CN111026257A

CN111026257A - Power supply circuit and electronic device

Info

Publication number: CN111026257A
Application number: CN201911175982.7A
Authority: CN
Inventors: 丁永波; 宋长春
Original assignee: Shenzhen Weibu Information Co Ltd
Current assignee: Shenzhen Weibu Information Co Ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-04-17
Anticipated expiration: 2039-11-26
Also published as: CN111026257B

Abstract

The invention provides a power supply circuit for outputting a CPU VICCO signal and an electronic device. The power supply circuit comprises a main control circuit, a time sequence control circuit, a compensation circuit, a feedback output circuit and a VICCO signal end, wherein a MOSFET circuit, an overvoltage protection circuit and an overcurrent protection circuit are integrated in the main control circuit, the main control circuit comprises an input end, an enabling end, an output end, a self-boosting end and a feedback end, the input end is used for receiving input signals, the output end is used for outputting output signals obtained by converting the input signals by the main control circuit, the output end is further connected to the VICCO signal end, the enabling end is connected with the time sequence control circuit, the self-boosting end is connected to the output end through an auxiliary circuit, the auxiliary circuit comprises a resistor and a capacitor which are connected in series, the feedback end is connected to the output end through the feedback output circuit, and the compensation circuit is connected between the output end and the feedback end.

Description

Power supply circuit and electronic device

Technical Field

The present disclosure relates to power supply technologies, and particularly to a power supply circuit and an electronic device.

Background

The global coverage of 3G makes the world rapidly step into the mobile internet era, the application range of 4G networks becomes wider, 2019, the 5G era is coming, and people's daily work, life and networks become more and more compact. Various electronic devices rapidly permeate the market, and are a strong driving force for the development of mobile internet. Under such circumstances, various electronic devices are receiving attention from more and more users, and among them, various electronic devices such as Personal Computers (PCs), notebook computers, tablet computers, and smart phones are popular with consumers.

However, in various electronic devices, the power supply is the heart of the electronic device, the power supply module of the motherboard is the heart of the motherboard, and especially the power supply of the Central Processing Unit (CPU) is the core of the whole power supply module, which determines whether the CPU mounted on the body can work normally, and further determines whether the CPU can exert complete performance, and therefore, whether the power supply of the motherboard is stable enough is always needed to be determined, and the stability of the electronic device is directly affected by the quality of the power supply performance of the CPU. Therefore, the main board power supply design is an important link in the design of electronic devices, and how to design a power supply circuit with at least one of the advantages of stable performance, simple wiring and low cost is one direction for designers to research.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a power supply circuit for outputting a CPU VCCIO voltage and an electronic device using the power supply circuit.

One embodiment of the invention provides a power supply circuit, which comprises a main control circuit, a time sequence control circuit, a compensation circuit, a feedback output circuit and a VICCO signal end, wherein a MOSFET circuit, an overvoltage protection circuit and an overcurrent protection circuit are integrated in the main control circuit, the main control circuit comprises an input end, an enable end, an output end, a self-boosting end and a feedback end, the input end is used for receiving an input signal, the output end is used for outputting an output signal obtained by converting the input signal by the main control circuit, the output end is also connected to the VICCO signal end, the enable end is connected with the time sequence control circuit to enable the time sequence control circuit to control the power-on time sequence of the main control circuit, the self-boosting end is connected to the output end through an auxiliary circuit, the auxiliary circuit comprises a resistor and a capacitor which are connected in series, and the feedback end is connected to the output end through the feedback, the compensation circuit is connected between the output end and the feedback end.

In one embodiment, the power supply circuit further comprises an input voltage stabilization line, the input terminal is further grounded via the input voltage stabilization line, and the input voltage stabilization line comprises a chip multilayer ceramic capacitor.

In one embodiment, the power supply circuit further comprises an output voltage stabilizing line, the VICCO signal terminal is further grounded via the output voltage stabilizing line, and the output voltage stabilizing line comprises a chip type multilayer ceramic capacitor.

In one embodiment, the power supply circuit further includes an output current stabilizing circuit, the output end of the main control circuit is connected to the VICCO signal end via the output current stabilizing circuit, and the output current stabilizing circuit includes an output inductor.

