Power supply circuit and electronic device

Abstract

This application provides a power supply circuit and an electronic device. The power supply circuit includes: a first main circuit, which includes a power chip and a first output branch. The power chip is electrically connected to an input terminal to convert a received input voltage into a first voltage output through the first output branch; and at least one set of second main circuits connected in parallel to the first main circuit. The at least one set of second main circuits includes a voltage regulating branch and a second output branch. One end of the voltage regulating branch is connected between the input terminal and the input terminal of the power chip. The power chip adjusts the input voltage received by the voltage regulating branch based on the first voltage to a second voltage output through the second output branch, so that the power supply circuit simultaneously outputs the first voltage and the second voltage, wherein the first voltage and the second voltage may be the same or different.

Description

Technical Field

[0001] This application relates to a power supply circuit and an electronic device. Background Technology

[0002] In power supply design for consumer electronics devices, DC buck converters are a common topology, converting high DC voltages into stable low voltages to power the devices. While standard single-output buck power supply chips are low-cost and simple in structure, they can only output a single voltage and cannot meet the needs of multiple independent power supplies.

[0003] Existing multi-output solutions require dedicated chips, but these chips have poor versatility and often require customization, resulting in long development cycles and high costs. At the same time, there are few suppliers of such chips, which are easily limited by production capacity, delivery time, and cost, reducing the flexibility of the solution and hindering the miniaturization and cost reduction of consumer electronics. Summary of the Invention

[0004] The purpose of this application is to provide a power supply circuit, including:

[0005] The first main circuit includes a power chip and a first output branch. The power chip is electrically connected to the input terminal to convert the received input voltage into a first voltage output through the first output branch. At least one set of second main circuits is connected in parallel to the first main circuit. Each set of second main circuits includes a voltage regulating branch and a second output branch. One end of the voltage regulating branch is connected between the input terminal and the input terminal of the power supply chip. The power chip adjusts the input voltage received by the voltage regulation branch to a second voltage output through the second output branch based on the first voltage, so that the power circuit outputs the first voltage and the second voltage simultaneously, wherein the first voltage and the second voltage may be the same or different.

[0006] As an optional embodiment, each output branch includes a feedback branch connected to the power chip, which is used to send the collected output voltage of the corresponding output branch to the power chip, and the power chip adjusts the first voltage and the second voltage based on the corresponding output voltage.

[0007] As an alternative embodiment, one end of the voltage regulating branch is connected to the output terminal of the power chip, and the voltage value of the first voltage is greater than the voltage value of the second voltage.

[0008] As an optional embodiment, when it is determined that the power chip switches the reference voltage of the second main circuit from the first voltage to a preset voltage, the voltage regulation branch outputs a third voltage through the second output branch, so that the power circuit outputs the first voltage and the third voltage at the same time. The preset voltage is different from the first voltage, the third voltage is different from the second voltage, and the third voltage is the same as or different from the first voltage.

[0009] As an optional embodiment, each of the output branches further includes a voltage divider branch, and the voltage divider branch is provided with a sliding rheostat connected to the power chip. The power chip controls the second output branch to output a fourth voltage by adjusting the sliding rheostat, so that the power circuit outputs the first voltage and the fourth voltage at the same time. The fourth voltage is different from the second voltage, and the fourth voltage is the same as or different from the first voltage.

[0010] As an optional embodiment, each of the output branches further includes a remote sampling branch connected to the power chip. The remote sampling branch is used to acquire the received voltage of the power receiving end and send it to the power chip. The power chip adjusts the corresponding first voltage and second voltage based on the acquired output voltage and the received voltage. The received voltage is less than the output voltage.

[0011] As an optional embodiment, the power chip is a DC-DC converter, which has a first drive interface and a second drive interface, wherein the drive voltage of the first drive interface is different from the drive voltage of the second drive interface. The voltage regulation branch includes an upper switching transistor and a lower switching transistor. The first driving interface is connected to the upper switching transistor. The power chip sends a driving signal to the upper switching transistor through the first driving interface. The second driving interface is connected to the lower switching transistor. The power chip sends a driving signal to the lower switching transistor based on the acquired first voltage and the second driving interface.

