Voltage regulation circuit, electronic equipment and voltage regulation method

Abstract

The invention discloses a voltage regulation circuit, an electronic device and a voltage regulation method, and aims to reduce the output voltage difference required to be reduced in the process of switching the VRM from NPM to LPM by increasing the value of the voltage VLPM output after the VRM enters the LPM, thereby reducing the current required to be discharged, preventing the overlarge discharge current from triggering a protection mechanism, and improving the reliability of the voltage regulation circuit. Therefore, shutdown or restart of the electronic equipment caused by PG of the VRM can be avoided.

Description

Technical Field

[0001] The present application relates to the field of electronic circuits, and in particular to a voltage regulation circuit, an electronic device, and a voltage regulation method. Background Art

[0002] The required voltage and current of some modules in electronic devices, such as central processor unit (CPU), graphics processing unit (GPU), application specific integrated circuit (ASIC), etc., are dynamically changing. For example, the CPU load voltage and current are very different when opening a document and opening a game. Therefore, the core voltage Vcore required by each of the above modules is different and may increase or decrease instantly, and the device power supply with a fixed output voltage cannot meet the voltage requirements of the above modules.

[0003] To this end, electronic devices are equipped with a power management integrated circuit (PMIC), which packages multiple output power supplies together and has a high degree of integration. The PMIC can integrate multiple voltage regulator modules (VRM) to convert the larger DC voltage (such as 12V) output by the power supply into a stable smaller DC voltage (such as 0.5V-2V), and can adjust the output voltage in real time according to the load requirements to meet the working voltage requirements of the above loads. Summary of the invention

[0004] The present application provides a voltage regulation circuit, an electronic device and a voltage regulation method, which can prevent the electronic device from shutting down or restarting due to the PG of the VRM.

[0005] In a first aspect, a voltage regulation method is provided, which is applied to an electronic device. The electronic device includes a voltage regulation circuit, and the voltage regulation circuit includes a first VRM; the first VRM includes: 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 used 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 used 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;

[0006] The method of the first aspect includes: 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 low power consumption mode from a first value to a second value, and the second value is greater than the first value.

[0007] Implement the method of the first aspect, by increasing the voltage V output by the VRM after entering the LPM LPM The value of VRM can reduce the output voltage difference that needs to be reduced when switching from NPM to LPM, thereby reducing the current that needs to be discharged. This can avoid excessive discharge current and triggering the protection mechanism, thereby preventing the electronic equipment from shutting down or restarting due to the PG of VRM.

[0008] In combination 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 then 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 embodiments, before the electronic device is restarted or shut down, the method may further include: the electronic device displays a first prompt message, where the first prompt message is used to prompt the user that the electronic device will be restarted or shut down due to PG reasons.

[0010] In some embodiments, after the electronic device is restarted or powered on, the method may further include: the electronic device displays a second prompt message, where the second prompt message is used to prompt the user that the electronic device is restarted or powered off due to PG reasons.

[0011] In some implementations, during a restart or startup process of the electronic device, the voltage output by the first VRM in a low power consumption mode is modified from a first value to a second value.

[0012] In combination with the first aspect, in some embodiments, the electronic device further includes a register, and 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: the electronic device sets the 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 consumption mode from a first value to a second value, the method may further include: the electronic device reads a value 1 from a bit 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 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 is the voltage value currently output by the first VRM in the low power consumption mode, 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.

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

[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 consumption mode from a first value to a second value, the method may further include: the electronic device controls the first VRM to enter a normal mode; the electronic device controls the first VRM to enter a low power consumption mode from a normal mode.

[0017] In some embodiments, the voltage regulation circuit also includes a voltage control unit, and the electronic device controls the first VRM to enter a normal mode, specifically including: 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 consumption mode from a normal mode, specifically including: the electronic device first controls the first switch tube to be turned off and the second switch tube to be turned on through the voltage control unit, and after the voltage output of the first VRM is reduced to the second value, controls the first switch tube and the second switch tube to be alternately turned on through the voltage control unit.

