WO2021249271A1 - Dvfs power supply system and dvfs power supply control method - Google Patents

Abstract

Disclosed is a DVFS power supply system, which can be applied to the field of integrated circuit control. The system comprises a chip, a PMU, and a load module, wherein the PMU comprises a controller and a switching power supply; the chip is used for sending a voltage adjustment instruction to the controller, and the voltage adjustment instruction corresponds to a first voltage; if the first voltage to which the voltage adjustment instruction corresponds is greater or less than a threshold voltage, the controller is used for changing the state of the switching power supply, so that the switching power supply is switched from a first mode to a second mode, and thus the range of an output current that can be outputted by the switching power supply to the load module is changed. According to the present application, there is no need to wait for voltage feedback from a comparator to the load module, and thus dynamic response time can be reduced.

Description

DVFS power supply system and DVFS power control method

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on June 12, 2020, the application number is 202010536916.4, and the invention title is "DVFS power supply system and DVFS power control method", the entire content of which is incorporated into this application by reference middle.

Technical field

This application relates to the field of integrated circuit control, and in particular to a dynamic voltage and frequency scaling (DVFS) power supply system and a DVFS power supply control method.

Background technique

For the same chip, the higher the operating frequency, the higher the voltage required. DVFS dynamically adjusts the operating frequency and voltage of the chip according to the different needs of the computing power of the applications running on the chip, so as to achieve the purpose of energy saving.

In a power supply system using DVFS, the frequency of the chip corresponds to the voltage. When the chip is running at a certain frequency, due to the power change of the chip, the current of the chip will change, causing the voltage on the chip to jump. Through the comparator in the power management unit (PMU), the voltage change of the chip can be measured to obtain the voltage change rate. When the voltage change rate reaches a certain value, the PMU will change the output mode to the chip so that the jumped voltage returns to the original voltage. For example, when the chip changes from light load to heavy load, the PMU needs to switch from discontinuous conduction mode (DCM) to continuous conduction mode (CCM). There is a delay from the moment the chip enters the heavy load to the moment when the PMU switches to the CCM, that is, the dynamic response time.

During the dynamic response time, if the voltage after the jump deviates too much from the original voltage, or the dynamic response time is too long, it will cause the power supply of the power system to be abnormal. Therefore, how to reduce the dynamic response time has become a more difficult problem in the industry.

Summary of the invention

This application provides a DVFS power supply system and a DVFS power supply control method, which can reduce the dynamic response time.

The first aspect of this application provides a DVFS power supply system.

DVFS power system includes: chip, PMU and load module. The load module may be a chip, or some functional modules in the chip, such as a central processing unit (CPU), a graphics processing unit (GPU), or other loads that do not belong to the chip. The PMU includes a controller and a switching power supply. The switching power supply can be a BUCK circuit, a BOOST circuit, or a BUCK-BOOST circuit. The chip determines whether the voltage needs to be adjusted according to the demand for computing power. If the voltage needs to be adjusted, the chip is used to send a voltage adjustment instruction to the controller, and the voltage adjustment instruction corresponds to the first voltage. The voltage regulation command corresponding to the first voltage means that the voltage regulation command includes the first voltage or includes an identifier corresponding to the first voltage. If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the controller is used to change the state of the switching power supply, so that the switching power supply is converted from the first mode to the second mode, so that the output of the switching power supply to the load module can be changed. The range of current. Specifically, the controller is used to control the on and off of certain electronic components in the switching power supply to change the state of the switching power supply.

When the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the controller changes the output mode to the load module. There is no need to wait for the voltage feedback from the comparator to the load module, so the dynamic response time can be reduced.

Based on the first aspect of the present application, in the first implementation manner of the first aspect of the present application, the first mode is DCM, and the second mode is CCM. The output current of the PMU to the load module under CCM is greater than the output current to the load module under DCM. The controller is specifically configured to change the state of the switching power supply if the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, so that the switching power supply is converted from DCM to CCM. Among them, after the load module enters a heavy load, the output voltage of the PMU to the load module will drop. If the output voltage after the drop cannot meet the requirements, the load module may reset and restart, which will reduce user experience. The voltage regulation command sent by the chip is before the load module enters the heavy load. Therefore, by converting the DCM into CCM by the first voltage corresponding to the voltage regulation command being greater than the threshold voltage, the reset and restart phenomenon of the load module can be reduced, and the user experience can be improved.

Based on the first aspect of the present application, or the first implementation manner of the first aspect, in the second implementation manner of the first aspect of the present application, the switching power supply can output voltage values of multiple gears to the load module, and multiple voltages The values include V ₁ , V ₂ , ..., Vn, and multiple voltage values are arranged in ascending order, and n is an integer greater than 1. In a certain voltage gear, according to the power change of the load module, the current of the load module will change, that is, one voltage value corresponds to one current range, and multiple voltage values correspond to multiple current ranges. The multiple current ranges include A ₁ , A ₂ ,..., An. Wherein, the threshold voltage is equal to the voltage Vx corresponding to the current range Ax, and x is an integer greater than or equal to 1 and less than or equal to n. The current range of Ax is from H mA to J mA. When the output voltage of the switching power supply to the load module is Vx, the power change of the load module causes the output current of the switching power supply to the load module to change from H mA to J mA The output voltage of the switching power supply to the load module changes to Vc. H can be greater than J or less than J, that is, when the power of the load module increases, the low current of the load module jumps to a high current, and when the power of the load module decreases, the high current of the load module jumps to a low current.

The first voltage change rate is greater than or equal to the first value, where the first voltage change rate

When the output voltage of the switching power supply to the load module is V _x-1 , the power change of the load module causes the output current to the load module to change from K mA to L mA, which causes the output voltage of the switching power supply to the load module to change to V _c-1 , the voltage V _x-1 corresponds to the current range A _x-1 , the current range of the current range A _x-1 is K milliamps to L milliamps, and the second voltage change rate is less than the first value. Wherein, the second voltage change rate

In order to improve the dynamic response time, the capacitance of the load module can be increased. When the light load enters the heavy load, the voltage drops instantly, and the output voltage of the switching power supply to the load module is insufficient. At this time, the energy of the capacitor on the load module

It releases a part to supply the load module to maintain the voltage of the load module stable. After researching the terminal model, it is found that more than 90% of the power consumption of the terminal's daily use is concentrated in light and medium loads. In the case of medium and light load, the sudden change of the load voltage will not be large, and a smaller capacitor can be used to maintain the voltage stability of the load module. In the case of heavy load, the sudden change of the load voltage is relatively large, and a larger capacitor is required to maintain the voltage stability of the load module. In this application, it is first judged under which voltages will transient large voltage changes occur, that is, the first voltage change rate P1 is greater than or equal to the first value. The minimum voltage among these voltages is used as the threshold, that is, the second voltage change rate is less than the first value, and the threshold voltage is equal to the voltage Vx. When the first voltage corresponding to the voltage regulation command is greater than or equal to the threshold voltage, the state of the switching power supply is changed, so that the switching power supply is converted from the first mode to the second mode. And when the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the controller does not change the mode of the switching power supply according to the degree of deviation between the jumped voltage and the original voltage. When the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, it is considered that the load module is under heavy load. Therefore, in the case of heavy load, there is no need to use a capacitor to maintain the voltage stability of the load module, and the purpose of simplifying the negative capacitor is achieved.

