Voltage regulating circuit, electronic device, and voltage regulating method

Abstract

The application discloses a voltage regulating circuit, an electronic device and a voltage regulating method. By increasing the value of the voltage V LPM output by the VRM after entering the LPM, the output voltage difference to be reduced during the process of switching from the NPM to the LPM is reduced, and the current to be discharged is reduced. Thus, the protection mechanism triggered due to the excessive discharge current can be avoided, and the electronic device can be prevented from being shut down or restarted due to the PG of the VRM.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic circuit, in particular to a voltage regulating circuit, an electronic device and a voltage regulating method. BACKGROUND

[0002] The demand voltage, load current and the like of some modules in an electronic device, such as a central processor unit (CPU), a graphics processing unit (GPU), an application specific integrated circuit (ASIC) and the like, are dynamically changed. For example, the load voltage and current of the CPU are greatly different when opening a document and opening a game. Thus, the core voltage Vcore required by each module is different, and may instantaneously increase or decrease, and the device power supply outputting a fixed voltage cannot meet the voltage demand of the above modules.

[0003] To this end, a power management integrated circuit (PMIC) is provided in the electronic device, which encapsulates multiple output power supplies together and has high integration. A plurality of voltage regulating modules (VRM) can be integrated in the PMIC, which is used to convert a larger direct current voltage (such as 12V) output by the power supply into a stable smaller direct current voltage (such as 0.5V-2V), and can adjust the voltage size output in real time according to the load demand, so as to meet the working voltage demand of the above load. SUMMARY

[0004] The present application provides a voltage regulating circuit, an electronic device and a voltage regulating method, which can avoid the shutdown or restart of the electronic device caused by the PG of the VRM.

[0005] In a first aspect, a voltage regulation method is provided, applied to an electronic device. The electronic device includes a voltage regulation circuit, the voltage regulation circuit including a first VRM; the first VRM includes: a PWM controller, a driver, a first switching transistor and a second switching transistor, an inductor, a capacitor, and a comparator; the output terminal of the PWM controller is connected to the input terminal of the driver, and the PWM controller is used to output a PWM voltage signal to the driver; for the first switching transistor, the drain is connected to the high-voltage input terminal of the first VRM, the gate is connected to the first output terminal of the driver, and the source is connected to the first terminal of the inductor; for the second switching transistor, the drain is connected to the first terminal of the inductor, the gate is connected to the second output terminal of the driver, and the source is grounded; the second terminal of the inductor and the first terminal of the capacitor are both connected to the high-voltage output terminal of the first VRM, and the second terminal of the capacitor is grounded; the first input terminal of the comparator is connected to the source of the second switching transistor, the second input terminal of the comparator is used to receive a preset voltage, and the output terminal of the comparator is connected to the gate of the first switching transistor and the gate of the second switching transistor;

[0006] The method of the first aspect includes: the electronic device detecting that the voltage output by the first VRM is lower than a preset PG value; the electronic device modifying the voltage output by the first VRM in low power mode from a first value to a second value, the second value being greater than the first value.

[0007] The first approach is implemented by increasing the output voltage V after VRM enters LPM. LPM The value of the voltage rating is reduced to decrease the output voltage difference required during the VRM's switch from NPM to LPM, thereby reducing the current that needs to be discharged. This prevents excessive discharge current from triggering the protection mechanism, and consequently avoids electronic equipment shutdown or restart due to VRM PG (Power Generation Regulator).

[0008] In conjunction with the first aspect, in some embodiments, after the electronic device detects that the voltage output by the first VRM is lower than a preset PG value, the method may further include: restarting the electronic device; or, shutting down the electronic device and turning it on after receiving a power-on operation. That is, the electronic device will automatically restart or shut down after a PG problem occurs.

[0009] In some implementations, before the electronic device restarts or shuts down, the method may further include: the electronic device displaying a first prompt message, the first prompt message being used to inform the user that the electronic device will restart or shut down due to PG reasons.

[0010] In some embodiments, after the electronic device restarts or powers on, the method may further include: the electronic device displaying a second prompt message, the second prompt message being used to prompt the user that the electronic device restarts or powers off due to PG reasons.

[0011] In some embodiments, the electronic device modifies the voltage output by the first VRM in the low power mode from a first value to a second value during a reboot or a power-on process.

[0012] In combination with the first aspect, in some embodiments, the electronic device further comprises a register, and after the electronic device detects that the voltage output by the first VRM is lower than the preset PG value, the method further comprises: the electronic device sets a bit position corresponding to the first VRM in the register to 1.

[0013] In some embodiments, before the electronic device modifies the voltage output by the first VRM in the low power mode from a first value to a second value, the method further comprises: the electronic device reads a value of 1 from a bit position corresponding to the first VRM in the register.

[0014] In combination with the first aspect, in some embodiments, the second value = V LPM0 +N*step, V LPM0 is a preset value, N is a number of times that the voltage output by the first VRM is historically lower than the PG value, and step is a preset value; or the second value = V LPM0 +N*step, V LPM0 is a current voltage value output by the first VRM in the low power mode, and N and step are preset values; or the second value is equal to a voltage value output by the first VRM in a normal mode.

[0015] In combination with the first aspect, in some embodiments, the electronic device detects that the voltage output by the first VRM is lower than the preset PG value after: the electronic device controls the first switch tube to be off and the second switch tube to be on; the voltage output by the first VRM discharges a current through the second switch tube; a voltage received by a first input end of the comparator is greater than a preset voltage of a second input end of the comparator, and an output end of the comparator outputs a low level; and the second switch tube is closed.

[0016] In combination with the first aspect, in some embodiments, after the electronic device modifies the voltage output by the first VRM in the low power mode from a first value to a second value, the method further comprises: the electronic device controls the first VRM to enter a normal mode; and the electronic device controls the first VRM to enter the low power mode from the normal mode.

[0017] In some embodiments, the voltage regulation circuit further comprises a voltage control unit, and the electronic device controls the first VRM to enter the normal mode, specifically comprising: the electronic device controls the first switch tube and the second switch tube of the first VRM to be alternately turned on through the voltage control unit; and the electronic device controls the first VRM to enter the low-power consumption mode from the normal mode, specifically comprising: the electronic device controls the first switch tube to be turned off and the second switch tube to be turned on through the voltage control unit first, and then controls the first switch tube and the second switch tube to be alternately turned on through the voltage control unit after the voltage output by the first VRM is reduced to the second value.