[0018] In a second aspect, an electronic device is provided, the electronic device comprising a voltage regulation circuit, the voltage regulation circuit comprising 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 used 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 used 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 electronic device is used to perform the method as in the first aspect or any implementation method of the first aspect.

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

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

[0021] In a third aspect, a chip system is provided, the chip system includes a voltage regulation circuit, the voltage regulation circuit includes a first VRM; the first VRM includes: 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 used 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 used 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 chip system also includes one or more processors, the processor is used to call computer instructions to execute the method as in the first aspect or any one of the implementation methods of the first aspect.

[0022] In a fourth aspect, a readable storage medium is provided, comprising instructions, characterized in that when the instructions are executed on a device, the device executes a method as in the first aspect or any one of the implementations of the first aspect.

[0023] According to a fifth aspect, a program product is provided. When the program product is run on a device, the device executes the method according to the first aspect or any one of the implementations of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] Figure 3 A structural diagram of a voltage regulation circuit including a protection mechanism provided in an embodiment of the present application;

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

[0028] Figure 5 A flow chart of a voltage regulation method provided in an embodiment of the present application;

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

[0030] The technical solutions in the embodiments of the present application will be described clearly and in detail below with reference to the accompanying drawings.

[0031] First, several concepts involved in this application are introduced.

[0032] VRM

[0033] VRM is integrated into PMIC and is used to convert the larger DC voltage (such as 12V) output by the power supply in the electronic device into a stable smaller DC voltage (such as 0.5V-2V), and output it to the CPU, GPU, ASIC and other modules to meet the operating voltage requirements of the above modules.

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

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

[0036] The first input terminal is also called the high-voltage input terminal, which is connected to the high-voltage output terminal of the device power supply and is used to receive the input voltage Vin; the second input terminal is also called the low-voltage input terminal, which is connected to the low-voltage output terminal of the device power supply. The first output terminal is also called the high-voltage output terminal, which is connected to an input terminal of the subsequent load and is used to output the core voltage Vcore required by the subsequent load; the second output terminal is also called the low-voltage output terminal, which is connected to the other input terminal of the subsequent load. The second input terminal and the second output terminal can both be connected to the ground terminal (GND). The input voltage Vin can be the output voltage of the device power supply, and the device power supply can be a battery. The subsequent load refers to modules such as CPU, GPU, ASIC, etc. that have special operating voltage requirements.

[0037] The PWM controller 101 is connected to the driver 102, and is used to output 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 the core voltage Vcore output by the single-phase VRM 10. The PWM controller 101 is used 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 the positive half cycle; when the PWM voltage signal is at a low level, the PWM voltage signal is in the negative half cycle.

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

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

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

[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, which is used to make the drive circuit 1012 output the first drive signal S1 to M1, M1 is turned on, M2 is turned off / off, and 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, which is used to make the drive circuit 1013 output the second drive signal S2 to M2, M1 is turned off / 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 decreases, C outputs the power supply voltage to the subsequent load. In this way, under the action of the PWM voltage signal, the driver 102 controls M1 and M2 to switch frequently to provide continuous and stable current and voltage to the subsequent load.

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

[0043] In order to meet the requirements of different loads and improve the output power, a multi-phase voltage regulator module (multi-phase VRM), also known as a multi-phase DC-DC Buck type step-down circuit, is introduced. The multi-phase VRM 20 may include a PWM controller and multiple single-phase circuits connected in parallel. Each single-phase circuit is connected to Figure 1 The structures of the single-phase circuits shown are the same, and the first output terminal of each single-phase circuit is connected to an input terminal of the subsequent load, so as to output 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 multi-channel. 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 multi-channel.

[0044] The PMIC may include one or more VRMs, and different VRMs may be connected to different loads to provide voltages to the different loads.

