply and convert the temperature change into linear resistance change; Determining an adjustment voltage according to the linear resistance change; According to the regulated voltage, a regulated current is determined.

9. An electronic device, characterized in that: The electronic device comprises the power supply system according to any one of claims 1 to 6.

10. A readable storage medium storing instructions, characterized in that: The instruction is used to enable the power supply system to execute the method according to claim 7 or 8.

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