CN115086562B

CN115086562B - Power supply circuit, power supply control method and electronic equipment

Info

Publication number: CN115086562B
Application number: CN202210873848.XA
Authority: CN
Inventors: 黄停
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2023-01-17
Anticipated expiration: 2042-07-25
Also published as: CN115086562A

Abstract

The embodiment of the application provides a power supply circuit, a power supply control method and electronic equipment, and is applied to the technical field of electronics. The TOF camera and the target load in the power supply circuit are both connected with a power supply management module, when the TOF camera is started, a voltage conversion unit converts input voltage into first power supply voltage to supply power to the TOF camera, a first voltage stabilization unit performs voltage stabilization processing on the first power supply voltage, and obtained third power supply voltage supplies power to the target load; when the TOF camera is turned off, the voltage conversion unit converts the input voltage into a second power supply voltage, the first voltage stabilization unit performs voltage stabilization on the second power supply voltage, and the obtained third power supply voltage supplies power to the target load. The voltage conversion unit which originally supplies power to the target load in the power management module is adopted to supply power to the TOF camera, and then a buck-boost chip which independently supplies power to the TOF camera can be removed, so that the occupied area of the device is reduced, and the cost is reduced.

Description

Power supply circuit, power supply control method and electronic equipment

Technical Field

The present disclosure relates to the field of electronic technologies, and in particular, to a power supply circuit, a power supply control method, and an electronic device.

Background

With the continuous development of electronic devices such as mobile phones and tablet computers, the requirements of users on the shooting performance of cameras are higher and higher, and therefore, time of flight (TOF) cameras can be arranged in some electronic devices to achieve 3D depth shooting.

In the related art, a separately provided buck-boost (buck-boost) chip may be used to supply power to the TOF camera, so that the TOF camera may work normally. However, the separately provided buck-boost chip needs to occupy an additional area of the main board, and may cause an increase in cost of the electronic apparatus.

Disclosure of Invention

The embodiment of the application provides a power supply circuit, a power supply control method and electronic equipment, wherein a voltage conversion unit which originally supplies power to a target load in a power management module of the electronic equipment is adopted to supply power to a TOF camera so as to remove a buck-boost chip which independently supplies power to the TOF camera in the electronic equipment, and therefore the occupied area of devices on a mainboard is reduced, and the cost of the electronic equipment is reduced.

In a first aspect, an embodiment of the present application provides a power supply circuit, which includes a power management module, a TOF camera, and a target load, where the power management module includes a voltage conversion unit and a first voltage stabilization unit; the input end of the voltage conversion unit is connected with the power supply, the output end of the voltage conversion unit is respectively connected with the TOF camera and the input end of the first voltage stabilization unit, and the output end of the first voltage stabilization unit is connected with the target load; the voltage conversion unit is used for converting the input voltage provided by the power supply into a first power supply voltage when the TOF camera is started and converting the input voltage provided by the power supply into a second power supply voltage when the TOF camera is closed; the first voltage stabilizing unit is used for performing voltage stabilizing processing on the first power supply voltage or the second power supply voltage to obtain a third power supply voltage; the first power supply voltage is used for supplying power to the TOF camera, and the third power supply voltage is used for supplying power to the target load.

Like this, adopt the voltage conversion unit of the power supply to the target load power supply originally among the power management module that electronic equipment includes to supply power to the TOF camera, under the circumstances that target load can normally work, can get rid of in the electronic equipment and carry out the buck-boost chip of power supply to the TOF camera alone to reduce the device area occupied on the mainboard and reduce electronic equipment's cost.

In one possible implementation, the first supply voltage is greater than the second supply voltage, and the second supply voltage is greater than the third supply voltage. The first supply voltage may be 4.2V, the second supply voltage may be 2.7V, and the third supply voltage may be 2.5V. Therefore, when the first power supply voltage is larger than the second power supply voltage and the second power supply voltage is larger than the third power supply voltage, the power consumption of the first voltage stabilizing unit in the closing state of the TOF camera is smaller than that of the first voltage stabilizing unit in the opening state of the TOF camera, so that the power consumption caused by the work of the first voltage stabilizing unit in the closing state of the TOF camera is reduced, and the whole power consumption of the electronic equipment is reduced.

In a possible implementation manner, the power supply circuit further comprises a processor, the power management module further comprises a control unit, the processor is connected with the control unit, and the control unit is further connected with the voltage conversion unit; the processor is used for sending a first control signal to the control unit when the TOF camera is started, and sending a second control signal to the control unit when the TOF camera is closed; and the control unit is used for controlling the voltage conversion unit to convert the input voltage provided by the power supply into a first power supply voltage according to the first control signal, and controlling the voltage conversion unit to convert the input voltage provided by the power supply into a second power supply voltage according to the second control signal. In this way, the processor sends the first control signal to the control unit, so that the control unit can control the voltage conversion unit to convert the input voltage into the first power supply voltage, and the TOF camera and the target load can work normally; and the processor sends a second control signal to the control unit, so that the control unit can control the voltage conversion unit to convert the input voltage into a second power supply voltage, and the target load can work normally.

In one possible implementation, the processor and the control unit are connected by an SPMI bus.

In one possible implementation manner, the voltage conversion unit includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and an inductor; the control end of the first switching tube is connected with the control unit, the first end of the first switching tube is connected with the power supply, and the second end of the first switching tube is connected with the first end of the inductor; the control end of the second switching tube is connected with the control unit, the first end of the second switching tube is connected with the second end of the first switching tube, and the second end of the second switching tube is connected with the grounding end; the control end of the third switching tube is connected with the control unit, the first end of the third switching tube is respectively connected with the input ends of the TOF camera and the first voltage stabilizing unit, and the second end of the third switching tube is connected with the second end of the inductor; the control end of the fourth switch tube is connected with the control unit, the first end of the fourth switch tube is connected with the second end of the third switch tube, and the second end of the fourth switch tube is connected with the grounding end. Therefore, the voltage conversion unit consisting of the first switching tube, the second switching tube, the third switching tube, the fourth switching tube and the inductor can support a boosting mode and a voltage reduction mode, and can output the first power supply voltage or the second power supply voltage as required under the condition that the input voltage provided by the power supply fluctuates; in addition, the voltage boosting mode and the voltage reducing mode are realized by the same voltage conversion unit, and can be realized by only one inductor, so that the component composition of the voltage conversion unit is simplified.

In one possible implementation manner, the first voltage stabilizing unit comprises a voltage adjusting tube, an error amplifier, a first resistor, a second resistor and a reference power supply; the control end of the voltage adjusting tube is connected with the output end of the error amplifier, the first end of the voltage adjusting tube is connected with the output end of the voltage conversion unit, and the second end of the voltage adjusting tube is connected with the target load; the first end of the first resistor is connected with the second end of the voltage adjusting tube, and the second end of the first resistor is connected with the non-inverting input end of the error amplifier; the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with the grounding end; the reference power supply is connected with the inverting input terminal of the error amplifier. Therefore, the first voltage stabilizing unit is formed based on the voltage adjusting tube, the error amplifier, the first resistor, the second resistor and the reference power supply, so that the first voltage stabilizing unit can adjust the first power supply voltage or the second power supply voltage to the third power supply voltage, and the target load can work normally when the TOF camera is turned on or turned off.

In a possible implementation manner, the power management module further includes a filtering unit, a first end of the filtering unit is connected to the power supply, and a second end of the filtering unit is connected to the ground terminal; the filtering unit is used for filtering the input voltage provided by the power supply; the filter unit comprises a first capacitor, a first end of the first capacitor is connected with the power supply, and a second end of the first capacitor is connected with the grounding end. In this way, the filtering unit is used for filtering the input voltage provided by the power supply to reduce the voltage jitter of the input voltage.

In a possible implementation manner, the power management module further includes a second voltage stabilizing unit, a first end of the second voltage stabilizing unit is connected to the output end of the voltage conversion unit and the TOF camera, and a second end of the second voltage stabilizing unit is connected to the ground end; the second voltage stabilizing unit is used for stabilizing the first power supply voltage output to the TOF camera by the voltage conversion unit; the second voltage stabilizing unit comprises a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor; the first ends of the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are connected with the output end of the voltage conversion unit and the TOF camera, and the second ends of the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are connected with the grounding end. In this way, the voltage stabilizing processing is performed on the first power supply voltage output to the TOF camera by the voltage conversion unit 1411 through the second voltage stabilizing unit, so that the first power supply voltage output to the TOF camera is more stable.