[0045] Dynamic voltage scaling (DVS)

[0046] Electronic devices, especially mobile electronic devices, require low power consumption. Therefore, 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 this, in DVS, VRM provides two working modes: normal power mode (NPM) and low power mode (LPM). The voltage provided by VRM to the load in NPM is greater than the voltage provided by VRM to the load in LPM.

[0047] refer to Figure 2 , Figure 2 The working principle of DVS is illustrated in FIG.

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

[0049] The PMIC 201 integrates one or more VRMs, and the VRM may be a single-phase VRM or a multi-phase VRM, and its specific structure may refer to the above-mentioned related description. The PMIC 201 also includes a voltage control unit 202 .

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

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

[0052] If the load 203 is in full speed, the voltage control unit 202 controls the VRM 2011 to enter NPM, and the VRM 2011 outputs a voltage V NPM Provided to load 203. In this case, VRM 2011 provides voltage to load 203 according to the working principle described above, that is, PWM controller 101 outputs a PWM voltage signal, M1 and M2 switch frequently, and provide continuous and stable voltage to the subsequent load. The voltage requirement V of load 203 at full speed NPM Can change dynamically.

[0053] If the load 203 is in an idle state, the voltage control unit 202 controls the VRM 2011 to enter the LPM mode, and the VRM 2011 outputs a voltage V LPM In this case, the PWM controller 101 of the VRM 2011 can first output a continuous low-level voltage signal to turn off M1 and turn on M2, so that the output voltage is V NPM Reduce to V LPM , then the PWM controller 101 can output a PWM voltage signal so that the output voltage is maintained at V LPM . Usually, V LPM 、V NPM are all preset values, and V LPM Less than V NPM .

[0054] When VRM 2011 switches from NPM to LPM, M1 is turned off and M2 is turned on, so the energy originally stored in the capacitor C of VRM, that is, V output by VRM 2011, is NPM The current is discharged through the loop formed by the high voltage output terminal of VRM 2011, the second terminal to the first terminal of L, the drain (D) of M2, the source (S) of M2, and the ground terminal, thereby V NPM Reduce to V LPM Specifically, the VRM includes a voltage feedback (FB) pin. 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. LPM After that, the voltage control unit 202 can control M1 and M2 to be turned on alternately, and control the voltage output by VRM 2011 to be kept at V LPM .

[0055] During the current discharge process, there is current in M2. If the current is too large, M2 will be damaged. In order to avoid damage to the M2 device during the current discharge process, a Figure 3 VRM 2011 shown.

[0056] Figure 3 The VRM 2011 shown provides a protection mechanism to prevent device damage. Figure 3 As shown, Figure 3 The voltage regulation circuit shown includes: PMIC 201, and its Figure 2 The PMIC 201 shown in the figure has a comparator CP added to the VRM 2011. The negative input terminal V- of the comparator CP is connected to the source (S) of M2, and the positive input terminal V+ is used to receive a fixed reference voltage V limitThe output terminal is connected to the gate (G) of M1 and the gate (G) of M2. The positive input terminal V+ of the comparator CP may be referred to as the second input terminal, and the negative input terminal V- may be referred to as the first input terminal.

[0057] There is an impedance (e.g., 1-1.5Ω) between the source (S) of M2 and the ground terminal. When the discharge current is too large, the voltage received by the negative input terminal V- of the comparator CP will be greater than the reference voltage V limit , CP outputs a low level, M2 is turned off, and thus M2 is prevented from being damaged. This protection mechanism is completed autonomously by hardware. During the process of VRM 2011 switching from NPM to LPM, the discharge current may be too large due to a sudden decrease in the voltage required by the load, thereby triggering the above protection mechanism.

