CN216929876U - Power supply circuit and electronic device - Google Patents

Abstract

The utility model discloses a power supply circuit and electronic equipment. The power supply circuit comprises: a voltage conversion circuit, an input end of the voltage conversion circuit is connected with a power supply; a first gating circuit, one end of the first gating circuit is connected with the voltage conversion circuit The output end is connected to the output end of the first gating circuit, and the other end of the first gating circuit is connected to the battery; the second gating circuit, one end of the second gating circuit is connected to the output end of the voltage conversion circuit through an inductance, and the other end of the second gating circuit is connected to the battery. connected, and one end of the second gating circuit is also connected to the load; the control circuit is used to control the power supply to fast charge the battery through the voltage conversion circuit when the first gating circuit is in a conducting state; when the second gating circuit is in In the on state, the power supply is controlled to pre-charge or constant-voltage charge the battery through the voltage conversion circuit, or control the battery to supply power to the load. As a result, fast charging and pre-charging or constant-voltage charging can be realized through component reuse, which reduces the layout area and cost.

Description

Power circuits and electronic equipment

technical field

The utility model relates to the technical field of power supply, in particular to a power supply circuit and electronic equipment.

Background technique

In the traditional fast charging scheme, considering the improvement of charging efficiency, a charge pump is usually used to realize fast charging, but the charge pump is an open-loop charging system and cannot complete the pre-charging and constant-voltage charging during the battery charging process. An additional Buck Charger needs to be added to complete these two processes, which makes the complete battery charging process need two chips to achieve, with many components, large layout area and high cost.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the first objective of the present invention is to provide a power supply circuit, which can realize fast charging and pre-charging or constant-voltage charging through component multiplexing, which reduces the use of components, and reduces the layout area and cost.

The second purpose of the present invention is to provide an electronic device.

In order to achieve the above purpose, a first aspect embodiment of the present utility model proposes a power supply circuit, comprising: a voltage conversion circuit, an input end of the voltage conversion circuit is connected to a power supply; a first gating circuit, one end of the first gating circuit It is connected with the output end of the voltage conversion circuit, and the other end of the first gating circuit is connected with the battery; in the second gating circuit, one end of the second gating circuit is connected with the output end of the voltage converting circuit through an inductance, and the second gating circuit is connected with the output end of the voltage conversion circuit. The other end of the second gating circuit is connected to the battery, and one end of the second gating circuit is also connected to the load; the control circuit, the control circuit is respectively connected to the voltage conversion circuit, the first gating circuit and the second gating circuit, and the control circuit is used for, when the first When the first gating circuit is in the conducting state, the power supply is controlled to quickly charge the battery through the voltage conversion circuit; when the second gating circuit is in the conducting state, the power supply is controlled to pre-charge or constant-voltage charge the battery through the voltage conversion circuit, Or control the battery to supply power to the load.

According to the power supply circuit of the present invention, the charge pump function and the step-down charging function can be realized in the same circuit by sharing the voltage conversion circuit and through the cooperation of the first gating circuit and the second gating circuit, so as to realize the function of charging through the components. It can realize fast charging and precharging or constant voltage charging, which reduces the use of components, and reduces the layout area and cost.

In order to achieve the above objective, an embodiment of the second aspect of the present invention provides an electronic device, including the aforementioned power supply circuit.

According to the electronic device of the present utility model, through the aforementioned power supply circuit, through the common voltage conversion circuit, and through the cooperation of the first gating circuit and the second gating circuit, the charge pump and step-down functions can be realized in the same circuit, thereby Fast charging and precharging or constant voltage charging can be achieved through component reuse, which reduces the use of components, and reduces the layout area and cost.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will become apparent from the following description, or may be learned by practice of the invention.

Description of drawings

1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention;

2 is a circuit diagram of a power supply circuit according to an embodiment of the present invention;

3 is a circuit diagram of a power supply circuit according to another embodiment of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention.

The power supply circuit and the electronic device provided by the embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention. Referring to FIG. 1 , the power supply circuit 100 includes a voltage conversion circuit 110 , a first gating circuit 120 , a second gating circuit 130 and a control circuit 140 .

