CN114915141A

CN114915141A - Power supply system and power supply method

Info

Publication number: CN114915141A
Application number: CN202210545927.8A
Authority: CN
Inventors: 石宝平; 郭御风; 曾维; 商雨航
Original assignee: Phytium Technology Co Ltd
Current assignee: Phytium Technology Co Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-08-16

Abstract

The application provides a power supply system and a power supply method, which are beneficial to ensuring the stability of the power supply voltage of a processor. The power supply system includes: the power circuit and the processor are sequentially connected, the control circuit comprises a first port and a second port, and the processor comprises a voltage detection end; the control circuit is connected with the power circuit through a first port; the second port is connected with the voltage detection end; the control circuit is used for outputting a modulation signal, and the modulation signal is used for adjusting the switching frequency of the power circuit; the power circuit is used for receiving the modulation signal and outputting a power supply voltage for supplying power to the processor based on the modulation signal; the processor is used for feeding back the detection voltage to the control circuit under the action of the power supply voltage; the control circuit is further configured to perform the following operations based on the detected voltage: in response to the detected voltage being lower than the first preset voltage, the switching frequency of the power circuit is increased to the first switching frequency to reduce a droop amount of the supply voltage of the processor.

Description

Power supply system and power supply method

Technical Field

The present application relates to the field of power supply technologies, and in particular, to a power supply system and a power supply method.

Background

At present, most of the power supply modes of processors are based on a switching power supply mode. The stability of the processor supply voltage is related to the switching frequency of the switching power supply. The higher the switching frequency, the better the transient performance of the switching power supply, and the more stable the supply voltage of the processor will be. However, higher switching frequencies lead to higher heat generation. To reduce the thermal design difficulty, it is currently practiced to power the processor with a fixed and higher switching frequency.

However, the fixed switching frequency still sacrifices the transient performance of the switching power supply to a certain extent, and the stability of the power supply voltage of the processor cannot be ensured.

Disclosure of Invention

The application provides a power supply system and a power supply method, which can ensure the stability of the power supply voltage of a processor.

In a first aspect, a power supply system is provided, including: the power circuit and the processor are sequentially connected, the control circuit comprises a first port and a second port, and the processor comprises a voltage detection end; the control circuit and the power circuit are connected through the first port; the second port is connected with the voltage detection end; the control circuit is used for outputting a modulation signal, and the modulation signal is used for adjusting the switching frequency of the power circuit; the power circuit is used for receiving the modulation signal and outputting a power supply voltage for supplying power to the processor based on the modulation signal; the processor is used for feeding back detection voltage to the control circuit under the action of the power supply voltage; the control circuit is further configured to perform the following operations based on the detection voltage: in response to the detected voltage being lower than a first preset voltage, the switching frequency of the power circuit is increased to a first switching frequency to reduce a droop amount of the supply voltage of the processor.

The switching frequency of the switching power supply (namely, a power circuit in the switching power supply) is dynamically adjusted according to the size of the detection voltage on the processor. Since the higher the switching frequency, the better the transient performance of the switching power supply, the more stable the supply voltage provided to the processor will be. Therefore, under the condition that the detected voltage is lower than the first preset voltage, the switching frequency of the power circuit is increased, the drop amount of the processor power supply voltage can be reduced, and the stability of the processor power supply voltage is guaranteed.

In addition, the detection voltage of the embodiment of the application is the voltage of the voltage detection end positioned on the processor, and the voltage detection end is led out from the processor, so that the detected detection voltage is closer to the working voltage of the processor. The switching frequency is adjusted based on the working voltage of the processor, so that the voltage drop of the processor can be responded more timely, and the stability of the power supply voltage of the processor is improved.

As a possible implementation, the control circuit includes: the first voltage reference circuit is used for outputting the first preset voltage; and the first comparator is connected with the first voltage reference circuit and the voltage detection end and is used for judging whether the detection voltage is lower than the first preset voltage or not.