[0058] After the protection mechanism is triggered, M2 is turned off. Since M1 has been turned off during the discharge process, it can be considered that both M1 and M2 are turned off after M2 is turned off. The voltage output by VRM 2011 will not increase due to the cutoff of M1. The energy originally stored in C will be discharged, but it cannot discharge current through the loop formed by the high-voltage output end of VRM 2011, the second end to the first end of L, the drain of M2 (D), the source of M2 (S), and the ground end. It can only discharge current through the load. When discharging current through the load, the voltage output by VRM 2011 will be V NPM Continue to decrease 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 believes that the current VRM 2011 cannot work safely and reliably, and will trigger a 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] Visible, including Figure 3 In the process of switching from NPM to LPM, the VRM 2011 may output a voltage lower than the PG value due to excessive discharge current, thereby causing the electronic device to shut down or restart. Not limited to this, other reasons may also cause the output voltage of the VRM 2011 to be lower than the PG value, thereby causing the electronic device to shut down or restart, such as insufficient output capacity when the VRM 2011 switches from NPM to LPM, resulting in shutdown or restart.

[0060] There are many reasons for the shutdown or restart of an electronic device, such as the user actively triggering the shutdown or restart, or the shutdown or restart due to battery overheating, etc. In order to clarify the reason for the shutdown or restart of the electronic device, the electronic device in this application sets a register to store information on whether each VRM in the PMIC is shut down or restarted due to the output voltage being lower than the PG value. For example, a 16-bit register can be set in the electronic device, and each bit corresponds to a VRM. If a VRM is shut down or restarted due to the output voltage being lower than the PG value, the VRM reports an interrupt to the register before the electronic device is shut down or restarted, and the register sets the bit position corresponding to the VRM to 1, indicating that the corresponding VRM is shut down or restarted due to PG. Afterwards, the electronic device is shut down or restarted. If the data in the register is not read after the restart, it will not be cleared, so the register after the restart can still reflect the reason for the restart.

[0061] refer to Figure 4 , Figure 4 The diagram exemplarily shows a user interface displayed when the electronic device is restarted due to the PG of the VRM.

[0062] like Figure 4 As shown, the user interface displayed by the electronic device before restarting includes a prompt message 401, and the prompt message 401 is used to prompt 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 can be the text "the device will restart because the power output voltage is lower than the normal value". In some embodiments, Figure 4 The prompt information 401 shown can also remind the user how long it will take to restart, and can also display a countdown for restarting, etc. Figure 4 After the user interface is shown, you can reboot.

[0063] In some implementations, before the electronic device restarts, it may first read the register for storing PG information. If the information stored in the register indicates that the restart is caused by the PG of the VRM, the electronic device may display Figure 4 The user interface shown.

[0064] In some embodiments, the electronic device may also read the register for storing PG information after restarting. If the information stored in the register indicates that the restart is caused by the PG of the VRM, the electronic device may also display a similar user interface to prompt the user that the electronic device was restarted due to the PG of the VRM.

[0065] In other implementations, when the electronic device is shut down due to the PG of the VRM, a similar user interface as described above may be displayed before the shutdown, or after the shutdown and restart to prompt the user.

[0066] The prompt information displayed by the electronic device before restarting or shutting down due to PG can be called the first prompt information (such as Figure 4 As shown in the prompt information 401), the prompt information displayed after restarting or shutting down can be called the second prompt information.

[0067] When an electronic device is shut down or restarted too many times, users will not be able to use the device normally, which seriously affects the user experience and increases the rate of cancellation.

[0068] Improved voltage regulation circuit and voltage regulation method

[0069] In order to solve the problem of shutdown or restart caused by PG when the VRM of an electronic device switches from NPM to LPM, the present application provides an improved voltage regulation circuit.

[0070] The structure of the improved voltage regulation circuit provided in the embodiment of the present application is Figure 3 The circuit shown is the same as the one shown in the figure. The difference is that the improved voltage regulation circuit modifies the voltage V output after the VRM enters the LPM through software adjustment. LPM Specifically, by increasing V LPM The value of can reduce the output voltage difference that needs to be reduced when the VRM switches from NPM to LPM, thereby reducing the current that needs to be discharged. This can avoid the discharge current being too large and triggering the protection mechanism, thereby avoiding the shutdown or restart of the electronic equipment due to the PG of the VRM.