Based on the first aspect of the present application, or any one of the first implementation to the second implementation of the first aspect, in the third implementation of the first aspect of the present application, the system further includes a comparator . If the first voltage corresponding to the voltage regulation command is less than the threshold voltage, the controller is used to determine whether the third voltage change rate is greater than the second value, and the third voltage change rate

Wherein, V _a is the first voltage, V _b is the second voltage, the second voltage is obtained from the load according to the comparator module. If the third voltage change rate is greater than the second value, the controller is also used to change the state of the switching power supply, so that the switching power supply is converted from the second mode to the first mode. Among them, in the case that the first voltage corresponding to the voltage regulation command is less than the threshold voltage, the controller can switch the mode according to the voltage change rate, because in the case of medium and light load, the sudden change of the load voltage will not be large, and the smaller value can be used. The capacitor is used to maintain the voltage stability of the load module. When the first voltage corresponding to the voltage regulation command is less than the threshold voltage, it is considered that the load module is under medium and light load. In this way, some smaller capacitors can be reserved to meet the flexible mode conversion requirements of the load module under medium and light loads.

Based on the first aspect of the present application, or any one of the first implementation to the third implementation of the first aspect, in the fourth implementation of the first aspect of the present application, the system further includes a comparator . The controller is also used to change the state of the switching power supply so that the output voltage of the switching power supply to the load module reaches the first voltage. The comparator is used to determine whether the voltage of the load module reaches the first voltage. If yes, the comparator is also used to send the first information to the controller. The first information may include a voltage value or the result of a comparison between a voltage value and the first voltage. The controller is also used to receive the first information. After receiving the first information, the controller is specifically configured to change the state of the switching power supply if the first voltage corresponding to the voltage regulation instruction is greater than or less than the threshold voltage after the controller receives the first information The switching power supply is converted from the first mode to the second mode. Among them, when the controller changes the state of the switching power supply, it takes a period of time until the voltage of the load module rises or drops to the first voltage. During this time, the chip can wait for the controller to complete the voltage regulation without changing the operating frequency. Because the current under CCM is greater than the current under DCM, that is, the power consumption is greater. Therefore, by performing the mode conversion only after the voltage of the load module reaches the first voltage, in the case of DCM to CCM, power can be saved.

Based on the first aspect of the present application, or any one of the first to third implementations of the first aspect, in the fourth implementation of the first aspect of the present application, the chip is also used to determine Whether the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage. If it is, the chip is also used to send a mode switch instruction to the controller. The controller is specifically configured to change the state of the switching power supply according to the mode conversion instruction, so that the switching power supply is converted from the first mode to the second mode. Among them, the comparison between the first voltage and the threshold voltage is completed in the chip, without adding other electronic devices or circuits, saving costs.

The second aspect of the present application provides a DVFS power control method.

The PMU receives the voltage regulation command sent by the chip, and the voltage regulation command corresponds to the first voltage. The voltage regulation command corresponding to the first voltage means that the voltage regulation command includes the first voltage or includes an identifier corresponding to the first voltage.

If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU changes the state of the switching power supply, so that the switching power supply is converted from the first mode to the second mode, so that the change of the switching power supply can affect the output current of the load module. Scope. The load module may be a chip, or some functional modules in the chip, such as CPU, GPU, or other loads that do not belong to the chip. Specifically, the PMU controls the on and off of certain electronic components in the switching power supply to change the state of the switching power supply.

When the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU changes its output mode to the load module. There is no need to wait for the voltage feedback from the comparator to the load module, so the dynamic response time can be reduced.

Based on the second aspect of the present application, in the first implementation manner of the second aspect of the present application, the first mode is DCM, and the second mode is CCM. If the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the PMU changes the state of the switching power supply, so that the switching power supply is converted from DCM to CCM.

Based on the second aspect of the present application, or the first implementation manner of the second aspect, in the second implementation manner of the second aspect, the switching power supply can output multiple voltage values to the load module, and the multiple voltage values include V ₁ , V ₂ ,..., Vn, multiple voltage values are arranged in ascending order, and n is an integer greater than 1. According to the power change of the load module, multiple voltage values correspond to multiple current ranges. The multiple current ranges include A ₁ , A ₂ ,..., An. Wherein, the threshold voltage is equal to Vx corresponding to Ax, and x is an integer greater than or equal to 1 and less than or equal to n. The current range of Ax is from H milliampere to J milliampere. When the output voltage of the switching power supply to the load module is Vx, the power change of the load module causes the output current to the load module to change from H mA to J mA, which causes the output voltage of the switching power supply to the load module to change to Vc. H can be greater than J or less than J, that is, when the power of the load module increases, the low current of the load module jumps to a high current, and when the power of the load module decreases, the high current of the load module jumps to a low current. The first voltage change rate is greater than or equal to the first value. in,

When the output voltage of the switching power supply to the load module is V _x-1 , the power change of the load module causes the output current to the load module to change from K mA to L mA, resulting in the output of the switching power supply to the load module The voltage change is V _c-1 . V _x-1 and the corresponding _{A x-1, A x-} 1 mA current range of K to L mA, the second voltage change is less than the first value. in,

Based on the second aspect of the present application, or any one of the first implementation to the second implementation of the second aspect, in the third implementation of the second aspect of the present application, if the voltage regulation command corresponds to If the first voltage is less than the threshold voltage, the PMU is used to determine whether the third voltage change rate is greater than the second value. The third rate of voltage change

Wherein, V _a is the first voltage, V _b is the second voltage, the second voltage is obtained from the load according to the comparator module. If the third voltage change rate is greater than the second value, the PMU is also used to change the state of the switching power supply, so that the switching power supply is converted from the second mode to the first mode.

Based on the second aspect of the present application, or any one of the first implementation to the third implementation of the second aspect, in the fourth implementation of the second aspect of the present application, the PMU according to the voltage regulation command The state of the switching power supply is changed so that the output voltage of the switching power supply to the load module reaches the first voltage. The PMU receives the first information sent by the comparator, where the first information is obtained by the comparator determining that the voltage of the load module reaches the first voltage. After the PMU receives the first information, if the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the state of the switching power supply is changed, so that the switching power supply is converted from the first mode to the second mode.

Based on the second aspect of the present application, or any one of the first implementation to the fourth implementation of the second aspect, in the fifth implementation of the second aspect of the present application, the PMU receives the mode switch command , The mode conversion instruction is obtained by the chip according to the first voltage corresponding to the voltage regulation instruction being greater than or less than the threshold voltage. After receiving the mode conversion command, the PMU changes the state of the switching power supply according to the mode conversion command, so that the switching power supply is converted from the first mode to the second mode.