[0012] As an optional embodiment, the power supply circuit further includes a driver, the power chip having a second driver interface and a third driver interface, and the driver being connected to the second driver interface and the third driver interface respectively. The voltage regulation branch includes an upper switch and a lower switch. The driver is connected to the upper switch and the lower switch respectively. The power chip controls the driver to send drive signals to the upper switch and the lower switch respectively through the second drive interface and the third drive interface.

[0013] As an optional embodiment, when it is determined that multiple sets of the second main circuit are set, the multiple sets of the second main circuit are set in parallel, and the output voltage of the first set of the second main circuit is the reference voltage of the second set of the second main circuit.

[0014] The purpose of this application embodiment is also to provide an electronic device, including at least two power receiving terminals, and further comprising: The first main circuit includes a power chip and a first output branch. The power chip is electrically connected to the input terminal to convert the received input voltage into a first voltage output through the first output branch. The output terminal of the first output branch is connected to one of the power receiving terminals. At least one set of second main circuits, including a voltage regulating branch and a second output branch, wherein one end of the voltage regulating branch is connected between the input terminal and the input terminal of the power chip, and the output terminal of the second output branch is connected to another power receiving terminal. The power chip adjusts the input voltage received by the voltage regulation branch to a second voltage output through the second output branch based on the first voltage, wherein the first voltage and the second voltage may be the same or different. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural block diagram of the power supply circuit of Embodiment 1 of this application; Figure 2 This is a block diagram of the power supply circuit of Embodiment 2 of this application; Figure 3 This is a structural block diagram of the power supply circuit of Embodiment 3 of this application; Figure 4 This is a structural block diagram of the power supply circuit of Embodiment 4 of this application. Detailed Implementation

[0017] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0018] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0019] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0020] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0021] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application.

[0022] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0023] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0024] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0025] This application provides a power supply circuit, such as... Figure 1 As shown, the power supply circuit includes a first main circuit and at least one set of second main circuits. Specifically, the power supply circuit in this application refers to a circuit in consumer electronics that provides stable voltage to each power receiving terminal (functional module) of the device, enabling simultaneous output of multiple voltage sources.

[0026] The first main circuit includes a power chip and a first output branch. The power chip is electrically connected to the input terminal to convert the received input voltage into a first voltage output through the first output branch.

[0027] The power chip is essentially a DC-DC converter, whose core function is to convert the input voltage at the input terminal into a stable output voltage. It can then be expanded to multiple outputs and the output voltage can be adjusted through external circuits.

[0028] The first output branch is composed of basic components such as wires and filter capacitors, and the output end can be directly connected to one of the power receiving terminals of the electronic device.

[0029] The input terminal is the port through which the power supply circuit receives external power, used to connect an external input voltage (such as 3.7V or 5V) to provide the power supply basis for the entire power supply circuit. The input voltage is the external DC voltage connected through the input terminal.

[0030] The first voltage is a stable DC voltage output by the first output branch after conversion by the power chip in the first main circuit. It is the default single-channel output voltage of the power chip (such as 3.3V or 5V) and can be used as the reference voltage for the second main circuit.

[0031] At least one set of second main circuits is connected in parallel to the first main circuit. The at least one set of second main circuits includes a voltage regulating branch and a second output branch. One end of the voltage regulating branch is connected between the input terminal and the input terminal of the power chip.

[0032] The power chip adjusts the input voltage received by the voltage regulation branch to a second voltage output through the second output branch based on the first voltage, so that the power circuit outputs the first voltage and the second voltage simultaneously, wherein the first voltage and the second voltage may be the same or different.

[0033] The second main circuit is an additional output circuit extended from the first main circuit, with at least one set configured to output a second voltage to power other power receiving terminals of the device, and is connected in parallel with the first main circuit. The input terminals of the second main circuit and the first main circuit are connected accordingly, sharing the external input voltage, and do not interfere with each other's voltage conversion and output.