The input end of the voltage conversion circuit 110 is connected to the power supply; one end of the first gating circuit 120 is connected to the output end of the voltage conversion circuit 110, and the other end of the first gating circuit 120 is connected to the battery; the second gating circuit 120 is connected to the battery; One end of the 130 is connected to the output end of the voltage conversion circuit 110 through the inductor L, the other end of the second gating circuit 130 is connected to the battery, and one end of the second gating circuit 130 is also connected to the load.

The control circuit 140 is respectively connected with the voltage conversion circuit 110, the first gating circuit 120 and the second gating circuit 130, and the control circuit 140 is used for, when the first gating circuit 120 is in a conducting state, to control the power supply through the voltage conversion The circuit 110 charges the battery quickly; when the second gating circuit 130 is in an on state, it controls the power supply to precharge or constant voltage charge the battery through the voltage conversion circuit 110 , or controls the battery to supply power to the load.

Specifically, the circuit shown in FIG. 1 can have a charge pump function, a step-down charging function, and a discharging function. Among them, the charge pump function refers to the use of capacitor energy storage for DC-DC voltage conversion; the step-down charging function refers to the use of inductive energy storage for DC-DC voltage conversion and the output voltage is lower than the input voltage; the discharge function refers to the battery external discharge.

The charge pump function can be implemented by the voltage conversion circuit 110 and the first gating circuit 120 . Based on the charging requirement, when the battery needs to be quickly charged with high power, the control circuit 140 can control the first gating circuit 120 to be in an on state, and the second gating circuit 130 to be in an off state. At this time, the voltage provided by the power supply is After the voltage conversion circuit 110 is converted, it directly enters the battery through the first gating circuit 120 to charge the battery, the loss of the entire charging circuit is reduced to a minimum, and the charging efficiency is high.

The step-down charging function can be implemented by the voltage conversion circuit 110 , the inductor L and the second gating circuit 130 . Based on the charging requirement, when the battery needs to be precharged or charged at a constant voltage, the control circuit 140 can control the second gating circuit 130 to be in an on state, and the first gating circuit 120 to be in an off state, and the power provided by the power supply The voltage is charged and discharged to the inductor L through the voltage conversion circuit 110 to realize voltage conversion, and then enters the battery through the second gating circuit 130 to charge the battery. It should be noted that, since the inductor L is also connected to the load, the load can also be powered during the charging of the battery.

The discharge function may be implemented by the second gating circuit 130 . Based on the discharge requirement, when the battery is required to supply power to the load, the control circuit 140 can control the second gating circuit 130 to be in an on state, the first gating circuit 120 to be in an off state, and the voltage conversion circuit 150 to be inactive. The voltage directly enters the load through the second gating circuit 130 and does not pass through the inductor L, which not only realizes the power supply of the battery to the load, but also reduces the circuit loss to a minimum, and has high discharge efficiency.

In the above embodiment, the charge pump function and the step-down charging function can be realized in the same circuit by sharing the voltage conversion circuit and through the cooperation of the first gating circuit and the second gating circuit, so that the multiplexing of components can be realized. Fast charging and pre-charging or constant-voltage charging reduce the use of components, layout area and cost.

In some embodiments, as shown in FIG. 2 , the voltage conversion circuit 110 includes: a first switch Q1 , a second switch Q2 , a third switch Q3 and a fourth switch Q4 , wherein the first terminal of the first switch Q1 is connected to the voltage The input end of the conversion circuit 110 is connected (that is, connected to the power supply), the control end of the first switch Q1 is connected to the control circuit 140; the first end of the second switch Q2 is connected to the second end of the first switch Q1, the second end The control terminal of the switch Q2 is connected to the control circuit 140; the first terminal of the third switch Q3 is connected to the second terminal of the second switch Q2 and then connected to the output terminal of the voltage conversion circuit 110 (that is, to the first gating circuit 120 respectively). connected to the inductor L), the control terminal of the third switch Q3 is connected to the control circuit 140; the first terminal of the fourth switch Q4 is connected to the second terminal of the third switch Q3, the second terminal of the fourth switch Q4 is grounded to GND, and the first terminal of the fourth switch Q4 is connected to the second terminal of the third switch Q3. The control terminals of the four switches Q4 are connected to the control circuit 140 .