In a possible implementation manner, the power management module further includes a third voltage stabilization unit, a first end of the third voltage stabilization unit is connected to the output end of the first voltage stabilization unit and the target load, and a second end of the third voltage stabilization unit is connected to the ground end; the third voltage stabilizing unit is used for performing voltage stabilizing treatment on the third power supply voltage output by the first voltage stabilizing unit; the third voltage stabilizing unit comprises a sixth capacitor, the first end of the sixth capacitor is connected with the output end of the first voltage stabilizing unit and the target load, and the second end of the sixth capacitor is connected with the ground end. Therefore, the third voltage stabilizing unit is used for stabilizing the third power supply voltage output by the first voltage stabilizing unit, so that the third power supply voltage output to the target load is more stable.

In one possible implementation, the target load is an internal memory. Therefore, the voltage conversion unit which originally supplies power to the internal memory in the power management module only supplies power to the internal memory, so that the voltage conversion unit which originally supplies power to the internal memory in the power management module supplies power to the TOF camera, the circuit is improved more simply, and the requirement on the power supply capacity of the input current provided by the power supply is lower.

In a second aspect, an embodiment of the present application provides an electronic device, which includes a power supply and the power supply circuit described above; the power supply is a battery in the electronic device.

In a third aspect, an embodiment of the present application provides a power supply control method, which is applied to the power supply circuit described above, and the power supply control method includes: when the TOF camera is started, the voltage conversion unit converts input voltage provided by the power supply into first power supply voltage; the first voltage stabilizing unit is used for stabilizing the first power supply voltage to obtain a third power supply voltage; when the TOF camera is turned off, the voltage conversion unit converts the input voltage provided by the power supply into a second power supply voltage; the first voltage stabilizing unit is used for stabilizing the second power supply voltage to obtain a third power supply voltage; the first power supply voltage is used for supplying power to the TOF camera, and the third power supply voltage is used for supplying power to the target load.

In one possible implementation manner, when the TOF camera is turned on, the voltage conversion unit converts an input voltage provided by the power supply into a first power supply voltage, and includes: when the TOF camera is started, the processor sends a first control signal to the control unit; the control unit controls the voltage conversion unit to convert the input voltage provided by the power supply into a first power supply voltage according to the first control signal; when the TOF camera is closed, the input voltage that voltage conversion unit provided power supply converts the second supply voltage into, includes: when the TOF camera is closed, the processor sends a second control signal to the control unit; the control unit controls the voltage conversion unit to convert the input voltage provided by the power supply into a second power supply voltage according to the second control signal.

The effects of the possible implementations of the second aspect and the third aspect are similar to the effects of the possible designs of the first aspect and the first aspect, and are not described herein again.

Drawings

FIG. 1 is a schematic diagram of a buck-boost chip provided in the related art for powering a TOF camera;

fig. 2 is a schematic structural diagram of a hardware system of an electronic device according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 4 is a circuit diagram of a voltage converting unit according to an embodiment of the present application;

fig. 5 is a circuit diagram of a first voltage regulation unit according to an embodiment of the present application;

fig. 6 is a specific circuit diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 7 is a specific circuit diagram of another power supply circuit provided in an embodiment of the present application;

fig. 8 is a flowchart of a power supply control method according to an embodiment of the present application.

Detailed Description

In the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same or similar items having substantially the same function and action. For example, the first chip and the second chip are only used for distinguishing different chips, and the sequence order thereof is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

Along with the continuous development of electronic equipment such as cell-phone, panel computer, the user also is higher and higher to the requirement of the shooting performance of camera, consequently, among some electronic equipment, can be provided with time of flight TOF camera, realize 3D degree of depth based on TOF camera and make a video recording.

Among other things, TOF cameras may include a Transmitter (TX) to transmit infrared light or laser light pulses and a Receiver (RX) to receive reflected light and image.

During shooting, the TOF camera can emit infrared light outwards through the emitter, the infrared light can be reflected after encountering an object, and the reflected light can be received by the receiver. By utilizing the time difference or the phase difference between the infrared light emitted from the object and the infrared light reflected back to the TOF camera, the depth data reflecting the distance between the object and the TOF camera can be calculated, and the image containing the depth data generated by the TOF camera is the depth image acquired by the TOF camera.

Because the TOF camera needs larger working current when working, the working current can generally reach more than 2A, for example, the working current of the TOF camera is 2.8A; also, TOF cameras are very sensitive to voltage sags. However, during the use of the electronic device, the input voltage provided by the battery is generally between 3.4V and 4.4V, and the input voltage has a large fluctuation, for example, when the electronic device operates under a low power condition with high power, the input voltage provided by the battery may have a serious drop, thereby affecting the normal operation of the TOF camera.

Therefore, in order to enable the TOF camera to work normally, a buck-boost chip is separately arranged in the electronic device, and is connected between the battery and the TOF camera, so that the input voltage provided by the battery is boosted or reduced based on the buck-boost chip, and a stable first power supply voltage is provided for the TOF camera, for example, the first power supply voltage can be 4.2V, so as to prevent the input voltage provided by the battery from dropping to affect the TOF camera.

As shown in fig. 1, in the related art, the buck-boost chip includes a plurality of pins, which are a first input pin VIN1, a second input pin VIN2, an enable pin EN, a Serial Clock (SCL) pin, a Serial Data (SDA) pin, a VSEL pin, a first inductor input pin LX1_1, a second inductor input pin LX1_2, a first inductor output pin LX2_1, a second inductor output pin LX2_2, a first voltage output pin VOUT1, a second voltage output pin VOUT2, a ground pin, and the like. The ground pins may include a Protection Ground (PGND) pin, such as a first protection ground pin PGND1 and a second protection ground pin PGND2, and may further include an Analog Ground (AGND) pin.

The first input pin VIN1 and the second input pin VIN2 are used for connecting with a power supply, the power supply may be a battery, and the power supply may provide an input voltage VPH _ PWR to the first input pin VIN1 and the second input pin VIN 2. In addition, the first input pin VIN1 is further connected to first ends of the first filter capacitor C11 and the second filter capacitor C12, second ends of the first filter capacitor C11 and the second filter capacitor C12 are connected to the ground GND, and the input voltage VPH _ PWR provided by the power supply is filtered based on the first filter capacitor C11 and the second filter capacitor C12.

When the TOF camera needs to work, a high-level enabling signal GPIO _ EN can be input into an enabling pin EN, so that a buck-boost chip works to boost or buck the input voltage provided by the battery, and a stable first power supply voltage is provided for the TOF camera; when the TOF camera does not work, a low-level (such as 0V) enable signal GPIO _ EN can be input to the enable pin EN, and then the buck-boost chip does not boost or buck the input voltage provided by the battery any more, and does not provide a stable first power supply voltage to the TOF camera any more.

The I2C _ SCL pin of the processor may be connected to the SCL pin of the buck-boost chip, the I2C _ SDA pin of the processor may be connected to the SDA pin of the buck-boost chip, and based on the SCL pin and the SDA pin, data transmission between the processor and the buck-boost chip may be implemented to control the buck-boost chip to output a required first supply voltage (which may be 4.2V).

The first and second inductance input pins LX1_1 and LX1_2 may be connected to a first end of the inductor L10, and the first and second inductance output pins LX2_1 and LX2_2 may be connected to a second end of the inductor L10. The buck-boost chip may boost or buck the input voltage VPH _ PWR based on the inductor L10.

First voltage output pin VOUT1 and second voltage output pin VOUT2 are connected with the TOF camera, and buck-boost chip can be through first voltage output pin VOUT1 and second voltage output pin VOUT2 output stable first power supply voltage after stepping up or stepping down the input voltage VPH _ PWR that power supply provided to TOF camera. In addition, the first voltage output pin VOUT1 and the TOF camera are further connected with first ends of a first voltage-stabilizing capacitor C13, a second voltage-stabilizing capacitor C14, a third voltage-stabilizing capacitor C15 and a fourth voltage-stabilizing capacitor C16 respectively, second ends of the first voltage-stabilizing capacitor C13, the second voltage-stabilizing capacitor C14, the third voltage-stabilizing capacitor C15 and the fourth voltage-stabilizing capacitor C16 are connected with a ground terminal GND, and voltage stabilization of the first power supply voltage output by the buck-boost chip is realized based on the four voltage-stabilizing capacitors connected in parallel.

The VSEL pin, the first guard ground pin PGND1, the second guard ground pin PGND2, and the analog ground pin AGND are all connected to the ground GND.

Take the first supply voltage as 4.2V as an example. In actual use, when the input voltage VPH _ PWR provided by the power supply is greater than 4.2V, if the input voltage VPH _ PWR provided by the power supply is 4.4V, the buck-boost chip can operate in a buck mode, so that the buck-boost chip can reduce the input voltage VPH _ PWR to 4.2V to provide the TOF camera with the first supply voltage of 4.2V; when the input voltage VPH _ PWR provided by the power supply is less than 4.2V, if the input voltage VPH _ PWR provided by the power supply is 3.8v, the buck-boost chip may operate in a boost mode, so that the buck-boost chip may boost the input voltage VPH _ PWR to 4.2V to provide the first supply voltage of 4.2V to the TOF camera.

