Power supply circuit and electronic equipment

Abstract

The utility model provides a power supply circuit and electronic equipment. The power supply circuit includes: a plurality of batteries; the plurality of output ends are in one-to-one correspondence with the plurality of batteries and are connected with anodes of the corresponding batteries, and the batteries are used for supplying power to equipment loads based on the corresponding output ends; the input end is connected with the positive electrode of one battery in the plurality of batteries and is used for charging the plurality of batteries; the at least one first switch is in one-to-one correspondence with other batteries in the plurality of batteries; the at least one second switch is in one-to-one correspondence with the other batteries; wherein the first switch is connected with the positive electrode of the corresponding battery and the negative electrode of the upper-level battery of the batteries in the preset series connection sequence, the second switch is connected with the negative electrode of the corresponding battery and the negative electrode of the upper-level battery of the batteries in the series connection sequence, and the battery connected with the input end is the uppermost-level battery in the series connection sequence.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power supply circuit, and in particular to a power supply circuit and an electronic device. BACKGROUND

[0002] Based on the compatibility of the internal space of the fuselage, the charging speed, and the power supply demand of the fuselage, and other aspects, multi-battery power supply solutions such as double-battery (also known as battery cell) power supply solutions are increasingly valued.

[0003] In order to maximize the charging speed, in the multi-battery power supply solution, a circuit architecture in which multiple batteries are connected in series with each other is often used. Under this architecture, the same charging current can bring several times the charging power of a single battery, but the voltage across the two ends is also several times that of a single battery, and needs to be stepped down by a pre-prepared charge pump before it can be used to supply the device load, which is very costly. SUMMARY

[0004] To overcome the problems in the related art, the present disclosure provides a power supply circuit and an electronic device.

[0005] The first aspect of the present disclosure provides a power supply circuit, the circuit comprising:

[0006] a plurality of batteries;

[0007] a plurality of output terminals corresponding one-to-one to the plurality of batteries and connected to the positive poles of the corresponding batteries, the batteries being configured to supply power to a device load based on the corresponding output terminals;

[0008] an input terminal connected to the positive pole of one of the plurality of batteries, the input terminal being configured to charge the plurality of batteries;

[0009] at least one first switch corresponding one-to-one to other batteries in the plurality of batteries;

[0010] at least one second switch corresponding one-to-one to the other batteries;

[0011] wherein the first switch connects the positive pole of the corresponding battery to the negative pole of the upper-level battery of the battery in a preset series connection order, the second switch connects the negative pole of the corresponding battery to the negative pole of the upper-level battery of the battery in the series connection order, and the battery connected to the input terminal is the top-level battery in the series connection order.

[0012] Optionally, the input terminal is configured to be connected to a charge pump and receive electrical energy provided by the charge pump, wherein the charge pump is configured to receive electrical energy provided by a charger and convert the electrical energy provided by the charger to supply power to the plurality of batteries.

[0013] Optionally, the plurality of batteries have the same resistance and charging voltage, and the charge pump is configured to convert a voltage provided by the charger into a sum of the charging voltages of the plurality of batteries and input the sum to the input terminal.

[0014] Optionally, the circuit further comprises:

[0015] a plurality of system power terminals corresponding to the plurality of output terminals one-to-one, the system power terminals being configured to connect to device loads and supply power to the device loads;

[0016] a plurality of third switches corresponding to the plurality of output terminals one-to-one, each third switch being disposed between a corresponding output terminal and a corresponding system power terminal.

[0017] Optionally, the circuit further comprises:

[0018] a buck chopper circuit configured to receive power provided by the charger through a high-voltage terminal and convert the power provided by the charger to supply power to the device loads through a low-voltage terminal.

[0019] Optionally, the circuit further comprises:

[0020] a plurality of fourth switches corresponding to the plurality of system power terminals one-to-one, each system power terminal being connected to the low-voltage terminal of the buck chopper circuit through a corresponding fourth switch.

