Power supply circuit, control method of power supply circuit, vehicle and electronic equipment

Abstract

The invention relates to a power supply circuit, a control method of the power supply circuit, a vehicle and electronic equipment, and the power supply circuit comprises a plurality of first voltage conversion circuits, each first voltage conversion circuit comprises an inductor, and each first voltage conversion circuit can supply power to a load; and the switching circuit is coupled with the plurality of first voltage conversion circuits, and the switching circuit is used for connecting the inductors in the at least two first voltage conversion circuits in series to form a second voltage conversion circuit for supplying power to a load. When the load is supplied with power through the second voltage conversion circuit, iron loss of the inductors can be reduced due to the fact that the inductors connected in series are large, and the efficiency of the power supply circuit is improved. Meanwhile, as each first voltage conversion circuit can supply power to the load, when the power required by the load is large, the current ripple of the inductor and the voltage ripple of the output voltage can be reduced, and the stability of the power supply circuit is improved.

Description

Technical Field

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

[0002] At present, as the power consumption of loads in vehicles and electronic equipment increases, the power supply circuit uses multiple voltage conversion circuits connected in parallel to supply power to the load in order to improve the load carrying capacity of the power supply circuit. However, when the load is in a light load state, the power supply circuit uses one of the multiple voltage conversion circuits to supply power to the load, and the power supply circuit has the problem of low efficiency. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a power supply circuit, a control method of the power supply circuit, a vehicle and an electronic device.

[0004] According to a first aspect of the present disclosure, a power supply circuit is provided, the power supply circuit comprising:

[0005] A plurality of first voltage conversion circuits, each of which includes an inductor, and each of which is capable of supplying power to a load;

[0006] A switch circuit is coupled to the plurality of first voltage conversion circuits, and the switch circuit is used to connect the inductors in at least two of the first voltage conversion circuits in series to form a second voltage conversion circuit that supplies power to the load.

[0007] In some embodiments of the present disclosure, the switch circuit includes:

[0008] a plurality of first switch units, each of which corresponds to one first voltage conversion circuit, and different first switch units correspond to different first voltage conversion circuits, each of which is coupled between a power supply and the inductor corresponding to the first voltage conversion circuit, or each of which is coupled between the inductor corresponding to the first voltage conversion circuit and the load;

[0009] At least one second switch unit, each of the second switch units is coupled between two of the inductors, so that the two inductors coupled to the same second switch unit are connected in series.

[0010] In some embodiments of the present disclosure, the first voltage conversion circuit includes a boost circuit; the first end of the first switch unit is coupled to the first end of the corresponding inductor, and the second end of the first switch unit is used to couple to the power supply.

[0011] In some embodiments of the present disclosure, the first voltage conversion circuit further includes a third switch unit and a fourth switch unit. In the same first voltage conversion circuit,

[0012] The first end of the third switch unit is coupled to the second end of the inductor, and the second end of the third switch unit is used to couple to both the first end of the load and the ground end;

[0013] A first end of the fourth switch unit is coupled to a second end of the inductor, and a second end of the fourth switch unit is used to couple to a second end of the load.

[0014] In some embodiments of the present disclosure, the first switch unit includes:

[0015] A first transistor, wherein a first end of the first transistor is coupled to a first end of the corresponding inductor, and a second end of the first transistor is used to couple to the power supply;

[0016] The second switch unit comprises:

[0017] a second transistor, wherein a first terminal of the second transistor is coupled to a second terminal of the inductor of one of the first voltage conversion circuits, and a second terminal of the second transistor is coupled to a first terminal of the inductor of another of the first voltage conversion circuits;

[0018] The third switch unit comprises:

[0019] a third transistor, wherein a first end of the third transistor is coupled to a second end of the inductor of the first voltage conversion circuit, and a second end of the third transistor is used to couple to both the first end of the load and the ground end;

[0020] The fourth switch unit comprises:

[0021] A fourth transistor, wherein a first end of the fourth transistor is coupled to a second end of the inductor of the first voltage conversion circuit, and a second end of the fourth transistor is used to couple to a second end of the load.