The embodiment of the application realizes the judgment of the detection voltage and the first preset voltage through the comparator, has a simple structure and is easy to realize and beneficial to saving the cost for a power supply system.

As a possible implementation, the control circuit is further configured to perform the following operations based on the detection voltage: in response to the detection voltage being higher than a second preset voltage, reducing the switching frequency of the power circuit from the first switching frequency to a second switching frequency, wherein the second preset voltage is higher than the first preset voltage.

In the embodiment of the application, when the detection voltage is higher than the second preset voltage, the control circuit reduces the switching frequency from the first switching frequency to the second switching frequency, so that the time for the switching power supply to operate at the first switching frequency is ensured to be short, the time is usually in the order of μ s, and a large amount of heat is not generated to the power supply system. Therefore, the scheme of the embodiment of the application can meet the transient performance requirement of the power circuit and cannot greatly influence the heating of the power supply system.

As a possible implementation, the control circuit includes: the second voltage reference circuit is used for outputting the second preset voltage; and the second comparator is connected with the second voltage reference circuit and the voltage detection end and is used for judging whether the detection voltage is higher than the second preset voltage or not.

The embodiment of the application realizes the judgment of the detection voltage and the second preset voltage through the comparator, has a simple structure and is easy to realize and beneficial to saving the cost for a power supply system.

As a possible implementation manner, the voltage detection end is an area where the lowest voltage point is located when the processor can normally operate.

The region where the voltage minimum is located when the processor is able to operate properly may be understood as the region on the processor where transient performance is worst. The area with the worst transient performance is used as a voltage detection end, so that the area with the worst transient performance on the processor can meet the requirement of the transient performance. In addition, because the areas with the worst transient performance can meet the transient performance requirement, other areas on the processor can meet the transient performance requirement.

As a possible implementation, the first switching frequency is a multiple of the switching frequency of the power circuit before the boost.

When the switching frequency of the power circuit is adjusted, the switching frequency can be increased to be the original multiple, so that the increased first switching frequency is larger, the larger first switching frequency is favorable for reducing the drop of the processor power supply voltage, and the stability of the processor power supply voltage is ensured.

In a second aspect, a power supply method is provided, where the power supply method is applied to a power supply system, the power supply system includes a control circuit, a power circuit and a processor, the power circuit and the processor are connected in sequence, the control circuit includes a first port and a second port, and the processor includes a voltage detection terminal; the control circuit and the power circuit are connected through the first port; the second port is connected with the voltage detection end; the control circuit is used for outputting a modulation signal, and the modulation signal is used for adjusting the switching frequency of the power circuit; the power circuit is used for receiving the modulation signal and outputting a power supply voltage for supplying power to the processor based on the modulation signal; the processor is used for feeding back detection voltage to the control circuit under the action of the power supply voltage; the power supply method comprises the following steps: acquiring the detection voltage through the voltage detection end; in response to the detected voltage being lower than a first preset voltage, the switching frequency of the power circuit is increased to a first switching frequency to reduce a droop amount of the supply voltage of the processor.

As a possible implementation manner, the power supply method further includes: in response to the detection voltage being higher than a second preset voltage, reducing the switching frequency of the power circuit from the first switching frequency to a second switching frequency, wherein the second preset voltage is higher than the first preset voltage.

In the embodiment of the application, when the detection voltage is higher than the second preset voltage, the switching frequency is reduced from the first switching frequency to the second switching frequency, so that the time for the switching power supply to operate at the first switching frequency is ensured to be relatively short, the time is usually in the order of μ s, and a relatively large amount of heat is not generated to a power supply system. Therefore, the scheme of the embodiment of the application can meet the requirement of the transient performance of the power circuit and cannot greatly influence the heating of the power supply system.

When the switching frequency of the power circuit is increased, the switching frequency can be increased to be the original multiple, so that the increased first switching frequency is larger, the larger first switching frequency is favorable for reducing the drop of the power supply voltage of the processor, and the stability of the power supply voltage of the processor is ensured.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic structural diagram of a power supply system applicable to the embodiment of the present application.