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

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

[0073] When the PMIC 201 of the electronic device supplies power to the subsequent load, the voltage output by the first VRM contained therein may be lower than the PG value. The reason why the output voltage is lower than the PG value can be referred to the above description. The first VRM can be any VRM in the PMIC 201, for example, Figure 3 VRM 2011 in.

[0074] S102, the electronic device is restarted, or the electronic device is shut down and then turned on in response to a user's power-on operation after being shut down.

[0075] Restarting refers to the electronic device automatically shutting down and then restarting without user intervention. After the electronic device is shut down, the user needs to actively trigger it, such as long pressing the power button, to restart the electronic device.

[0076] Before or after restarting, before shutting down or after shutting down and restarting, the electronic device can output prompt information through the displayed user interface to prompt the user that a PG problem occurs.

[0077] S103, the electronic device turns the V LPM The first value is modified to a second value, where the second value is greater than the first value.

[0078] In the embodiment of the present application, the electronic device may execute S103 during a restart process or during a boot process, or may execute S103 immediately after a restart or after booting.

[0079] Electronic equipment modification will V LPM There can be many ways, as long as the second value after modification is greater than the first value before modification.

[0080] For example, the following modifications may be included:

[0081] 1. Step-by-step lifting V LPM For example, the second value = V LPM0 +N*step, where V LPM0 It can be the V corresponding to the first VRM preset when the electronic device leaves the factory LPM (For example, it can be 0.5V), N can be the number of times the first VRM has a PG problem in history, and step is a preset boost voltage (for example, it can be 0.05V). If the electronic device has a PG problem for the first time, the V LPM By V LPM0 Modified to V LPM0 +1*step; If the electronic device has a PG problem for the second time, the V LPM By V LPM0 Modified to V LPM0 +2*step, and so on. This means that every time a PG problem occurs, the electronic device will increase the V corresponding to the VRM. LPM The value of is increased by step. LPM , which can make V LPM Keep it at a low value to reduce the power consumption after the VRM enters LPM.

[0082] 2. Step-up V LPM For example, the second value = V LPM0 +N*step, where V LPM0 Can refer to the current V LPM N can be set to 10 or a larger value, which can greatly increase V when a PG problem occurs. LPM , to avoid PG problems from happening again in the future.

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

[0084] After executing S103, V LPM The value of V NPM and V LPM Therefore, when the first VRM switches from NPM to LPM, the current is discharged 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 of M2 (D), the source of M2 (S), and the ground terminal. Since the voltage difference of the discharge current is small, it is highly unlikely to trigger the protection mechanism, so the current can be continuously discharged through M2 to reduce V NPM Reduce to V LPM , there is no need to discharge current through the load, which can avoid the PG problem caused by the first VRM appearing again, thereby avoiding the shutdown or restart of the electronic equipment.

[0085] In some implementations, if the first VRM has a PG problem again, the Figure 5 As shown in the method, continue to raise V LPM , until the first VRM no longer has PG problems.

[0086] It can be seen that the voltage regulation method provided in the embodiment of the present application provides a solution for PG failure in PMIC, which can improve power supply stability, improve user experience, and reduce the failure rate.

[0087] Electronic devices

[0088] The electronic device disclosed in the embodiments of the present application may be a mobile phone, a tablet computer, a desktop computer, a desktop computer with a touch-sensitive surface or a touch panel, a laptop computer, a notebook computer, a smart screen, a wearable device (such as a smart watch, a smart bracelet, etc.), an augmented reality (AR) device, a virtual reality (VR) device, an artificial intelligence (AI) device, a car computer, a smart headset, a game console, an Internet of Things (IOT) device, or a smart home device, etc.

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

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

[0091] The power source 1001 may be a battery, which may be charged by wire or wirelessly, and may also supply power to various modules in the electronic device through the PMIC 1002 .