[0018] In a second aspect, an electronic device is provided, which comprises a voltage regulation circuit, and the voltage regulation circuit comprises a first VRM; the first VRM comprises a PWM controller, a driver, a first switch tube and a second switch tube, an inductor, a capacitor, and a comparator; an output end of the PWM controller is connected to an input end of the driver, and the PWM controller is configured to output a PWM voltage signal to the driver; for the first switch tube, a drain electrode is connected to a high-voltage input end of the first VRM, a gate electrode is connected to a first output end of the driver, and a source electrode is connected to a first end of the inductor; for the second switch tube, a drain electrode is connected to the first end of the inductor, a gate electrode is connected to a second output end of the driver, and a source electrode is grounded; a second end of the inductor and a first end of the capacitor are both connected to a high-voltage output end of the first VRM, and a second end of the capacitor is grounded; a first input end of the comparator is connected to a source electrode of the second switch tube, a second input end of the comparator is configured to receive a preset voltage, and an output end of the comparator is connected to a gate electrode of the first switch tube and a gate electrode of the second switch tube; and the electronic device is configured to perform the method according to the first aspect or any one of the embodiments of the first aspect.

[0019] In combination with the second aspect, in some embodiments, the electronic device further comprises a power supply, and the high-voltage input end of the first VRM is connected to a high-voltage output end of the power supply.

[0020] In combination with the second aspect, in some embodiments, the high-voltage input end of the first VRM is connected to a high-voltage output end of the power supply.

[0021] In a third aspect, a chip system is provided, and the chip system comprises a voltage regulation circuit, and the voltage regulation circuit comprises a first VRM; the first VRM comprises a PWM controller, a driver, a first switch tube and a second switch tube, an inductor, a capacitor, and a comparator; an output terminal of the PWM controller is connected to an input terminal of the driver, and the PWM controller is configured to output a PWM voltage signal to the driver; for the first switch tube, a drain electrode is connected to a high-voltage input terminal of the first VRM, a gate electrode is connected to a first output terminal of the driver, and a source electrode is connected to a first terminal of the inductor; for the second switch tube, a drain electrode is connected to the first terminal of the inductor, a gate electrode is connected to a second output terminal of the driver, and a source electrode is grounded; a second terminal of the inductor and a first terminal of the capacitor are both connected to a high-voltage output terminal of the first VRM, and a second terminal of the capacitor is grounded; a first input terminal of the comparator is connected to the source electrode of the second switch tube, a second input terminal of the comparator is configured to receive a preset voltage, and an output terminal of the comparator is connected to the gate electrode of the first switch tube and the gate electrode of the second switch tube; the chip system further comprises one or more processors, and the processors are configured to invoke computer instructions to perform the method of the first aspect or any of the implementation manners of the first aspect.

[0022] In a fourth aspect, a readable storage medium is provided, and the readable storage medium comprises instructions, and when the instructions are executed on a device, the device is caused to perform the method of the first aspect or any of the implementation manners of the first aspect.

[0023] In a fifth aspect, a program product is provided, and when the program product is executed on a device, the device is caused to perform the method of the first aspect or any of the implementation manners of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A structure diagram of a single-phase VRM provided by an embodiment of the present application;

[0025] Figure 2 A working principle schematic diagram of a DVS provided by an embodiment of the present application;

[0026] Figure 3 A structure diagram of a voltage regulation circuit comprising a protection mechanism provided by an embodiment of the present application;

[0027] Figure 4 A user interface displayed by an electronic device provided by an embodiment of the present application;

[0028] Figure 5 A flowchart of a voltage regulation method provided by an embodiment of the present application;

[0029] Figure 6 A structure diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and exhaustively in combination with the drawings.

[0031] Firstly, several concepts involved in the present application will be introduced.

[0032] VRM

[0033] The VRM is integrated in the PMIC, and is used to convert a large DC voltage (such as 12V) output by a power supply in an electronic device into a stable small DC voltage (such as 0.5V-2V), and output to a CPU, a GPU, an ASIC and the like, so as to meet the working voltage requirements of the above modules.

[0034] Figure 1 A schematic diagram of a single-phase voltage regulation module (single-phase VRM) 10. The single-phase VRM 10 can also be referred to as a single-phase DC-DC Buck type step-down circuit.

[0035] The single-phase VRM 10 can include a pulse-width modulation (PWM) controller 101, a driver 102, a high-side power stage field-effect transistor (HS-FET) M1, a low-side power stage field-effect transistor (LS-FET) M2, an inductor L, and a capacitor C. The single-phase VRM 10 further includes a first input end and a second input end, a first output end and a second output end.

[0036] The first input end, also referred to as a high-voltage input end, is connected to a high-voltage output end of a device power supply, and is used to receive an input voltage Vin; the second input end, also referred to as a low-voltage input end, is connected to a low-voltage output end of the device power supply. The first output end, also referred to as a high-voltage output end, is connected to one input end of a post-stage load, and is used to output a core voltage Vcore required by the post-stage load; the second output end, also referred to as a low-voltage output end, is connected to another input end of the post-stage load. The second input end and the second output end can be connected to a ground end (GND). The input voltage Vin can be an output voltage of the device power supply, and the device power supply can be a battery. The post-stage load refers to a CPU, a GPU, an ASIC and the like which have special working voltage requirements.

[0037] The PWM controller 101 is connected to the driver 102 for outputting a PWM voltage signal to the driver 102. The PWM voltage signal can be generated by a comparator CP in the PWM controller 101, which compares a fixed reference voltage Vref with a core voltage Vcore output by the single-phase VRM 10. The PWM controller 101 is configured to control the duty cycle of the PWM waveform according to the real-time demand of the load, so that the output voltage is stabilized at the required value of the core voltage Vcore. The PWM voltage signal output by the PWM controller 101 is an analog signal with high and low levels alternating in sequence. When the PWM voltage signal is at a high level, the PWM voltage signal is in a positive half cycle; when the PWM voltage signal is at a low level, the PWM voltage signal is in a negative half cycle.

[0038] The driver 102 can include a control logic circuit 1011 and two driver circuits 1012, 1013.