In one embodiment, the feedback output line includes a first voltage-dividing resistor and a second voltage-dividing resistor, the VCCIO signal terminal is grounded via the first voltage-dividing resistor and the second voltage-dividing resistor in sequence, and the feedback terminal is connected to a node between the first voltage-dividing resistor and the second voltage-dividing resistor.

In one embodiment, the compensation circuit includes a first compensation resistor, a second compensation resistor, and a compensation capacitor, one end of the first compensation resistor is connected to the feedback terminal, and the other end of the first compensation resistor is connected to the output terminal via the first compensation resistor on the one hand, and is connected to one end of the output current stabilization circuit adjacent to the VICCO signal terminal via the compensation capacitor on the other hand.

In one embodiment, the enable terminal is further connected to an operating voltage output terminal for receiving an operating voltage, the timing control circuit includes a first voltage input terminal, a second voltage input terminal, a first transistor, a second transistor, a first resistor, a second resistor, and a first capacitor, the first voltage input terminal is configured to receive a first voltage, the first voltage input terminal is sequentially grounded via the first resistor and the first capacitor, a first conducting terminal of the first transistor is connected to a node between the first resistor and the first capacitor, a second conducting terminal of the first transistor is grounded, a control terminal of the first transistor is further connected to a control terminal of the second transistor, a first conducting terminal of the second transistor is connected to the enable terminal, a second conducting terminal of the second transistor is grounded, and the second voltage input terminal is configured to receive a second voltage, the second voltage input terminal is connected to a node between the control terminal of the first transistor and the control terminal of the second transistor via the second resistor.

In one embodiment, the timing control circuit further comprises a second capacitor, and a node between the control terminal of the first transistor and the control terminal of the second transistor is further grounded via the second capacitor.

In one embodiment, the main control circuit further includes a power supply ready end and a driving end, the driving end receives a working voltage through a first connecting resistor, the power supply ready end is connected to the driving end through a second connecting resistor, and the driving end is further grounded through an energy storage capacitor.

An electronic device, wherein the electronic device adopts the power supply circuit of any one of the above embodiments.

In the electronic device, as can be seen from the above, in the power supply circuit, the internal integration of the main control circuit is higher, such as an integrated MOSFET circuit, an overvoltage protection circuit, an overcurrent protection circuit and the like, so that the peripheral wiring of the main control circuit is simplified, the Layout difficulty and the cost can be reduced, and the time spent by an engineer during debug is reduced; in addition, the peripheral wiring of the main control circuit is simplified, the number of parts is reduced, so that the occupied space of a PCB is correspondingly small, and the cost can be better controlled; and moreover, the number and the types of peripheral wiring parts are reduced, so that the production in a factory is facilitated.

Furthermore, in the above embodiment, on the basis of simplification, low cost, high working efficiency and stable performance, the power supply circuit still has the functions of overvoltage protection, overcurrent protection, compensation circuit capable of realizing loop dynamic rapid compensation mechanism, input and output voltage stabilization, output current stabilization and the like, especially, the input current stabilization is not needed, the input and output voltage stabilization circuit is not needed, the application circuit is simple, and the number of parts, the cost, the wiring and the occupied space of the PCB are effectively reduced. Furthermore, the power supply circuit is widely applied and can be applied to various electronic devices, the power supply circuit is directly designed into various electronic device products, the circuit has universality and universality, and related devices in the circuit are common materials in the industry, so that the purchase is convenient.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a power supply circuit for outputting a CPU VICCO voltage of an electronic device according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a power supply circuit for outputting a CPU VICCO voltage of an electronic device according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," and "third," etc. in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprises" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The electronic device according to the present invention may be a tablet Computer, a mobile phone, an electronic reader, a remote controller, a Personal Computer (PC, including a desktop Computer, an all-in-one Computer, etc.), a notebook Computer, a vehicle-mounted device, a flat panel display, a flat panel television, a wearable device, etc., and is not limited thereto.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply circuit 10 of an electronic device for outputting a CPU VICCO voltage according to an embodiment. The power supply circuit 10 comprises a main control circuit 11, a time sequence control circuit 12, an OCP protection circuit 13, a compensation circuit 14, a feedback output circuit 15, an auxiliary circuit 16, a first field effect transistor 17, a second field effect transistor 18, an input voltage stabilizing circuit 19, an output voltage stabilizing circuit 20, an input current stabilizing circuit 21, an output current stabilizing circuit 22 and a VICCO signal terminal 23. The main control circuit 11 is a main control chip and includes a power supply terminal VCC, a boost terminal BOOT, a first transistor control terminal UGATE, a second transistor control terminal LGATE, a PHASE voltage terminal PHASE, a ground terminal GND, a GND _ PAD, a feedback terminal FB, and an overcurrent setting terminal OCSET.