[0021] Optionally, at least one of the first switch, the second switch, and the fourth switch has a unidirectional conduction state and a bidirectional conduction state.

[0022] Optionally, the fourth switch comprises a metal-oxide-semiconductor field-effect transistor having a parasitic diode.

[0023] Among the plurality of fourth switches, a parasitic diode of a fourth switch corresponding to a battery connected to the input terminal is configured to conduct a current path from the low-voltage terminal to a system power terminal corresponding to the battery connected to the input terminal, and a parasitic diode of a fourth switch corresponding to another battery is configured to conduct a current path from a system power terminal corresponding to the another battery to the low-voltage terminal.

[0024] Optionally, the buck chopper circuit comprises a buck chopper circuit in a power supply integrated management chip.

[0025] A second aspect of the present disclosure provides an electronic device equipped with the power supply circuit of the first aspect.

[0026] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects:

[0027] In the embodiments of the present disclosure, the first switch and the second switch can be used to flexibly change the connection relationship between the plurality of batteries. For example, when the negative poles of the plurality of batteries are connected to each other, the batteries are in parallel connection; when the positive poles of the plurality of batteries are connected to the negative pole of the battery at the upper level, the batteries are in series connection. In the parallel connection, the voltages of the plurality of batteries are not superimposed, so that the voltage provided by the batteries can be directly used to supply the device load without the need of performing voltage conversion by the charge pump; in the series connection, the plurality of batteries can generate higher charging power under the same current and can accept larger charging voltage (which is distributed on the plurality of batteries). Based on this, the circuit provided by the present disclosure can not only have the advantage of fast charging of the series connection of the plurality of batteries, but also greatly reduce the cost and improve the flexibility of battery management without the need of separately arranging the charge pump and configuring the voltage conversion logic.

[0028] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure together with the description.

[0030] Figure 1 FIG. 1 is a schematic diagram of a power supply circuit according to some example embodiments.

[0031] Figure 2 FIG. 2 is a schematic diagram of another power supply circuit according to some example embodiments.

[0032] Figure 3 FIG. 3 is a schematic diagram of still another power supply circuit according to some example embodiments.

[0033] Figure 4 FIG. 4 is a schematic diagram of yet another power supply circuit according to some example embodiments.

[0034] Figure 5 FIG. 5 is a hardware structure diagram of an electronic device according to some example embodiments. DETAILED DESCRIPTION

[0035] The example embodiments will be described in detail herein with reference to the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following example embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of power supply circuits and electronic devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0036] As described in the background, the existing multi-battery power supply scheme (hereinafter, the dual-battery power supply scheme will be taken as an example for illustration) is mainly applied in devices with special-shaped bodies such as foldable-screen mobile phones or devices requiring high-power charging. The main battery power supply schemes include two batteries in parallel (for example, applied to foldable-screen mobile phones, hereinafter, the case of multiple batteries in parallel is referred to as a parallel architecture) or two batteries in series (hereinafter, referred to as a series architecture).

[0037] In the parallel architecture, since the battery voltage is still the voltage of a single battery, the charging is often limited by the maximum current of the data line, and the problem of excessive charging current that significantly reduces the circuit efficiency may also occur. The charging power is much lower than that of the series architecture. However, in the parallel architecture, the battery voltage can directly power the system (generally, the battery voltage is designed in reference to the power supply voltage that can be accepted by the device load, so as to balance the adaptability to the device and the charging power).

[0038] Please refer to Figure 1 In the series architecture, the battery voltage is twice that of a single battery (in the case of dual batteries). In the case of the same current, the charging power is twice that of the parallel architecture, and the charging effect is better (because the charging current is often limited by the maximum current that can be tolerated by the data line, or by the limitation of excessive charging current that significantly reduces the circuit efficiency, while the conversion and processing of voltage are relatively easier). The corresponding disadvantage is that when the battery is powered, a 2:1 charge pump needs to be added to reduce the voltage of the dual batteries in the series architecture to the voltage of a single battery, so as to be used for powering the device load. Affected by the efficiency of the 2:1 charge pump, the power supply efficiency of the series architecture is also not ideal, and the cost is also greatly increased.