Therefore, when the input voltage VPH _ PWR provided by the power supply fluctuates, the stable first power supply voltage can be provided to the TOF camera based on the buck-boost chip shown in fig. 1, so that the TOF camera can work normally.

However, the electronic device is separately provided with the buck-boost chip to supply power to the TOF camera, and the buck-boost chip needs to be arranged on a main board of the electronic device, so that the buck-boost chip needs to additionally occupy the area of the main board; moreover, the addition of the buck-boost chip to the electronic device also increases the cost of the electronic device.

Currently, a power management module, which may also be referred to as a Power Management Integrated Circuit (PMIC), is also provided in the electronic device. The power management module comprises two voltage conversion units, wherein the voltage conversion units can also be called buck-boost circuits, and the two buck-boost circuits can be respectively called a first buck-boost circuit and a second buck-boost circuit.

The output end of the first buck-boost circuit is connected with the input end of the first voltage stabilizing circuit, and the output end of the first voltage stabilizing circuit is connected with electrical loads such as a fingerprint sensor, a Subscriber Identity Module (SIM) card and a display screen. The first voltage regulator circuit may be a low dropout regulator (LDO) circuit.

The output end of the second buck-boost circuit is connected with the input end of the second voltage stabilizing circuit, and the output end of the second voltage stabilizing circuit is connected with the internal memory. The internal memory may be a universal flash memory (UFS), and the second regulator circuit may be an LDO circuit.

The first buck-boost circuit is used for converting an input voltage provided by the power supply into a stable 3.6V supply voltage, that is, when the input voltage provided by the power supply drops, the first buck-boost circuit can output a 3.6V supply voltage, and when the input voltage provided by the power supply rises, the first buck-boost circuit can also output a 3.6V supply voltage. After the 3.6V power supply voltage is subjected to voltage stabilization processing by the first voltage stabilizing circuit, the 3.3V power supply voltage is provided for electric loads such as a fingerprint sensor, an SIM card and a display screen.

The second buck-boost circuit is used for converting the input voltage provided by the power supply into a stable 2.7V supply voltage, that is, the second buck-boost circuit can output the 2.7V supply voltage when the input voltage provided by the power supply drops, and can also output the 2.7V supply voltage when the input voltage provided by the power supply rises. After the 2.7V power supply voltage is subjected to voltage stabilization processing by the second voltage stabilizing circuit, the 2.5V power supply voltage is provided for the internal memory.

Based on this, the embodiment of the application provides a power supply circuit, a power supply control method and an electronic device, wherein a TOF camera is connected with a power supply management module of a target load, which is originally connected in the electronic device, when the TOF camera is turned on, a voltage conversion unit in the power supply management module converts an input voltage provided by a power supply into a first power supply voltage to supply power to the TOF camera, and a first voltage stabilization unit in the power supply management module performs voltage stabilization on the first power supply voltage to obtain a third power supply voltage so as to supply power to the target load; when the TOF camera is closed, the voltage conversion unit converts input voltage provided by the power supply into second power supply voltage, and the first voltage stabilization unit further performs voltage stabilization processing on the second power supply voltage to obtain third power supply voltage so as to supply power to a target load. Therefore, the voltage conversion unit which originally supplies power to the target load in the power management module included by the electronic equipment supplies power to the TOF camera, and the buck-boost chip which independently supplies power to the TOF camera in the electronic equipment can be removed under the condition that the target load can normally work, so that the occupied area of devices on a mainboard is reduced, and the cost of the electronic equipment is reduced.

In some embodiments, the voltage conversion unit in the power management module may refer to the second buck-boost circuit described above, and the target load refers to the internal memory described above. That is, the second buck-boost circuit that originally supplies power to the internal memory is used to supply power to the TOF camera.

Under the condition, when the TOF camera is started, the second buck-boost circuit converts the input voltage provided by the power supply into a first power supply voltage of 4.2V and supplies power to the TOF camera; and a first voltage stabilizing unit (at this time, the first voltage stabilizing unit can be a second voltage stabilizing unit) in the power management module performs voltage stabilizing processing on the 4.2V first power supply voltage to obtain a 2.5V third power supply voltage to supply power to the internal memory, so that both the TOF camera and the internal memory can work normally. When the TOF camera is closed, the second buck-boost circuit converts the input voltage provided by the power supply into a second power supply voltage of 2.7V, and the first voltage stabilizing unit performs voltage stabilization on the second power supply voltage of 2.7V to obtain a third power supply voltage of 2.5V so as to supply power to the internal memory and enable the internal memory to work normally; and, the second supply voltage that inputs to first voltage stabilizing unit at this moment is 2.7V, the third supply voltage that first voltage stabilizing unit output is 2.5V, the voltage difference between the voltage of first voltage stabilizing unit input and the voltage of output is 0.2V for the power consumption that first voltage stabilizing unit work brought under TOF camera closed condition reduces, because the use scene under TOF camera open mode is less in electronic equipment use, consequently, the power consumption that first voltage stabilizing unit during operation saved can be more under TOF camera closed condition, thereby electronic equipment's whole power consumption has been reduced.

In other embodiments, the voltage conversion unit in the power management module may refer to the first buck-boost circuit, and the target load refers to the electrical load of the fingerprint sensor, the SIM card, the display screen, and the like. That is to say, the first buck-boost circuit that originally supplies power to electric loads such as a fingerprint sensor, a SIM card, and a display screen is adopted to supply power to the TOF camera.

Under the condition, when the TOF camera is started, the first buck-boost circuit converts the input voltage provided by the power supply into a first power supply voltage of 4.2V and supplies power to the TOF camera; and, the first voltage stabilizing unit (the first voltage stabilizing unit at this moment can be first voltage stabilizing circuit) in the power management module carries out voltage stabilization to the first power supply voltage of 4.2V, obtains the third power supply voltage of 3.3V, supplies power to electric loads such as fingerprint sensor, SIM card, display screen for electric loads such as TOF camera and fingerprint sensor, SIM card, display screen all can normally work. And when the TOF camera is closed, the input voltage that first buck-boost circuit provided power supply converts 3.6V's second power supply voltage into, and first voltage stabilizing unit carries out voltage stabilization to 3.6V's second power supply voltage, obtains 3.3V's third power supply voltage, comes to supply power to power consumption loads such as fingerprint sensor, SIM card, display screen for power consumption loads such as fingerprint sensor, SIM card, display screen can normally work.

It should be noted that, because the number of originally connected devices of the first buck-boost circuit in the electronic device is large, and the first buck-boost circuit is connected with the electrical loads such as the fingerprint sensor, the SIM card, and the display screen, if the TOF camera is connected with the first buck-boost circuit, the power supply capability of the power supply current provided by the first buck-boost circuit may be insufficient, so that the normal operation of the electrical loads such as the TOF camera, the fingerprint sensor, the SIM card, and the display screen is affected. In addition, among the electrical loads for fingerprint sensors, SIM cards, display screens, etc., a part of the electrical loads may be connected to the first buck-boost circuit through the first voltage stabilizing circuit, and another part of the electrical loads may be directly connected to the first buck-boost circuit, so that if the TOF camera is connected to the first buck-boost circuit, when the TOF camera is turned on, the first buck-boost circuit outputs the first power supply voltage of 4.2V, and the first power supply voltage may exceed the working voltage of the part of the electrical loads directly connected to the first buck-boost circuit, thereby causing the part of the electrical loads to fail to work normally.

Therefore, if the first buck-boost circuit originally supplying power to the electric loads such as the fingerprint sensor, the SIM card, the display screen and the like in the power management module is used to supply power to the TOF camera, it is necessary to ensure that the input current provided by the power supply has a relatively large power supply capability; in addition, a corresponding first voltage stabilizing circuit is connected between the first buck-boost circuit and the electrical loads such as the fingerprint sensor, the SIM card, the display screen and the like.

In the embodiment of the present application, the second buck-boost circuit that originally supplies power to the internal memory is mainly used to supply power to the TOF camera, and the internal memory is used as a target load in the following embodiment.

The electronic device provided by the embodiment of the application can be a mobile phone, a tablet computer (Pad), a wearable device, an in-vehicle device, an Augmented Reality (AR) device, a Virtual Reality (VR) device, a notebook computer, a super-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA) and other electronic devices with a TOF camera. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the electronic device.

In order to better understand the embodiments of the present application, the following describes the structure of the electronic device according to the embodiments of the present application.

Fig. 2 is a schematic structural diagram of an electronic device 100 according to an embodiment of the present disclosure. The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, a first antenna, a second antenna, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display 194, a SIM card interface 195, and the like. Wherein the sensor module 180 may include a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, etc.