[0092] PMIC 1002 is the same as PMIC 201 mentioned above, and the relevant description can be referred to. PMIC 1002 is connected to power supply 1001 and processor 1003 and other load modules, and the VRM included therein is used to receive the power supply voltage output by power supply 1001 and power processor 1003 and other load modules. PMIC 1002 can also be used to monitor parameters such as battery capacity, battery cycle number, battery health status (leakage, impedance), etc. In some other embodiments, PMIC 1002 can also be set in 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 may include one or more processing units, for example, the processor 1003 may include an application processor (AP), a modem processor, a graphics processor (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 may be independent devices or integrated into one or more processors.

[0095] The processor 1003 is used to modify the V of a VRM in the PMIC 1002 when a PG problem occurs. LPM For specific modification methods, please refer to Figure 5 Related description of S103.

[0096] The memory 1004 can be used to store computer executable program codes, and the executable program codes can include instructions. The processor 1003 executes various functional applications and data processing of the electronic device 100 by running the instructions stored in the memory 1004. The memory 1004 may include a program storage area and a data storage area. In a specific implementation, the memory 1004 may include a high-speed random access memory, and may 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 on 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 set in the memory 1004 or the processor 1003.

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

[0099] In combination with the structure of the electronic device 100, the process of each module cooperating to execute the voltage regulation method may 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: PMIC 1002 reports an interrupt to register 1005, and 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. If the electronic device 100 is shut down, it needs to receive a power-on operation input by the user.

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

[0104] Step 5. The processor 1003 modifies the V stored in the voltage control unit 1000. 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 supply power according to 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, showing a preset V LPM The voltage control unit 1000 controls the PWM controller in the first VRM to output a low-level voltage signal first, so that M1 is turned off and M2 is turned on, so that the output voltage is V NPM Reduce to V LPM , and then control the PWM controller to output a PWM voltage signal so that the output voltage is maintained at V LPM .

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

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

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

[0110] The mobile communication module 1007 can provide solutions for wireless communications including 2G / 3G / 4G / 5G, etc., applied to the electronic device 100. The mobile communication module 1007 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The mobile communication module 1007 can receive electromagnetic waves through the antenna 1007A, and filter, amplify, etc. the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 1007 can also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1007A.

[0111] The modem processor may include a modulator and a demodulator. The modulator is used to modulate the low-frequency baseband signal to be sent into a medium-high frequency signal. The demodulator is used to demodulate the 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. After the low-frequency baseband signal is processed by the baseband processor, it is passed 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 wireless communication solutions including wireless local area networks (WLAN), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR), etc., which are applied to the electronic device 100. The wireless communication module 1006 can be one or more devices integrating at least one communication processing module. The wireless communication module 1006 receives electromagnetic waves via the antenna 1006A, modulates the frequency of the electromagnetic wave signal and performs filtering, and sends the processed signal to the processor 1003. The wireless communication module 1006 can also receive the signal to be sent from the processor 1003, modulate the frequency of the signal, amplify it, and convert it into electromagnetic waves for radiation through 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 based on the angle, and allows the lens to offset the shaking of the electronic device 100 through reverse movement to achieve anti-shake. The gyroscope sensor 1009A can also be used for navigation and somatosensory game scenes.

[0114] The acceleration sensor 1009B can detect the magnitude of the acceleration of the electronic device 100 in various directions (generally three axes). When the electronic device 100 is stationary, the magnitude and direction of gravity can be detected. It can also be used to identify the posture of the electronic device. For example, the acceleration sensor 1009B can be applied to applications such as horizontal and vertical screen switching, pedometers, etc.

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

[0116] Image sensor 1009D, also known as a photosensitive element, can utilize the photoelectric conversion function of a photoelectric device to convert the light image on the photosensitive surface into an electrical signal that is proportional to the light image. The image sensor can be a charge coupled device (CCD) sensor or a complementary metal-oxide-semiconductor (CMOS) sensor.