[0039] Therefore, the present disclosure provides a power supply circuit and an electronic device. Next, the embodiments of the present disclosure will be described in detail.

[0040] The first aspect of the present disclosure provides a power supply circuit, which can be applied to electronic devices such as mobile phones, tablet computers, etc. The circuit can include: a plurality of batteries; a plurality of output terminals corresponding one-to-one to the plurality of batteries and connected to the positive poles of the corresponding batteries, the batteries being configured to power a device load based on the corresponding output terminals; an input terminal connected to the positive pole of one of the plurality of batteries, the input terminal being configured to charge the plurality of batteries; at least one first switch corresponding one-to-one to the other batteries; and at least one second switch corresponding one-to-one to the other batteries.

[0041] The first switch is connected to the positive pole of the corresponding battery and the negative pole of the upper level battery in the preset series connection sequence, and the second switch is connected to the negative pole of the corresponding battery and the negative pole of the upper level battery in the preset series connection sequence. The battery connected to the input end is the top level battery in the series connection sequence.

[0042] The series connection sequence is preset, which represents the order in which the multiple batteries are connected to each other. In other words, it can be used to represent the order in which the current flows through the batteries during the charging process. In this order, if battery A is directly connected to battery B (i.e., there is no other battery in the connection path of the two batteries), and the current flows through battery A first and then through battery B, then battery A can be referred to as the upper level battery of battery B, and battery B can be referred to as the lower level battery of battery A. The battery without an upper level battery in the series connection sequence is the top level battery, and the battery without a lower level battery is the bottom level battery.

[0043] Please refer to Figure 2 The above embodiment is illustrated by taking the multiple batteries as an example of including two batteries (i.e., a first battery and a second battery). It should be understood that when the above circuit includes more batteries, the principle is the same as when it includes two batteries. It can be understood that the additional batteries are arranged after the second battery, and are connected in sequence in a similar manner to the connection of the second battery and the first battery (of course, each battery also has a corresponding output end, which is not described here). In the following, the embodiment will be described around Figure 2 The above embodiment is illustrated by taking the multiple batteries as an example of including two batteries (i.e., a first battery and a second battery). It should be understood that when the above circuit includes more batteries, the principle is the same as when it includes two batteries. It can be understood that the additional batteries are arranged after the second battery, and are connected in sequence in a similar manner to the connection of the second battery and the first battery (of course, each battery also has a corresponding output end, which is not described here). In the following, the embodiment will be described around

[0044] In Figure 2In the middle (the meaning of the switch icon in the figure will be described in detail later, in some embodiments, the switch can be regarded as a common switch with two states of bidirectional conduction and bidirectional cut-off, such as a common metal oxide semiconductor field effect transistor MOSFET), S1 is an output end corresponding to the first battery, S2 is an output end corresponding to the second battery, and V1 is an input end; the PMIC (Power Management Integrated Circuit, power management integrated chip) can be a PMIC assembled in the device, which can include a Buck circuit (that is, the voltage reduction and chopping circuit can include a voltage reduction and chopping circuit in the power integrated management chip), which can be used to convert the voltage of the power supply bus and supply power to the battery or system load (hereinafter referred to as device load) based on the converted voltage. That is, the circuit can also include: a voltage reduction and chopping circuit for receiving power provided by the charger through a high-voltage end, and converting the power provided by the charger to supply power to the device load through a low-voltage end. In Figure 2 In the middle, the high-voltage end of the Buck circuit is connected to the power supply bus, and the low-voltage end is another end (connected to Q41 and Q42 in the figure) led out by the Buck circuit.