It is to be understood that the illustrated structure of the embodiment of the present application does not specifically limit the electronic device 100. In other embodiments of the present application, electronic device 100 may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Processor 110 may include one or more processing units, such as: the processor 110 may include a System On Chip (SOC), 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), among others. The different processing units may be separate devices or may be integrated into one or more processors.

The controller can generate an operation control signal according to the instruction operation code and the time sequence signal to finish the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to reuse the instruction or data, it may be called from memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a general-purpose input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, a Universal Serial Bus (USB) interface, and a System Power Management Interface (SPMI) interface, etc.

The processor 110 may be connected to the power management module 141 through the SPMI interface, and the processor 110 may send a corresponding control signal to the power management module 141 through the SPMI interface. For example, when the processor 110 determines that the TOF camera needs to be turned on, the processor 110 sends a first control signal to the power management module 141 through the SPMI interface, where the first control signal is used to instruct the power management module 141 to convert an input voltage provided by the power supply into a first power supply voltage so as to supply power to the TOF camera; and when the processor 110 determines that the TOF camera needs to be turned off, the processor 110 sends a second control signal to the power management module 141 through the SPMI interface, where the second control signal is used to instruct the power management module 141 to convert the input voltage provided by the power supply into a second power supply voltage.

The charging management module 140 is configured to receive a charging input from a charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 may receive charging input from a wired charger via the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive a wireless charging input through a wireless charging coil of the electronic device 100. The charging management module 140 may also supply power to the electronic device through the power management module 141 while charging the battery 142.

The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charging management module 140, and supplies power to the processor 110, the internal memory 121, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be used to monitor parameters such as battery capacity, battery cycle count, battery state of health (leakage, impedance), etc. In some other embodiments, the power management module 141 may also be disposed in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 may be disposed in the same device.

The wireless communication function of the electronic device 100 may be implemented by the first antenna, the second antenna, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.

The electronic device 100 implements display functions via the GPU, the display screen 194, and the application processor. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or alter display information. The display screen 194 is used for displaying images, displaying videos, receiving slide operations, and the like.

The electronic device 100 may implement a shooting function through the ISP, the camera 193, the video codec, the GPU, the display 194, the application processor, and the like.

The ISP is used to process the data fed back by the camera 193. For example, when a photo is taken, the shutter is opened, light is transmitted to the camera photosensitive element through the lens, the optical signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to the ISP for processing and converting into an image visible to naked eyes. The ISP can also carry out algorithm optimization on the noise, brightness and skin color of the image. The ISP can also optimize parameters such as exposure, color temperature and the like of a shooting scene. In some embodiments, the ISP may be provided in camera 193.

The camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects the optical image to the photosensitive element. The photosensitive element may be a Charge Coupled Device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The light sensing element converts the optical signal into an electrical signal, which is then passed to the ISP where it is converted into a digital image signal. And the ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into image signal in standard RGB, YUV and other formats. In some embodiments, electronic device 100 may include 1 or N cameras 193, N being a positive integer greater than 1.

In some embodiments, the camera 193 may include a TOF camera and other cameras, such as a wide-angle camera, a telephoto camera, etc., and the embodiments of the present application do not limit the specific form and number of the other cameras except for the TOF camera.

The number of the TOF cameras can be 1 or more; also, the TOF camera may be a front camera of the electronic apparatus 100, or may be a rear camera of the electronic apparatus 100. The number and the specific positions of the TOF cameras are not limited in the embodiment of the application.

The digital signal processor is used for processing digital signals, and can process digital image signals and other digital signals. For example, when the electronic device 100 selects a frequency bin, the digital signal processor is used to perform fourier transform or the like on the frequency bin energy.

Video codecs are used to compress or decompress digital video. The electronic device 100 may support one or more video codecs. In this way, the electronic device 100 may play or record video in a variety of encoding formats, such as: moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, and the like.

The NPU is a neural-network (NN) computing processor that processes input information quickly by using a biological neural network structure, for example, by using a transfer mode between neurons of a human brain, and can also learn by itself continuously. Applications such as intelligent recognition of the electronic device 100 can be realized through the NPU, for example: image recognition, face recognition, speech recognition, text understanding, and the like.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to extend the memory capability of the electronic device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music, video, etc. are saved in an external memory card.

The internal memory 121 may be used to store computer-executable program code, which includes instructions. The internal memory 121 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (such as audio data, phone book, etc.) created during use of the electronic device 100, and the like. In addition, the internal memory 121 may include a high speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, a general flash memory, and the like. The processor 110 executes various functional applications of the electronic device 100 and data processing by executing instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor.

The electronic device 100 may implement audio functions via the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the headphone interface 170D, and the application processor. Such as music playing, recording, etc.

The keys 190 include a power-on key, a volume key, and the like. The keys 190 may be mechanical keys. Or may be touch keys. The electronic apparatus 100 may receive a key input, and generate a key signal input related to user setting and function control of the electronic apparatus 100.

The motor 191 may generate a vibration cue. The motor 191 may be used for incoming call vibration cues, as well as for touch vibration feedback. Indicator 192 may be an indicator light that may be used to indicate a state of charge, a change in charge, or a message, missed call, notification, etc.

The SIM card interface 195 is used to connect a SIM card. The SIM card can be brought into and out of contact with the electronic apparatus 100 by being inserted into the SIM card interface 195 or being pulled out of the SIM card interface 195. The electronic device 100 may support 1 or N SIM card interfaces, N being a positive integer greater than 1.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following embodiments may be implemented independently or in combination, and details of the same or similar concepts or processes may not be repeated in some embodiments.

For example, fig. 3 is a schematic structural diagram of a power supply circuit provided in an embodiment of the present application. Referring to fig. 3, the power supply circuit includes a power management module 141, a TOF camera 310, and an internal memory 121, and the power management module 141 includes a voltage conversion unit 1411 and a first voltage stabilization unit 1412.

An input end of the voltage conversion unit 1411 is connected to the battery 142, an output end of the voltage conversion unit 1411 is connected to the TOF camera 310 and an input end of the first voltage stabilization unit 1412, and an output end of the first voltage stabilization unit 1412 is connected to the internal memory 121.

A voltage conversion unit 1411 configured to convert an input voltage provided by the battery 142 into a first power supply voltage when the TOF camera 310 is turned on; and converting the input voltage provided by the battery 142 to a second supply voltage when the TOF camera 310 is turned off. The first voltage stabilizing unit 1412 is configured to perform voltage stabilizing processing on the first power supply voltage or the second power supply voltage to obtain a third power supply voltage. The first power supply voltage is used for supplying power to the TOF camera 310, and the third power supply voltage is used for supplying power to the internal memory 121.

When the TOF camera 310 is turned on, an input voltage provided by the battery 142 is input to the voltage conversion unit 1411, the voltage conversion unit 1411 converts the input voltage into a first power supply voltage, and the first power supply voltage can supply power to the TOF camera 310, so that the TOF camera 310 can normally operate. The first power supply voltage converted by the voltage conversion unit 1411 is also input to the first voltage stabilization unit 1412, the first voltage stabilization unit 1412 performs voltage stabilization processing on the first power supply voltage to obtain a third power supply voltage, and the third power supply voltage can supply power to the internal memory 121, so that the internal memory 121 can normally operate.

When the TOF camera 310 is turned off, the input voltage provided by the battery 142 is input to the voltage conversion unit 1411, the voltage conversion unit 1411 converts the input voltage into a second power supply voltage, the second power supply voltage is not equal to the first power supply voltage, and the second power supply voltage does not enable the TOF camera 310 to normally work; moreover, the second power supply voltage converted by the voltage conversion unit 1411 is input to the first voltage stabilization unit 1412, the first voltage stabilization unit 1412 performs voltage stabilization processing on the second power supply voltage to obtain a third power supply voltage, and the third power supply voltage can supply power to the internal memory 121, so that the internal memory 121 can normally operate.

Therefore, in the embodiment of the present application, the power management module 141 originally connected to the internal memory 121 is connected to the TOF camera 310, so that the voltage conversion unit 1411 originally supplying power to the internal memory 121 in the power management module 141 is used to supply power to the TOF camera 310, and when the internal memory 121 can normally operate, a buck-boost chip independently supplying power to the TOF camera 310 in the electronic device 100 can be removed. Accordingly, there is no need to additionally provide a buck-boost chip for supplying power to the TOF camera 310 on the motherboard of the electronic device 100, so that the occupied area of devices on the motherboard is reduced, and the cost of the electronic device is reduced.

In some embodiments, the operating voltage of TOF camera 310 may be 4.2V, then the first supply voltage may be 4.2V, while the second supply voltage may be 2.7V and the third supply voltage may be 2.5V. Therefore, it can be known that the first power supply voltage is greater than the second power supply voltage, and the second power supply voltage is greater than the third power supply voltage.