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

[0118] The focus motor 1010 can be used for fast focusing. The electronic device 100 can control the movement of the lens through the focus motor 1010 to achieve automatic focusing.

[0119] The electronic device 100 can realize the shooting function through an ISP, a camera 1011, a video codec, a GPU, a display screen 1012, and an application processor.

[0120] The ISP is used to process the data fed back by the camera 1011. For example, when taking a photo, the shutter is opened, and the light is transmitted to the camera photosensitive element through the lens. The light signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to the ISP for processing and converts it into an image visible to the naked eye. The ISP can also perform algorithm optimization on the noise and brightness of the image. The ISP can also optimize the exposure, color temperature and other parameters of the shooting scene. In some embodiments, the ISP can be set in the camera 1011.

[0121] The camera 1011 can be used to capture still images or videos. The object generates an optical image through the lens and projects it onto the image sensor. The image sensor can convert the optical signal into an electrical signal, and then transmit the electrical signal to the ISP to convert it into a digital image signal. The ISP can output the digital image signal to the DSP for processing. The DSP converts the digital image signal into an image signal in a standard RGB, YUV or other format. In some embodiments, the electronic device 100 may include 1 or N cameras 1011, where N is a positive integer greater than 1.

[0122] The video codec is used to compress or decompress digital images. The electronic device 100 may support one or more video codecs. In this way, the electronic device 100 can open or save pictures or videos in multiple coding formats.

[0123] The electronic device 100 can realize the display function through a GPU, a display screen 1012, and an application processor. The GPU is a microprocessor for image processing, which connects the display screen 1012 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 1003 may include one or more GPUs, which 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 be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), Miniled, MicroLed, Micro-oLed, a quantum dot light-emitting diode (QLED), etc. In some embodiments, the electronic device 100 may include 1 or N display screens 1012, where N is a positive integer greater than 1.

[0125] It is to be understood that the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 may include more or fewer components than shown in the figure, or combine some components, or separate some components, or arrange the components differently. The components shown in the figure may 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 may include any one of the improved voltage regulating circuits described above.

[0128] The present application discloses a chip system, which may include any of the improved voltage regulation circuits described above. The chip system also includes one or more processors, which are used to call computer instructions to execute the voltage regulation method provided in the present application. In some embodiments, the chip system may also include a power supply, which is used to provide a DC input voltage to the voltage regulation circuit, and the voltage regulation circuit is used to reduce the DC input voltage provided by the power supply and output it. In some embodiments, the chip system may also include a load, and the voltage regulation circuit is used to reduce the received DC input voltage and output it to the load.

[0129] The present application discloses a power supply system, which may include: a power supply, any of the improved voltage regulating circuits described above, and a load. The power supply is used to provide a DC input voltage to the voltage regulating circuit, and the voltage regulating circuit is used to reduce the DC input voltage provided by the power supply and output it to the load.

[0130] The present application discloses a power supply circuit, which may include: a power supply, and any improved voltage regulating circuit described above. The power supply is used to provide a DC input voltage to the voltage regulating circuit, and the voltage regulating circuit is used to reduce the DC input voltage provided by the power supply and then output it.

[0131] The present application discloses a power supply circuit, which may include: any one of the improved voltage regulating circuits described above, and a load. The voltage regulating circuit is used to reduce the received DC input voltage and output it to the load.

[0132] The improved voltage regulation circuit can be referred to Figure 3 The voltage regulation circuit includes a PMIC, which includes a voltage control unit and one or more VRMs. When a VRM in the PMIC has a PG problem, the electronic device will modify the V stored in the voltage control unit. LPM After the electronic device is restarted or powered on, the voltage control unit controls the VRM in the PMIC to adjust the voltage according to the modified V LPM Switching from NPM to LPM. In some embodiments, the voltage regulation circuit may further include a power supply. In some embodiments, the voltage regulation circuit may further include a load.