Regarding the description of the beneficial effects of the second aspect of the present application, reference may be made to the description of the beneficial effects of the aforementioned first aspect of the DVFS power supply system.

The third aspect of the present application provides a DVFS power control method.

The chip sends a voltage regulation command to the PMU, so that the PMU changes the state of the switching power supply according to the voltage regulation command, so that the output voltage of the switching power supply to the load module reaches the first voltage, and the voltage regulation command corresponds to the first voltage;

If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the chip generates a mode switching command.

The chip sends a mode switching instruction to the PMU, so that the PMU changes the state of the switching power supply according to the mode switching instruction, so that the switching power supply is converted from the first mode to the second mode, so that the range of the output current of the switching power supply to the load module can be changed .

Based on the third aspect of the present application, in the first implementation manner of the third aspect of the present application, the first mode is DCM, and the second mode is CCM. If the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the chip generates a mode switching command. The chip sends a mode switching instruction to the PMU, so that the PMU changes the state of the switching power supply according to the mode switching instruction, so that the switching power supply is converted from DCM to CCM, so as to change the range of the output current of the switching power supply to the load module.

A fourth aspect of the present application provides a terminal, which is characterized in that the terminal includes the foregoing first aspect or the DVFS power supply system described in any one of the implementation manners in the first aspect.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the DVFS power supply system of the terminal;

Figure 2 is a schematic diagram of the structure of the BUCK circuit;

Figure 3 is a schematic diagram of the waveform when the BUCK circuit works in CCM;

Figure 4 is a schematic diagram of the waveform when the BUCK circuit works in DCM;

FIG. 5 is a schematic diagram of a structure of a DVFS power supply system in an embodiment of the application;

Figure 6 is a schematic diagram of the curve change of DCM converted to CCM;

Figure 7 is a schematic diagram of the curve change of the pressure regulation under CCM;

Figure 8 is a schematic diagram of curve changes of simultaneous voltage regulation and regulation mode;

Figure 9 is a schematic diagram of the power consumption of the terminal under different currents;

FIG. 10 is a schematic flowchart of a DVFS power supply control method in an embodiment of the application;

FIG. 11 is a schematic diagram of a structure of a terminal in an embodiment of the application.

detailed description

The embodiments of the present application provide a DVFS power supply system and a DVFS power control method, which are applied to the field of integrated circuit control and can reduce the dynamic response time.

In order to facilitate the understanding of the technical solutions in the present application, the related background technology in the technical solutions will be described below.

DVFS. At present, because the terminal chip has strict requirements on the life and power consumption of the power supply battery, it is necessary to use DVFS technology to dynamically adjust the working frequency and working voltage of the chip according to the real-time load demand of the chip, so as to effectively reduce the chip's The purpose of power consumption. Please refer to Figure 1, which is a schematic diagram of the DVFS power supply system of the terminal. The DVFS power supply system includes a chip 101, a PMU 102, a load module 106, and a capacitor 107. Among them, the PMU 102 includes a controller 103, a switching power supply 104, and a comparator 105. The load module 106 may be the chip 101, or a part of the functional modules in the chip 101, such as CPU, GPU, or other loads that do not belong to the chip 101. When the load module 106 is the chip 101, the system flow of the DVFS is as follows: the chip 101 collects signals related to the chip 101. According to relevant signals, the chip 101 predicts the performance required by the chip 101 in the next time period. The chip 101 converts the predicted performance into the required frequency, thereby adjusting the clock setting of the chip 101, changing the operating frequency of the chip 101, and calculating the corresponding voltage according to the new operating frequency. The chip 101 informs the PMU 102 about the voltage required by the chip 101. The PMU 102 controls the state of the switching power supply 104 to adjust the output voltage to the chip 101.

PMU102 is a highly integrated power management solution for portable applications, which integrates several types of traditional discrete power management devices into a single package, which can achieve higher power conversion efficiency and lower power consumption, and more The number of components is small to accommodate the reduced board space. In this application, the PMU 102 is a relatively broad concept, that is, whether the PMU 102 includes a certain circuit or structure does not require a very clear definition. For example, in FIG. 1, it can also be considered that the comparator 105 or the controller 103 does not belong to the structure of the PMU 102.

The switching power supply 104 can be a BUCK circuit (also called a step-down circuit), a BOOST circuit (also called a boost circuit), or a BUCK-BOOST circuit (also called a buck-boost circuit). As shown in Figure 2, Figure 2 is a schematic diagram of the structure of the BUCK circuit. The BUCK circuit includes a switch 201, a switch 202, an inductor 203, a capacitor 204, and a load L205. The inductor 203 and the capacitor 204 form a low-pass filter. Among them, the load L205 can be understood as the aforementioned load module 106. The switch 201 and the switch 202 may be high-frequency switch tubes, and the switch 202 may also be a diode. The switch 201 and the switch 202 are turned on and turned off in the opposite state. By turning on or turning off the switch 201, the magnitude and direction of the current in the inductor 203 are changed. When the switching power supply is a BUCK circuit, the voltage U _L on the load L is less than the input voltage Vin of the switching power supply. When the switching power supply is a BOOST circuit, the voltage U _L on the load L is greater than the input voltage Vin of the switching power supply. The voltage input end of the switching power supply 104 is connected to the battery of the terminal.

Switching power supplies have different working modes, including CCM, DCM and boundary conduction mode (BCM). The following is a description of the different modes.

In CCM, the inductor 203 current never reaches zero during one switching cycle. In other words, the inductor 203 never "resets", which means that within a switching cycle, the magnetic flux of the inductor 203 never returns to 0, and when the switch 202 is closed, there is still current flowing in the coil of the inductor 203. One switching cycle includes the on-time period and off-time period of the switch 201. Please refer to Figure 3. Figure 3 is a schematic diagram of the waveform when the BUCK circuit works in CCM. The curve 301 is a timing diagram of the turn-on and turn-off of the switch 201. The curve 302 is a timing diagram of the turn-on and turn-off of the switch 202. It can be seen from FIG. 3 that the on and off states of the switch 201 and the switch 202 are opposite. When the switch 201 is on, the switch 202 is off, and when the switch 201 is off, the switch 202 is on. The curve 303 is the voltage U _{L on the load L.} The curve 304 is the current I _{L on the load L.} Because the current of the inductor 203 will never return to zero during one switching period, the current I _L will never return to zero, that is, A is not equal to zero. The curve 305 is the current I _S1 on the switch 201. When the switch 202 is closed, current still flows in the coil of the inductor 203. Therefore, when the switch 201 is turned on, the current I _{S1 is} not zero.