[0034] One end of the voltage regulation branch can be connected between the input terminal and the input terminal of the power chip (i.e., to obtain the input voltage). The voltage regulation branch adjusts the received voltage to a second voltage according to the control signal received from the power chip.

[0035] The second voltage is a stable DC voltage output by the second output branch after the voltage regulation branch adjusts the received input voltage based on the first voltage (as a reference voltage). It is adapted to the power supply requirements of the non-core power receiving end of the device and can be the same as the first voltage (e.g., two 3.3V power supplies) or different (e.g., one 3.3V and one 1.8V).

[0036] In this embodiment, the external input voltage is connected to the power supply circuit through the input terminal. The input voltage is divided into two paths: one path flows into the power supply chip of the first main path, and the other path flows into at least one set of voltage regulation branches of the second main path.

[0037] The power chip receives the input voltage and converts it into a stable first voltage. The first voltage is output through the first output branch to power one of the devices (such as the core processor).

[0038] The power chip uses the first voltage as a reference voltage and sends a control signal to the voltage regulation branch. After receiving the input voltage and the control signal, the voltage regulation branch adjusts the input voltage to a stable second voltage. The second voltage is output through the second output branch to power another power receiving end of the device (such as a display screen).

[0039] This application achieves multiple independent outputs using a single power chip, reducing the number of chips and lowering costs. The entire power circuit simultaneously outputs a first voltage and a second voltage, enabling multiple power supplies. The first and second voltages can be the same or different, and no additional power chips are required throughout the process; expansion is achieved only through external voltage regulation branches.

[0040] In one embodiment, each output branch includes a feedback branch connected to the power chip, which is used to send the collected output voltage of the corresponding output branch to the power chip, and the power chip adjusts the first voltage and the second voltage based on the corresponding output voltage.

[0041] One end of the feedback branch is connected to the corresponding output branch to collect the actual output voltage of the branch, and the other end is connected to the power chip to send the collected output voltage to the power chip in real time, which serves as the basis for the power chip to adjust the output voltage (first voltage, second voltage, etc.) to ensure voltage stability. The feedback branch has a simple structure, including a sampling resistor and a feedback wire.

[0042] In this embodiment, the feedback branch of each output branch collects the actual output voltage of the corresponding branch in real time and sends the collected voltage signal to the power chip synchronously.

[0043] The power chip compares the received actual output voltage with the preset standard voltage (the standard values ​​of the first voltage and the second voltage). If a deviation occurs (such as the first voltage dropping from 3.3V to 3.2V due to increased load), the power chip immediately adjusts its own voltage conversion logic and adjusts the control signal sent to the voltage regulation branch.

[0044] The voltage regulating branch fine-tunes the output voltage according to the adjusted control signal, and the feedback branch continuously collects and provides feedback until all output voltages are restored to the standard value, thus achieving real-time stable regulation of the output voltage without affecting the normal operation of multiple power supplies.

[0045] This application adds a voltage feedback regulation function to the feedback branch to ensure stable output voltage and solve the voltage deviation problem caused by load changes at the power receiving end of consumer electronics.

[0046] In one embodiment, one end of the voltage regulating branch is connected to the output terminal of the power chip, and the voltage value of the first voltage is greater than the voltage value of the second voltage.

[0047] Among them, the connection position of the voltage regulating branch is adjusted, and the relationship between the first voltage and the second voltage is clarified to adapt to the common requirements of "high voltage at the core power receiving end and low voltage at the non-core power receiving end" in consumer electronics.

[0048] In this embodiment, the external input voltage is connected to the circuit through the input terminal and flows into the power chip of the first main circuit. The power chip converts the input voltage into a first voltage, which is then output through the first output branch. Simultaneously, the feedback branch of the first output branch collects the first voltage and feeds it back to the power chip. One end of the voltage regulation branch is directly connected to the output terminal of the power chip to obtain the first voltage as the input voltage.