[0039] M1 can be a P-type field effect transistor, and M2 can be an N-type field effect transistor. M1 can be referred to as a first switch tube, and M2 can be referred to as a second switch tube.

[0040] The M1 drain (D) is connected to the first input, the M1 gate (G) is connected to the output of the driver circuit 1012 (also referred to as the first output of the driver 102), and the M1 source (S) is connected to the first end of L. The M2 drain (D) is connected to the first end of L, the M2 gate (G) receives the output of the driver circuit 1013 (also referred to as the second output of the driver 102), and the M2 source (S) is connected to the second input. The second end of L is connected to the first output for outputting the required core voltage Vcore to the subsequent load. The first end of C is connected to the second end of L, and the second end of C is connected to the second output.

[0041] When the PWM voltage signal output by the PWM controller 101 is in the positive half cycle, the control logic circuit 1011 in the driver 102 generates a signal for the driving circuit 1012 to output the first driving signal S1 to M1, M1 is turned on, M2 is turned off, the current flows through M1 and L to charge C, and L generates a self-induced electromotive force. When the PWM voltage signal output by the PWM controller 101 is in the negative half cycle, the control logic circuit 1011 in the driver 102 generates a signal for the driving circuit 1013 to output the second driving signal S2 to M2, M1 is turned off, M2 is turned on, and the current in L will try to maintain its existing magnetic field, which will cause the voltage to reverse and accumulate in C. When the electromotive force on L decreases or is small, C outputs a power supply voltage to the subsequent load. In this way, under the action of the PWM voltage signal, the driver 102 controls the frequent switching of M1 and M2 to provide continuous and stable current and voltage to the subsequent load.

[0042] One phase of the VRM refers to a circuit composed of a driver 102, M1, M2, an inductor L, and a capacitor C.

[0043] To meet the requirements of different loads and improve output power, a multi-phase voltage regulation module (multi-phase VRM) is introduced, also known as a multi-phase DC-DC Buck type step-down circuit. The multi-phase VRM 20 can include a PWM controller and multiple single-phase circuits that are interleaved and connected in parallel. Each single-phase circuit has Figure 1 The single-phase circuits shown in the figure are the same in structure, and the first output end of each single-phase circuit is connected to an input end of the subsequent load for outputting the core voltage Vcore required by the subsequent load. The PWM controller 101 is used to provide a PWM voltage signal to part or all of the single-phase circuits in the multiple paths. The current output by the multi-phase VRM 20 to the subsequent load is the sum of the output currents of the single-phase circuits started in the multiple paths.

[0044] The PMIC can include one or more VRMs, and different VRMs can be connected to different loads for providing voltage to different loads.

[0045] Dynamic voltage scaling (DVS)

[0046] Electronic devices, especially mobile electronic devices, have low power consumption requirements for power supply, so most electronic devices have DVS function to reduce device power consumption. The voltage required by the load in full speed state and idle state is different, based on which, in DVS, the VRM provides two working modes of normal power mode (NPM) and low power mode (LPM). The voltage provided by the VRM to the load in NPM is greater than the voltage provided by the VRM to the load in LPM.

[0047] Reference Figure 2 , Figure 2 Exemplary working principle of DVS is shown.

[0048] As Figure 2 shown, the working circuit of DVS at least includes: PMIC 201, voltage control unit 202, load 203.

[0049] One or more VRMs are integrated in PMIC 201, which can be single-phase VRM or multi-phase VRM, and the specific structure can refer to the related description in the foregoing. The PMIC 201 also includes voltage control unit 202.

[0050] Each VRM in PMIC 201 is connected with a load, which is used to output the required supply voltage for the connected load. Figure 2 Only one VRM 2011 and one load 203 connected therewith are exemplarily shown in the figure. The load 203 has a state output pin connected to the voltage control unit 202, which is used to feedback the current state of the load 203, such as full speed state or idle state, and the core voltage requirement in full speed state.

[0051] The voltage control unit 202 and the load 203, VRM 2011, etc. can be connected through digital bus such as I2C (inter-integrated circuit). The voltage control unit 202 is used to dynamically adjust the voltage output by the VRM 2011, and adjust the frequency of the load 203.

[0052] If the load 203 is in full speed state, the voltage control unit 202 controls the VRM 2011 to enter NPM, and the VRM 2011 outputs voltage V NPM to the load 203. In this case, the VRM 2011 provides voltage to the load 203 according to the working principle introduced in the foregoing, that is, the PWM controller 101 outputs a PWM voltage signal, M1 and M2 frequently switch to provide continuous and stable voltage to the rear load. The voltage requirement V NPM of the load 203 in full speed state can be dynamically changed.

[0053] If the load 203 is in idle state, the voltage control unit 202 controls the VRM 2011 to enter LPM, and the VRM 2011 outputs a voltage V LPM to the load 203. In this case, the PWM controller 101 of the VRM 2011 can first output a continuous low voltage signal, so that M1 is off and M2 is on, and the output voltage is reduced from V NPM to V LPM . Then, the PWM controller 101 can output a PWM voltage signal, so that the output voltage is maintained at V LPM . Generally, V LPM , V NPM are preset values, and V LPM is less than V NPM .

[0054] During the process of switching the VRM 2011 from NPM to LPM, M1 is off and M2 is on, so the energy originally stored in the capacitor C of the VRM, i.e., the V NPM output by the VRM 2011, will be discharged through a loop formed by the high voltage output end L of the VRM 2011, the second end to the first end of L, the drain (D) of M2, the source (S) of M2, and the ground, so as to reduce the V NPM to V LPM . Specifically, the VRM includes a voltage feedback (FB) pin, and the voltage control unit 202 can control the accuracy of the voltage output by the VRM 2011 according to the feedback of the FB pin. After the voltage output by the VRM 2011 is reduced to V LPM , the voltage control unit 202 can control M1 and M2 to be alternately turned on, so as to control the voltage output by the VRM 2011 to be maintained at V LPM .

[0055] During the discharging process, there is a current in M2, and the current is too large to damage M2. In order to avoid damage to M2 during the discharging process, a VRM 2011 as shown in Figure 3 is provided.