In DCM, during the switching period, the current of the inductor 203 will always return to 0, which means that the inductor 203 is properly "reset", that is, when the switch 202 is closed, the current of the inductor 203 is zero. Please refer to Figure 4. Figure 4 is a schematic diagram of the waveform when the BUCK circuit works in DCM. The curve 401 is a timing diagram of the turn-on and turn-off of the switch 201. The curve 402 is a timing diagram of the on and off of the switch 202. It can be seen from the figure that the on and off states of the switch 201 and the switch 202 are opposite. The curve 403 is the voltage U _{L on the load L.} The curve 404 is the current I _{L on the load L.} Because in one switching period, the current of the inductor 203 will always return to zero, therefore, the current I _L will also return to zero, that is, B is equal to zero. The curve 405 is the current I _S1 on the switch 201. When the switch 202 is closed, the current in the coil of the inductor 203 is zero. Therefore, when the switch 201 is on, the current I _S1 is also zero. From the curve 403, it can be seen that the current of the inductor 203 drops to zero, causing the switch 202 to turn off. If this happens, the left end of the inductor 203 is open. Theoretically, the voltage at the left end of the inductor 203 should return to 0, that is, the voltage of the voltage U _L should return to 0, because the inductor 203 no longer has current and no oscillation occurs. However, because there are many parasitic capacitances around, such as the parasitic capacitances of the switch 201 and the switch 202, an oscillating circuit is formed.

Boundary or boundary conduction mode (BCM): The controller monitors the current of the inductor 203, and once it detects that the current is equal to 0, the switch 201 is immediately closed. The controller always activates the switch 201 through the current "reset" signal of the inductor 203. If the inductor current is high and the cut-off slope is fairly flat, the switching period is extended. Therefore, the BCM variator is a variable frequency system. The BCM converter may also be referred to as a critical conduction mode (CRM).

CCM is suitable for heavy load scenarios, and DCM is suitable for light to medium load scenarios. Different working modes are suitable for different working scenes, so in circuits that include different scenes at the same time, different modes need to be switched according to different scenes. In the following, according to Fig. 1, the mode switching is explained by taking the DCM switching CCM as an example. When the load module 106 is the chip 101, the chip 101 works at a certain frequency, and the switching power supply 104 works at DCM. Due to the power change of the chip 101, for example, the CPU usage rate of the chip 101 changes from 2% to 90%, which will cause the current of the chip 101 to change, causing the voltage on the chip 101 to change from 1.0V to 0.97V. Through the comparator 105 in the PMU 102, the voltage change of the chip 101 can be measured, and the voltage change rate of 3% can be obtained. When the voltage change rate of 3% reaches a certain value, the PMU 102 changes the output mode of the switching power supply 104 to the chip 101 by changing the state of the switching power supply 104, and switches from DCN to CCM. From the moment when the CPU usage rate of the chip 101 changes from 2% to 90%, to the moment when the PMU 102 switches to the CCM, there is a delay, that is, the dynamic response time. The dynamic response time is an important indicator in the design of the power supply system. It represents the time required for the output voltage of the power supply to the load module to recover to the set range when the current of the load module changes suddenly.

When the power of the chip 101 greatly jumps, causing the current passing through the chip 101 to jump significantly, the output voltage of the switching power supply 104 to the chip 101 will momentarily deviate from the target set value. If the voltage deviation is too large, or the deviation time is too long (that is, the dynamic response time is too long), it will cause the power supply of the power system to be abnormal. How to ensure that the current of the chip 101 jumps significantly, but the fluctuation of the output voltage of the chip 101 by the switching power supply 104 is within an acceptable range, which has become a difficult problem in the industry.

By adding a capacitor 107 at the load end, the deviation of the voltage can be reduced. When the CPU usage rate of the chip 101 changes from 2% to 90%, the output capacity of the switching power supply 104 is insufficient, the voltage drops instantly, the controller 103 has not received the feedback voltage of the comparator 105, and the output mode is not adjusted. At this time, a part of the energy on the capacitor 107 is released to supply the load increment of the chip 101 to maintain the voltage stability. According to the capacitance energy formula

It can be seen that increasing or increasing the capacitor can increase the energy of the capacitor, and can provide more energy to maintain the voltage stability at the moment of a voltage drop. Increasing the capacitance does not reduce the dynamic response time, but only compensates for the voltage drop through the energy on the capacitance, and brings corresponding defects, that is, more or larger capacitances increase the PCB board area and increase the cost.

In order to reduce the dynamic response time, this application provides a DVFS power supply system. When the chip determines that the output voltage to the load module needs to be adjusted according to the power change of the load module, it can determine whether to adjust the output mode of the switching power supply, thereby reducing or even eliminating the dynamic response time. For example, the chip needs to adjust the output voltage of the chip from 0.8V to 1.0V according to the change of the operating frequency. In the case of determining 1.0V, you can determine whether to adjust the output mode of the switching power supply. Compared with the switching power supply adjusting the output voltage of the chip to 1.0V, and then determining whether to adjust the output mode of the switching power supply according to the voltage change rate, the DVFS power supply system in this application has an obvious effect on reducing the dynamic response time. The DVFS power supply system in this application will be described in detail below in conjunction with the accompanying drawings. For the convenience of explanation, in this application, the load module is used as a chip, the switching power supply is a BUCK circuit, and the switching power supply is switched from DCM to CCM as an example.

Please refer to FIG. 5, which is a schematic structural diagram of a DVFS power supply system in an embodiment of the application.

The DVFS power supply system includes a chip 501, a PMU, a capacitor 507, and a load module 508. Among them, the PMU includes a controller 502 and a switching power supply. The switching power supply includes a switch 503, a switch 504, an inductor 505, and a capacitor 506. Optionally, the PMU may further include a comparator 509.

The chip 501 is used to determine whether the operating frequency needs to be adjusted according to the computing capability. For example, the chip 501 is used to determine whether the operating frequency needs to be adjusted according to the current CPU usage rate. When the CPU usage rate is greater than the threshold, the current operating frequency 1 is increased, and the operating frequency 2 is obtained. Or the chip 501 is used to predict the amount of data to be run, and determine the corresponding operating frequency 2 according to the amount of data to be run. If the operating frequency 2 is different from the current operating frequency 1, it is determined to adjust the operating frequency of the chip 501.

The operating frequency 2 is the operating frequency to which the chip 501 will be adjusted, which can be different values, that is, the operating frequency of the chip 501 includes multiple gears, and the operating frequency of different gears can correspond to different output voltages of the switching power supply to the chip 501. As shown in Table 1, Table 1 is a mapping table of the operating frequency and voltage of the chip 501. If the operating frequency of the chip 501 needs to be adjusted from 2.0GHz to 2.2GHz, because the voltages corresponding to both 2.0GHz and 2.2GHz are 1.5V, the PMU does not need to adjust the output voltage of the switching power supply to the chip 501. If the operating frequency of the chip 501 needs to be adjusted from 2.2GHz to 2.4GHz, because the voltage corresponding to 2.2GHz is 1.5V and the voltage corresponding to 2.4GHz is 2.0V, the PMU needs to adjust the output voltage of the switching power supply to the chip 501.