The power supply terminal VCC is connected to the first input voltage terminal 101 via the first resistor 101 to receive an input voltage, and is also grounded via the first capacitor 102. The input voltage may be a 12V and 5A dc voltage. The boost terminal BOOT is connected to the PHASE voltage terminal PHASE via the auxiliary line 16, and the auxiliary line 16 includes a second resistor 161 and a second capacitor 162 connected in series. The main control circuit 11 may further include an enable terminal EN1, a MODE setting terminal MODE, and other functional terminals OTW #, VTT, VTTs, VTTREF, the enable terminal EN1 and the MODE setting terminal MODE may be grounded, and the other functional terminals OTW #, VTT, VTTs, VTTREF may be suspended.

The first transistor control terminal UGATE is connected to the gate of the first field effect transistor 17 via a third resistor 171. The second transistor control terminal LGATE is connected to the gate of the second field effect transistor 18 via a fourth resistor 181, the second transistor control terminal UGATE is also connected to ground via the OCP protection line 13, and the OCP protection line 13 includes a protection resistor 131. The source of the first field effect transistor 17 is also connected to the first voltage input 101 via the input regulation line 21 to receive the input voltage, the source of the first field effect transistor 17 is also connected to ground via the input regulation line 19, and the drain of the first field effect transistor 17 is also connected to the PHASE voltage terminal PHASE. The source of the second field effect transistor 18 is connected to the drain of the first field effect transistor 17, the drain of the second field effect transistor 18 is grounded, and the gate of the second field effect transistor 18 is also grounded via a third capacitor 182. The node between the drain of the first field effect transistor 17 and the source of the second field effect transistor 18 is also connected to the VICCO signal terminal 23 via the output current stabilization line 22. The VICCO signal terminal 23 is also connected to ground via the output regulator line 20.

The feedback output circuit 15 includes a first voltage-dividing resistor 151 and a second voltage-dividing resistor 152, the VICCO signal terminal 23 is sequentially grounded via the first voltage-dividing resistor 151 and the second voltage-dividing resistor 152, and the feedback terminal FB is connected to a node between the first voltage-dividing resistor 151 and the second voltage-dividing resistor 152. The over current setting terminal OCSET is connected to the timing control line 12 for receiving a VCCIO enable signal, where the VCCIO enable signal is used for controlling the power-on timing of the power supply circuit 10, and the over current setting terminal OCSET is further connected to the compensation line 14. The compensation circuit 14 includes a fifth resistor 141, a fourth capacitor 142, and a fifth capacitor 143, and the over-current setting terminal OCSET is sequentially grounded through the fifth resistor 141 and the fourth capacitor 142, and is grounded through the fifth capacitor 143. The timing control circuit 12 is further connected to the second input voltage terminal 102 for receiving a voltage signal of 5V, and to the third input voltage terminal 103 for receiving a voltage signal of 1.2V.

When the power supply circuit 10 works, the power supply terminal VCC of the main control circuit 11 receives an input signal, the voltage of the input signal is 12V, the current is 5A, the timing control circuit 12 outputs a VCCIO enable signal to the overcurrent setting terminal OCSET, the main control circuit 11 converts the input signal into an output signal and outputs the output signal through the PHASE voltage terminal PHASE, and the boost terminal BOOT, the auxiliary circuit 16, the first transistor control terminal UGATE and the second transistor control terminal LGATE control the switching timing of the first field effect transistor 17 and the second field effect transistor 18, so that the signal voltage of the VICCO signal terminal 23 is 1.05V, and the current is 12A.