[0049] The power chip uses the first voltage as a reference and, in conjunction with the output voltage collected by the feedback branch, sends a control signal to the voltage regulation branch. Since the voltage value of the first voltage is greater than the voltage value of the second voltage, the voltage regulation branch reduces the first voltage to a stable second voltage.

[0050] The second voltage is output through the second output branch, and its feedback branch collects the second voltage and feeds it back to the power chip. The power chip compares and adjusts in real time to ensure that the first voltage (high) and the second voltage (low) are output stably, which is suitable for power supply scenarios such as "processor 3.3V, sensor 1.8V".

[0051] In one embodiment, such as Figures 2-3 As shown, when the power chip switches the reference voltage of the second main circuit from the first voltage to a preset voltage, the voltage regulation branch outputs a third voltage through the second output branch, so that the power circuit outputs the first voltage and the third voltage at the same time. The preset voltage is different from the first voltage, the third voltage is different from the second voltage, and the third voltage is the same as or different from the first voltage.

[0052] The preset voltage is a preset reference voltage that is different from the first voltage. When the power chip switches the reference voltage of the second main circuit from the first voltage to the preset voltage, the voltage regulation branch can output a third voltage that is different from the second voltage.

[0053] Specifically, such as Figure 2 As shown, the preset voltage can be other voltages from the feedback branch of the first main circuit, so that the voltage output of the second main circuit is correlated with the voltage output of the first main circuit, and the two can be synchronously and stably adjusted to ensure that the stability of the two output voltages remains consistent.

[0054] like Figure 3 As shown, the preset voltage can be other voltages from the power chip. The generation of its reference voltage is not affected by changes in the first main circuit load, feedback branch adjustment and external wiring interference, ensuring the independence and stability of the second main circuit output voltage.

[0055] Furthermore, the power chip can integrate multiple fixed or adjustable reference voltages of different specifications, which makes it easy to flexibly configure the output voltage according to the actual power supply requirements of the second main circuit and adapt to the differentiated power supply requirements of different components inside the device (such as CPU, display module, sensors, etc.).

[0056] like Figure 4 As shown, the preset voltage can be any external voltage, which may include the reference voltage of other chips, the system regulated output voltage, the battery voltage divider, the DAC output voltage of the MCU, etc. It can adapt to the voltage requirements of different systems and is not limited by the power chip's own structure and the first main circuit.

[0057] When the external reference voltage changes, the second main circuit can adjust in real time to follow the reference voltage, which can meet the needs of dynamic voltage regulation, dynamic voltage frequency regulation and intelligent power consumption control of the system, and help reduce the overall power consumption of the equipment.

[0058] In this embodiment, when it is detected that the device needs to dynamically adjust the power supply (such as when the smart bracelet switches from normal mode to low power mode, the sensor power supply voltage needs to be reduced), the power chip switches the reference voltage of the second main circuit from the original first voltage to a preset voltage (this preset voltage is different from the first voltage).

[0059] The voltage regulation branch receives the control signal from the power chip and adjusts the input voltage to a third voltage (different from the second voltage) based on the preset voltage as a new reference. The third voltage is output through the second output branch. The feedback branch collects the third voltage and feeds it back to the power chip. The power chip adjusts in real time to ensure that the first voltage (unchanged) and the third voltage (new output) coexist stably, realizing the adaptation of dynamic power supply at the receiving end without the need for additional circuitry.

[0060] This application adds a reference voltage switching function to realize the output of a third voltage, adapting to the dynamic power supply requirements of the receiving end.

[0061] In one embodiment, each of the output branches further includes a voltage divider branch, and the voltage divider branch is provided with a sliding rheostat connected to the power chip. The power chip controls the second output branch to output a fourth voltage by adjusting the sliding rheostat, so that the power circuit outputs the first voltage and the fourth voltage at the same time. The fourth voltage is different from the second voltage, and the fourth voltage is the same as or different from the first voltage.