Further, as shown in FIG. 2 , the first end of the second switch Q2 is connected to the second end of the first switch Q1 and is also connected to one end of the first capacitor C1, and the first end of the fourth switch Q4 is connected to the third end of the first capacitor C1. After the second end of the switch Q3 is connected, it is also connected to the other end of the first capacitor C1.

It should be noted that the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 may all be P-type MOS transistors, and when they are P-type MOS transistors, the first ends of each switch are all drains pole, the second terminal is the source, and the control terminal is the gate.

Referring to Fig. 2, when high-power fast charging of the battery is required, the first switch Q1 and the third switch Q3 are used as a group to realize synchronous on-off, and the second switch Q2 and the fourth switch Q4 are used as a group to realize synchronous on-off. , the two sets of switches are complementarily turned on, and at the same time, the charge pump function is realized by using the energy storage function of the first capacitor C1 , and the battery is charged through the first gating circuit 120 .

Specifically, set the duty cycle of the switch as D, when 0<t<D*T (t is the real-time time, T is the switching cycle of the switch), the first switch Q1 and the third switch Q3 are turned on, and the second switch Q1 is turned on, and the second switch is turned on. The switch Q2 and the fourth switch Q4 are turned off. At this time, the first capacitor C1 is charged for energy storage, and the battery is charged through the first gating circuit 120; when D*T<t<T, the first switch Q1 and the first The three switches Q3 are turned off, and the second switch Q2 and the fourth switch Q4 are turned on. At this time, the first capacitor C1 is discharged and the battery is charged through the first gating circuit 120 . It should be noted that, in order to obtain the best charge transfer efficiency, the duty cycle D can be set to 50%. At this time, the ratio of the output voltage of the power supply circuit 100 to the voltage provided by the power supply is 1/2, achieving a 1/2 charge pump function.

When the battery needs to be pre-charged or constant-voltage charged, the first switch Q1 , the second switch Q2 , the third switch Q3 and the fourth switch Q4 can be controlled on and off, and the second gating circuit 130 can be used to control the battery Charge.

As an example, the first switch Q1 and the second switch Q2 can be used as a main switch, and the third switch Q3 and the fourth switch Q4 can be used as synchronous switches (the function is the same as that of a diode) to realize two-level voltage output.

Specifically, set the duty cycle of the switch as D, when 0<t<D*T (t is the real-time time, T is the switching period of the switch), the first switch Q1 and the second switch Q2 are turned on, and the third switch Q2 is turned on. The switch Q3 and the fourth switch Q4 are turned off, at this time the inductor L is charged for energy storage, and the battery is charged through the second gating circuit 130; when D*T<t<T, the first switch Q1 and the second switch Q2 is turned off, and the third switch Q3 and the fourth switch Q4 are turned on. At this time, the inductor L is discharged and the battery is charged through the second gating circuit 120 . It should be noted that the size of the duty cycle D can be adjusted according to the charging requirement, so as to adjust the charging voltage and charging current of the battery.

As another example, the three-level voltage output can be realized by controlling the first switch Q1 , the second switch Q2 , the third switch Q3 and the fourth switch Q4 to be alternately turned on. It should be noted that when performing three-level output, it is necessary to determine the ratio of the output voltage of the power supply circuit 100 to the voltage provided by the power supply. /2 (Vin is the voltage provided by the power supply, that is, the input voltage of the power supply circuit 100) and 0 to switch between 0 and 0 to achieve a voltage output of 0-Vin/2; The output voltage is switched between Vin/2 and Vin to realize the voltage output of Vin/2-Vin.