Operating frequency	Voltage
2.0GHz	1.5V
2.2GHz	1.5V
2.4GHz	2.0V
2.6GHz	2.5V

Table I

If the output voltage of the switching power supply to the chip 501 needs to be adjusted, the chip 501 is used to send a voltage adjustment instruction to the controller 502, and the voltage adjustment instruction corresponds to the first voltage. The voltage regulation command corresponding to the first voltage means that the voltage regulation command includes the first voltage, such as 2.0V, or includes an identifier corresponding to the first voltage, and the content of the identifier may be agreed upon by the chip 501 and the controller 502 in advance.

If the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the chip 501 is also used to generate a mode conversion command and send the mode conversion command to the controller 502. In the embodiment of the present application, it is assumed that the threshold voltage is 2.2V. If the operating frequency of the chip 501 needs to be adjusted from 2.2 GHz to 2.4 GHz. Because the voltage corresponding to 2.2GHz is 1.5V and the voltage corresponding to 2.4GHz is 2.0V, the PMU needs to adjust the output voltage of the switching power supply to the chip 501, that is, the first voltage corresponding to the voltage regulation command is 2.0V, 2.0V is less than 2.2V, The condition for the chip 501 to generate the mode switching instruction is not satisfied. If the operating frequency of the chip 501 needs to be adjusted from 2.4GHz to 2.6GHz. Because the voltage corresponding to 2.4GHz is 2.0V and the voltage corresponding to 2.6GHz is 2.5V, the PMU needs to adjust the output voltage of the switching power supply to the chip 501, that is, the first voltage corresponding to the voltage regulation command is 2.5V, and 2.5V is greater than 2.2V. The conditions for the chip 501 to generate the mode switching instruction are met.

Optionally, according to Table 1, there is a mapping relationship between the operating frequency and voltage of the chip 501. According to the foregoing description, it can be known that the chip 501 can generate a mode switching command based on whether the first voltage corresponding to the voltage regulation command is greater than the threshold voltage. It can be deduced that the chip 501 can generate a mode switching instruction based on whether the operating frequency to be adjusted is greater than the threshold frequency. For example, set the threshold frequency to 2.5 Hz. If the operating frequency of the chip 501 needs to be adjusted from 2.2 GHz to 2.4 GHz, that is, the operating frequency that the chip 501 needs to adjust is 2.4 GHz, which is less than the threshold frequency of 2.5 Hz, which does not meet the conditions for the chip 501 to generate a mode switching instruction. If the operating frequency of the chip 501 needs to be adjusted from 2.4 GHz to 2.6 GHz, that is, the operating frequency of the chip 501 needs to be adjusted is 2.6 GHz, which is greater than the threshold frequency of 2.5 Hz, and meets the conditions for the chip 501 to generate a mode switching instruction.

The threshold voltage in the foregoing is 0.9V, which is a hypothetical value. In practical applications, the threshold voltage can be determined according to the following method.

The switching power supply can output voltage values of multiple gears to the chip 501. The multiple voltage values include V ₁ , V ₂ , ..., Vn, and the multiple voltage values are arranged in ascending order, and n is an integer greater than 1. Specifically, when the switching power supply is operating under CCM, as shown in FIG. 3, the switching power supply can adjust the duration of D, that is, the on-time duration of the switch 503, so as to change the proportion of D in T, thereby adjusting the switching power supply 104 The output voltage. When the switching power supply 104 runs in DCM, as shown in FIG. 4, the switching power supply 104 can adjust the duration of T, that is, one switching period of the switch 503, so that the proportion of D in T is changed, thereby adjusting the switching power supply 104 The output voltage. At a certain voltage level, according to the power change of the chip 101, for example, the CPU usage rate of the chip 101 changes from 2% to 90%, the current of the chip 101 will change, that is, a voltage value corresponds to a current range, and multiple voltages The value corresponds to multiple current ranges. The multiple current ranges include A ₁ , A ₂ ,..., An. As shown in Table 2, Table 2 is a mapping table of voltage range and current range.

Voltage gear	Current range
V 1 : 1.0V	A 1 ：0.2A～0.5A
V 2 : 1.5V	A 2 ：0.2A～0.8A
V 3 : 2.0V	A 3 ：0.2A～1.2A
V 4 : 2.5V	A 4 : 0.2A～1.5A

Table II

In each voltage range, by changing the power of the chip 501, the current of the chip 501 will be changed, which will cause the voltage of the chip 501 to jump. Among them, if the current in the chip 501 is changed from the minimum current to the maximum current, the maximum voltage jump rate can be obtained. For example, when the output voltage of the switching power supply is 1.0V, the CPU usage rate of chip 501 changes from 1% to 100%, the current of chip 501 changes from 0.2A to 0.5A, and the voltage of chip 501 jumps from 1.0V to 0.99 V. In the voltage range of 1.0V, through 1.0V and 0.99V, the corresponding maximum voltage jump rate can be obtained. In each voltage range, the respective maximum voltage jump rate is obtained, and the mapping relationship between the voltage range and the maximum voltage jump rate as shown in Table 3 is obtained.

Voltage gear	Current range	Voltage after jump	Voltage jump rate
V 1 : 1.0V	A 1 ：0.2A～0.5A	0.99V	1.0%
V 2 : 1.5V	A 2 ：0.2A～0.8A	1.48V	1.3%
V 3 : 2.0V	A 3 ：0.2A～1.2A	1.95V	2.5%
V 4 : 2.5V	A 4 : 0.2A～1.5A	2.42V	3.2%

Table Three

Assume that the first value is 2.0%. The first value is a voltage jump rate threshold. In practical applications, the voltage jump rate threshold is generally 2% to 3%. If the voltage jump rate in the chip 501 is greater than the voltage jump rate threshold, that is, the difference between the jumped voltage and the original voltage is too large, which will cause the system to be abnormal. According to Table 3, the voltage jump rates corresponding to the voltage levels _{V 1} and V ₂ are less than the first value, and the voltage jump rates corresponding to the voltage levels _{V 3} and V _{4 are greater than the first value.} Therefore, it can be concluded that the voltage range V ₃ corresponds to the first voltage jump rate P1 being greater than the first value, and the voltage range V ₂ corresponds to the second voltage jump rate P2 to be smaller than the first value, so that the threshold voltage is determined to be V ₃ 2.0V .

Optionally, generally, the maximum voltage jump rate in each voltage range increases as the voltage range increases. Therefore, if the controller 502 obtains the maximum voltage jump rate in different gears, there is no need to obtain the maximum voltage jump rate in all gears. For example, in Table 3, the switching power supply can output 4 levels of voltage. After the controller 502 obtains _{the voltage jump rates corresponding to the voltage levels V 2} and V ₃ , it can determine that the threshold voltage is V ₃ 2.0V, that is, the controller 502 does not need to obtain the voltage jump rates corresponding _{to V 1} and V _4, Thereby saving processing resources.