[0045] Optionally, the input end is used to be connected to a charge pump and receive power provided by the charge pump, wherein the charge pump is used to receive power provided by the charger and convert the power provided by the charger to supply power to the plurality of batteries. This is because for mobile devices (especially high-power fast-charging devices), the charger charging voltage is often very large and a known constant value, and the charging voltage of the battery is actually also a constant value (of course, the present disclosure does not concern the change of the charging voltage of the battery during the charging process due to the increase of the electric quantity), therefore, this voltage conversion process can be realized by using a charge pump, and the voltage conversion configuration of the charge pump is relatively fixed, but its voltage conversion efficiency is higher than that of the Buck circuit, and the heat generation is much lower than that of the Buck circuit, so deploying the charge pump to supply power to the battery during the charging process of the battery can realize a voltage conversion process with better effect at a lower cost and heat generation.

[0046] Optionally, the multiple batteries have the same resistance and charging voltage, and the charge pump is configured to convert the voltage provided by the charger into the sum of the charging voltages of the multiple batteries and input the sum into the input terminal. Specifically, since the batteries may age during use and thus change in resistance, the specifications (e.g., voltage, resistance) of the multiple batteries can be unified to make the above circuit more robust during use. In addition, controlling the specifications of each battery to be the same can also ensure that the voltage division of each battery is controllable during charging, and thus the voltage of the node between each battery is also controllable. For example, in the example shown, the charging and discharging voltages of each battery and the supply voltage required by the device load are all 5V. Although the voltage at V1 is 10V when the two batteries are connected in series, the voltage at S2 connected to the positive electrode of the second battery is still 5V, which can be directly used to supply power to the system load. Figure 2

[0047] For the first switch and the second switch, the following different battery connection modes can be exemplarily listed.

[0048] When the first switch is on and the second switch is off (if the circuit contains three or more batteries, then each first switch can be on and each second switch can be off, and similar conditions apply hereinafter), Figure 2 The current path in the circuit example shown is actually as shown in Figure 3 More details about the PMIC shown in the drawing will be described hereinafter. At this time, the charge pump can supply power to V1, the positive electrode of the first battery is connected to V1, the positive electrode of the second battery is connected to the negative electrode of the first battery, and the negative electrode of the second battery is connected to the charge pump to form a current loop. At this time, the first battery and the second battery are in a series state, and have a higher charging power under the same current (this charging process can be stopped after a certain battery is fully charged).

[0049] When the second switch is on and the first switch is off, please refer to Figure 4 At this time, the negative electrode of the first battery is connected to the negative electrode of the second battery, the positive electrode of the first battery is connected to S1, and the positive electrode of the second battery is connected to S2. At this time, the first battery and the second battery are in a parallel state, and they can discharge separately or jointly, and provide a 5V voltage to the corresponding output terminal (which can also be the same terminal), which can be directly supplied to the device load without the need for an additional charge pump to convert the voltage during battery discharge.

[0050] ​In the embodiments of the present disclosure, the first switch and the second switch can be used to flexibly change the connection relationship between the plurality of batteries. For example, when the negative poles of the plurality of batteries are connected to each other, the batteries are in parallel connection; when the positive poles of the plurality of batteries are connected to the negative pole of the battery at the upper level, the batteries are in series connection. In the parallel connection, the voltages of the plurality of batteries are not superimposed, and thus the voltage provided by the batteries can be directly used to supply the device load without the need of performing voltage conversion by the charge pump; in the series connection, the plurality of batteries can generate higher charging power under the same current and can accept larger charging voltage (which is distributed on the plurality of batteries). Based on this, the circuit provided by the present disclosure can have the advantages of the series connection of the plurality of batteries without the need of separately arranging the charge pump and configuring the voltage conversion logic, and can greatly reduce the cost and improve the flexibility of battery management.

[0051] In some embodiments, the circuit can further include a plurality of system power terminals corresponding to the plurality of output terminals one by one, the system power terminals being used to connect the device load and supply power to the device load; and a plurality of third switches corresponding to the plurality of output terminals one by one, each third switch being arranged between the corresponding output terminal and the corresponding system power terminal.