Fig. 2 is a schematic structural diagram of a power supply system according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of another power supply system according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a switching frequency adjustment method according to an embodiment of the present disclosure.

Fig. 5 is a schematic flowchart of a power supply method according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings. The same or similar reference numbers are used in the drawings to refer to the same or similar modules. It is to be understood that the drawings are diagrammatic and not restrictive, and that the scope of the application is not limited thereto.

First, with reference to fig. 1, a power scheme for a processor will be described.

Fig. 1 shows a power supply system. The power supply system can be applied to computer equipment and used for supplying power to a processor in the computer equipment. The computer device may be, for example, a server, an Artificial Intelligence (AI) accelerator card, or the like.

The processor is the operation core and control core of the computer device, and various interfaces and lines can be used for connecting various parts of the whole computer device. The processor can be used to execute instructions, programs, sets of code or instructions, etc., and can also call external data, perform various functions of the computer device, process data, etc. The specific type of the processor is not limited in the embodiments of the present application, and may be any one of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), or a System On Chip (SOC) that integrates the CPU and the GPU.

With continued reference to fig. 1, the power supply system 100 may include a switching power supply 110 and a processor 120. The switching power supply 110 is used to provide a supply voltage for the processor 120.

The type of switching power supply may be various. For example, the switching power supply may be an analog power supply. Also for example, the switching power supply may be a digital power supply. The number of phases of the switching power supply is not particularly limited in the embodiments of the present application. For example, the switching power supply may be a single-phase switching power supply or a multi-phase switching power supply. The multi-phase switching power supply may be, for example, a three-phase switching power supply, a four-way switching power supply, a five-phase switching power supply, or the like. The more phases of the switching power supply, the more energy the switching power supply provides to the processor. Fig. 1 is a schematic diagram illustrating a processor powered by a multi-phase digital power supply, but the embodiment of the present application is not limited thereto.

The switching power supply 110 may include a control circuit 111 and a power circuit 112. The control circuit 111 may be used to output a modulation signal that may be used to adjust the switching frequency of the power circuit 112. Power circuit 112 may be configured to receive the modulated signal and output a supply voltage based on the modulated signal to power processor 120. The modulation signal may be, for example, a Pulse Width Modulation (PWM) signal. It should be noted that the switching frequency of the power circuit may also be referred to as the switching frequency of the switching power supply, and the terms "switching frequency of the power circuit" and "switching frequency of the switching power supply" may be used interchangeably depending on the particular context.

The control circuit may include an analog to digital converter (ADC) 111-a, a Proportional Integral Derivative (PID) controller 111-b, and a comparator 111-c. The input terminal of the ADC 111-a is connected to the output terminal of the power circuit 112, and is configured to obtain the supply voltage VDD of the processor 120 (or may also be referred to as the output voltage of the power circuit), and perform analog-to-digital conversion on the obtained supply voltage, so as to convert the obtained supply voltage into a digital signal. An input terminal of the PID controller 111-b is connected to an output terminal of the ADC 111-a for receiving the digital signal output by the ADC 111-a. The PID controller 111-b can be used to perform PID algorithm processing on the voltage difference between the preset voltages VDD _ set and VDD. An output terminal of the PID controller 111-b is connected to an input terminal of the comparator 111-c for outputting a voltage difference between VDD _ set and VDD to the comparator 111-c. The comparator 111-c may compare the voltage difference with the triangular wave and output a modulation signal according to the comparison result. The modulation signal may be obtained, for example, by outputting a high level by the comparator when the voltage value on the triangular wave is smaller than the voltage difference, and outputting a low level by the comparator when the voltage value on the triangular wave is larger than the voltage difference with the rise of the voltage value on the triangular wave, so as to obtain the modulation signal. It is understood that the frequency of the triangular wave is the switching frequency of the power circuit. As can be seen from the above, the magnitude of the voltage difference is related to the duty ratio of the modulation signal, and the duty ratio of the modulation signal can be adjusted according to the magnitude of the voltage difference, so as to adjust the voltage output by the power circuit.