[0062] The voltage divider branch is a voltage regulation branch that is matched with each output branch. The branch is equipped with a sliding rheostat, which is electrically connected to the power chip. The power chip can change the voltage division ratio of the voltage divider branch by adjusting its resistance value, thereby controlling the output of the fourth voltage of the corresponding output branch to adapt to the fine voltage requirements of the power receiving end (such as adjustable from 1.8V to 3.3V).

[0063] In this embodiment, when the device's power receiving end needs to make a slight adjustment to the voltage (such as the sensor needing 2.0V power instead of the original 1.8V), the power chip sends a control signal to the sliding rheostat on the voltage divider branch to adjust the resistance value of the sliding rheostat.

[0064] When the resistance of the sliding rheostat is changed, the voltage division ratio of the voltage divider branch changes accordingly, thereby controlling the output voltage of the second output branch and switching it from the second voltage to the fourth voltage (which is different from the second voltage).

[0065] The feedback branch collects the fourth voltage and feeds it back to the power chip. The power chip finely adjusts the resistance value of the sliding rheostat to ensure a stable output of the fourth voltage. At the same time, the first voltage of the first output branch is output normally, realizing multi-channel power supply with "one fixed and one adjustable" to meet the compatibility requirements of different power receiving terminals.

[0066] In one embodiment, each of the output branches further includes a remote sampling branch connected to the power chip. The remote sampling branch is used to acquire the received voltage of the power receiving end and send it to the power chip. The power chip adjusts the corresponding first voltage and second voltage based on the acquired output voltage and the received voltage, wherein the received voltage is less than the output voltage.

[0067] The remote sampling branch is an auxiliary branch that is matched with each output branch and is used to collect the actual received voltage of the power receiving end. The received voltage of the power receiving end is obtained and matched with the output voltage collected by the feedback branch so that the power chip can accurately adjust the output voltage.

[0068] The power receiving end is a functional module in an electronic device that requires power (such as a processor, OLED display, or heart rate sensor in a smart bracelet). It is the power supply object of the output branch, and each power receiving end corresponds to one output branch.

[0069] The received voltage is the actual voltage received by the receiving end, which is collected by the remote sampling branch. Due to wire loss and load influence, this voltage is slightly less than the actual output voltage of the output branch. It is an important reference for the power chip to accurately adjust the voltage in order to compensate for wire loss.

[0070] In this embodiment, the remote sampling branch of each output branch simultaneously acquires the received voltage of the corresponding power receiving end (due to wire transmission loss, the received voltage is slightly less than the output voltage of the output branch) and sends the received voltage to the power chip.

[0071] The power chip compares the "output voltage" collected by the feedback branch with the "received voltage" collected by the remote sampling branch and calculates the difference between the two (i.e., the voltage due to wire loss). Based on this difference, the power chip adjusts the output voltage, increasing it by the corresponding difference to ensure that the received voltage at the receiving end exactly reaches the preset standard (e.g., output voltage 3.35V, wire loss 0.05V, received voltage at the receiving end 3.3V). This achieves more precise power supply and avoids abnormal operation at the receiving end due to wire loss.

[0072] This application adds a remote sampling branch to achieve more precise voltage regulation, thereby compensating for wire loss and addressing the wire loss issues caused by the miniaturization of consumer electronics.

[0073] In one embodiment, the power chip is a DC-DC converter, which has a first drive interface and a second drive interface, wherein the drive voltage of the first drive interface is different from the drive voltage of the second drive interface. The voltage regulation branch includes an upper switching transistor and a lower switching transistor. The first driving interface is connected to the upper switching transistor. The power chip sends a driving signal to the upper switching transistor through the first driving interface. The second driving interface is connected to the lower switching transistor. The power chip sends a driving signal to the lower switching transistor based on the acquired first voltage and the second driving interface.

[0074] The first drive interface, the second drive interface, and the third drive interface are signal output interfaces on the power chip, used to send drive signals to the switching transistors of the voltage regulation branch. The first drive interface and the second drive interface have different drive voltages to adapt to the drive requirements of different switching transistors.