The feedback output circuit 15 further detects the signal of the VICCO signal terminal 23 and feeds the signal back to the main control circuit 11, so that the main control circuit 11 adjusts the signals of the PHASE voltage terminal PHASE, the first and second transistor control terminals UGATE and LGATE to adjust the signal of the VICCO signal terminal 23. Furthermore, it can be understood that by setting the resistances of the first voltage-dividing resistor 151 and the second voltage-dividing resistor 152 of the feedback output line 15, the signal voltage of the VICCO signal terminal 23 can be set; the OCP protection circuit 13 sets the output power consumption and current by setting the resistance of the protection resistor 131; the compensation circuit 14 can quickly compensate the power supply loop, so that the power supply circuit 10 works in a stable state; the input voltage stabilizing circuit 19 and the output voltage stabilizing circuit 20 are used for stabilizing voltage, and the input voltage stabilizing circuit and the output voltage stabilizing circuit 20 both comprise a chip multilayer ceramic capacitor (MLCC) and a solid capacitor; the input and output

current stabilization lines

21, 22 are for current stabilization and both include an inductor.

However, in the power supply circuit 10, the wiring on the periphery of the main control circuit 11 is complicated, and an engineer needs to spend a lot of time in debug; in addition, the power supply circuit 10 needs the main control circuit 11, the input steady-current circuit 21, the input voltage stabilizing circuit 19 with the solid-state capacitor, the output voltage stabilizing circuit 20, the input steady-current circuit 22, the first and second

field effect transistors

17 and 18, and has a large number of parts, and because the main control circuit 11, the input steady-current circuit 21, the solid-state capacitor, the first and second

field effect transistors

17 and 18, and the like have large sizes, the occupied PCB space is also increased, and therefore, the cost pressure is great; in addition, the power supply circuit 10 is inconvenient for factory production due to the increase in the number and types of parts, and further improvement is required.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a power supply circuit 30 for outputting a CPU VICCO voltage of an electronic device according to another embodiment of the present invention. The power supply circuit 30 includes a main control circuit 31, a timing control circuit 32, an input voltage stabilizing circuit 33, a compensation circuit 34, a feedback output circuit 35, an output voltage stabilizing circuit 36, an output current stabilizing circuit 37, and a VICCO signal terminal 38.

The main control circuit is a 31 main control chip, and a MOSFET circuit, an overvoltage protection circuit and an overcurrent protection circuit are integrated in the main control circuit, and the main control circuit comprises an input end VIN, an enabling end EN2, an output end SW, a self-boosting end BST, a feedback end FB, a power supply ready end PG and a driving end 3V 3. Wherein the internally integrated MOSFET circuit may comprise a first field effect transistor 17 and a second field effect transistor 18 structured as shown in fig. 1.

The input terminal VIN is configured to be connected to a first input voltage terminal 301 for receiving an input signal, the output terminal SW is configured to output an output signal obtained by converting the input signal by the main control circuit 31, and the output terminal SW is further connected to the VICCO signal terminal 38. The input terminal VIN is also grounded via the input voltage stabilization line 33, and the input voltage stabilization line 33 includes a chip multilayer ceramic capacitor. The output end SW is connected to the VICCO signal end 38 via the output current stabilizing line 37, the output current stabilizing line 37 includes an output inductor, the VICCO signal end 38 is also grounded via the output voltage stabilizing line 36, and the output voltage stabilizing line 36 includes a chip multilayer ceramic capacitor.

The enable terminal EN1 is connected to the timing control circuit 12, so that the timing control circuit 12 controls the power-on timing of the main control circuit 11, and the enable terminal EN1 is further connected to a working voltage output terminal 322 for receiving a working voltage. The driving terminal 3V3 receives a working voltage through a first connecting resistor 311, the power ready terminal PG is connected to the driving terminal 3V3 through a second connecting resistor 312, and the driving terminal 3V3 is further grounded through an energy storage capacitor. In addition, the enable terminal EN1 may be connected to the operating voltage output terminal 322 via a third connecting resistor 313.

The self-boosting terminal BST is connected to the output terminal SW through an auxiliary line 39, the auxiliary line 39 includes a resistor 391 and a capacitor 392 connected in series, the feedback terminal FB is connected to the VCCIO signal terminal 38 through the feedback output line 35, and the compensation line 34 is connected between the output terminal SW and the feedback terminal FB.