When the TOF camera 310 is turned on, the first power supply voltage input to the first voltage stabilization unit 1412 is 4.2V, the third power supply voltage output by the first voltage stabilization unit 1412 is 2.5V, and a voltage difference between the voltage input by the first voltage stabilization unit 1412 and the voltage output by the first voltage stabilization unit 1412 is 1.7V, so that the TOF camera 310 is turned on and the power consumption caused by the operation of the first voltage stabilization unit 1412 is relatively large.

When the TOF camera 310 is turned off, the second power supply voltage input to the first voltage stabilizing unit 1412 is 2.7V, the third power supply voltage output by the first voltage stabilizing unit 1412 is 2.5V, and the voltage difference between the voltage input by the first voltage stabilizing unit 1412 and the voltage output by the first voltage stabilizing unit 1412 is 0.2V, so that the power consumption caused by the operation of the first voltage stabilizing unit 1412 in the turn-off state of the TOF camera 310 is relatively small.

Therefore, when the first power supply voltage is greater than the second power supply voltage and the second power supply voltage is greater than the third power supply voltage, the power consumption of the first voltage stabilization unit 1412 in the TOF camera 310 closed state is less than the power consumption of the first voltage stabilization unit 1412 in the TOF camera 310 open state, so that the power consumption caused by the operation of the first voltage stabilization unit 1412 in the TOF camera 310 closed state is reduced, and the overall power consumption of the electronic device 100 is reduced.

As shown in fig. 1, the power supply circuit further includes a processor 110, the power management module 141 further includes a control unit 1413, the processor 110 is connected to the control unit 1413, and the control unit 1413 is further connected to the voltage conversion unit 1411.

In some embodiments, the processor 110 may be an SOC processor and the control unit 1413 may be a Pulse Width Modulation (PWM) controller. The SPMI interface of the processor 110 and the SPMI interface of the control unit 1413 are connected through a SPMI bus.

A processor 110 for sending a first control signal to the control unit 1413 when the TOF camera 310 is turned on; and send a second control signal to the control unit 1413 when the TOF camera 310 is turned off. A control unit 1413 for controlling the voltage conversion unit 1411 to convert the input voltage provided from the battery 142 into a first power supply voltage according to a first control signal; and according to the second control signal, the control voltage conversion unit 1411 converts the input voltage provided by the battery 142 into a second supply voltage.

In one usage scenario, a user may perform a triggering operation at a user interface of the electronic device 100 to request that the TOF camera 310 be turned on, such that the processor 110 may determine that the TOF camera 310 needs to be turned on. When the processor 110 determines that the TOF camera 310 needs to be turned on, the processor 110 sends a first control signal to the control unit 1413, and after receiving the first control signal, the control unit 1413 may control the operating state of the voltage conversion unit 1411 according to the first control signal, so that the voltage conversion unit 1411 may convert the input voltage provided by the battery 142 into a first power supply voltage.

Correspondingly, when the user finishes using the TOF camera 310, the user may also perform a trigger operation on the user interface of the electronic device 100 to request to close the TOF camera 310, so that the processor 110 may determine that the TOF camera 310 needs to be closed. When the processor 110 determines that the TOF camera 310 needs to be turned off, the processor 110 sends a second control signal to the control unit 1413, and after receiving the second control signal, the control unit 1413 may control the operating state of the voltage conversion unit 1411 according to the second control signal, so that the voltage conversion unit 1411 converts the input voltage provided by the battery 142 into a second power supply voltage.

The above description has been given by taking the battery 142 as the power supply, and it is understood that the power supply may include, but is not limited to, the battery 142. The power supply may also be a wired charger connected to the USB interface 130, and the charging management module 140 may receive a charging input of the wired charger through the USB interface 130 and provide a corresponding input voltage to the power management module 141; alternatively, the power supply may also be a wireless charger, and the charging management module 140 may receive a wireless charging input of the wireless charger through a wireless charging coil of the electronic device 100 and provide a corresponding input voltage to the power management module 141.

In some embodiments, as shown in fig. 4, the voltage conversion unit 1411 includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, and an inductor L1.

The control terminal of the first switching tube Q1 is connected to the control unit 1413, the first terminal of the first switching tube Q1 is connected to the battery 142, that is, the first terminal of the first switching tube Q1 refers to the input terminal of the voltage conversion unit 1411, VPH _ PWR refers to the input voltage provided by the battery 142, and the second terminal of the first switching tube Q1 is connected to the first terminal of the inductor L1. The control end of the second switch tube Q2 is connected to the control unit 1413, the first end of the second switch tube Q2 is connected to the second end of the first switch tube Q1, and the second end of the second switch tube Q2 is connected to the ground GND.

The control end of the third switching tube Q3 is connected to the control unit 1413, the first end of the third switching tube Q3 is connected to the input ends of the TOF camera 310 and the first voltage stabilization unit 1412, respectively, that is, the first end of the third switching tube Q3 refers to the output end of the voltage conversion unit 1411, VOUT refers to the output voltage provided by the voltage conversion unit 1411 to the input ends of the TOF camera 310 and the first voltage stabilization unit 1412, and the second end of the third switching tube Q3 is connected to the second end of the inductor L1. The control end of the fourth switching tube Q4 is connected to the control unit 1413, the first end of the fourth switching tube Q4 is connected to the second end of the third switching tube Q3, and the second end of the fourth switching tube Q4 is connected to the ground GND.

The first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fourth switch tube Q4 may be metal-oxide-semiconductor (MOS) transistors. Of course, the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 may also be other suitable controllable devices, such as Bipolar Junction Transistors (BJT) devices or Insulated Gate Bipolar Transistor (IGBT) devices.

Take the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 as MOS transistors as an example. The first switching tube Q1 may be a P-type MOS transistor, the control end of the first switching tube Q1 refers to a gate of the first switching tube Q1, the first end of the first switching tube Q1 refers to a source of the first switching tube Q1, and the second end of the first switching tube Q1 refers to a drain of the first switching tube Q1, which is turned on when a low level is input to the gate and turned off when a high level is input to the gate. The second switching tube Q2 may be an N-type MOS transistor, a control terminal of the second switching tube Q2 refers to a gate of the second switching tube Q2, a first terminal of the second switching tube Q2 refers to a drain of the second switching tube Q2, and a second terminal of the second switching tube Q2 refers to a source of the second switching tube Q2, which is turned on when a high level is input to the gate and turned off when a low level is input to the gate. The third switching tube Q3 may be a P-type MOS tube, the control terminal of the third switching tube Q3 refers to the gate of the third switching tube Q3, the first terminal of the third switching tube Q3 refers to the source of the third switching tube Q3, and the second terminal of the third switching tube Q3 refers to the drain of the third switching tube Q3, which is turned on when the gate inputs a low level and turned off when the gate inputs a high level. The fourth switching tube Q4 may be an N-type MOS tube, a control end of the fourth switching tube Q4 refers to a gate of the fourth switching tube Q4, a first end of the fourth switching tube Q4 refers to a drain of the fourth switching tube Q4, and a second end of the fourth switching tube Q4 refers to a source of the fourth switching tube Q4, which is turned on when the gate inputs a high level and is turned off when the gate inputs a low level.

Of course, it can be understood that the first switch Q1 may also be replaced by an N-type MOS transistor, the second switch Q2 may also be replaced by a P-type MOS transistor, the third switch Q3 may also be replaced by an N-type MOS transistor, and the fourth switch Q4 may also be replaced by a P-type MOS transistor.

In an actual driving process of the voltage conversion unit 1411, the voltage conversion unit 1411 includes two operation modes, which are a step-down mode and a step-up mode, respectively.

When the voltage conversion unit 1411 is in the buck mode, i.e., the input voltage VPH _ PWR provided by the battery 142 is greater than the output voltage VOUT of the voltage conversion unit 1411, the control unit 1413 controls the third switching transistor Q3 to be in the on state all the time, and controls the fourth switching transistor Q4 to be in the off state all the time. In a first phase of the same period, the control unit 1413 controls the first switch Q1 to be turned on and controls the second switch Q2 to be turned off, and in a second phase of the same period, the control unit 1413 controls the first switch Q1 to be turned off and controls the second switch Q2 to be turned on. Therefore, the control unit 1413 implements a voltage reduction function by controlling the first switching tube Q1 and the second switching tube Q2 to be alternately turned on.

When the voltage conversion unit 1411 is in the boost mode, that is, the input voltage VPH _ PWR provided by the battery 142 is smaller than the output voltage VOUT of the voltage conversion unit 1411, the control unit 1413 controls the first switching tube Q1 to be always in the on state and controls the second switching tube Q2 to be always in the off state. In addition, in the first phase of the same cycle, the control unit 1413 controls the fourth switching tube Q4 to be turned on and the third switching tube Q3 to be turned off, and in the second phase of the same cycle, the control unit 1413 controls the third switching tube Q3 to be turned on and the fourth switching tube Q4 to be turned off. Therefore, the control unit 1413 controls the fourth switching tube Q4 and the third switching tube Q3 to alternately conduct to realize the boosting function.