[0022] In some embodiments of the present disclosure, the first voltage conversion circuit further includes a first filter capacitor. In the same first voltage conversion circuit,

[0023] The first filter capacitor is coupled between the second end of the corresponding first switch unit and the ground end;

[0024] The power supply circuit also includes:

[0025] A second filter capacitor is coupled between a first node formed by coupling the second ends of each of the fourth switch units and the ground end.

[0026] In some embodiments of the present disclosure, the first voltage conversion circuit includes a step-down circuit; the first end of the first switch unit is coupled to the corresponding second end of the inductor, and the second end of the first switch unit is used to couple to the second end of the load.

[0027] In some embodiments of the present disclosure, the first voltage conversion circuit further includes a fifth switch unit and a sixth switch unit. In the same first voltage conversion circuit,

[0028] The first end of the fifth switch unit is coupled to the first end of the inductor, and the second end of the fifth switch unit is used to couple to the power supply;

[0029] The first end of the sixth switch unit is coupled to the first end of the inductor, and the second end of the sixth switch unit is used to be coupled to both the first end of the load and the ground end.

[0030] In some embodiments of the present disclosure, the first switch unit includes:

[0031] A first transistor, wherein a first terminal of the first transistor is coupled to a second terminal of the corresponding inductor, and a second terminal of the first transistor is used to couple to a second terminal of the load;

[0032] The second switch unit comprises:

[0033] a second transistor, wherein a first terminal of the second transistor is coupled to a second terminal of the inductor of one of the first voltage conversion circuits, and a second terminal of the second transistor is coupled to a first terminal of the inductor of another of the first voltage conversion circuits;

[0034] The fifth switch unit comprises:

[0035] a fifth transistor, wherein a first end of the fifth transistor is coupled to a first end of the inductor of the first voltage conversion circuit, and a second end of the fifth transistor is used to couple to the power supply;

[0036] The sixth switch unit comprises:

[0037] A sixth transistor, wherein a first end of the sixth transistor is coupled to a first end of the inductor of the first voltage conversion circuit, and a second end of the sixth transistor is used to couple to both a first end of the load and the ground end.

[0038] In some embodiments of the present disclosure, the first voltage conversion circuit further includes a third filter capacitor. In the same first voltage conversion circuit,

[0039] The third filter capacitor is coupled between the second end of the fifth switch unit and the ground end;

[0040] The power supply circuit also includes:

[0041] A fourth filter capacitor is coupled between a second node formed by coupling the second ends of each of the first switch units and the ground terminal.

[0042] In some embodiments of the present disclosure, a second switch unit is arranged between each two adjacent first voltage conversion circuits, one end of the second switch unit is coupled to the second end of the inductor in one of the first voltage conversion circuits, and the other end of the second switch unit is coupled to the first end of the inductor in another of the first voltage conversion circuits.

[0043] According to a second aspect of the present disclosure, a control method for a power supply circuit as described above is provided, and the control method for a power supply circuit includes:

[0044] determining a state of the load;

[0045] The state of the switch circuit is controlled according to the state of the load.

[0046] In some embodiments of the present disclosure, determining the state of the load includes:

[0047] detecting a current flowing through the load;

[0048] When the current flowing through the load is less than a preset current, determining that the state of the load is a first state;

[0049] When the current flowing through the load is greater than or equal to the preset current, the state of the load is determined to be the second state.

[0050] In some embodiments of the present disclosure, the first voltage conversion circuit includes a boost circuit; a second switch unit is disposed between each two adjacent first voltage conversion circuits, one end of the second switch unit is coupled to the second end of an inductor in one of the first voltage conversion circuits, and the other end of the second switch unit is coupled to the first end of an inductor in another of the first voltage conversion circuits; and controlling the state of the switch circuit according to the state of the load includes:

[0051] When the state of the load is the first state, controlling the first switch unit in the first first voltage conversion circuit to be turned on, and controlling the first switch units in the first voltage conversion circuits other than the first first voltage conversion circuit to be turned off;

[0052] Controlling each of the second switch units to be turned on;

[0053] When the state of the load is the second state, controlling each of the first switch units to be turned on;

[0054] Control each of the second switch units to be disconnected.