[0052] In Figure 2 Q31 (in the figure, the third switch is composed of two switch icons in brackets) is the third switch corresponding to S1, Q32 is the third switch corresponding to S2, P1 is the system power terminal corresponding to S1, and P2 is the system power terminal corresponding to S2. When the third switch is turned on, the path between the system power terminal and the battery is turned on, and the device load can take power from the system power terminal corresponding to the third switch (for example, in the parallel branch).

[0053] In addition, the circuit can further include a plurality of fourth switches corresponding to the plurality of system power terminals one by one, and each system power terminal is connected to the low-voltage end of the buck chopper circuit through the corresponding fourth switch.

[0054] In Figure 2In the above, Q41 is the fourth switch corresponding to P1 (from the connection relationship already described, it can be seen that Q41, P1, Q31, S1, V1 and the first battery can all be regarded as having a corresponding relationship), and Q42 is the fourth switch corresponding to P2. When Q41 is turned on and Q42 is turned off, the low-voltage end of the Buck circuit can provide 10V power supply to P1. At this time, if Q31 is turned on, the 10V power supply can be used to charge the first battery and the second battery. At this time, if Q32 is further turned on, the 5V voltage at the positive electrode of the second battery can reach P2 through Q32 and be used to supply power to the device load. When Q42 is turned on and Q41 is turned off, the low-voltage end of the Buck circuit can output 5V voltage, which can be provided to P2 and used to supply power to the device load. At this time, if Q32 is turned on, the 5V voltage can also be used to charge the second battery. In summary, the on-off state of each of the third switch and the fourth switch can switch the charging and discharging strategy of the battery.

[0055] Further, at least one of the first switch, the second switch and the fourth switch can have a unidirectional conduction state and a bidirectional conduction state.

[0056] It is mentioned above that the switches in the present disclosure can be ordinary switches having bidirectional conduction and bidirectional blocking states (for example, the first switch, the second switch, the third switch and the fourth switch can all be metal oxide semiconductor field effect transistors MOSFETs which are more common), and alternatively, the switches in the present disclosure can also be switches having a unidirectional conduction state and a bidirectional conduction state, for example, metal oxide semiconductor field effect transistors with a parasitic diode (of course, it can also be realized based on other ways, for example, a diode can be directly connected in parallel with an ordinary MOSFET). For example, when the gate voltage is greater than a certain value, the switches can conduct current in two directions, and when the gate voltage is less than or equal to the value, the switches can only conduct current in one direction (the current can be conducted based on the parasitic diode).

[0057] In the switches shown in the drawings of the present disclosure, the diode icon inside the switch icon represents the conduction direction of the switch in the unidirectional conduction state. For example, in the plurality of fourth switches, the parasitic diode of the fourth switch corresponding to the battery connected to the input end is used to conduct the current path from the low-voltage end to the system power supply end corresponding to the battery connected to the input end, and the parasitic diode of the fourth switch corresponding to the other battery is used to conduct the current path from the system power supply end corresponding to the battery to the low-voltage end. The parasitic diode in the first switch can be used to conduct the current flowing to the positive electrode of the corresponding battery (to prevent the battery from generating a series path with other batteries during discharging), and the parasitic diode in the second switch can be used to block the current flowing to the negative electrode of the corresponding battery.

[0058] Based on this, the switching element in the circuit can automatically present a certain state without intentionally giving a certain gate voltage, so as to reduce the control cost of the circuit as much as possible and realize the controllable cutoff effect (the "cutoff" can be understood as the "anti-backflow" in general); at the same time, since the parasitic diode is often naturally formed in the switching manufacturing process, this setting mode can also reduce the material cost and provide support for other optional functions of the circuit.