In practical products, since the input voltage provided by the battery 142 ranges from 3.4V to 4.4V, when the TOF camera 310 is turned on during the use of the electronic device 100, the input voltage provided by the battery 142 may be smaller than the first power supply voltage or larger than the first power supply voltage.

Therefore, when the TOF camera 310 is turned on, if the input voltage provided by the battery 142 is less than the first power supply voltage, the control unit 1413 controls the voltage conversion unit 1411 to be in the boost mode, and controls the duty ratio when the fourth switching tube Q4 and the third switching tube Q3 are turned on, so that the voltage conversion unit 1411 can output the stable first power supply voltage. When the TOF camera 310 is turned on, if the input voltage provided by the battery 142 is greater than the first power supply voltage, the control unit 1413 controls the voltage conversion unit 1411 to be in the step-down mode, and the voltage conversion unit 1411 can output the stable first power supply voltage by controlling the duty ratio when the first switching tube Q1 and the second switching tube Q2 are turned on.

In the use process of the electronic device 100, when the TOF camera 310 is turned off, the input voltage provided by the battery 142 is generally greater than the second power supply voltage, and therefore, the control unit 1413 controls the voltage conversion unit 1411 to be in the step-down mode, and controls the duty ratio when the first switching tube Q1 and the second switching tube Q2 are turned on, so that the voltage conversion unit 1411 can output the stable second power supply voltage.

Fig. 4 is a voltage conversion unit 1411 composed of a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4 and an inductor L1, so as to implement a step-up mode and a step-down mode. In other embodiments, the voltage conversion unit 1411 may also include a voltage boost circuit and a voltage buck circuit, which are separately disposed, where the voltage boost circuit includes a plurality of switching transistors and an inductor to implement the voltage boost function, and the voltage buck circuit also includes a plurality of switching transistors and another inductor to implement the voltage buck function.

In some embodiments, the first voltage regulation unit 1412 may be an LDO circuit, which is an integrated circuit for outputting a regulated voltage. After the first supply voltage or the second supply voltage is input to the input end of the LDO circuit, the LDO circuit can output a preset third supply voltage, and the third supply voltage can be adjusted down on the basis of the first supply voltage or the second supply voltage.

As shown in fig. 5, the first voltage stabilization unit 1412 includes a voltage adjustment tube Q5, an error amplifier A1, a first resistor R1, a second resistor R2, and a reference power source VREF.

A control end of the voltage adjusting tube Q5 is connected to the output end of the error amplifier A1, a first end of the voltage adjusting tube Q5 is connected to the output end of the voltage converting unit 1411, that is, the first end of the voltage adjusting tube Q5 refers to the input end of the first voltage stabilizing unit 1412, and a second end of the voltage adjusting tube Q5 is connected to the internal memory 121, that is, the second end of the voltage adjusting tube Q5 refers to the output end of the first voltage stabilizing unit 1412.

A first end of the first resistor R1 is connected to the second end of the voltage regulator Q5 and the internal memory 121, and a second end of the first resistor R1 is connected to the non-inverting input terminal of the error amplifier A1. A first end of the second resistor R2 is connected to the second end of the first resistor R1 and the non-inverting input terminal of the error amplifier A1, and a second end of the second resistor R2 is connected to the ground GND. The reference power source VREF is connected to the inverting input terminal of the error amplifier A1.

The voltage adjusting tube Q5 may be a P-type MOS tube, the control end of the voltage adjusting tube Q5 refers to a gate of the voltage adjusting tube Q5, the first end of the voltage adjusting tube Q5 refers to a source of the voltage adjusting tube Q5, and the second end of the voltage adjusting tube Q5 refers to a drain of the voltage adjusting tube Q5.

In the first voltage stabilizing unit 1412 shown in fig. 5, the voltage regulating tube Q5 is equivalent to an adjustable resistor, and when the current inputted to the control terminal of the voltage regulating tube Q5 is larger, the voltage drop of the voltage regulating tube Q5 is smaller, and when the current inputted to the control terminal of the voltage regulating tube Q5 is smaller, the voltage drop of the voltage regulating tube Q5 is larger. The voltage drop of the voltage adjusting tube Q5 refers to a voltage difference obtained by subtracting the voltage of the second end of the voltage adjusting tube Q5 from the voltage of the first end of the voltage adjusting tube Q5.

In an actual working process, after the output end of the voltage conversion unit 1411 inputs the first power supply voltage or the second power supply voltage to the first end of the voltage adjusting tube Q5, the second end of the voltage adjusting tube Q5 correspondingly outputs a voltage to be adjusted, and the first resistor R1 and the second resistor R2 divide the voltage to be adjusted, so that a divided voltage is generated at a node between the first resistor R1 and the second resistor R2. Because the resistance values of the first resistor R1 and the second resistor R2 are constant, the divided voltage generated at the node between the first resistor R1 and the second resistor R2 is in direct proportion to the voltage to be adjusted output by the second end of the voltage adjusting tube Q5, and the divided voltage at the node between the first resistor R1 and the second resistor R2 acts on the non-inverting input end of the error amplifier A1. The reference voltage provided by the reference power source VREF is applied to the inverting input of the error amplifier A1.

When the voltage to be adjusted output by the second end of the voltage adjusting tube Q5 is increased relative to the preset third power supply voltage, the divided voltage acting on the non-inverting input end of the error amplifier A1 is also increased, and therefore, the current output by the output end of the error amplifier A1 to the control end of the voltage adjusting tube Q5 is reduced, so that the voltage drop of the voltage adjusting tube Q5 is increased, and the voltage output by the second end of the voltage adjusting tube Q5 is reduced to the third power supply voltage.

When the voltage to be adjusted output by the second end of the voltage adjusting tube Q5 is reduced relative to the preset third supply voltage, the divided voltage acting on the non-inverting input end of the error amplifier A1 is also reduced, and therefore, the current output by the output end of the error amplifier A1 to the control end of the voltage adjusting tube Q5 is increased, so that the voltage drop of the voltage adjusting tube Q5 is reduced, and the voltage output by the second end of the voltage adjusting tube Q5 is increased to the third supply voltage.

As can be seen from the first voltage stabilizing unit 1412 shown in fig. 5, the first voltage stabilizing unit 1412 may utilize a negative feedback mechanism of the first resistor R1 and the second resistor R2, so that the voltage output by the output terminal of the first voltage stabilizing unit 1412 is always stabilized around the third power supply voltage. Therefore, when the TOF camera 310 is turned on, the first voltage stabilization unit 1412 may stabilize the first power supply voltage output by the voltage conversion unit 1411 to a third power supply voltage, and when the TOF camera 310 is turned off, the first voltage stabilization unit 1412 may also stabilize the second power supply voltage output by the voltage conversion unit 1411 to the third power supply voltage, so that when the TOF camera 310 is turned on or turned off, the third power supply voltage may be provided to the internal memory 121, so that the internal memory 121 may operate normally.

In some embodiments, at least some of the devices in the power management module 141 may be integrated in the same power management chip, which may also be referred to as a PMIC chip.

In an alternative embodiment, as shown in fig. 6, the control unit 1413 and the first voltage stabilizing unit 1412 in the power management module 141, and the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 in the voltage conversion unit 1411 may be integrated into a same power management chip, while the inductor L1 in the voltage conversion unit 1411 is not integrated into the power management chip, and the inductor L1 may be located outside the power management chip.

As shown in fig. 6, the power management chip includes a plurality of pins, which are a VDD1 pin, a VDD2 pin, a PGND _1 pin, a PGND _2 pin, a SPMI _ CLK pin, a SPMI _ DATA pin, a VSW _ BCK _1 pin, a VSW _ BCK _2 pin, a VSW _ BST _1 pin, a VSW _ BST _2 pin, a VREG _ SNS _1 pin, a VREG _2 pin, a VREG _3 pin, a VREG _ SNS _2 pin, a VREG _4 pin, a VREG _5 pin, and the like.

The VDD1 pin and the VDD2 pin are used to connect to the battery 142, and the battery 142 may supply the input voltage VPH _ PWR to the VDD1 pin and the VDD2 pin. The PGND _1 pin and the PGND _2 pin are connected to a ground GND. The SPMI _ CLK and SPMI _ DATA pins are used to connect to corresponding pins of the processor 110, and may be understood as the SPMI interface of the control unit 1413 in the power management module 141, and the pins of the processor 110 connected to the SPMI _ CLK and SPMI _ DATA pins may be understood as the SPMI interface of the processor 110.