[0055] In some embodiments of the present disclosure, the first voltage conversion circuit includes a step-down circuit; a second switch unit is disposed between each two adjacent first voltage conversion circuits, one end of the second switch unit is coupled to the second end of an inductor in one of the first voltage conversion circuits, and the other end of the second switch unit is coupled to the first end of an inductor in another of the first voltage conversion circuits; and controlling the state of the switch circuit according to the state of the load includes:

[0056] When the state of the load is the first state, controlling the first switch unit in the last first voltage conversion circuit to be turned on, and controlling the first switch units in the first voltage conversion circuits other than the last first voltage conversion circuit to be turned off;

[0057] Controlling each of the second switch units to be turned on;

[0058] When the state of the load is the second state, controlling each of the first switch units to be turned on;

[0059] Control each of the second switch units to be disconnected.

[0060] In some embodiments of the present disclosure, after controlling each of the second switch units to be disconnected, the method for controlling the power supply circuit further includes:

[0061] Controlling the third switch units in each of the first voltage conversion circuits to be turned on alternately; or,

[0062] The fifth switch units in each of the first voltage conversion circuits are controlled to be turned on alternately.

[0063] According to a third aspect of the present disclosure, a vehicle is provided, comprising the power supply circuit as described above.

[0064] According to a fourth aspect of the present disclosure, an electronic device is provided, comprising the power supply circuit as described above.

[0065] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0066] The power supply circuit includes a plurality of first voltage conversion circuits and a switch circuit, each of which can supply power to a load to improve the load-carrying capacity of the power supply circuit, and the switch circuit can connect the inductors in at least two first voltage conversion circuits in series to form a second voltage conversion circuit that supplies power to the load. In the second voltage conversion circuit, the size of the inductor can be increased after the plurality of inductors are connected in series to reduce the ripple current flowing through the inductor. When the load is powered by the second voltage conversion circuit, the large inductor after the series connection can reduce the iron loss of the inductor, thereby improving the efficiency of the power supply circuit. At the same time, since each first voltage conversion circuit can supply power to the load, when the power required by the load is large, the current ripple of the inductor and the voltage ripple of the output voltage can be reduced, thereby improving the stability of the power supply circuit.

[0067] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0069] Figure 1-1 It is a schematic diagram of the structure of a power supply circuit;

[0070] Figure 1-2 It is a structural diagram of another power supply circuit;

[0071] Figure 2 It is a curve diagram of the efficiency and load current of a power supply circuit;

[0072] Figure 3 is a structural schematic diagram of a power supply circuit provided by an exemplary embodiment of the present disclosure;

[0073] Figure 4 is a structural schematic diagram of a power supply circuit provided by another exemplary embodiment of the present disclosure;

[0074] Figure 5 is a structural schematic diagram of a power supply circuit provided by another exemplary embodiment of the present disclosure;

[0075] Figure 6-1 is a structural schematic diagram of a power supply circuit provided by another exemplary embodiment of the present disclosure;

[0076] Figure 6-2 is a structural schematic diagram of a power supply circuit provided by another exemplary embodiment of the present disclosure;

[0077] Figure 7 is a structural schematic diagram of a power supply circuit provided by another exemplary embodiment of the present disclosure;

[0078] Figure 8-1 is a structural schematic diagram of a power supply circuit provided by another exemplary embodiment of the present disclosure;

[0079] Figure 8-2 is a structural schematic diagram of a power supply circuit provided by another exemplary embodiment of the present disclosure;

[0080] Fig. 9 is a flow chart of a control method of a power supply circuit provided by an exemplary embodiment of the present disclosure;

[0081] Fig.10 is a flow chart of a method for controlling a power supply circuit provided by another exemplary embodiment of the present disclosure;

[0082] Fig.11 is a system block diagram of an electronic device provided by an exemplary embodiment of the present disclosure.