[0056] Figure 3 The VRM 2011 as shown in Figure 3 provides a protection mechanism to avoid device damage. As shown in Figure 3 , the voltage regulation circuit includes a PMIC 201, and it adds a comparator CP to the VRM 2011 in the PMIC 201 as shown in Figure 2 . The negative input end V- of the comparator CP is connected to the source (S) of M2, and the positive input end V+ is used to receive a fixed reference voltage V limit, the output end is connected with the gate (G) of M1 and the gate (G) of M2. The positive input end V+ of the comparator CP can be referred to as a second input end, and the negative input end V- can be referred to as a first input end.

[0057] M2 source (S) and ground end has impedance (for example, can be 1-1.5Ω), when the leakage current is too large, the voltage received by the negative input end V- of the comparator CP will be greater than the reference voltage V limit , the CP output low level, M2 is cut off, so as to avoid M2 damage. The protection mechanism is autonomously completed by hardware, and in the process of switching the VRM 2011 from the NPM to the LPM, the leakage current may be too large due to sudden decrease of the voltage required by the load and the like, so as to trigger the above protection mechanism.

[0058] After triggering the protection mechanism, M2 is cut off, and since M1 has been cut off in the leakage process, M1 and M2 can be considered to be turned off after M2 is cut off. The voltage output by the VRM 2011 will not be high due to the cut-off of M1, and the energy originally stored in C will be discharged, but the leakage current cannot be discharged through the loop formed by the high voltage output end of the VRM 2011, the second end to the first end of L, the drain (D) of M2, the source (S) of M2, and the ground end, and can only be discharged through the load. When the leakage current is discharged through the load, the voltage output by the VRM 2011 will decrease NPM continuously until it is lower than the power good (PG) value. If the voltage output by the VRM 2011 is lower than the PG value, the electronic device considers that the current VRM 2011 cannot work safely and reliably, and will trigger shutdown or restart. The PG value can be a certain proportion of the preset value, and different VRMs can correspond to different PG values.

[0059] It can be seen that the VRM 2011 shown in Figure 3 may cause the voltage output by the VRM 2011 to be lower than the PG value during the switching from the NPM to the LPM, and further cause the electronic device to shut down or restart. Not limited to this, other reasons can also cause the voltage output by the VRM 2011 to be lower than the PG value, and further cause the electronic device to shut down or restart, for example, insufficient output capacity of the VRM 2011 when switching from the NPM to the LPM causes shutdown or restart.

[0060] There are various reasons why an electronic device may shut down or restart, such as user-triggered shutdown or restart, or due to battery overheating. To clarify the cause of shutdown or restart, the electronic device in this application is equipped with a register to store information on whether each VRM in the PMIC shut down or restarted due to its output voltage falling below the PG value. For example, the electronic device can be equipped with a 16-bit register, with each bit corresponding to a VRM. If a VRM shuts down or restarts due to its output voltage falling below the PG value, the VRM reports an interrupt to the register before the electronic device shuts down or restarts. The register sets the bit corresponding to that VRM to 1, indicating that the corresponding VRM shut down or restarted due to the PG value. Afterward, the electronic device shuts down or restarts. If the data in the register is not read after restarting, it will not be cleared, so the register can still reflect the cause of the restart after restarting.

[0061] refer to Figure 4 , Figure 4 An example is shown of the user interface displayed when an electronic device restarts due to a PG in the VRM.

[0062] like Figure 4 As shown, the user interface displayed by the electronic device before restarting includes a prompt message 401, which informs the user that the electronic device will restart because the voltage output by the VRM is lower than the PG. For example, the prompt message 401 could be the text "The device will restart because the power supply output voltage is lower than normal." In some embodiments, Figure 4 The displayed message 401 can also indicate to the user how long the device will be restarting, and can also display a restart countdown, etc. The electronic device displays... Figure 4 After viewing the user interface shown, you can restart.

[0063] In some implementations, before restarting, the electronic device can first read the register used to store PG information. If the information stored in the register indicates that the restart was caused by the VRM's PG, then the electronic device can display... Figure 4 The user interface shown.

[0064] In some implementations, the electronic device may also read the register used to store PG information again after restarting. If the information stored in the register indicates that the restart was caused by the PG of the VRM, the electronic device may also display a similar user interface to remind the user that the electronic device was previously restarted due to the PG of the VRM.

[0065] In other implementations, when an electronic device shuts down due to a PG in the VRM, a similar user interface may be displayed to prompt the user before or after shutdown and restart.

[0066] The message displayed by an electronic device before it restarts or shuts down due to PG (Power Generation Policy) can be referred to as the first message (e.g., ...). Figure 4 The prompt message 401 shown, which appears after restarting or shutting down, can be referred to as the second prompt message.

[0067] When electronic devices are turned off or restarted too frequently, users will be unable to use the devices normally, which will seriously affect the user experience and increase the rate of device cancellation.

[0068] Improved voltage regulation circuit and voltage regulation method

[0069] To address the issue of shutdown or restart caused by PG when the VRM of an electronic device switches from NPM to LPM, this application provides an improved voltage regulation circuit.

[0070] The improved voltage regulation circuit provided in this application has a structure and Figure 3 The circuit shown is the same, except that the improved voltage regulation circuit modifies the output voltage V after VRM enters LPM through software adjustment. LPM The value of V. Specifically, by increasing V. LPM The value of is reduced to decrease the output voltage difference that needs to be reduced during the VRM's switch from NPM to LPM, thereby reducing the current that needs to be discharged. This can prevent excessive discharge current from triggering the protection mechanism, and thus prevent electronic equipment from shutting down or restarting due to the VRM's PG.

[0071] refer to Figure 5 , Figure 5 A flowchart illustrating a voltage regulation method provided in an embodiment of this application. This method is applied to an electronic device including an improved voltage regulation circuit. The method may include the following steps:

[0072] S101, the voltage of the first VRM output in the PMIC 201 of the electronic device is lower than the PG value.

[0073] When the PMIC 201 of an electronic device supplies power to a downstream load, the voltage output by its first VRM may be lower than the PG value. The reason for this lower output voltage is explained above. The first VRM can be any VRM within the PMIC 201, for example... Figure 3 VRM 2011 in the middle.

[0074] S102, The electronic device restarts, or the electronic device is turned off and then turns on in response to the user's power-on operation after being turned off.