The VSW _ BCK _1 pin and the VSW _ BCK _2 pin are used for being connected with the first end of the inductor L1, and the VSW _ BCK _1 pin and the VSW _ BCK _2 pin can be understood as nodes connected between the first switching tube Q1 and the second switching tube Q2; the VSW _ BST _1 pin and the VSW _ BST _2 pin are used for connecting to the second terminal of the inductor L1, and the VSW _ BST _1 pin and the VSW _ BST _2 pin may be understood as nodes connected between the third switch Q3 and the fourth switch Q4.

The VREG _ SNS _1 pin, the VREG _2 pin and the VREG _3 pin are all connected with the TOF camera 310 and used for outputting a first power supply voltage to the TOF camera 310, so that the TOF camera 310 can work normally. The VREG _ SNS _2 pin, the VREG _4 pin, and the VREG _5 pin are all connected to the internal memory 121 to output a third power supply voltage to the internal memory 121 so that the internal memory 121 may normally operate.

In addition, as shown in fig. 6, the power management module 141 may further include a filtering unit 1414, a second voltage stabilization unit 1415, and a third voltage stabilization unit 1416. In an actual product, each device in the filtering unit 1414, the second voltage stabilizing unit 1415, and the third voltage stabilizing unit 1416 is not integrated into a power management chip, and is located outside the power management chip.

The first end of the filtering unit 1414 is connected to the battery 142, the first end of the filtering unit 1414 is specifically connected to the positive electrode of the battery 142, the first end of the filtering unit 1414 is further connected to the VDD1 pin and the VDD2 pin of the power management chip, and the second end of the filtering unit 1414 is connected to the ground GND. The filtering unit 1414 is used for filtering the input voltage VPH _ PWR provided by the battery 142 to reduce voltage jitter of the input voltage VPH _ PWR provided by the battery 142.

The first end of the second voltage stabilizing unit 1415 is connected with the output end of the voltage conversion unit 1411 and the TOF camera 310, the first end of the second voltage stabilizing unit 1415 is further connected with a VREG _ SNS _1 pin, a VREG _2 pin, and a VREG _3 pin of the power management chip, and the second end of the second voltage stabilizing unit 1415 is connected with a ground terminal GND. The second voltage stabilizing unit 1415 is configured to perform voltage stabilizing processing on the first power supply voltage output to the TOF camera 310 by the voltage converting unit 1411, so that the first power supply voltage output to the TOF camera 310 is more stable.

The first terminal of the third voltage stabilization unit 1416 is connected to the output terminal of the first voltage stabilization unit 1412 and the internal memory 121, the first terminal of the third voltage stabilization unit 1416 is further connected to the VREG _ SNS _2 pin, the VREG _4 pin, and the VREG _5 pin of the power management chip, and the second terminal of the third voltage stabilization unit 1416 is connected to the ground GND. The third voltage stabilizing unit 1416 is configured to perform voltage stabilizing processing on the third power supply voltage output by the first voltage stabilizing unit 1411, so that the third power supply voltage output to the internal memory 121 is more stable.

In a possible implementation manner, the filtering unit 1414 includes a first capacitor C1, a first end of the first capacitor C1 is connected to the battery 142, specifically, the first end of the first capacitor C1 is connected to the positive electrode of the battery 142, and a second end of the first capacitor C1 is connected to the ground GND.

In one possible implementation, the second voltage stabilizing unit 1415 includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. First ends of the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are all connected with the output end of the voltage conversion unit 1411 and the TOF camera 310, and second ends of the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are all connected with a ground end GND.

In a possible implementation manner, the third voltage stabilizing unit 1416 includes a sixth capacitor C6, a first terminal of the sixth capacitor C6 is connected to the output terminal of the first voltage stabilizing unit 1412 and the internal memory 121, and a second terminal of the sixth capacitor C6 is connected to the ground terminal GND.

It is understood that the filtering unit 1414, the second voltage stabilization unit 1415, and the third voltage stabilization unit 1416, may include more or less capacitors than shown in fig. 6. For example, the third voltage stabilization unit 1416 may also include two or three capacitors connected in parallel.

The power management chip shown in fig. 6 is only an optional implementation manner, and in the embodiment of the present application, only the control unit 1413, and the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 in the voltage conversion unit 1411 may be integrated into the same power management chip, and the first voltage stabilization unit 1412 may be disposed outside the power management chip. The embodiment of the present application does not limit the integration condition of the devices in the power management module 141, and the integration condition may be adjusted according to the actual condition.

In other embodiments, since the electronic device further needs to use the first buck-boost circuit and the first voltage stabilizing circuit connected thereto to supply power to the electrical loads such as the fingerprint sensor, the SIM card, and the display screen, at least some of the first buck-boost circuit and the first voltage stabilizing circuit connected thereto may be integrated into the power management chip shown in fig. 6.

If some devices in the first buck-boost circuit and the first voltage regulator circuit connected to the first buck-boost circuit are integrated into the power management chip shown in fig. 6, the power management chip actually corresponding to the first buck-boost circuit may refer to the power management chip shown in fig. 7.

As shown in fig. 7, the power management chip further includes a VDD3 pin, a VDD4 pin, a PGND _3 pin, a PGND _4 pin, a VSW _ BCK _3 pin, a VSW _ BCK _4 pin, a VSW _ BST _3 pin, a VSW _ BST _4 pin, a VREG _ SNS _3 pin, a VREG _6 pin, a VREG _7 pin, and the like.

The VDD3 pin and the VDD4 pin are also connected to the battery 142 for receiving the input voltage VPH _ PWR provided by the battery 142. Part of the devices in the first buck-boost circuit may be integrated in the power management chip, and the first buck-boost circuit may be similar to the specific circuit structure of the voltage conversion unit 1411 shown in fig. 4, four switching tubes in the first buck-boost circuit may be integrated inside the power management chip, and an inductor (e.g., L2 in fig. 7) in the first buck-boost circuit may be located outside the power management chip.

The PGND _3 pin and the PGND _4 pin are connected to a ground GND. The pin VSW _ BCK _3 and VSW _ BCK _4 are used to connect to a first terminal of an inductor in the first buck-boost circuit, and the pin VSW _ BST _3 and VSW _ BST _4 are used to connect to a second terminal of the inductor in the first buck-boost circuit.

The VREG _ SNS _3 pin, the VREG _6 pin and the VREG _7 pin are all connected with the power loads 320 such as the fingerprint sensor, the SIM card and the display screen and are used for providing 3.3V power supply voltage for the power loads 320 such as the fingerprint sensor, the SIM card and the display screen.

As shown in fig. 7, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C21, a twelfth capacitor C22, and the like are provided outside the power management chip.

The first end of the seventh capacitor C7 is connected to the VDD3 pin and the VDD4 pin of the power management chip, and the second end of the seventh capacitor C7 is connected to the ground GND. The seventh capacitor C7 is used for filtering the input voltage VPH _ PWR provided from the battery 142 to the first buck-boost circuit.

First ends of the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C21, and the twelfth capacitor C22 are all connected to the VREG _ SNS _3 pin, the VREG _6 pin, the VREG _7 pin, and the electrical load 320, and second ends of the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C21, and the twelfth capacitor C22 are all connected to the ground GND. The first buck-boost circuit is used for stabilizing the power supply voltage output by the first voltage stabilizing circuit connected to the first buck-boost circuit to the power load 320.

It should be noted that the voltage conversion unit 1411 in the power management module 141 for supplying power to the TOF camera 310 and the internal memory 121 is the same, and the first buck-boost circuit in the power management module 141 for supplying power to the power load 320 and the voltage conversion unit 1411 for supplying power to the internal memory 121 are two independently arranged circuits.

Fig. 8 is a flowchart of a power supply control method according to an embodiment of the present application. Referring to fig. 8, the power supply control method is applied to the power supply circuits shown in fig. 3 to 7, and specifically includes the following steps:

at step 801, the processor determines whether the TOF camera is on.

In the embodiment of the present application, before the power supply circuit is used to supply power, the processor 110 needs to determine whether the TOF camera 310 is turned on.

When a user needs to use the TOF camera 310, the TOF camera 310 can be requested to be turned on through a corresponding triggering operation, so that when the processor 110 determines that the TOF camera 310 needs to be turned on, the following steps 802 to 804 need to be adopted to supply power to the TOF camera 310 and a target load, and the target load can be the internal memory 121.

When the user needs to turn off the TOF camera 310, the TOF camera 310 can be requested to be turned off through a corresponding triggering operation, so that the processor 110 needs to adopt the following steps 805 to 807 to supply power to the target load when determining that the TOF camera 310 needs to be turned off.

And step 802, when the TOF camera is started, the processor sends a first control signal to the control unit.

Step 803, the control unit controls the voltage conversion unit to convert the input voltage provided by the power supply into a first power supply voltage according to the first control signal; the first supply voltage is used for supplying power to the TOF camera.

Step 804, the first voltage stabilization unit performs voltage stabilization processing on the first power supply voltage to obtain a third power supply voltage; the third supply voltage is used to supply the target load.