[0083] In the figure:

[0084] 10-load; 20-first voltage conversion circuit; 21-third switch unit; 22-fourth switch unit; 23-fifth switch unit; 24-sixth switch unit; 30-switch circuit; 31-first switch unit; 32-second switch unit; L-inductor; L1-first inductor; L2-second inductor; T1-first transistor; T2-second transistor; T3-third transistor; T4-fourth transistor; T5-fifth transistor; T6-sixth transistor; C1-first filter capacitor; C2-second filter capacitor; C3-third filter capacitor; C4-fourth filter capacitor; VCC-power supply; GND-ground terminal; N1-first node; N2-second node; 400-electronic device; 402-processing component; 404-memory; 406-power supply component; 408-multimedia component; 410-audio component; 412-input and output interface; 414-sensor component; 416-communication component; 420-processor. DETAILED DESCRIPTION

[0085] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0086] At present, with the increase of load power consumption in vehicles and electronic equipment, when a single voltage conversion circuit is used as a power supply circuit to supply power to the load, the current stress of the device in the voltage conversion circuit is large. Due to the limited current stress of the device, the output power of the voltage conversion circuit cannot continue to increase after reaching a certain level. In addition, the current ripple of the inductor in the voltage conversion circuit and the voltage ripple of the output voltage are large, which affects the stability of the power supply circuit.

[0087] In the related art, a power supply circuit is provided, which uses a plurality of voltage conversion circuits connected in parallel to supply power to a load. Figure 1-1 As shown, when the power supply circuit needs to supply power to the vehicle, the voltage conversion circuit may include a boost circuit. Each voltage conversion circuit includes a first inductor L1, a first transistor T1, a second transistor T2 and a first filter capacitor C1. In a voltage conversion circuit, the first end of the first inductor L1 is coupled to the power supply VCC and the first end of the first filter capacitor C1, and the second end is coupled to the first end of the first transistor T1 and the first end of the second transistor T2. The second end of the first transistor T1 and the second end of the first filter capacitor C1 are both used to couple with the first end of the load 10 and the ground terminal GND. The second end of the second transistor T2 is used to couple with the second end of the load 10. The power supply circuit also includes a second filter capacitor C2. The second filter capacitor C2 is coupled between the first node N1 formed by the second end of each second transistor T2 and the ground terminal GND.

[0088] like Figure 1-2 As shown, when the power supply circuit needs to power the electronic device, the voltage conversion circuit may include a step-down circuit. Each voltage conversion circuit includes a second inductor L2, a third transistor T3, a fourth transistor T4 and a third filter capacitor C3. In a voltage conversion circuit, the first end of the third transistor T3 is coupled to the power supply VCC and the first end of the third filter capacitor C3, and the second end is coupled to the first end of the fourth transistor T4 and the first end of the second inductor L2. The second end of the fourth transistor T4 and the second end of the third filter capacitor C3 are both used to couple with the first end of the load 10 and the ground terminal GND. The second end of the second inductor L2 is used to couple with the second end of the load 10. The power supply circuit also includes a fourth filter capacitor C4. The fourth filter capacitor C4 is coupled between the second node N2 formed by the second end of each second inductor L2 and the ground terminal GND.

[0089] In the power supply circuit, when the load 10 is in a light load state, one voltage conversion circuit is controlled to supply power to the load 10 and other voltage conversion circuits are controlled to be disconnected. When the load 10 is in a heavy load state, each voltage conversion circuit is controlled to supply power to the load 10. Although in a heavy load state, multiple voltage conversion circuits supplying power to the load 10 at the same time can reduce the current stress of the device to increase the output power, and reduce the current ripple of the inductor and the voltage ripple of the output voltage. However, in a light load state, the current ripple of the inductor is not reduced, and the current flowing through the inductor is small. Figure 2 As shown in FIG. 1 , when the current flowing through the inductor is small and the current ripple of the inductor is large, the iron loss in the inductor is larger than the copper loss, resulting in low efficiency of the power supply circuit. Wherein, I represents the load current, and η represents the efficiency of the power supply circuit. The efficiency of the power supply circuit can be the ratio of the output power of the power supply circuit to the input power.