[0075] A restart refers to an electronic device automatically shutting down and then turning on again without user intervention. In contrast, an electronic device that has been shut down requires manual intervention from the user, such as by pressing and holding the power button, to turn on again.

[0076] The electronic device can output prompt information through a displayed user interface before or after restarting, before or after shutting down and then starting up, to prompt the user that a PG problem has occurred.

[0077] In S103, the electronic device modifies the V LPM from the first value to the second value, where the second value is greater than the first value.

[0078] In the embodiments of the present application, the electronic device can perform S103 during the restarting process or during the starting process, or can perform S103 immediately after restarting or starting up.

[0079] The electronic device modifies the V LPM from the first value to the second value, where the second value is greater than the first value.

[0080] Exemplarily, the following modification methods can be included:

[0081] 1. Stepwise lifting of V LPM . For example, the second value = V LPM0 +N*step, where V LPM0 can be the V LPM corresponding to the first VRM preset by the electronic device when it is shipped (for example, it can be 0.5V), N can be the number of times that the PG problem has occurred in the history of the first VRM, and step is a preset voltage lift (for example, it can be 0.05V). If the electronic device has the PG problem for the first time, the V LPM of the first VRM is modified from V LPM0 to V LPM0 +1*step; if the electronic device has the PG problem for the second time, the V LPM of the first VRM is modified from V LPM0 to V LPM0 +2*step, and so on. In other words, each time the PG problem occurs, the electronic device increases the value of the V LPM corresponding to the VRM by step. Stepwise lifting of V LPM can keep the V LPM at a low value, which can reduce the power consumption of the VRM after it enters the LPM.

[0082] 2. Cross-step lifting of V LPM . For example, the second value = V LPM0 +N*step, where V LPM0 here can refer to the current V LPM value, and N can be directly set to 10 or a larger value, so that the V LPM is lifted by a large amount when the PG problem occurs once, to avoid the PG problem from occurring again subsequently.

[0083] 3. Directly put V LPM The value is set to V NPM Consistent.

[0084] After executing S103, V LPM The value of V is boosted. NPM and V LPM The voltage difference between them is reduced. Therefore, during the switching process from NPM to LPM, the first VRM discharges current through the loop formed by the high-voltage output terminal of the first VRM, the second terminal to the first terminal of L, the drain (D) of M2, the source (S) of M2, and the ground terminal. Due to the small voltage difference of the discharged current, the protection mechanism is unlikely to be triggered, and thus the current can continue to be discharged through M2 to reduce the voltage difference between them. NPM Reduce to V LPM This eliminates the need to discharge current through the load, thus preventing the PG problem from recurring due to the first VRM, and consequently preventing the electronic equipment from shutting down or restarting.

[0085] In some implementations, if the first VRM experiences a PG problem again, the process can be repeated. Figure 5 The method shown continues to raise V. LPM Until the first VRM no longer has PG issues.

[0086] As can be seen, the voltage regulation method provided in this application provides a solution for PG faults in PMIC, which can improve power supply stability, enhance user experience, and reduce the rate of product failure.

[0087] electronic devices

[0088] The electronic devices disclosed in this application can be mobile phones, tablets, desktop computers, desktop computers with touch-sensitive surfaces or touch panels, laptops, smart screens, wearable devices (such as smartwatches, smart bracelets, etc.), augmented reality (AR) devices, virtual reality (VR) devices, artificial intelligence (AI) devices, in-vehicle systems, smart headphones, game consoles, Internet of Things (IoT) devices, or smart home devices, etc.

[0089] refer to Figure 6 , Figure 6 This is a schematic diagram of the hardware structure of an electronic device 100 provided in an embodiment of this application. The electronic device 100 is used in the voltage regulation method provided in this embodiment.

[0090] like Figure 6As shown, the electronic device 100 can include a power supply 1001, a PMIC 1002, a processor 1003, a memory 1004, and a register 1005.

[0091] The power supply 1001 can be a battery, which can be charged in a wired or wireless manner, and can also supply power to various modules in the electronic device through the PMIC 1002.

[0092] The PMIC 1002 is the same as the PMIC 201 mentioned above, and the relevant description can be referred to. The PMIC 1002 is connected to the power supply 1001, the processor 1003, and other load modules, and includes a VRM for receiving a power supply voltage output by the power supply 1001 to supply power to the processor 1003 and other load modules. The PMIC 1002 can also be used to monitor battery capacity, battery cycle times, battery health status (leakage, impedance), and other parameters. In some other embodiments, the PMIC 1002 can also be disposed in the processor 1003.

[0093] The PMIC 1002 further includes a voltage control unit 1000, which is the same as the voltage control unit 202 mentioned above, and the relevant description can be referred to. The voltage control unit 1000 is used to control the VRM 2011 to enter NPM or LPM, that is, to control the VRM to output V NPM or V LPM .

[0094] The processor 1003 can include one or more processing units, for example: the processor 1003 can include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units can be independent devices or can be integrated into one or more processors.

[0095] The processor 1003 is used to modify the V LPM of the VRM when the VRM in the PMIC 1002 has a PG problem, and the specific modification method can be referred to the relevant description of S103 in Figure 5 .

[0096] The memory 1004 can be used to store computer executable program code, which can include instructions. The processor 1003 performs various functional applications and data processing of the electronic device 100 by running the instructions stored in the memory 1004. The memory 1004 can include a program storage area and a data storage area. In a specific implementation, the memory 1004 can include a high-speed random access memory, and can also include a non-volatile memory, such as one or more disk storage devices, flash memory devices, or other non-volatile solid-state storage devices.

[0097] The register 1005 is used to store information about whether each VRM in the PMIC is shut down or restarted due to the output voltage being lower than the PG value. The register 1005 can be disposed in the memory 1004 or the processor 1003.

[0098] The loads mentioned in the present application can include, but are not limited to, GPU, AP, ASIC and the like modules, and the corresponding VRM in the PMIC 1002 is configured to reduce the power supply voltage output by the power supply 1001 to the core voltage required by the corresponding load module and then provide it to the corresponding load module.

[0099] In combination with the structure of the electronic device 100, the flow of the voltage regulation method executed by the cooperation of the modules can include the following steps:

[0100] Step 1. The voltage output by the first VRM in the PMIC 1002 is lower than the PG value.