Optionally, before obtaining the threshold voltage, the controller 502 tries to obtain the maximum voltage jump rate 1 corresponding to the voltage level 1. The voltage gear 1 is the middle voltage gear among all the voltage gears, such as the voltage gear V ₃ in Table 3. If the maximum voltage jump rate 1 corresponding to the voltage gear 1 is greater than the first value, the controller 502 obtains the maximum voltage jump rate 2 corresponding to the voltage gear 2. The voltage gear 2 is a voltage gear that is one gear lower than the voltage gear 1. If the maximum voltage jump rate 1 corresponding to the voltage gear 1 is less than the first value, the voltage gear 2 is a voltage gear that is one gear larger than the voltage gear 1. Through this algorithm, the efficiency of obtaining the threshold voltage can be improved while saving processing resources.

After the controller 502 receives the mode conversion instruction, the controller 502 is used to change the state of the switching power supply, so as to change the output mode of the switching power supply, so as to change the range of the output current that the switching power supply can output to the load module, referred to as the adjustment mode. Specifically, as shown in FIG. 6, FIG. 6 is a schematic diagram of the curve change of the conversion from DCM to CCM. The curve 601 is the voltage U _L on the load module under DCM, and the curve 602 is the current I _L on the load module under DCM. Curve 603 is the voltage U _L on the load module under CCM, and curve 604 is the current I _L on the load module under CCM. In DCM, in a switching cycle, the current of the inductor in the switching power supply drops to zero, and due to the existence of parasitic capacitance, an oscillation loop is formed. The cut-off duration of the switch 503 is changed so that the current of the inductor in the switching power supply does not drop to 0 within one switching period, and an oscillating loop is not formed. It should be determined that whether there is an oscillating waveform is a way to distinguish modes. In practical applications, the modes can also be distinguished by other methods, such as measuring whether the current in the inductor in the switching power supply returns during a switching cycle. To 0. Under DCM and CCM, because the lowest current on the load module is different, that is, the value of A in the curve 602 is different from the value of B in the curve 604, resulting in a different range of the output current of the switching power supply to the load module. In one mode, the controller 502 can change the output voltage of the switching power supply to the load module and change the output current of the switching power supply to the load module. Therefore, the switching power supply can have a range for the output current of the load module. The following is a description of how the controller 502 changes the output voltage of the switching power supply to the load module.

After the controller 502 receives the voltage regulation instruction, the controller 502 is used to change the state of the switching power supply, so as to change the output voltage of the switching power supply to the chip 501, which is referred to as voltage regulation for short. Specifically, as shown in FIG. 7, FIG. 7 is a schematic diagram of the curve change of the voltage regulation under the CCM. The curve 701 is the voltage U _L on the load module before the voltage regulation, and the curve 702 is the current I _L on the load module before the voltage regulation. The curve 703 is the voltage U _L on the load module after voltage regulation, and the curve 704 is the current I _L on the load module after voltage regulation. Before the voltage regulation, the duration of one switching cycle of the switch 503 is T. In one switching cycle, the on-time duration of the switch 503 is D1, and the off-time duration is T-D1. Changing the on-duration of the switch 503, the on-duration becomes D2, and the off-duration of the switch 503 becomes T-D2. When D1 and D2 are different, the output voltage of the switching power supply is different. Because the output voltage of the switching power supply to the load module is different, the current of the load module is also different when the blocking of the load module is unchanged, that is, the value of C in the curve 702 and the value of D in the curve 704 are different.

Voltage regulation and regulation mode can be executed at the same time or separately. When executed separately, you can execute the adjustment mode first, and then execute the adjustment mode, or you can execute the adjustment mode first, and then the adjustment mode. Because both the voltage regulation and the regulation mode change the state of the switching power supply, that is, the states of the switch 503 and the switch 504, the voltage regulation and the regulation mode can be performed at the same time. When the voltage regulation and the regulation mode are executed at the same time, as shown in Fig. 8, Fig. 8 is a schematic diagram of the curve change of the simultaneous voltage regulation and the regulation mode. D2 in FIG. 8 is different from D1 in FIG. 6. The graph of FIG. 8 can be understood as the result of adding the graph of FIG. 6 and the graph of FIG. 7.

Optionally, the comparator 509 is used to determine whether the voltage of the chip 501 reaches the first voltage. If so, the comparator 509 is also used to send the first information to the controller 502. The first information may include a voltage value or the result of a comparison between a voltage value and the first voltage. The controller 502 is also used to receive first information. After receiving the first information, the controller 502 is specifically configured to, after receiving the first information, if the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the controller 502 is configured to change the state of the switching power supply so that the switch The power is converted from DCM to CCM. Among them, when the controller 502 changes the state of the switching power supply, it takes a period of time for the voltage of the chip 501 to rise to the first voltage. During this period of time, the chip 501 can wait for the controller 502 to complete the voltage regulation without changing the operating frequency. Because the current under CCM is greater than the current under DCM, that is, the power consumption is greater. Therefore, by performing the mode conversion only after the voltage of the chip 501 reaches the first voltage, power can be saved.

Optionally, if the chip 501 is not used to compare the magnitude of the threshold voltage and the first voltage, and does not generate a mode switching instruction, the controller 502 is also used to determine whether the first voltage corresponding to the voltage adjustment instruction is greater than the threshold voltage according to the voltage adjustment instruction . If the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the controller 502 is used to change the state of the switching power supply, so that the switching power supply is converted from DCM to CCM. Among them, the threshold voltage generally needs to be obtained by the controller 502. The controller 502 is used to compare the threshold voltage and the first voltage. The controller 502 does not need to send the threshold voltage to the chip 501 in advance, reducing the difference between the controller 502 and the chip 501 Information exchange between.

After researching the terminal model, it is found that more than 90% of the power consumption of the terminal's daily use is concentrated in light and medium loads. As shown in Figure 9, Figure 9 is a schematic diagram of the power consumption of the terminal under different currents. It can be seen from Figure 9 that more than 90% of the power consumption of the terminal is concentrated in the medium and light load (current less than 2.0A). In the case of medium and light load, the sudden change of the load voltage will not be large, and a smaller capacitor can be used to maintain the voltage stability of the load module. In the case of heavy load, the sudden change of the load voltage is relatively large, and a larger capacitor is required to maintain the voltage stability of the load module.

Optionally, if the first voltage corresponding to the voltage adjustment command is greater than the threshold voltage, and the voltage of the chip 501 before the voltage adjustment is less than the threshold voltage, the state of the switching power supply is changed so that the switching power supply is converted from DCM to CCM. The controller 502 does not change the mode of the switching power supply according to the voltage change rate of the chip 501. When the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, it is considered that the chip 501 is under heavy load. Therefore, under heavy load conditions, there is no need to use a capacitor to maintain the voltage of the chip 501 stable, and the purpose of simplifying the capacitor is achieved. With reference to FIG. 5, it can be understood that the volume or number of the capacitor 507 is reduced.