It should be noted that, if the switching power supply is a digital power supply, the preset voltage VDD _ set may be a digital signal. The preset voltage VDD _ set may be understood as a desired operating voltage of the processor, i.e. a supply voltage which the power circuit is desired to be able to provide.

The power circuit 112 may include a switching device and a driving circuit for driving the switching device, and for the specific structure of the power circuit and the connection relationship between the components, reference is made to the prior art, which is not described herein. The drive circuit may control the switching device to be turned on and off based on the received modulation signal. The switching device may comprise at least one switching tube. The switching transistor may be, for example, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), which is referred to as a MOS transistor for short. An input of the power circuit 112 is coupled to an output of the control circuit for receiving the modulated signal. The power circuit 112 may control the switching frequency of the switching devices in the power circuit 112 based on the modulation signal. The power circuit 112 in the embodiment of the present application may be a driver MOSFET (DRMOS).

The power circuit 112 may control the opening and closing of the switching device based on the received modulation signal, so that the voltage output by the power circuit 112 is stabilized at the preset voltage VDD _ set.

As mentioned before, the switching power supply may be a multi-phase switching power supply. The number of phases of the switching power supply is related to the number of power circuits. The number of power circuits may be plural if the switching power supply is a multiphase switching power supply. As shown in fig. 1, the number of the power circuits may be n, and the n power circuits are connected in parallel to provide a supply voltage for the processor. The power circuit after being connected in parallel can provide larger supply current for the processor.

If the switching power supply 110 includes n power circuits, the control circuit 111 may output n modulation signals, where the n modulation signals correspond to the n power circuits one to one, and the n power circuits may be respectively configured to receive the respective modulation signals and control the switching frequencies of the respective switching devices according to the modulation signals. Taking fig. 1 as an example, the control circuit 111 may be configured to output modulation signals PWM 0-PWNn, the power circuit 112 may include a power circuit 0-a power circuit n, and the PWMs 0-PWNn correspond to the power circuits 0-the power circuit n one to one. PWM0 is used to control the switching frequency of power circuit 0, PWM1 is used to control the switching frequency of power circuit 1, and so on, PWMn is used to control the switching frequency of power circuit n. Modulation signals PWM0 to PWNn may be the same or different, and are not particularly limited in this embodiment of the present application.

In some embodiments, the switching power supply 110 may further include a filter circuit 113. The input terminal of the filter circuit 113 may be connected to the output terminal of the power circuit 112, and is configured to filter the voltage output by the power circuit 112 to output a more stable supply voltage. An output of the filter circuit 113 may be coupled to an input of the processor 120 for providing the filtered voltage to the processor 120. The filtered voltage may be used as a supply voltage for the processor.

The embodiment of the present application does not specifically limit the filtering manner of the filter circuit. For example, the filter circuit may filter by means of inductive filtering. For another example, the filtering circuit may perform filtering by using capacitive filtering. For another example, the filtering circuit may perform filtering by means of LC filtering. In this case, the filter circuit may also be referred to as an LC filter circuit. As shown in FIG. 1, the filter circuit 113 may include an inductor 113-a and a capacitor 113-b.

With the development of the technology, people put more stringent requirements on various indexes of the switching power supply. For example, switching power supplies are required to be able to provide lower supply voltages and higher supply currents. Taking a processor in a server as an example, the current demand of the processor is more than 200A, and the power supply voltage is less than 1V.

In addition, higher demands are made on the operational stability of the processor. For example, it is desirable to minimize the voltage fluctuation of the processor when the load changes, i.e., to require good transient performance of the switching power supply. Especially under the heavy current scene, the job stabilization nature of treater appears especially important.