Specifically, when the duty ratio of the switch D<0.5, in a switching period T, if 0<t<D*T, the first switch Q1 and the third switch Q3 are controlled to be turned on, and the second switch Q2 and The fourth switch Q4 is turned off, the first capacitor C1 and the inductor L are charged, and the battery is charged through the second gating circuit 130; if D*T<t<0.5T, the first switch Q1 and the second switch Q2 are controlled to be off off, the third switch Q3 and the fourth switch Q4 are turned on, the first capacitor C1 does not form a loop and is not discharged, the inductor L is discharged, and the battery is charged through the second gating circuit 130; if 0.5T<t<D*T +0.5T, then the first switch Q1 and the second switch Q3 are controlled to be turned off, and the second switch Q2 and the fourth switch Q4 are turned on. At this time, the first capacitor C1 is discharged, and the inductor L is charged, and the second switch Q2 and the fourth switch Q4 are turned on. Charge the battery; if D*T+0.5T<t<T, control the first switch Q1 and the second switch Q2 to be turned off, the third switch Q3 and the fourth switch Q4 to be turned on, and the first capacitor C1 does not form a loop, When not discharged, the inductor L is discharged and the battery is charged through the second gating circuit 130 . It should be noted that, during the charging and discharging process of the first capacitor C1, the output voltage is at most half of the input voltage. By adjusting the duty cycle D, the output voltage can be adjusted within the range of 0 to Vin/2.

When the duty ratio D of the switch is 0.5≤D<1, in one switching period T, if 0<t<D*T-0.5T, the first switch Q1 and the second switch Q2 are controlled to be turned on, and the third switch Q2 is controlled to be turned on. The switch Q3 and the fourth switch Q4 are turned off, the first capacitor C1 does not form a loop, the inductor L is charged, and the battery is charged through the second gating circuit 130; if D*T-0.5T<t<0.5T, the first capacitor C1 is controlled to A switch Q1 and a third switch Q3 are turned on, the second switch Q2 and the fourth switch Q4 are turned off, the first capacitor C1 is charged for energy storage, the inductor L is discharged, and 130 batteries are charged through the second gating circuit; if 0.5T<t<D*T, then the first switch Q1 and the second switch Q2 are turned on, the third switch Q3 and the fourth switch Q4 are turned off, the first capacitor C1 does not form a loop, the inductor L is charged, and the The second gate circuit 130 charges the battery; if D*T<t<T, the first switch Q1 and the third switch Q3 are controlled to turn off, the second switch Q2 and the fourth switch Q4 are turned on, and the first capacitor C1 is discharged, The inductor L is discharged and the battery is charged through the second gating circuit 130 . In the above process, when 0<t<D*T-0.5T or 0.5T<t<D*T, since the first switch Q1 and the second switch Q2 are both turned on, the input voltage is equal to the output voltage, and in the rest Under normal conditions, the output voltage is half of the input voltage. By adjusting the duty cycle D, the output voltage can be adjusted in the range of Vin/2 to Vin.

In the above embodiment, the charge pump function and the step-down charging function can be realized in the same circuit by sharing the voltage conversion circuit and through the cooperation of the first gating circuit and the second gating circuit. The battery has high efficiency and low cost, and during fast charging, the battery can be directly charged through the first gating circuit, thereby avoiding the loss of the inductance and the second gating circuit.

In some embodiments, as shown in FIG. 2 , the first gating circuit 120 includes: a fifth switch Q5, a first terminal of the fifth switch Q5 is connected to the output terminal of the voltage conversion circuit 110, and a second terminal of the fifth switch Q5 is connected to the output terminal of the voltage conversion circuit 110. The terminal is connected to the battery, and the control terminal of the fifth switch Q5 is connected to the control circuit 140 . It should be noted that, the fifth switch Q5 can be a P-type MOS transistor, and when it is a P-type MOS transistor, the first terminal is the drain, the second terminal is the source, and the control terminal is the gate.

The second gating circuit 130 includes: a sixth switch Q6, the first end of the sixth switch Q6 is connected to the output end of the voltage conversion circuit 110 through the inductor L, the second end of the sixth switch Q6 is connected to the battery, and the sixth switch Q6 The control terminal is connected to the control circuit 140 . It should be noted that, the sixth switch Q6 may be a P-type MOS transistor, and when it is a P-type MOS transistor, the first end of the switch Q6 is the drain, the second end is the source, and the control end is the gate.

The control circuit 140 can control the on-off of the fifth switch Q5 and the sixth switch Q6 according to the charging requirement, and control the voltage conversion circuit 110 in the aforementioned manner to realize fast charging, precharging, constant voltage charging of the battery or supply power to the load .