[0090] Based on this, the present disclosure provides a power supply circuit, in which a switch circuit in the power supply circuit can connect inductors in at least two first voltage conversion circuits in series to form a second voltage conversion circuit that supplies power to a load. Since the inductor in the second voltage conversion circuit is greater than the inductor in the first voltage conversion circuit, the ripple current flowing through the inductor is reduced. When the load is in a light load state, the reduction in the ripple current of the inductor reduces the iron loss of the inductor, thereby improving the efficiency of the power supply circuit. At the same time, when the load is in a heavy load state, each first voltage conversion circuit can supply power to the load, thereby improving the efficiency of the power supply circuit. That is, at each power of the load, the power supply circuit has a higher efficiency.

[0091] like Figure 3 As shown, an exemplary embodiment of the present disclosure provides a power supply circuit, which includes a plurality of first voltage conversion circuits 20 and a switch circuit 30. Each first voltage conversion circuit 20 includes an inductor L, and each first voltage conversion circuit 20 is capable of supplying power to a load 10. The switch circuit 30 is coupled to the plurality of first voltage conversion circuits 20, and is used to connect the inductors L in at least two first voltage conversion circuits 20 in series to form a second voltage conversion circuit that supplies power to the load 10.

[0092] In this embodiment, the power supply circuit includes a plurality of first voltage conversion circuits and a switch circuit, each of which can supply power to the load to improve the load capacity of the power supply circuit, and the switch circuit can connect the inductors in at least two first voltage conversion circuits in series to form a second voltage conversion circuit that supplies power to the load. In the second voltage conversion circuit, the size of the inductor can be increased after the plurality of inductors are connected in series to reduce the ripple current flowing through the inductor. When the load is powered by the second voltage conversion circuit, the large inductor after the series connection can reduce the iron loss of the inductor, thereby improving the efficiency of the power supply circuit. At the same time, since each first voltage conversion circuit can supply power to the load, when the power required by the load is large, the current ripple of the inductor and the voltage ripple of the output voltage can be reduced, thereby improving the stability of the power supply circuit.

[0093] Exemplarily, when the number of the first voltage conversion circuits 20 is greater than three, the switch circuit 30 may connect the inductors L in at least two of the first voltage conversion circuits 20 in series to form a second voltage conversion circuit that supplies power to the load 10, and the number of the second voltage conversion circuits may be one or more. For example, when the number of the first voltage conversion circuits 20 is six, the switch circuit 30 may connect the inductors L in every two of the first voltage conversion circuits 20 in series to form three second voltage conversion circuits that supply power to the load 10, or may connect the inductors L in every three of the first voltage conversion circuits 20 in series to form two second voltage conversion circuits that supply power to the load 10, or may connect the inductors L in six first voltage conversion circuits 20 in series to form one second voltage conversion circuit that supplies power to the load 10. Since the number of the second voltage conversion circuits may be one or more, when the power required by the load 10 is different, the loss of the inductor L may be minimized to improve the efficiency of the power supply circuit. When the number of the first voltage conversion circuits 20 is less than or equal to three, the switch circuit 30 may connect the inductors L in two or three of the first voltage conversion circuits 20 in series to form a second voltage conversion circuit that supplies power to the load 10, and the number of the second voltage conversion circuit is one.

[0094] Exemplarily, the power supply circuit may include at least one third voltage conversion circuit in addition to the first voltage conversion circuit 20 . The third voltage conversion circuit is not coupled to the switch circuit 30 and is capable of supplying power to the load 10 .

[0095] In one embodiment, if Figure 4As shown, the switch circuit 30 includes a plurality of first switch units 31 and at least one second switch unit 32. Each first switch unit 31 corresponds to a first voltage conversion circuit 20, and different first switch units 31 correspond to different first voltage conversion circuits 20. Each first switch unit 31 is coupled between the power supply VCC and the inductor L corresponding to the first voltage conversion circuit 20. At this time, the output end of each first voltage conversion circuit 20 is used to couple with the load 10. Or, each first switch unit 31 is coupled between the inductor L corresponding to the first voltage conversion circuit 20 and the load 10. At this time, the input end of each first voltage conversion circuit 20 is used to couple with the power supply VCC. Each second switch unit 32 is coupled between two inductors L so that the two inductors L coupled to the same second switch unit 32 are connected in series.