The feedback output line 35 includes a first voltage-dividing resistor 351 and a second voltage-dividing resistor 352, the VCCIO signal terminal 38 is sequentially grounded via the first voltage-dividing resistor 351 and the second voltage-dividing resistor 352, and the feedback terminal FB is connected to a node between the first voltage-dividing resistor 351 and the second voltage-dividing resistor 352.

The compensation circuit 34 includes a first compensation resistor 341, a second compensation resistor 342, and a compensation capacitor 343, wherein one end of the first compensation resistor 341 is connected to the feedback terminal FB, and the other end of the first compensation resistor 341 is connected to the output terminal SW through the second compensation resistor 342 on the one hand, and is connected to one end of the output current stabilizing circuit 37 adjacent to the VICCO signal terminal 38 through the compensation capacitor 343 on the other hand.

The timing control circuit 32 includes a first voltage input terminal 321, a second voltage input terminal 322, a first transistor 323, a second transistor 324, a first resistor 325, a second resistor 326, a first capacitor 327, and a second capacitor 328, wherein the first voltage input terminal 321 is configured to receive a first voltage, and the first voltage may be 1.2V. The first voltage input terminal 321 is sequentially grounded via the first resistor 325 and the first capacitor 327, a first conduction terminal of the first transistor 323 is connected to a node between the first resistor 325 and the first capacitor 327, a second conduction terminal of the first transistor 323 is grounded, the control terminal of the first transistor 323 is further connected to the control terminal of the second transistor 324, the first conduction terminal of the second transistor 324 is connected to the enable terminal EN1, the second conduction terminal of the second transistor 324 is grounded, the second voltage input terminal 322 is configured to receive a second voltage, and the second voltage may be 5V. The second voltage input terminal 322 is connected to a node between the control terminal of the first transistor 323 and the control terminal of the second transistor 324 via the second resistor 326, and the node between the control terminal of the first transistor 323 and the control terminal of the second transistor 323 is also connected to ground via the second capacitor 328. Wherein, in other embodiments, the second capacitor 328 may be omitted.

When the power supply circuit 30 works, the power supply end VIN of the main control circuit 31 receives an input signal, the voltage of the input signal is 12V, the current is 5A, the timing control circuit 12 outputs a VCCIO enable signal to the enable end EN1, the enable end EN1 further receives the working voltage, the working voltage is 3.3V, the main control circuit 31 converts the input signal into an output signal and outputs the output signal through the output end SW, and under the cooperative control of the self-boosting end BST and the auxiliary circuit 39, the output signal of the output end SW is provided to the VICCO signal end through the output current stabilizing circuit 37, so that the signal voltage of the VICCO signal end 38 is 1.05V, and the current is 12A.

The feedback output line 35 also detects the signal of the VICCO signal terminal 38 and feeds the signal back to the main control circuit 31, so that the main control circuit 31 adjusts the signal of the output terminal SW to adjust the signal of the VICCO signal terminal 38. Furthermore, it can be understood that by setting the resistances of the first voltage-dividing resistor 351 and the second voltage-dividing resistor 352 of the feedback output line 35, the signal voltage of the VICCO signal terminal 38 can be set; the compensation circuit 34 can quickly compensate the power supply loop, so that the power supply circuit 30 works in a stable state; the input voltage stabilizing circuit 33 and the output voltage stabilizing circuit 36 are used for stabilizing voltage, and the input voltage stabilizing circuit 33 and the output voltage stabilizing circuit 36 both comprise a chip type multilayer ceramic capacitor; the output ballast line 37 is used for ballast.

As can be seen from the above, in the power supply circuit 30, the internal integration of the main control circuit 31 is high, such as an integrated MOSFET circuit, an overvoltage protection circuit, an overcurrent protection circuit, and the like, so that the peripheral wiring of the main control circuit 31 is simplified, which not only can reduce the difficulty and cost of Layout, but also reduce the time required by an engineer during debug; in addition, as the peripheral wiring of the main control circuit 31 is simplified, the number of parts is reduced, the occupied space of the PCB is correspondingly less, and the cost can be better controlled; and moreover, the number and the types of peripheral wiring parts are reduced, so that the production in a factory is facilitated.