Optionally, if the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the controller 502 does not change the mode of the switching power supply according to the voltage change rate of the chip 501. If the first voltage corresponding to the voltage regulation command is less than the threshold voltage, the controller 502 is used to determine whether the third voltage change rate is greater than the second value, and the third voltage change rate

Wherein, V _a is the first voltage, V _b is the second voltage, the second voltage is obtained from the comparator 509. The chip 501. If the third voltage change rate is greater than the second value, the controller 502 is also used to change the state of the switching power supply, so that the switching power supply is converted from the second mode to the first mode. Among them, in the case that the first voltage corresponding to the voltage regulation command is less than the threshold voltage, the controller can switch the mode according to the voltage change rate, because in the case of medium and light load, the sudden change of the load voltage will not be large, and the smaller value can be used. The capacitor is used to maintain the voltage stability of the load module. When the first voltage corresponding to the voltage regulation command is less than the threshold voltage, it is considered that the load module is under medium and light load. In this way, some smaller capacitors can be reserved to meet the flexible mode conversion requirements of the load module under medium and light loads.

The DVFS power supply system in the embodiment of the present application is described above, and the DVFS power control method in the embodiment of the present application is described below.

Please refer to FIG. 10, which is a schematic flowchart of a DVFS power control method in an embodiment of the application.

In step 1001, the PMU receives the voltage regulation command sent by the chip, and the voltage regulation command corresponds to the first voltage. The voltage regulation command corresponding to the first voltage means that the voltage regulation command includes the first voltage or includes an identifier corresponding to the first voltage.

In step 1002, if the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU changes the state of the switching power supply, so that the switching power supply is converted from the first mode to the second mode, so that the change of the switching power supply can affect the load. The output current range of the module. The load module may be a chip, or some functional modules in the chip, such as CPU, GPU, or other loads that do not belong to the chip. Specifically, the PMU controls the on and off of certain electronic components in the switching power supply to change the state of the switching power supply.

When the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU changes its output mode to the load module. There is no need to wait for the voltage feedback from the comparator to the load module, so the dynamic response time can be reduced.

Optionally, the first mode is DCM, and the second mode is CCM. If the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the PMU changes the state of the switching power supply, so that the switching power supply is converted from DCM to CCM.

Optionally, the switching power supply can output multiple voltage values to the load module, the multiple voltage values include V ₁ , V ₂ , ..., Vn, the multiple voltage values are arranged in ascending order, and n is an integer greater than 1. According to the power change of the load module, multiple voltage values correspond to multiple current ranges. The multiple current ranges include A ₁ , A ₂ ,..., An. Wherein, the threshold voltage is equal to Vx corresponding to Ax, and x is an integer greater than or equal to 1 and less than or equal to n. The current range of Ax is from H milliampere to J milliampere. When the output voltage of the switching power supply to the load module is Vx, the power change of the load module causes the output current to the load module to change from H mA to J mA, which causes the output voltage of the switching power supply to the load module to change to Vc. H can be greater than J or less than J, that is, when the power of the load module increases, the low current of the load module jumps to a high current, and when the power of the load module decreases, the high current of the load module jumps to a low current. The first voltage change rate is greater than or equal to the first value. in,

When the output voltage of the switching power supply to the load module is V _x-1 , the power change of the load module causes the output current to the load module to change from K mA to L mA, resulting in the output of the switching power supply to the load module The voltage change is V _c-1 . V _x-1 and the corresponding _{A x-1, A x-} 1 mA current range of K to L mA, the second voltage change is less than the first value. in,

Optionally, if the first voltage corresponding to the voltage regulation command is less than the threshold voltage, the PMU is used to determine whether the third voltage change rate is greater than the second value. The third rate of voltage change

Wherein, V _a is the first voltage, V _b is the second voltage, the second voltage is obtained from the load according to the comparator module. If the third voltage change rate is greater than the second value, the PMU is also used to change the state of the switching power supply, so that the switching power supply is converted from the second mode to the first mode.

Optionally, the PMU changes the state of the switching power supply according to the voltage regulation instruction, so that the output voltage of the switching power supply to the load module reaches the first voltage. The PMU receives the first information sent by the comparator, where the first information is obtained by the comparator determining that the voltage of the load module reaches the first voltage. After the PMU receives the first information, if the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the state of the switching power supply is changed, so that the switching power supply is converted from the first mode to the second mode.

Optionally, the PMU receives a mode conversion instruction, and the mode conversion instruction is obtained by the chip according to the first voltage corresponding to the voltage regulation instruction being greater than or less than the threshold voltage. After receiving the mode switching command, the PMU changes the state of the switching power supply according to the mode switching command, so that the switching power supply is switched from the first mode to the second mode.

For the description of the DVFS power supply control method in the implementation of this application, reference may be made to the previous description of the DVFS power supply system.

The DVFS power control method in the embodiment of the present application is described above, and the terminal in the embodiment of the present application is described below.

Please refer to FIG. 11, which is a schematic structural diagram of a terminal in an embodiment of the application.

As shown in FIG. 11, the terminal 1100 includes a chip 1110, a PMU 1130, a battery 1140, and a transceiver 1120 coupled to the chip 1110. The chip 1110 may be a CPU, a network processor (network processor, NP), or a combination of a CPU and NP. The processor may also be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The above-mentioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof. The chip 1110 may refer to one processor, or may include multiple processors.

The transceiver 1120 is used to communicate with other terminals or base stations and other equipment. The battery 1140 is used to power the PMU 1130.

The chip 1110 is used to determine whether the voltage needs to be adjusted according to the operating frequency, and if necessary, send a voltage adjustment instruction to the PMU 1130.

The PMU1130 is used to receive the voltage regulation command sent by the chip 1110, and the voltage regulation command corresponds to the first voltage. The voltage regulation command corresponding to the first voltage means that the voltage regulation command includes the first voltage or includes an identifier corresponding to the first voltage. If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU1130 is used to change the state of the switching power supply in the PMU1130, so that the switching power supply is converted from the first mode to the second mode, so that changing the switching power supply can affect the load module The range of output current. The load module may be the chip 1110, or some functional modules in the chip 1110, such as CPU, GPU, or other loads that do not belong to the chip 1110. Specifically, 1130 is used to control the on and off of certain electronic components in the switching power supply to change the state of the switching power supply.

Optionally, the terminal 1100 further includes a memory, and the memory may include a volatile memory (volatile memory), such as a random-access memory (RAM); the memory may also include a non-volatile memory (non-volatile memory) , Such as read-only memory (ROM), flash memory (flash memory), hard disk drive (HDD) or solid-state drive (SSD); memory can also include the above types of memory The combination.

In addition, after the PMU 1130 or the chip 1110 executes the computer-readable instructions in the memory, it can perform all operations that the PMU 1130 or the chip 1110 can perform according to the instructions of the computer-readable instructions. Actions performed in.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical discs and other media that can store program codes.