[0101] Step 2. The PMIC 1002 reports an interrupt to the register 1005, and the register 1005 sets the bit position representing the first VRM to 1.

[0102] Step 3. The processor 1003 controls the electronic device 100 to restart or shut down in response to step 1, and if the electronic device 100 is shut down, it needs to receive a user input power-on operation.

[0103] Step 4. The processor 1003 reads the information in the register 1005 and learns that the bit position representing the first VRM is set to 1, so the electronic device 100 detects that the first VRM has a PG problem.

[0104] Step 5. The processor 1003 modifies the V LPM .

[0105] Step 6, after the electronic device 100 is restarted or powered on, the first VRM in the PMIC 1002 supplies power to the subsequent load, and the voltage control unit 1000 controls the first VRM to follow the modified V LPM Switch from NPM to LPM.

[0106] Specifically, the voltage control unit 1000 controls the PWM controller in the first VRM to output a PWM voltage signal, so that the first VRM enters NPM, and the preset V LPM ; the voltage control unit 1000 controls the PWM controller in the first VRM to first output a low voltage signal, so that M1 is cut off and M2 is turned on, and the output voltage is reduced from V NPM to V LPM , and then controls the PWM controller to output a PWM voltage signal, so that the output voltage is maintained at V LPM .

[0107] As shown in Figure 6 , the electronic device 100 can further include a wireless communication module 1006, a mobile communication module 1007, an antenna 1006A, an antenna 1007A, a sensor module 1009, a focusing motor 1010, a camera 1011, a display screen 1012, and the like. The sensor module 1009 can include a gyroscope sensor 1009A, an acceleration sensor 1009B, an ambient light sensor 1009C, an image sensor 1009D, a distance sensor 1009E, and the like. The wireless communication module 1006 can include a WLAN communication module, a Bluetooth communication module, and the like. The parts of the electronic device can transmit data through a bus.

[0108] The wireless communication function of the electronic device 100 can be realized by the antenna 1006A, the antenna 1007A, the mobile communication module 1007, the wireless communication module 1006, the modem processor, and the baseband processor, and the like.

[0109] The antenna 1006A and the antenna 1007A can be used to transmit and receive electromagnetic wave signals. Each antenna in the electronic device 100 can be used to cover a single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization rate of the antennas.

[0110] The mobile communication module 1007 can provide a solution including 2G / 3G / 4G / 5G wireless communication applied to the electronic device 100. The mobile communication module 1007 can include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), and the like. The mobile communication module 1007 can receive electromagnetic waves by the antenna 1007A, and perform filtering, amplification, and the like on the received electromagnetic waves, and transmit to the modem processor for demodulation. The mobile communication module 1007 can also amplify the signal modulated by the modem processor, and convert it into electromagnetic waves by the antenna 1007A.

[0111] The modem processor can include a modulator and a demodulator. The modulator is configured to modulate a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is configured to demodulate a received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. The low-frequency baseband signal processed by the baseband processor is transmitted to the application processor. The application processor outputs a sound signal through an audio device, or displays an image or video through the display screen 1012.

[0112] The wireless communication module 1006 can provide a wireless communication solution applied to the electronic device 100, including wireless local area networks (WLAN), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR), etc. The wireless communication module 1006 can be one or more devices integrated with at least one communication processing module. The wireless communication module 1006 receives electromagnetic waves via the antenna 1006A, performs frequency modulation and filtering processing on the electromagnetic wave signal, and transmits the processed signal to the processor 1003. The wireless communication module 1006 can also receive a signal to be transmitted from the processor 1003, perform frequency modulation and amplification, and convert it into electromagnetic wave radiation via the antenna 1006A.

[0113] The gyroscope sensor 1009A can be used to determine the motion posture of the electronic device 100. In some embodiments, the angular velocity of the electronic device 100 around three axes (i.e., x, y, and z axes) can be determined by the gyroscope sensor 1009A. The gyroscope sensor 1009A can be used for anti-shake shooting. For example, when the shutter is pressed, the gyroscope sensor 1009A detects the angle of the electronic device 100 shaking, calculates the distance that the lens module needs to compensate according to the angle, and makes the lens offset the shaking of the electronic device 100 by reverse movement to achieve anti-shake. The gyroscope sensor 1009A can also be used for navigation and motion sensing game scenarios.

[0114] The acceleration sensor 1009B can detect the acceleration of the electronic device 100 in each direction (generally three axes). When the electronic device 100 is stationary, it can detect the size and direction of gravity. It can also be used to identify the posture of the electronic device, for example, the acceleration sensor 1009B can be applied to landscape / portrait screen switching, pedometer, etc.

[0115] Ambient light sensor 1009C is used to sense ambient light brightness. Electronic device 100 can adaptively adjust the brightness of display screen 1012 according to the sensed ambient light brightness. Ambient light sensor 1009C can also be used to automatically adjust white balance when taking photos.

[0116] Image sensor 1009D, also known as a photosensitive element, can convert the optical image on the photosensitive surface into an electrical signal in a corresponding proportional relationship with the optical image by using the photoelectric conversion function of the photoelectric device. The image sensor can be a charge coupled device (CCD) sensor or a complementary metal-oxide-semiconductor (CMOS) sensor.

[0117] Distance sensor 1009E can be used to measure distance. Electronic device 100 can measure distance by infrared or laser. In some shooting scenarios, electronic device 100 can use distance sensor 1009E to measure distance to achieve fast focusing.

[0118] Focus motor 1010 can be used for fast focusing. Electronic device 100 can control the movement of the lens by focus motor 1010 to achieve automatic focusing.

[0119] Electronic device 100 can achieve the shooting function through ISP, camera 1011, video codec, GPU, display screen 1012, and application processor, etc.

[0120] ISP is used to process the data fed back by camera 1011. For example, when taking a photo, the shutter is opened, the light passes through the lens and is transmitted to the camera photosensitive element, the optical signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to the ISP for processing and conversion into an image visible to the naked eye. ISP can also algorithmically optimize the noise and brightness of the image. ISP can also optimize parameters such as exposure and color temperature of the shooting scene. In some embodiments, ISP can be provided in camera 1011.