[0075] The upper and lower switching transistors are the core switching elements in the voltage regulation branch. They are connected to the drive interface of the power chip, and after receiving the drive signal, they turn on and off, thereby controlling the voltage conversion logic of the voltage regulation branch and working with the power chip to complete the regulation of the output voltage.

[0076] The drive signal is a control signal sent by the power chip to the upper and lower switching transistors through the drive interface. It is used to control the on-time and off-time of the switching transistors, thereby adjusting the output voltage of the voltage regulation branch and ensuring the stability and efficiency of voltage conversion.

[0077] In this embodiment, the external input voltage is connected to the circuit through the input terminal and flows into the power supply chip of the first main circuit and the voltage regulation branch of the second main circuit. The power supply chip converts the input voltage into a first voltage, which is then output through the first output branch.

[0078] Simultaneously, the power chip sends a drive signal to the upper switching transistor via the first drive interface (corresponding to the higher drive voltage), controlling the upper switching transistor to conduct and enabling the voltage regulation branch to obtain the input voltage. Furthermore, based on the output state of the first voltage, the power chip sends a drive signal to the lower switching transistor via the second drive interface (corresponding to the lower drive voltage), controlling the on and off times of the lower switching transistor. The coordinated on and off movements of the upper and lower switching transistors complete the step-down regulation of the input voltage, outputting a second voltage, which is then supplied through the second output branch.

[0079] The power chip continuously adjusts the drive signal through two drive interfaces to ensure the stable operation of the upper and lower switching transistors, thereby maintaining the stability of the second voltage while the first voltage is output normally, adapting to the power supply requirements of devices such as tablet CPUs (high load).

[0080] This application clarifies the driving interface characteristics of the power chip and the specific structure of the voltage regulation branch, enhances circuit feasibility, and adapts to high-load power receiving terminals.

[0081] In one embodiment, the power supply circuit further includes a driver, the power chip has a second driver interface and a third driver interface, and the driver is connected to the second driver interface and the third driver interface respectively.

[0082] The voltage regulation branch includes an upper switch and a lower switch. The driver is connected to the upper switch and the lower switch respectively. The power chip controls the driver to send drive signals to the upper switch and the lower switch respectively through the second drive interface and the third drive interface.

[0083] The driver is an auxiliary control element of the power supply circuit. It receives the control signal from the power chip, amplifies it, and sends it to the upper and lower switching transistors to solve the problem of insufficient driving capability of the power chip and adapt to the power supply requirements of high-load power receiving terminals in consumer electronics.

[0084] In this embodiment, the external input voltage access circuit flows into the power chip and the voltage regulation branch of the second main circuit. The power chip sends the control signal to the driver through the second drive interface (corresponding to the lower drive voltage) and the third drive interface (corresponding to the PWM pin).

[0085] After receiving the control signal from the power chip, the driver amplifies the signal and then sends the amplified drive signal to the upper and lower switching transistors respectively. The upper and lower switching transistors turn on and off according to the drive signal. The voltage regulation branch adjusts the input voltage to the second voltage and outputs it through the second output branch.

[0086] The power chip adjusts the control signal in real time through the second and third drive interfaces. The driver amplifies the signal synchronously and transmits it to ensure that the voltage regulation branch outputs the second voltage stably. At the same time, the first main circuit outputs the first voltage, realizing multi-channel, high-load power supply.

[0087] This application adds a driver to solve the problem of insufficient driving capability of the power chip, and adapts to the scenario of multiple secondary main circuits and high load in consumer electronics.

[0088] In one embodiment, when it is determined that multiple sets of the second main circuit are configured, the multiple sets of the second main circuit are configured in parallel, and the output voltage of the previous set of the second main circuit is the reference voltage of the next set of the second main circuit.