Claims (13)

1. A dynamic voltage and frequency adjustment DVFS power supply system is characterized in that it includes:

   Chip, power management unit PMU and load module;

   Wherein, the PMU includes a controller and a switching power supply;

   The chip is used to send a voltage regulation instruction to the controller, where the voltage regulation instruction corresponds to a first voltage;

   If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the controller is used to change the state of the switching power supply, so that the switching power supply is converted from the first mode to the second mode to So that the range of output current that the switching power supply can output to the load module is changed.
2. The system according to claim 1, wherein the first mode is a discontinuous conduction mode DCM, and the second mode is a continuous conduction mode CCM;

   The controller is specifically configured to change the state of the switching power supply if the first voltage corresponding to the voltage regulation instruction is greater than a threshold voltage, so that the switching power supply is converted from the DCM to the CCM.
3. The system according to claim 2, wherein the switching power supply can output multiple voltage values to the load module, and the multiple voltage values include V ₁ , V ₂ ,..., Vn, the multiple The voltage values are arranged from small to large, and the n is an integer greater than 1. According to the power change of the load module, the multiple voltage values correspond to multiple current ranges, and the multiple current ranges include A ₁ , A ₂ , ..., An, wherein the threshold voltage is equal to Vx corresponding to Ax, the x is an integer greater than or equal to 1, and less than or equal to n, and the current range of Ax is from H milliampere to J milliampere, When the output voltage of the switching power supply to the load module is the Vx, the power change of the load module causes the output current to the load module to change from the H mA to the J mA, resulting in The output voltage change of the switching power supply to the load module is Vc, and the first voltage change rate is greater than or equal to a first value, wherein the first voltage change rate

   

   When the output voltage of the switching power supply to the load module is V _x-1 , the power change of the load module causes the output current to the load module to change from K mA to L mA, and the V _{x 1} and the corresponding a _x-1, a _x-1 of the current range is the L to the K mA mA, resulting in a change in output voltage of the switching power supply of the load module is V _c-1 , The second voltage change rate is less than the first value, wherein the second voltage change rate

   
4. The system according to claim 3, wherein the system further comprises a comparator;

   If the first voltage corresponding to the voltage regulation command is less than the threshold voltage, the controller is used to determine whether the third voltage change rate is greater than the second value, and the third voltage change rate

   

   Wherein the first voltage V _a, V _b is the second voltage, the second voltage is obtained from the load module is based on the comparison;

   If the third voltage change rate is greater than the second value, the controller is also used to change the state of the switching power supply, so that the switching power supply is converted from the second mode to the first mode .
5. The system according to any one of claims 2 to 4, wherein the system further comprises a comparator;

   The controller is also used to change the state of the switching power supply, so that the output voltage of the switching power supply to the load module reaches the first voltage;

   The comparator is used to determine whether the voltage of the load module reaches the first voltage;

   If yes, the comparator is also used to send first information to the controller;

   The controller is also used to receive the first information;

   The controller is specifically configured to, after the controller receives the first information, if the first voltage corresponding to the voltage regulation instruction is greater than or less than a threshold voltage, the controller is configured to change the switch The state of the power supply such that the switching power supply is converted from the first mode to the second mode.
6. The system according to any one of claims 1 to 5, wherein the chip is further configured to determine whether the first voltage corresponding to the voltage regulation instruction is greater than or less than the threshold voltage;

   If so, the chip is also used to send a mode conversion instruction to the controller;

   The controller is specifically configured to change the state of the switching power supply according to the mode conversion instruction, so that the switching power supply is converted from the first mode to the second mode.
7. A DVFS power supply control method is characterized in that it includes:

   The power management unit PMU receives a voltage adjustment instruction sent by the chip, where the voltage adjustment instruction corresponds to the first voltage;

   If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU changes the state of the switching power supply, so that the switching power supply is converted from the first mode to the second mode, so as to change the Switching power supply can output current range of load module.
8. The method according to claim 7, wherein the first mode is a discontinuous conduction mode DCM, and the second mode is a continuous conduction mode CCM;

   If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU changing the state of the switching power supply so that the switching power supply is converted from the first mode to the second mode includes:

   If the first voltage corresponding to the voltage regulation command is greater than the threshold voltage, the PMU changes the state of the switching power supply, so that the switching power supply is converted from DCM to CCM.
9. The method according to claim 8, wherein the switching power supply can output multiple voltage values to the load module, the multiple voltage values including V ₁ , V ₂ ,..., Vn, the multiple The voltage values are arranged from small to large, and the n is an integer greater than 1. According to the power change of the load module, the multiple voltage values correspond to multiple current ranges, and the multiple current ranges include A ₁ , A ₂ , ..., An, wherein the threshold voltage is equal to Vx corresponding to Ax, the x is an integer greater than or equal to 1, and less than or equal to n, and the current range of Ax is from H milliampere to J milliampere, When the output voltage of the switching power supply to the load module is the Vx, the power change of the load module causes the output current to the load module to change from the H mA to the J mA, resulting in The output voltage change of the switching power supply to the load module is Vc, and the first voltage change rate is greater than or equal to a first value, wherein the

   

   

   When the output voltage of the switching power supply to the load module is V _x-1 , the power change of the load module causes the output current to the load module to change from K mA to L mA, and the V _{x 1} and the corresponding a _x-1, a _x-1 of the current range is the L to the K mA mA, resulting in a change in output voltage of the switching power supply of the load module is V _c-1 , The second voltage change rate is less than the first value, wherein the

   
10. The method according to claim 9, wherein if the first voltage corresponding to the voltage regulation command is less than a threshold voltage, the PMU is used to determine whether the third voltage change rate is greater than the second value, so The third rate of voltage change

    

    Wherein the first voltage V _a, V _b is the second voltage from the second voltage to obtain a load module in accordance with the comparator;

    If the third voltage change rate is greater than the second value, the PMU is also used to change the state of the switching power supply, so that the switching power supply is converted from the second mode to the first mode.
11. The method according to any one of claims 8 to 10, wherein the PMU changes the state of the switching power supply according to the voltage regulation instruction, so that the output voltage of the switching power supply to the load module reaches The first voltage;

    Receiving, by the PMU, first information sent by the comparator, where the first information is obtained by the comparator determining that the voltage of the load module reaches the first voltage;

    If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU changing the state of the switching power supply so that the switching power supply is converted from the first mode to the second mode includes:

    After the PMU receives the first information, if the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the state of the switching power supply is changed so that the switching power supply is switched from the The first mode is converted to the second mode.
12. The method according to any one of claims 7 to 11, wherein the method further comprises:

    The PMU receives a mode conversion instruction, where the mode conversion instruction is obtained by the chip according to the first voltage corresponding to the voltage regulation instruction being greater than or less than the threshold voltage;

    If the first voltage corresponding to the voltage regulation command is greater than or less than the threshold voltage, the PMU changing the state of the switching power supply so that the switching power supply is converted from the first mode to the second mode includes:

    The PMU changes the state of the switching power supply according to the mode conversion instruction, so that the switching power supply is converted from the first mode to the second mode.
13. A terminal, characterized in that the terminal includes the dynamic voltage frequency adjustment DVFS power supply system according to any one of the preceding claims 1 to 6.

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