Specifically, in the process of charging the battery by the power supply circuit 100 , the battery can be precharged with a small current first. At this time, the sixth switch Q6 can be controlled to be turned on, and the fifth switch Q5 can be turned off, so that the output of the voltage conversion circuit 110 can be turned off. The terminal is connected to the battery through the inductor L, and the voltage conversion circuit 110 is controlled by the aforementioned method to precharge the battery; after the precharge is completed, constant current charging can be performed, and fast charging can be performed at this time, which can control the fifth switch Q5 is turned on, and the sixth switch Q6 is turned off, so that the output end of the voltage conversion circuit 100 is directly connected to the battery, and the voltage conversion circuit 110 is controlled by the aforementioned method to quickly charge the battery; when the battery voltage reaches a certain value At this time, the battery can be charged with constant voltage. At this time, the sixth switch Q6 can be controlled to be turned on and the fifth switch Q5 can be turned off, so that the output end of the voltage conversion circuit 110 is connected to the battery through the inductor L, and the voltage is adjusted in the aforementioned manner. The conversion circuit 110 controls to charge the battery with constant voltage.

When the load needs to be powered, the sixth switch Q6 can be controlled to be turned on, and the fifth switch Q5 can be turned off, so that the battery is directly connected to the load, so that the battery directly supplies power to the load.

In the above embodiment, by controlling the on-off of the fifth switch Q5 and the sixth switch Q6 according to the charging requirement, and controlling the voltage conversion circuit 110 in the aforementioned manner, the fast charging, precharging and constant voltage charging of the battery can be realized, and further The whole charging process of the battery is realized, and the reuse rate of circuit components is high, the circuit integration is high, and the cost is low, and at the same time, it can supply power to the load.

In some embodiments, as shown in FIG. 3 , the second terminal of the fifth switch Q5 is also grounded to GND through the second capacitor C2 , so as to filter and smooth the output voltage of the voltage conversion circuit 110 during fast charging of the battery , to improve the stability of battery charging. The first end of the sixth switch Q6 is also grounded to GND through the third capacitor C3, so as to filter and smooth the output voltage when the battery is pre-charged or constant-voltage charged, so as to improve the stability of battery charging, and when the battery is charged to the load. When supplying power, improve the stability of battery power supply.

In some embodiments, continuing to refer to FIG. 3 , the above-mentioned power supply circuit 100 further includes: a seventh switch Q7 , the first end of the seventh switch Q7 is connected to the power supply, and the second end of the seventh switch Q7 is connected to the voltage conversion The input terminal of the circuit 110 is connected, and the control terminal of the seventh switch Q7 is connected to the control circuit 140 .

It should be noted that the seventh switch Q7 can be a P-type MOS transistor, and when it is a P-type MOS transistor, the first end is the drain, the second end is the source, and the control end is the gate.

When the power supply charges the battery through the power supply circuit 100, the control circuit 140 controls the seventh switch Q7 to turn on; when the battery supplies power to the load, the control circuit 140 controls the seventh switch Q7 to turn off, ensuring that the voltage provided by the battery does not pass through The first switch Q1 and the second switch Q2 are poured into the power supply. For example, when the first switch Q1 and the second switch Q2 are PMOS transistors with body diodes, it can be ensured that the voltage provided by the battery will not pass through the first switch Q1 and the second switch Q1. The body diode of the switch Q2 is poured back into the power supply, thereby achieving the effect of protecting the safety of the device.

In some embodiments, as shown in FIG. 3 , the control circuit 140 includes: a driver 141 and a controller 142 , and the controller 142 communicates with the voltage conversion circuit 110 , the first gating circuit 120 , the second gating circuit 130 and the voltage conversion circuit 110 through the driver 141 . The seventh switch Q7 is connected. Among them, the controller 142 writes the control logic for the power supply circuit 100 to realize fast charging, precharging or constant voltage charging of the battery, and power supply of the battery to the load. For details, please refer to the above, which will not be repeated here; the driver 141 A booster circuit is integrated inside, which can boost the driving voltage enough to turn on the above switches. The driver 141 is of conventional design and will not be described in detail here.

Further, as shown in FIG. 3 , the above-mentioned voltage conversion circuit 110 , first gating circuit 120 , second gating circuit 130 , control circuit 140 and seventh switch Q7 can be integrated in the same chip 200 . The multiplexing of the voltage conversion circuit 110 enables the chip 200 to have a high integration level and a high component multiplexing rate, and can simultaneously realize the charge pump function, the step-down charging function and the discharge function, and is conducive to chip miniaturization and cost reduction.