An important factor affecting the transient performance of a switching power supply is the switching frequency. The higher the switching frequency, the better the transient performance of the switching power supply, and the more stable the supply voltage provided to the processor will be. However, the higher the switching frequency, the more heat generated by the switching power supply. Therefore, to reduce the thermal design difficulty, it is currently practiced to power the processor with a fixed and higher switching frequency. For example, a multiphase digital power supply currently uses a switching frequency of 500K to power the processor.

However, the fixed switching frequency still sacrifices the transient performance of the switching power supply to some extent. For example, under the condition that the load does not change much, the fixed switching frequency can meet the transient performance requirement, and the supply voltage of the processor can be prevented from generating a large drop amount. However, in an emergency situation, such as when the load suddenly increases, if the switching frequency is still used, the supply voltage of the processor will have a large droop, and the switching frequency will not meet the transient performance requirement. If the power supply voltage of the processor drops below the minimum operating voltage of the processor, there is a risk that the processor will be down.

Based on this, the embodiment of the present application provides a power supply system, which can increase the switching frequency of the switching power supply when detecting that the voltage on the processor is lower than the first preset voltage, and can reduce the drop amount of the processor power supply voltage by supplying power to the processor with a high switching frequency.

The power supply system provided by the embodiment of the present application is described below with reference to fig. 2.

Referring to fig. 2, the power supply system may include a control circuit 210, a power circuit 220, and a processor 230. The control circuit 210, the power circuit 220 and the processor 230 are connected in sequence.

The control circuit 210 may include a first port 211 and a second port 212, the first port 211 may be an output of the control circuit 210, and the second port 212 may be an input of the control circuit 210. The control circuit 210 may output a modulation signal through the first port 211, and the modulation signal is used to adjust the switching frequency of the power circuit 220.

The power circuit 220 may be connected to the first port 211 of the control circuit 210, and configured to receive the modulated signal output by the control circuit 210 and output a supply voltage for supplying the processor 230 based on the modulated signal. The power circuit 220 may be the power circuit described in the previous embodiments.

The processor 230 is configured to receive the supply voltage output by the power circuit 220. The processor 230 may be enabled under the supply voltage. The processor 230 may include a voltage detection terminal 231, that is, the voltage detection terminal 231 is disposed on the processor 230, and the voltage detection terminal 231 of the processor may be connected to the second port 212 of the control circuit 210 for feeding back the detection voltage to the control circuit 210.

Therefore, the voltage detection end is led out from the processor in the embodiment of the application, so that the detected detection voltage is closer to the working voltage of the processor. The switching frequency is adjusted based on the working voltage of the processor, so that the voltage drop of the processor can be responded more timely, and the stability of the working voltage of the processor is improved.

In some embodiments, the voltage detection terminal may be a region where the lowest voltage point is located when the processor is capable of operating normally. Or the voltage detection end is the area where the lowest point of the working voltage of the processor is located. The processor may include multiple regions, and the operating voltages of different regions may be different. The voltage detection terminal of the embodiment of the application can be arranged in the area with the lowest working voltage in the plurality of areas. The region of lowest operating voltage may be understood as the region of worst transient performance.

According to the embodiment of the application, the area with the worst transient performance is used as the voltage detection end, so that the area with the worst transient performance on the processor can meet the requirement of the transient performance. If the areas with the worst transient performance can meet the transient performance requirement, other areas on the processor can meet the transient performance requirement.

The specific position of the voltage detection end can be obtained by a simulation experiment mode. The emulator may place test points on multiple regions of the processor, provide emulation stimulus to the processor, such as increasing the load on the processor, and then test the voltage (or VDD) across the multiple regions to obtain a voltage profile of VDD across each region. Further, the region where the lowest voltage point is located can be selected as the voltage detection terminal.

The control circuit 210 may obtain the detection voltage from the voltage detection terminal 231, and perform the following operations based on the detection voltage: in response to the detected voltage being lower than the first preset voltage, the switching frequency of the power circuit 220 is increased to the first switching frequency to reduce the amount of droop in the supply voltage of the processor 230.