[0089] In this embodiment, the external input voltage is connected to the circuit and flows into the power chip of the first main circuit. The power chip converts the input voltage into a first voltage and outputs it through the first output branch. At the same time, the first voltage serves as the reference voltage for the first group of second main circuits.

[0090] The voltage regulating branch of the first group of second main circuits receives the input voltage, adjusts the output voltage based on the first voltage, and supplies power through its second output branch. Multiple groups of second main circuits are connected in parallel, with the output voltage (e.g., the second voltage) of the previous group of second main circuits serving as the reference voltage for the next group of second main circuits. The voltage regulating branch of the next group of second main circuits receives the input voltage, adjusts the output voltage of the previous group as a reference, and outputs a voltage that is different from (or the same as) that of the previous group.

[0091] The output voltage of all secondary main circuits is simultaneously output with the first voltage of the primary main circuit, enabling multi-channel voltage power supply (such as 1 channel of 5V, 2 channels of 3.3V, and 1 channel of 1.8V), and each group of secondary main circuits does not interfere with each other, adapting to multiple power receiving end scenarios, while using only one power chip, saving costs.

[0092] This application also provides an electronic device, including at least two power receiving terminals, and further comprising: The first main circuit includes a power chip and a first output branch. The power chip is electrically connected to the input terminal to convert the received input voltage into a first voltage output through the first output branch. The output terminal of the first output branch is connected to one of the power receiving terminals. At least one set of second main circuits, including a voltage regulating branch and a second output branch, wherein one end of the voltage regulating branch is connected between the input terminal and the input terminal of the power chip, and the output terminal of the second output branch is connected to another power receiving terminal. The power chip adjusts the input voltage received by the voltage regulation branch to a second voltage output through the second output branch based on the first voltage, wherein the first voltage and the second voltage may be the same or different.

[0093] In this embodiment, the electronic device is a consumer electronic device that uses the above-mentioned power circuit, such as a smart bracelet, Bluetooth headset, tablet, or smartphone. It has at least two power receiving terminals and requires multiple different (or the same) voltage power supplies. The core requirements are low cost, miniaturization, and voltage stability.

[0094] Taking a smart bracelet as an example, the external power supply lithium battery of the smart bracelet is connected to the power circuit through the input terminal. In the first main circuit of the power circuit, the power chip receives the 3.7V input voltage, converts it into a first voltage of 3.3V, and outputs it through the first output branch. Its output terminal is connected to the processor of the smart bracelet to supply power to the processor.

[0095] In at least one set of second main circuits of the power supply circuit, one end of the voltage regulation branch is connected between the input terminal and the power chip to obtain an input voltage of 3.7V. Based on a first voltage of 3.3V, the power chip sends a control signal to the voltage regulation branch, which then adjusts the 3.7V to a second voltage of 1.8V. The output terminal of the second output branch is connected to the OLED display of the smart bracelet, outputting the 1.8V second voltage to power the display.

[0096] The entire power supply circuit simultaneously supplies power to the processor (3.3V) and the display screen (1.8V), enabling the electronic device to operate normally. It uses only a single-channel chip, solving the problems of cumbersome selection and high cost of multiple chips in traditional designs, and adapting to the miniaturization and low-cost requirements of consumer electronics.

[0097] This application eliminates the need for special, customized multi-output power chips. By simply adding voltage regulation and feedback circuits to the periphery of a standard single-output power chip, multi-voltage output can be achieved, reducing material costs. Furthermore, it only requires the use of one single-channel chip, eliminating the need for multiple different output power chips. This significantly reduces the workload of supplier selection and chip selection, avoids being limited by the supply chain or chip models, and adapts to the mass production needs of consumer electronics.

[0098] The foregoing has described in detail several embodiments of this application, but this application is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications based on the concept of this application, and all such variations and modifications should fall within the scope of protection claimed in this application.