To sum up, according to the power supply circuit of the present invention, the charge pump function and the step-down charging function can be realized in the same circuit by sharing the voltage conversion circuit and through the cooperation of the first gating circuit and the second gating circuit, Therefore, fast charging and precharging or constant voltage charging can be realized through component reuse, which reduces the use of components, and reduces the layout area and cost.

In some embodiments, there is also provided an electronic device including the aforementioned power supply circuit.

According to the electronic device of the present utility model, through the aforementioned power supply circuit, through the common voltage conversion circuit, and through the cooperation of the first gating circuit and the second gating circuit, the charge pump and step-down functions can be realized in the same circuit, thereby Fast charging and precharging or constant voltage charging can be achieved through component reuse, which reduces the use of components, and reduces the layout area and cost.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection connected, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication between two elements or the interaction between the two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (11)

1. A power supply circuit, comprising:

the input end of the voltage conversion circuit is connected with a power supply;

one end of the first gating circuit is connected with the output end of the voltage conversion circuit, and the other end of the first gating circuit is connected with a battery;

one end of the second gating circuit is connected with the output end of the voltage conversion circuit through an inductor, the other end of the second gating circuit is connected with the battery, and one end of the second gating circuit is also connected with a load;

the control circuit is respectively connected with the voltage conversion circuit, the first gating circuit and the second gating circuit, and is used for controlling the power supply to quickly charge the battery through the voltage conversion circuit when the first gating circuit is in a conducting state; when the second gating circuit is in a conducting state, the power supply is controlled to pre-charge or charge the battery at a constant voltage through the voltage conversion circuit, or the battery is controlled to supply power to the load.

2. The power supply circuit according to claim 1, wherein the voltage conversion circuit comprises:

a first end of the first switch is connected with the input end of the voltage conversion circuit, and a control end of the first switch is connected with the control circuit;

a first end of the second switch is connected with a second end of the first switch, and a control end of the second switch is connected with the control circuit;

the first end of the third switch is connected with the second end of the second switch and then connected with the output end of the voltage conversion circuit, and the control end of the third switch is connected with the control circuit;

and a first end of the fourth switch is connected with the second end of the third switch, a second end of the fourth switch is grounded, and a control end of the fourth switch is connected with the control circuit.

3. The power supply circuit according to claim 2, wherein the first terminal of the second switch is connected to the second terminal of the first switch and then connected to one terminal of a first capacitor, and the first terminal of the fourth switch is connected to the second terminal of the third switch and then connected to the other terminal of the first capacitor.

4. The power supply circuit of claim 1, wherein the first gating circuit comprises:

and a first end of the fifth switch is connected with the output end of the voltage conversion circuit, a second end of the fifth switch is connected with the battery, and a control end of the fifth switch is connected with the control circuit.

5. The power supply circuit of claim 4, wherein the second terminal of the fifth switch is further coupled to ground through a second capacitor.

6. The power supply circuit of claim 1, wherein the second gating circuit comprises:

and a first end of the sixth switch is connected with the output end of the voltage conversion circuit through the inductor, a second end of the sixth switch is connected with the battery, and a control end of the sixth switch is connected with the control circuit.

7. The power supply circuit of claim 6, wherein the first terminal of the sixth switch is further coupled to ground through a third capacitor.

8. The power supply circuit according to claim 1, further comprising:

and a first end of the seventh switch is connected with the power supply, a second end of the seventh switch is connected with the input end of the voltage conversion circuit, and a control end of the seventh switch is connected with the control circuit.

9. The power supply circuit according to claim 8, wherein the voltage conversion circuit, the first gate circuit, the second gate circuit, the control circuit, and the seventh switch are integrally provided in the same chip.

10. The power supply circuit according to claim 8, wherein the control circuit includes a driver and a controller, and the controller is connected to the voltage conversion circuit, the first gate circuit, the second gate circuit, and the seventh switch through the driver.

11. An electronic device, characterized in that it comprises a power supply circuit according to any one of claims 1-10.

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