The first preset voltage can be flexibly adjusted according to actual conditions, and the embodiment of the application is not particularly limited in this respect. In some embodiments, the first preset voltage may be higher than the lowest operating voltage of the processor, which may avoid the risk that the power supply voltage of the processor is lower than the lowest operating voltage of the processor, causing the processor to be down.

The size of the first switching frequency can be flexibly adjusted according to actual conditions, and the embodiment of the application is not particularly limited to this, as long as the first switching frequency is higher than the normal operating switching frequency of the power circuit. Taking the multi-phase digital power supply described hereinbefore as an example, in the normal operation mode, the switching frequency of the power circuit is 500K, in which case the first switching frequency may be higher than 500K. In some embodiments, the first switching frequency may be a multiple of the switching frequency prior to the boost. For example, the first switching frequency may be 1.5 times, 2 times, 3 times, etc., the switching frequency before the boost.

As can be seen from the foregoing description, the higher the switching frequency, the more energy is provided to the processor by the switching power supply per unit time, and therefore, the amount of droop of the processor power supply voltage can be reduced by increasing the switching frequency.

The embodiment of the application can utilize the first comparator to determine whether the detection voltage is lower than the first preset voltage. As shown in fig. 3, the power supply system may include a first voltage reference circuit and a first comparator 212. The first voltage reference circuit is used for outputting a first preset voltage. An input terminal of the first comparator 212 may be connected to an output terminal of the first voltage reference circuit and the voltage detection terminal 231, and is used for determining whether the detection voltage is lower than a first preset voltage. The first preset voltage output by the first voltage reference circuit may be a digital signal, in which case, the first comparator 212 and the first voltage reference circuit may be connected via a digital to analog converter (DAC) 214 for converting the digital signal into an analog signal. In case that the detected voltage is lower than the first preset voltage, the first comparator 212 may output a first control signal so that the control circuit 210 increases the switching frequency of the power circuit 220 to the first switching frequency.

In order to reduce the heat generation amount of the switching power supply, the embodiment of the present application may reduce the switching frequency of the power circuit 220 in a case where it is detected that the detection voltage of the processor 230 rises to the second preset voltage. For example, the control circuit 210 may decrease the switching frequency of the power circuit 220 from the first switching frequency to the second switching frequency in response to the detected voltage being higher than the second preset voltage. The second preset voltage is higher than the first preset voltage.

The second switching frequency may be understood as the switching frequency at which the switching power supply normally operates. And under the condition that the detection voltage is not lower than the first preset voltage, the switching power supply can work at a second switching frequency. When the detected voltage is lower than the first preset voltage, the control circuit may increase the switching frequency from the second switching frequency to the first switching frequency. When the detection voltage is higher than the second preset voltage, the control circuit may decrease the switching frequency from the first switching frequency to the second switching frequency.

Since the control circuit reduces the switching frequency from the first switching frequency to the second switching frequency when the detection voltage is higher than the second preset voltage, the time for the switching power supply to operate at the first switching frequency is short, usually in the order of μ s, and the time does not generate a large amount of heat to the power supply system. Therefore, the scheme of the embodiment of the application can meet the requirement of the switching power supply on the transient performance and cannot greatly influence the heating of a power supply system.

The second preset voltage is not specifically limited in the embodiment of the application, as long as the second preset voltage is higher than the first preset voltage. For example, the second preset voltage may be equal to the supply voltage of the processor (e.g., VDD _ set in fig. 1). For another example, the second preset voltage may be higher than a supply voltage of the processor. For another example, the second preset voltage may be lower than a supply voltage of the processor.

The embodiment of the application can utilize the second comparator to determine whether the detection voltage is higher than the second preset voltage. As shown in fig. 3, the power supply system may include a second voltage reference circuit and a second comparator 213. The second voltage reference circuit is used for outputting a second preset voltage. An input terminal of the second comparator 213 may be connected to the output terminal of the second voltage reference circuit and the voltage detection terminal 231, and is used for determining whether the detection voltage is higher than the second preset voltage. The second preset voltage output by the second voltage reference circuit may be a digital signal, in which case the second comparator 213 and the second voltage reference circuit may be connected via a DAC 215 for converting the digital signal into an analog signal. In case that the detection voltage is higher than the second preset voltage, the second comparator 213 may output a second control signal so that the control circuit 210 reduces the switching frequency of the power circuit 220 to the second switching frequency.