[0059] For example, in the case where neither Q41 nor Q42 is triggered, if the battery is currently in a parallel discharge state, the current of the second battery will pass through S2, Q32, P2, Q42 and Q41 to reach P1, and converge with the current of the first battery at P1; at this time, the device load can receive the power supply provided by the combination of the first battery and the second battery at P1, which can be directly used to supply the device load. It should be understood that the concept of "not triggered" here can also be understood as not being turned on, and the non-conduction here is for the case where the switch is a switch with a parasitic diode, that is, "non-conduction" means that Q41 and Q42 are currently in a one-way conduction state (correspondingly, "triggering" means that the switch is bidirectionally turned on); and the "turning on" in the foregoing is for the case where the switch is a normal switch, and in the embodiment described in the foregoing, if the switch is a switch with a parasitic diode, the description about "turning on" above can be adaptively modified according to the direction of the current, for example, when a certain switch is not triggered, the switch can automatically conduct the current in the current direction required by itself (for example Figure 2 Q41 itself allows the current supplied by the Buck circuit in the PMIC to pass through the first battery and the second battery), then this switch can not be triggered, and the direction of the current can be determined according to the description above and the drawings of the present disclosure

[0060] In a second aspect, the present disclosure also provides an electronic device equipped with the power supply circuit as described in the first aspect, please refer to the accompanying Figure 5 which exemplarily shows a hardware schematic diagram of an electronic device. For example, the device 500 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0061] The device 500 can include one or more of the following components: a processing component 501, a memory 502, a power supply component 503, a multimedia component 504, an audio component 505, an input / output (I / O) interface 506, a sensor component 507, and a communication component 508.

[0062] The processing component 501 generally controls the overall operations of the device 500, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 501 can include one or more processors 509 to execute instructions and to complete control logic for the above-mentioned circuitry, such as the control of switches. Further, the processing component 501 can include one or more modules to facilitate the interaction between the processing component 501 and other components. For example, the processing component 501 can include a multimedia module to facilitate the interaction between the multimedia component 504 and the processing component 501.

[0063] The memory 502 is configured to store various types of data to support operations of the device 500. Examples of these data include instructions for any application or circuitry operating on the device 500, contact data, phonebook data, messages, pictures, videos, and so on. The memory 502 can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disks, or optical disks.

[0064] The power component 503 provides power to the various components of the device 500. The power component 503 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 500.

[0065] The multimedia component 504 includes a screen providing an output interface between the device 500 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touch, swiping, and gestures on the touch panel. The touch sensors can not only sense a boundary of a touch or swipe action, but also detect duration and pressure related to the touch or swipe action. In some embodiments, the multimedia component 504 includes a front-facing camera and / or a rear-facing camera. The front-facing camera and / or the rear-facing camera can receive external multimedia data when the device 500 is in an operation mode, such as a shooting mode or a video mode. Each of the front-facing camera and the rear-facing camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0066] The audio component 505 is configured to output and / or input audio signals. For example, the audio component 505 includes a microphone (MIC) that is configured to receive an external audio signal when the device 500 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 502 or transmitted via the communication component 508. In some embodiments, the audio component 505 also includes a speaker for outputting audio signals.

[0067] The I / O interface 506 provides an interface between the processing component 501 and peripheral interface modules, which can be a keypad, a click wheel, buttons, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0068] The sensor component 507 includes one or more sensors for providing status assessments for various aspects of the device 500. For example, the sensor component 507 can detect an open / closed position of the device 500, relative positioning of components, such as a display and a keypad of the device 500, a change of position of the device 500 or a component of the device 500, presence or absence of user contact with the device 500, orientation or acceleration / deceleration / g-force and temperature of the device 500. The sensor component 507 can also include proximity sensor configured to detect presence of a nearby object without any physical touch. The sensor component 507 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 507 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0069] The communication component 508 is configured to facilitate wired or wireless communication between the device 500 and another device. The device 500 can access a wireless network based on a communication standard, such as Wi-Fi, 2G or 3G, 4G or 5G, or a combination thereof. In an example embodiment, the communication component 508 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication component 508 also includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) techniques, infrared data association (IrDA) techniques, ultra-wideband (UWB) techniques, Bluetooth (BT) techniques, and other techniques.