Claims

1. A power supply circuit, comprising: The first main circuit includes a power chip and a first output branch. The power chip is electrically connected to the input terminal to convert the received input voltage into a first voltage output through the first output branch. At least one set of second main circuits is connected in parallel to the first main circuit. Each set of second main circuits includes a voltage regulating branch and a second output branch. One end of the voltage regulating branch is connected between the input terminal and the input terminal of the power supply chip. The power chip adjusts the input voltage received by the voltage regulation branch to a second voltage output through the second output branch based on the first voltage, so that the power circuit outputs the first voltage and the second voltage simultaneously, wherein the first voltage and the second voltage may be the same or different.

2. The power supply circuit as described in claim 1, wherein each output branch includes a feedback branch connected to the power supply chip, for sending the collected output voltage of the corresponding output branch to the power supply chip, and the power supply chip adjusts the first voltage and the second voltage based on the corresponding output voltage.

3. The power supply circuit as described in claim 2, or, one end of the voltage regulating branch is connected to the output terminal of the power chip, and the voltage value of the first voltage is greater than the voltage value of the second voltage.

4. In the power supply circuit as described in claim 2, when it is determined that the power chip switches the reference voltage of the second main circuit from the first voltage to a preset voltage, the voltage regulation branch outputs a third voltage through the second output branch, so that the power supply circuit outputs the first voltage and the third voltage simultaneously, wherein the preset voltage is different from the first voltage, the third voltage is different from the second voltage, and the third voltage is the same as or different from the first voltage.

5. The power supply circuit as described in claim 2, wherein each of the output branches further includes a voltage divider branch, and the voltage divider branch is provided with a sliding rheostat connected to the power chip. The power chip controls the second output branch to output a fourth voltage by adjusting the sliding rheostat, so that the power supply circuit outputs the first voltage and the fourth voltage simultaneously. The fourth voltage is different from the second voltage, and the fourth voltage is the same as or different from the first voltage.

6. The power supply circuit as claimed in claim 2, wherein each of the output branches further includes a remote sampling branch connected to the power supply chip, the remote sampling branch being used to acquire the received voltage of the power receiving end and send it to the power supply chip, the power supply chip adjusting the corresponding first voltage and second voltage based on the acquired output voltage and the received voltage, wherein the received voltage is less than the output voltage.

7. The power supply circuit as described in claim 1, wherein the power supply chip is a DC-DC converter, having a first drive interface and a second drive interface, wherein the drive voltage of the first drive interface is different from the drive voltage of the second drive interface; The voltage regulation branch includes an upper switching transistor and a lower switching transistor. The first driving interface is connected to the upper switching transistor. The power chip sends a driving signal to the upper switching transistor through the first driving interface. The second driving interface is connected to the lower switching transistor. The power chip sends a driving signal to the lower switching transistor based on the acquired first voltage and the second driving interface.

8. The power supply circuit as claimed in claim 1, further comprising a driver, the power chip having a second driver interface and a third driver interface, the driver being connected to the second driver interface and the third driver interface respectively. The voltage regulation branch includes an upper switch and a lower switch. The driver is connected to the upper switch and the lower switch respectively. The power chip controls the driver to send drive signals to the upper switch and the lower switch respectively through the second drive interface and the third drive interface.

9. The power supply circuit as described in claim 1, wherein when multiple sets of the second main circuit are determined to be configured, the multiple sets of the second main circuit are configured in parallel, and the output voltage of the previous set of the second main circuit is the reference voltage of the next set of the second main circuit.

10. An electronic device, comprising at least two powered terminals, and further comprising: The first main circuit includes a power chip and a first output branch. The power chip is electrically connected to the input terminal to convert the received input voltage into a first voltage output through the first output branch. The output terminal of the first output branch is connected to one of the power receiving terminals. At least one set of second main circuits, including a voltage regulating branch and a second output branch, wherein one end of the voltage regulating branch is connected between the input terminal and the input terminal of the power chip, and the output terminal of the second output branch is connected to another power receiving terminal. The power chip adjusts the input voltage received by the voltage regulation branch to a second voltage output through the second output branch based on the first voltage, wherein the first voltage and the second voltage may be the same or different.

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