In some embodiments, the first switching frequency may be a multiple of the switching frequency of the power circuit prior to the boost. Taking the switching frequency of the power circuit before boosting as the second switching frequency as an example, the first switching frequency may be a multiple of the second switching frequency. In other words, in the case where the detected voltage is lower than the first preset voltage, the control circuit may perform frequency doubling processing on the switching frequency of the power circuit.

With continued reference to fig. 3, the power supply system of fig. 3 may further include a control module 211, where the control module 211 may correspond to the control circuit 111 of fig. 1. The input terminal of the control module 211 may be connected to the output terminals of the

comparators

211 and 213, and is used for adjusting the frequency of the triangular wave according to the output signals of the

comparators

211 and 213. The higher the frequency of the triangular wave is, the higher the switching frequency of the switching power supply is; the lower the frequency of the triangular wave, the lower the switching frequency of the switching power supply. Therefore, the adjustment of the switching frequency of the switching power supply can be realized by adjusting the frequency of the triangular wave.

As can be seen from the power supply system shown in fig. 3, in the solution of the embodiment of the present application, a control loop is added on the basis of the power supply system shown in fig. 1, so that the switching frequency of the switching power supply can be adjusted, and the implementation is relatively simple. The control loop may include a voltage detection terminal, a comparator, and a voltage reference circuit, among others.

In some embodiments, the VDD detection point in fig. 3 may also be integrated with the voltage detection terminal 231 into one detection point, that is, the VDD detection point may also be led out from the voltage detection terminal 231, so that the number of detection points that are provided may be reduced, and the complexity of the power supply system may be reduced.

The switching frequency adjustment process according to the embodiment of the present application is described below with reference to fig. 4. And at the time of 0-t 0, the switching power supply supplies power to the processor by using a second switching frequency, and the working voltage of the processor is stabilized at a second preset voltage. At time t0, the load on the processor suddenly increases, and the detection voltage at the voltage detection terminal starts to drop. If the switching frequency of the switching power supply is not adjusted and the first switching frequency is continuously used to supply power to the processor, the variation curve of the detection voltage is shown by the dotted line in fig. 3, and the detection voltage drops to V1.

In the embodiment of the present application, when the detection voltage is lower than the first predetermined voltage, the control circuit increases the switching frequency. As shown in fig. 4, at time t1, the control circuit boosts the switching frequency of the power circuit from the second switching frequency to the first switching frequency. Since the first switching frequency is higher than the second switching frequency, the droop value of the supply voltage of the processor may decrease after the first switching frequency is used. After the switching frequency rises, the change curve of the detection voltage is shown as a solid line in fig. 4, and the detection voltage starts to rise after dropping to V2, wherein V2 > V1. Therefore, after the switching frequency is raised, the drop amount of the processor supply voltage can be reduced.

The control circuit continues to detect the detection voltage of the processor, and when the detection voltage is greater than a second preset voltage, the control circuit reduces the switching frequency. As shown in fig. 4, at time t2, since the detection voltage is higher than the second preset voltage, the control circuit may decrease the switching frequency of the power circuit from the first switching frequency to the second switching frequency to reduce the heat generation amount of the power supply system.

The device embodiments of the present application are described in detail above in connection with fig. 1-4. Method embodiments of the present application are described in detail below in conjunction with fig. 5. It is to be understood that the description of the method embodiments corresponds to the description of the apparatus embodiments, and therefore reference may be made to the preceding apparatus embodiments for parts which are not described in detail.

Fig. 5 is a schematic flow chart of a power supply method provided in an embodiment of the present application. The power supply method is applicable to the power supply system described above. The method shown in fig. 5 may be implemented by the control circuit described above.