When the processor 110 determines that the TOF camera 310 needs to be turned on, the processor 110 sends a first control signal to the control unit 1413, and after receiving the first control signal, the control unit 1413 may control the operating state of the voltage conversion unit 1411 according to the first control signal, so that the voltage conversion unit 1411 may convert the input voltage provided by the power supply into the first power supply voltage. Wherein the power supply may be a battery 142.

The first supply voltage may power the TOF camera 310 such that the TOF camera 310 may function normally. In addition, the first power supply voltage obtained by the conversion of the voltage conversion unit 1411 is also input to the first voltage stabilization unit 1412, the first voltage stabilization unit 1412 performs voltage stabilization processing on the first power supply voltage to obtain a third power supply voltage, and the third power supply voltage can supply power to the target load, so that the target load can normally operate.

In step 805, the processor sends a second control signal to the control unit when the TOF camera is turned off.

In step 806, the control unit controls the voltage conversion unit to convert the input voltage provided by the power supply into a second power supply voltage according to the second control signal.

Step 807, the first voltage stabilizing unit performs voltage stabilization processing on the second power supply voltage to obtain a third power supply voltage; the third supply voltage is used to supply the target load.

When the processor 110 determines that the TOF camera 310 needs to be turned off, the processor 110 sends a second control signal to the control unit 1413, and after receiving the second control signal, the control unit 1413 may control the operating state of the voltage conversion unit 1411 according to the second control signal, so that the voltage conversion unit 1411 converts the input voltage provided by the battery 142 into a second power supply voltage.

The second power supply voltage converted by the voltage conversion unit 1411 is input to the first voltage stabilization unit 1412, the first voltage stabilization unit 1412 performs voltage stabilization processing on the second power supply voltage to obtain a third power supply voltage, and the third power supply voltage can supply power to the target load, so that the target load can normally operate.

Therefore, the voltage conversion unit 1411 originally supplying power to the target load in the power management module 141 included in the electronic device 100 is used for supplying power to the TOF camera 310, and when the target load can work normally, a buck-boost chip independently supplying power to the TOF camera 310 in the electronic device 100 can be eliminated, so that the occupied area of devices on a main board is reduced, and the cost of the electronic device 100 is reduced.

The above embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above embodiments are only for the purpose of describing the embodiments of the present application and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.

Claims

1. A power supply circuit is characterized by comprising a power supply management module, a TOF camera and a target load, wherein the power supply management module comprises a voltage conversion unit, a first voltage stabilizing unit and a control unit;

the input end of the voltage conversion unit is connected with a power supply, the output end of the voltage conversion unit is respectively connected with the TOF camera and the input end of the first voltage stabilization unit, and the output end of the first voltage stabilization unit is connected with the target load;

the voltage conversion unit is used for converting the input voltage provided by the power supply into a first power supply voltage when the TOF camera is started; when the TOF camera is turned off, converting the input voltage provided by the power supply into a second power supply voltage;

the first voltage stabilizing unit is used for performing voltage stabilizing processing on the first power supply voltage or the second power supply voltage to obtain a third power supply voltage;

the first power supply voltage is used for supplying power to the TOF camera, and the third power supply voltage is used for supplying power to the target load;

the voltage conversion unit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and an inductor;

the control end of the first switch tube is connected with the control unit, the first end of the first switch tube is connected with the power supply, and the second end of the first switch tube is connected with the first end of the inductor;

the control end of the second switch tube is connected with the control unit, the first end of the second switch tube is connected with the second end of the first switch tube, and the second end of the second switch tube is connected with the ground end;

the control end of the third switch tube is connected with the control unit, the first end of the third switch tube is respectively connected with the TOF camera and the input end of the first voltage stabilizing unit, and the second end of the third switch tube is connected with the second end of the inductor;

the control end of the fourth switching tube is connected with the control unit, the first end of the fourth switching tube is connected with the second end of the third switching tube, and the second end of the fourth switching tube is connected with the grounding end;

the first voltage stabilizing unit comprises a voltage adjusting tube, an error amplifier, a first resistor, a second resistor and a reference power supply;

the control end of the voltage adjusting tube is connected with the output end of the error amplifier, the first end of the voltage adjusting tube is connected with the output end of the voltage conversion unit, and the second end of the voltage adjusting tube is connected with the target load;

the first end of the first resistor is connected with the second end of the voltage adjusting tube, and the second end of the first resistor is connected with the non-inverting input end of the error amplifier;

the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with a ground terminal;

the reference power supply is connected with the inverting input terminal of the error amplifier.

2. The power supply circuit of claim 1, wherein the first power supply voltage is greater than the second power supply voltage, and wherein the second power supply voltage is greater than the third power supply voltage.

3. The power supply circuit of claim 1, further comprising a processor, the processor being connected to the control unit, the control unit being further connected to a voltage conversion unit;

the processor is used for sending a first control signal to the control unit when the TOF camera is started; when the TOF camera is closed, sending a second control signal to the control unit;

the control unit is used for controlling the voltage conversion unit to convert the input voltage provided by the power supply into a first power supply voltage according to the first control signal; and controlling the voltage conversion unit to convert the input voltage provided by the power supply into a second power supply voltage according to the second control signal.

4. The power supply circuit of claim 3, wherein the processor and the control unit are connected by an SPMI bus.

5. The power supply circuit according to claim 1, wherein the power management module further comprises a filtering unit, a first end of the filtering unit is connected to the power supply, and a second end of the filtering unit is connected to a ground end;

the filtering unit is used for filtering the input voltage provided by the power supply;

the filtering unit comprises a first capacitor, a first end of the first capacitor is connected with the power supply, and a second end of the first capacitor is connected with the grounding terminal.

6. The power supply circuit according to claim 1, wherein the power management module further includes a second voltage stabilizing unit, a first end of the second voltage stabilizing unit is connected to the output end of the voltage conversion unit and the TOF camera, and a second end of the second voltage stabilizing unit is connected to a ground end;

the second voltage stabilizing unit is used for stabilizing the first power supply voltage output to the TOF camera by the voltage conversion unit;

the second voltage stabilizing unit comprises a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor; first ends of the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are all connected with an output end of the voltage conversion unit and the TOF camera, and second ends of the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are all connected with the grounding end.

7. The power supply circuit according to claim 1, wherein the power management module further comprises a third voltage stabilization unit, a first end of the third voltage stabilization unit is connected to the output end of the first voltage stabilization unit and the target load, and a second end of the third voltage stabilization unit is connected to a ground end;

the third voltage stabilizing unit is used for performing voltage stabilizing processing on the third power supply voltage output by the first voltage stabilizing unit;

the third voltage stabilizing unit comprises a sixth capacitor, a first end of the sixth capacitor is connected with the output end of the first voltage stabilizing unit and the target load, and a second end of the sixth capacitor is connected with the ground end.

8. The power supply circuit according to any one of claims 1 to 7, wherein the target load is an internal memory.

9. An electronic device characterized by comprising a power supply source and the power supply circuit according to any one of claims 1 to 8; the power supply is a battery in the electronic device.

10. A power supply control method applied to the power supply circuit according to any one of claims 1 to 8, the method comprising:

when the TOF camera is started, a voltage conversion unit converts input voltage provided by a power supply into first power supply voltage, wherein the voltage conversion unit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and an inductor;

the control end of the first switching tube is connected with the control unit, the first end of the first switching tube is connected with the power supply, and the second end of the first switching tube is connected with the first end of the inductor;

the first voltage stabilizing unit is used for performing voltage stabilizing processing on the first power supply voltage to obtain a third power supply voltage, wherein the first voltage stabilizing unit comprises a voltage adjusting tube, an error amplifier, a first resistor, a second resistor and a reference power supply;

the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with a grounding end;

the reference power supply is connected with the inverting input end of the error amplifier;

when the TOF camera is turned off, the voltage conversion unit converts the input voltage provided by the power supply into a second power supply voltage;

the first voltage stabilizing unit is used for stabilizing the second power supply voltage to obtain a third power supply voltage;

the first power supply voltage is used for supplying power to the TOF camera, and the third power supply voltage is used for supplying power to a target load.

11. The method according to claim 10, wherein when the TOF camera is turned on, the voltage conversion unit converts an input voltage provided by a power supply into a first power supply voltage, and the method comprises:

when the TOF camera is started, the processor sends a first control signal to the control unit;

the control unit controls the voltage conversion unit to convert the input voltage provided by the power supply into a first power supply voltage according to the first control signal;

when the TOF camera is closed, the voltage conversion unit converts the input voltage provided by the power supply into a second power supply voltage, and the method comprises the following steps:

when the TOF camera is closed, the processor sends a second control signal to the control unit;

and the control unit controls the voltage conversion unit to convert the input voltage provided by the power supply into a second power supply voltage according to the second control signal.