[0133] The present application discloses an electronic device, which may include any one of the improved voltage regulating circuits described above.

[0134] The present application discloses an electronic device, which may include the power supply system provided above.

[0135] The present application discloses an electronic device, which may include any one of the power supply circuits provided above.

[0136] The various implementation modes of the present application can be combined arbitrarily to achieve different technical effects.

[0137] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. 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 a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., 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; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0139] The terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0140] In short, the above is only an embodiment of the technical solution of this application, and is not intended to limit the protection scope of this application. Any modification, equivalent replacement, improvement, etc. made according to the disclosure of this application shall be included in the protection scope of this application.

Claims

1. A voltage regulation method, characterized in that: The method is applied to an electronic device, the electronic device comprises a voltage regulating circuit, the voltage regulating circuit comprises a first VRM; The first VRM includes: 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 used 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 used 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 consumption mode from a first value to a second value, where the second value is greater than the first value.

2. The method according to claim 1, characterized in that After the electronic device detects that the voltage output by the first VRM is lower than a preset PG value, the method further includes: The electronic device is restarted; or, The electronic device is powered off and powered on after receiving a power-on operation.

3. The method according to claim 2, characterized in that Before the electronic device is restarted or shut down, the method further includes: The electronic device displays a first prompt message, where the first prompt message is used to prompt the user that the electronic device will be restarted or shut down due to a PG reason.

4. The method according to claim 2 or 3, characterized in that: After the electronic device is restarted or powered on, the method further includes: The electronic device displays a second prompt message, where the second prompt message is used to prompt the user that the electronic device is restarted or shut down due to a PG reason.

5. The method according to any one of claims 2 to 4, characterized in that: During the restart or startup process of the electronic device, the voltage output by the first VRM in the low power consumption mode is modified from the first value to the second value.

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

7. The method according to claim 6, characterized in that Before the electronic device modifies the voltage output by the first VRM in the low power consumption mode from the first value to the second value, the method further includes: The electronic device reads a value of 1 from the bit corresponding to the first VRM in the register.

8. The method according to any one of claims 1 to 7, characterized in that: The second value = V LPM0 +N*step,V LPM0 is a preset value, N is the number of times the historical output voltage of the first VRM is lower than the PG value, and step is a preset value; or, The second value = V LPM0 +N*step,V LPM0 is the voltage value currently output by the first VRM in low power consumption 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.

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

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 consumption mode from the first value to the second value, the method further includes: The electronic device controls the first VRM to enter a normal mode; The electronic device controls the first VRM to enter a low power consumption mode from a normal mode.

11. The method according to claim 10, characterized in that The voltage regulation circuit further includes 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 consumption mode from a normal mode, specifically comprising: the electronic device first controls the first switch tube to be turned off and the second switch tube to be turned on through the voltage control unit, and after the voltage output by the first VRM decreases to the second value, controls the first switch tube and the second switch tube to be turned on alternately through the voltage control unit.

12. An electronic device, characterized in that: The electronic device includes a voltage regulation circuit, the voltage regulation circuit includes a first VRM; The first VRM includes: 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 used 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 used 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 electronic device is used to execute the method according to any one of claims 1-11.

13. The electronic device according to claim 12, characterized in that: The electronic device further includes a power supply, and a high-voltage input terminal of the first VRM is connected to a high-voltage output terminal of the power supply.

14. The electronic device according to claim 12 or 13, characterized in that: The high voltage input terminal of the first VRM is connected to the high voltage output terminal of the power supply.

15. A chip system, characterized in that: The chip system includes a voltage regulation circuit, and the voltage regulation circuit includes a first VRM; The first VRM includes: 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 used 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 used 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 chip system also includes one or more processors, which are used to call computer instructions to execute the method described in any one of claims 1-11.

16. A readable storage medium, comprising instructions, characterized in that: When the instructions are executed on a device, the device executes the method according to any one of claims 1 to 11.

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