[0121] Camera 1011 can be used to capture still images or videos. Objects generate optical images through lenses and project them onto image sensors. Image sensors can convert optical signals into electrical signals, and then transmit the electrical signals to ISPs for conversion into digital image signals. The ISP can output the digital image signal to the DSP for processing. The DSP converts the digital image signal into image signals in standard RGB, YUV, etc. formats. In some embodiments, electronic device 100 can include one or N cameras 1011, where N is a positive integer greater than 1.

[0122] Video codecs are used to compress or decompress digital images. The electronic device 100 can support one or more image codecs. In this way, the electronic device 100 can capture or save pictures or videos in a variety of encoding formats.

[0123] The electronic device 100 can implement a display function through a GPU, a display screen 1012, and an application processor, etc. The GPU is a microprocessor for image processing, connected to the display screen 1012 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 1003 can include one or more GPUs that execute program instructions to generate or change display information.

[0124] The display screen 1012 is used to display images, videos, etc. The display screen 1012 includes a display panel. The display panel can adopt a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED), a flex light-emitting diode (FLED), a Miniled, a MicroLed, a Micro-oLed, a quantum dot light emitting diode (QLED), etc. In some embodiments, the electronic device 100 can include 1 or N display screens 1012, and N is a positive integer greater than 1.

[0125] It can be understood that the structure shown in the embodiments of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 can include more or fewer components than shown, or combine certain components, or split certain components, or different component arrangements. The components shown can be implemented in hardware, software, or a combination of software and hardware.

[0126] Other devices

[0127] The present application discloses a printed circuit board (PCB), which can include any improved voltage regulation circuit described above.

[0128] The chip system can include any of the improved voltage regulation circuits described above. The chip system can also include one or more processors configured to execute computer instructions to perform the voltage regulation methods provided herein. In some embodiments, the chip system can also include a power supply configured to provide a DC input voltage to the voltage regulation circuit, which is configured to reduce the DC input voltage provided by the power supply and output the reduced DC input voltage. In some embodiments, the chip system can also include a load, and the voltage regulation circuit is configured to reduce the received DC input voltage and output the reduced DC input voltage to the load.

[0129] The power supply system can include a power supply, any of the improved voltage regulation circuits described above, and a load. The power supply is configured to provide a DC input voltage to the voltage regulation circuit, which is configured to reduce the DC input voltage provided by the power supply and output the reduced DC input voltage to the load.

[0130] The power supply circuit can include a power supply and any of the improved voltage regulation circuits described above. The power supply is configured to provide a DC input voltage to the voltage regulation circuit, which is configured to reduce the DC input voltage provided by the power supply and output the reduced DC input voltage.

[0131] The power supply circuit can include any of the improved voltage regulation circuits described above and a load. The voltage regulation circuit is configured to reduce the received DC input voltage and output the reduced DC input voltage to the load.

[0132] The improved voltage regulation circuit described above can refer to Figure 3 The voltage regulation circuit includes a PMIC, which includes a voltage control unit and one or more VRMs. When a PG problem occurs in a VRM in the PMIC, the electronic device modifies the V LPM After the electronic device is restarted or powered on, the voltage control unit controls the VRM in the PMIC to follow the modified V LPM The NPM is switched to the LPM. In some embodiments, the voltage regulation circuit can also include a power supply. In some embodiments, the voltage regulation circuit can also include a load.

[0133] The electronic device can include any of the improved voltage regulation circuits described above.

[0134] The electronic device can include the power supply system provided above.

[0135] The electronic device can include any of the power supply circuits provided above.

[0136] The embodiments of the present application can be combined in any manner to achieve different technical effects.

[0137] In the above-described embodiments, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center through wired (such as coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

[0138] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0139] The terms "first", "second" are only for descriptive purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features, and in the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" is two or more than two.

[0140] In summary, the above only describes the embodiments of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made according to the disclosure of the present application shall be included in the protection scope of the present application.

Claims

1. A voltage regulation method, characterized by, The method is applied to an electronic device, and the electronic device comprises a voltage regulation circuit, and the voltage regulation circuit comprises a first VRM; The first VRM comprises a PWM controller, a driver, a first switch tube and a second switch tube, an inductor, a capacitor, and a comparator; the output end of the PWM controller is connected to the input end of the driver, and the PWM controller is configured to output a PWM voltage signal to the driver; for the first switch tube, the drain is connected to the high-voltage input end of the first VRM, the gate is connected to the first output end of the driver, and the source is connected to the first end of the inductor; for the second switch tube, the drain is connected to the first end of the inductor, the gate is connected to the second output end of the driver, and the source is grounded; the second end of the inductor and the first end of the capacitor are both connected to the high-voltage output end of the first VRM, and the second end of the capacitor is grounded; the first input end of the comparator is connected to the source of the second switch tube, the second input end of the comparator is configured to receive a preset voltage, and the output end of the comparator is connected to the gate of the first switch tube and the gate of the second switch tube; The method comprises: The electronic device detects that the voltage output by the first VRM is lower than a preset PG value; The electronic device modifies the voltage output by the first VRM in the low-power mode from a first value to a second value, and the second value is greater than the first value.

2. The method of claim 1, wherein, After the electronic device detects that the voltage output by the first VRM is lower than the preset PG value, the method further comprises: The electronic device restarts; Or, The electronic device shuts down and starts up after receiving a start-up operation.

3. The method of claim 2, wherein, Before the electronic device restarts or shuts down, the method further comprises: The electronic device displays first prompt information, and the first prompt information is used to prompt a user that the electronic device will be restarted or shut down due to PG.

4. The method according to claim 2 or 3, characterized in that, After the electronic device restarts or starts up, the method further comprises: The electronic device displays second prompt information, and the second prompt information is used to prompt a user that the electronic device is restarted or shut down due to PG.

5. The method according to any one of claims 2 to 4, characterized in that, During the process of restarting or starting up, the electronic device modifies the voltage output by the first VRM in the low-power mode from a first value to a second value.

6. The method according to any one of claims 1 to 5, characterized in that, The electronic device further comprises a register, and after the electronic device detects that the voltage output by the first VRM is lower than the preset PG value, the method further comprises: The electronic device sets the bit position corresponding to the first VRM in the register to 1.

7. The method of claim 6, wherein, Before the electronic device modifies the voltage output by the first VRM in the low-power mode from a first value to a second value, the method further comprises: The electronic device reads the value 1 from the bit position corresponding to the first VRM in the register.