The power supply system may include: the power circuit and the processor are sequentially connected, the control circuit comprises a first port and a second port, and the processor comprises a voltage detection end; the control circuit and the power circuit are connected through the first port; the second port is connected with the voltage detection end; the control circuit is used for outputting a modulation signal, and the modulation signal is used for adjusting the switching frequency of the power circuit; the power circuit is used for receiving the modulation signal and outputting a power supply voltage for supplying power to the processor based on the modulation signal; and the processor is used for starting to work under the action of the power supply voltage and feeding back detection voltage to the control circuit.

Referring to fig. 5, the detection voltage is acquired through the voltage detection terminal at step S510.

In response to the detected voltage being lower than the first preset voltage, the switching frequency of the switching power supply is increased to the first switching frequency to reduce the drop amount of the supply voltage of the processor at step S520.

In some embodiments, the power supply method further comprises: in response to the detection voltage being higher than a second preset voltage, reducing the switching frequency of the power circuit from the first switching frequency to a second switching frequency, wherein the second preset voltage is higher than the first preset voltage.

In some embodiments, the voltage detection terminal is a region where a voltage lowest point is located when the processor can work normally.

In some embodiments, the first switching frequency is a multiple of the switching frequency of the power circuit prior to the boost.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be read by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Versatile Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A power supply system, comprising: the power circuit and the processor are sequentially connected, the control circuit comprises a first port and a second port, and the processor comprises a voltage detection end; the control circuit and the power circuit are connected through the first port; the second port is connected with the voltage detection end;

the control circuit is used for outputting a modulation signal, and the modulation signal is used for adjusting the switching frequency of the power circuit;

the power circuit is used for receiving the modulation signal and outputting a power supply voltage for supplying power to the processor based on the modulation signal;

the processor is used for feeding back detection voltage to the control circuit under the action of the power supply voltage;

the control circuit is further configured to perform the following operations based on the detection voltage:

in response to the detected voltage being lower than a first preset voltage, the switching frequency of the power circuit is increased to a first switching frequency to reduce a droop amount of the supply voltage of the processor.

2. The power supply system of claim 1, wherein the control circuit comprises:

the first voltage reference circuit is used for outputting the first preset voltage;

and the first comparator is connected with the first voltage reference circuit and the voltage detection end and is used for judging whether the detection voltage is lower than the first preset voltage or not.

3. The power supply system according to claim 1 or 2, wherein the control circuit is further configured to perform, based on the detected voltage:

in response to the detection voltage being higher than a second preset voltage, reducing the switching frequency of the power circuit from the first switching frequency to a second switching frequency, wherein the second preset voltage is higher than the first preset voltage.

4. The power supply system of claim 3, wherein the control circuit comprises:

the second voltage reference circuit is used for outputting the second preset voltage;

and the second comparator is connected with the second voltage reference circuit and the voltage detection end and is used for judging whether the detection voltage is higher than the second preset voltage or not.

5. The power supply system of claim 1, wherein the voltage detection terminal is an area where a voltage lowest point is located when the processor can normally operate.

6. The power supply system of claim 1, wherein the first switching frequency is a multiple of the switching frequency of the power circuit prior to the boost.

7. The power supply method is applied to a power supply system, the power supply system comprises a control circuit, a power circuit and a processor, the power circuit and the processor are sequentially connected, the control circuit comprises a first port and a second port, and the processor comprises a voltage detection end; the control circuit and the power circuit are connected through the first port; the second port is connected with the voltage detection end;

the power supply method comprises the following steps:

acquiring the detection voltage through the voltage detection end;

8. The power supply method according to claim 7, characterized by further comprising:

9. The power supply method according to claim 7, wherein the voltage detection terminal is a region where a voltage lowest point is located when the processor can normally operate.

10. The power supply method according to claim 7, wherein the first switching frequency is a multiple of the switching frequency of the power circuit before the step-up.