Further, on the basis of simplification, lower cost, high working efficiency and stable performance, the power supply circuit 30 still has the functions of overvoltage protection, overcurrent protection, a compensation circuit capable of realizing a loop dynamic rapid compensation mechanism, input and output voltage stabilization, output current stabilization and the like, particularly, the input current stabilization is not needed, the input and output voltage stabilization circuit is not needed, a solid capacitor is not needed, an application circuit is simple, and the number of parts, the cost, the wiring and the occupied space of a PCB are effectively reduced.

Furthermore, the power supply circuit 30 is widely applied to various electronic devices, and the power supply circuit 30 is directly designed into various electronic device products, and the circuit has universality and universality, and related devices in the circuit are common materials in the industry, so that the purchase is convenient.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power supply circuit comprises a main control circuit, a time sequence control circuit, a compensation circuit, a feedback output circuit and a VICCO signal end, and is characterized in that: the internal integration of master control circuit has MOSFET circuit, overvoltage protection circuit and overcurrent protection circuit, and it includes input, enable end, output, from the end of boosting and feedback end, the input is used for receiving input signal, the output is used for exporting the output signal that master control circuit will input signal conversion obtains, the output still is connected to VICCO signal end, enable end connection the sequential control circuit makes sequential control circuit control the last electric time sequence of master control circuit, from the end of boosting is connected to the output via auxiliary line, auxiliary line includes serial connection's resistance and electric capacity, the feedback end warp feedback output circuit is connected to the output, compensation circuit connect in the output reaches between the feedback end.

2. The power supply circuit of claim 1, wherein: the power supply circuit further comprises an input voltage stabilizing circuit, the input end is grounded through the input voltage stabilizing circuit, and the input voltage stabilizing circuit comprises a chip type multilayer ceramic capacitor.

3. The power supply circuit of claim 1, wherein: the power supply circuit further comprises an output voltage stabilizing circuit, the VICCO signal end is grounded through the output voltage stabilizing circuit, and the output voltage stabilizing circuit comprises a chip type multilayer ceramic capacitor.

4. The power supply circuit of claim 1, wherein: the power supply circuit further comprises an output current stabilizing circuit, the output end of the main control circuit is connected with the VICCO signal end through the output current stabilizing circuit, and the output current stabilizing circuit comprises an output inductor.

5. The power supply circuit of claim 4, wherein: the feedback output circuit comprises a first voltage-dividing resistor and a second voltage-dividing resistor, the VCCIO signal end is grounded through the first voltage-dividing resistor and the second voltage-dividing resistor in sequence, and the feedback end is connected with a node between the first voltage-dividing resistor and the second voltage-dividing resistor.

6. The power supply circuit of claim 5, wherein: the compensation circuit comprises a first compensation resistor, a second compensation resistor and a compensation capacitor, one end of the first compensation resistor is connected with the feedback end, and the other end of the first compensation resistor is connected with the output end through the first compensation resistor on one hand, and is connected to one end, close to the VICCO signal end, of the output current stabilizing circuit through the compensation capacitor on the other hand.

7. The power supply circuit of claim 1, wherein: the enabling end is further connected with a working voltage output end and used for receiving working voltage, the sequential control circuit comprises a first voltage input end, a second voltage input end, a first transistor, a second transistor, a first resistor, a second resistor and a first capacitor, the first voltage input end is used for receiving first voltage, the first voltage input end is sequentially grounded through the first resistor and the first capacitor, a first conduction end of the first transistor is connected with a node between the first resistor and the first capacitor, a second conduction end of the first transistor is grounded, a control end of the first transistor is further connected with a control end of the second transistor, a first conduction end of the second transistor is connected with the enabling end, a second conduction end of the second transistor is grounded, and the second voltage input end is used for receiving second voltage, the second voltage input terminal is connected to a node between the control terminal of the first transistor and the control terminal of the second transistor via the second resistor.

8. The power supply circuit of claim 7, wherein: the timing control circuit further comprises a second capacitor, and a node between the control end of the first transistor and the control end of the second transistor is further grounded through the second capacitor.

9. The power supply circuit of claim 1, wherein: the main control circuit further comprises a power supply ready end and a driving end, the driving end receives working voltage through a first connecting resistor, the power supply ready end is connected with the driving end through a second connecting resistor, and the driving end is grounded through an energy storage capacitor.

10. An electronic device, characterized in that: the electronic device comprises a power supply circuit as claimed in any one of claims 1-9.