8. The method of any one of claims 1-7, wherein: the second value = V LPM0 + N * step, V LPM0 N is the number of times the first VRM historical output voltage is lower than the PG value, and step is a preset value. Or, The second value = V LPM0 + N * step, V LPM0 V is a voltage value output by the first VRM in a low-power mode, and N and step are preset values. Or, The second value is equal to the voltage value output by the first VRM in the normal mode.

9. The method according to any one of claims 1 to 8, characterized in that, The electronic device detects that the voltage output by the first VRM is lower than the preset PG value after the following conditions occur: The electronic device controls the first switch tube to be off and the second switch tube to be on; the voltage output by the first VRM discharges current through the second switch tube; the voltage received by the first input end of the comparator is greater than the preset voltage of the second input end, and the output end of the comparator outputs a low level; and the second switch tube is closed.

10. The method according to any one of claims 1 to 9, characterized in that, After the electronic device modifies the voltage output by the first VRM in the low-power mode from the first value to the second value, the method further comprises: The electronic device controls the first VRM to enter a normal mode. The electronic device controls the first VRM to enter a low-power mode from the normal mode.

11. The method of claim 10, wherein, The voltage regulation circuit further comprises a voltage control unit, The electronic device controls the first VRM to enter a normal mode, specifically comprising: the electronic device controls the first switch tube and the second switch tube of the first VRM to be alternately turned on through the voltage control unit. The electronic device controls the first VRM to enter a low-power mode from the normal mode, specifically comprising: the electronic device controls the first switch tube to be off and the second switch tube to be on through the voltage control unit, and then controls the first switch tube and the second switch tube to be alternately turned on through the voltage control unit after the voltage output by the first VRM is reduced to the second value.

12. An electronic device, comprising: The electronic device comprises a voltage regulation circuit, and the voltage regulation circuit comprises a first VRM; The first VRM comprises a PWM controller, a driver, a first switch tube and a second switch tube, an inductor, a capacitor, and a comparator; the output end of the PWM controller is connected to the input end of the driver, and the PWM controller is configured to output a PWM voltage signal to the driver; for the first switch tube, the drain electrode is connected to the high-voltage input end of the first VRM, the gate electrode is connected to the first output end of the driver, and the source electrode is connected to the first end of the inductor; for the second switch tube, the drain electrode is connected to the first end of the inductor, the gate electrode is connected to the second output end of the driver, and the source electrode is grounded; the second end of the inductor and the first end of the capacitor are both connected to the high-voltage output end of the first VRM, and the second end of the capacitor is grounded; the first input end of the comparator is connected to the source electrode of the second switch tube, the second input end of the comparator is configured to receive a preset voltage, and the output end of the comparator is connected to the gate electrode of the first switch tube and the gate electrode of the second switch tube; The electronic device is configured to perform the method according to any one of claims 1-11.

13. The electronic device of claim 12, wherein, The electronic device further comprises a power supply, and the high-voltage input end of the first VRM is connected to the high-voltage output end of the power supply.

14. The electronic device of claim 12 or 13, wherein, The high-voltage input end of the first VRM is connected to the high-voltage output end of the power supply.

15. A chip system, characterized by The chip system comprises a voltage regulation circuit, and the voltage regulation circuit comprises a first VRM; The electronic device controls the first VRM to enter a normal mode, specifically comprising: the electronic device controls the first switch tube and the second switch tube of the first VRM to be alternately turned on through the voltage control unit; The electronic device controls the first VRM to enter a low-power mode from the normal mode, specifically comprising: the electronic device controls the first switch tube to be off and the second switch tube to be on through the voltage control unit, and then controls the first switch tube and the second switch tube to be alternately turned on through the voltage control unit after the voltage output by the first VRM is reduced to the second value. The electronic device comprises a voltage regulation circuit, and the voltage regulation circuit comprises a first VRM; The first VRM comprises a PWM controller, a driver, a first switch tube and a second switch tube, an inductor, a capacitor, and a comparator; the output end of the PWM controller is connected to the input end of the driver, and the PWM controller is configured to output a PWM voltage signal to the driver; for the first switch tube, the drain electrode is connected to the high-voltage input end of the first VRM, the gate electrode is connected to the first output end of the driver, and the source electrode is connected to the first end of the inductor; for the second switch tube, the drain electrode is connected to the first end of the inductor, the gate electrode is connected to the second output end of the driver, and the source electrode is grounded; the second end of the inductor and the first end of the capacitor are both connected to the high-voltage output end of the first VRM, and the second end of the capacitor is grounded; the first input end of the comparator is connected to the source electrode of the second switch tube, the second input end of the comparator is configured to receive a preset voltage, and the output end of the comparator is connected to the gate electrode of the first switch tube and the gate electrode of the second switch tube; The electronic device is configured to perform the method according to any one of claims 1-11. The electronic device further comprises a power supply, and the high-voltage input end of the first VRM is connected to the high-voltage output end of the power supply. The high-voltage input end of the first VRM is connected to the high-voltage output end of the power supply. The chip system comprises a voltage regulation circuit, and the voltage regulation circuit comprises a first VRM; The first VRM comprises a PWM controller, a driver, a first switch tube and a second switch tube, an inductor, a capacitor, and a comparator; an output terminal of the PWM controller is connected to an input terminal of the driver, and the PWM controller is configured to output a PWM voltage signal to the driver; for the first switch tube, a drain is connected to a high-voltage input terminal of the first VRM, a gate is connected to a first output terminal of the driver, and a source is connected to a first end of the inductor; for the second switch tube, a drain is connected to the first end of the inductor, a gate is connected to a second output terminal of the driver, and a source is grounded; a second end of the inductor and a first end of the capacitor are both connected to a high-voltage output terminal of the first VRM, and a second end of the capacitor is grounded; a first input terminal of the comparator is connected to a source of the second switch tube, a second input terminal of the comparator is configured to receive a preset voltage, and an output terminal of the comparator is connected to a gate of the first switch tube and a gate of the second switch tube. The chip system further comprises one or more processors configured to invoke computer instructions to cause execution of the method of any one of claims 1-11.

16. A readable storage medium comprising instructions, characterized in that, When the instructions are run on a device, the device is caused to perform the method of any one of claims 1-11.

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