[0070] In exemplary embodiments, the apparatus 500 can be implemented with one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic elements, for supporting the above-described power supply circuit.

[0071] The above description of specific embodiments of the disclosure has been presented for the purpose of illustration. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. Additionally, the process depicted in the figures does not necessarily require the particular order shown, or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0072] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features of the disclosure as set forth in the following claims. As various changes could be made in the above constructions, methods, and order of events, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. The true scope of the disclosure is indicated by the appended claims.

[0073] It should be understood that the present disclosure is not limited to the precise structures herein described and illustrated, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is indicated by the appended claims, rather than by the foregoing description.

[0074] The above descriptions are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A power supply circuit, characterized by comprising: The circuit comprises: a plurality of batteries; a plurality of output terminals corresponding to the plurality of batteries respectively and connected to the positive poles of the corresponding batteries, the batteries being configured to supply power to a device load based on the corresponding output terminals; an input terminal connected to the positive pole of one of the plurality of batteries, the input terminal being configured to charge the plurality of batteries; at least one first switch corresponding to each of the other batteries of the plurality of batteries; at least one second switch corresponding to each of the other batteries; wherein the first switch connects the positive pole of the corresponding battery to the negative pole of the battery's previous stage in a preset series connection sequence, and the second switch connects the negative pole of the corresponding battery to the negative pole of the battery's previous stage in the series connection sequence, and the battery connected to the input terminal is the topmost battery in the series connection sequence.

2. The power supply circuit according to claim 1, characterized in that, The input terminal is configured to be connected to a charge pump and receive power provided by the charge pump, wherein the charge pump is configured to receive power provided by a charger and convert the power provided by the charger to supply power to the plurality of batteries.

3. The power supply circuit of claim 2, wherein, The plurality of batteries have the same resistance and charging voltage, and the charge pump is configured to convert the voltage provided by the charger to the sum of the charging voltages of the plurality of batteries and input the sum to the input terminal.

4. The power supply circuit of claim 1, wherein, The circuit further comprises: a plurality of system power terminals corresponding to the plurality of output terminals respectively, the system power terminals being configured to be connected to a device load and supply power to the device load; a plurality of third switches corresponding to the plurality of output terminals respectively, each third switch being arranged between the corresponding output terminal and the corresponding system power terminal.

5. The power supply circuit of claim 4, wherein, The circuit further comprises: a step-down chopper circuit configured to receive power provided by a charger through a high-voltage terminal and convert the power provided by the charger to supply power to a device load through a low-voltage terminal.

6. The power supply circuit of claim 5, wherein, The circuit further comprises: a plurality of fourth switches corresponding to the plurality of system power terminals respectively, each system power terminal being connected to the low-voltage terminal of the step-down chopper circuit through the corresponding fourth switch.

7. The power supply circuit of claim 6, wherein, At least one of the first switch, the second switch, and the fourth switch has a unidirectional conduction state and a bidirectional conduction state.

8. The power supply circuit of claim 6, wherein, The fourth switch comprises a metal-oxide-semiconductor field-effect transistor having a parasitic diode; In the plurality of fourth switches, the parasitic diode of the fourth switch corresponding to the battery connected to the input terminal is configured to conduct a current path from the low-voltage terminal to the system power terminal corresponding to the battery connected to the input terminal, and the parasitic diode of the fourth switch corresponding to the other batteries is configured to conduct a current path from the system power terminal corresponding to the corresponding battery to the low-voltage terminal.

9. The power supply circuit of claim 5, wherein, The step-down chopper circuit comprises a step-down chopper circuit in a power supply integrated management chip.

10. An electronic device, comprising: The electronic device is equipped with a power supply circuit as claimed in any one of claims 1 to 9.

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