[0096] In this embodiment, since the plurality of first switch units correspond one-to-one to the plurality of first voltage conversion circuits, different first voltage conversion circuits can be turned on with the power supply or the load through the first switch unit, thereby avoiding the occurrence of a short circuit problem caused by the introduction of the second switch unit to improve the reliability of the power supply circuit. Since the second switch unit is coupled between the two inductors, when the second switch unit is turned on, the two inductors can be connected in series to reduce the iron loss of the inductors, thereby improving the efficiency of the power supply circuit.

[0097] Exemplarily, the second switch unit 32 can be coupled between the same end of the two inductors L, or can be coupled between different ends. It only needs to be coupled so that the inductors L can be connected in series without short circuit when the second switch unit 32 is turned on. This is not limited here.

[0098] Exemplarily, the number of the first switch units 31 and the first voltage conversion circuit 20 may be the same, that is, a one-to-one correspondence. The number of the first switch units 31 and the first voltage conversion circuit 20 may also be different. When the number of the first switch units 31 and the first voltage conversion circuit 20 is different, in order to minimize the loss of the power supply circuit when the load 10 is in a light load state, the number of the first switch units 31 may be the number of the first voltage conversion circuit 20 minus one. It can be understood that, depending on the different loads 10 and the different control methods, the number of the first switch units 31 may also be less than the number of the first voltage conversion circuit 20 minus one, which is not limited here.

[0099] Exemplarily, in order to minimize the loss of the power supply circuit when the load 10 is in a light load state, the number of the second switch units 32 may be the number of the first voltage conversion circuits 20 minus one. At this time, the second switch units 32 may connect the inductors L of each first voltage conversion circuit 20 in series. It is understandable that, depending on the different loads 10 and the different control methods, the number of the second switch units 32 may also be less than the number of the first voltage conversion circuits 20 minus one, which is not limited here.

[0100] In one embodiment, if Figure 5 As shown, the first voltage conversion circuit 20 includes a boost circuit. A first end of the first switch unit 31 is coupled to a first end of a corresponding inductor L, and a second end is used to couple to a power supply VCC.

[0101] In this embodiment, since there is no switch unit between the inductor and the power supply in the boost circuit, and there is a switch unit between the inductor and the load. Since the second switch unit is coupled between the two inductors, if it is necessary to control the series connection of the inductors in the multiple first voltage conversion circuits without short circuit, the first switch unit needs to be arranged between the inductor and the power supply to cut off the short circuit loop. By arranging the first switch unit between the inductor and the power supply, a short circuit of the power supply circuit caused by the series connection of the inductors is avoided, thereby improving the reliability of the power supply circuit.

[0102] Exemplarily, the first switch unit 31 and the second switch unit 32 are located at different ends of the inductor L.

[0103] Exemplarily, the voltage boosting circuit may be a Boost circuit.

[0104] In one embodiment, the first voltage conversion circuit 20 further includes a third switch unit 21 and a fourth switch unit 22. In the same first voltage conversion circuit 20, the first end of the third switch unit 21 is coupled to the second end of the inductor L, and the second end is used to couple to the first end of the load 10 and the ground terminal GND. The first end of the fourth switch unit 22 is coupled to the second end of the inductor L, and the second end is used to couple to the second end of the load 10. The voltage of the power supply VCC is a voltage relative to the ground terminal GND.

[0105] In this embodiment, by controlling the third switch unit, the voltage of the power supply can be boosted to supply power to the load, thereby improving the reliability of the power supply. Since the power consumption of the switch unit is low when it is turned on, by replacing the diode with the fourth switch unit for synchronous rectification, the loss of the power supply circuit is reduced to improve the efficiency of the power supply circuit. At the same time, since the fourth switch unit is coupled between the second end of the inductor and the load, by controlling the fourth switch unit, it is possible to avoid the inductor being directly turned on to supply power to the load and being unable to be connected in series, thereby improving the reliability of the power supply circuit.

[0106] Exemplarily, when the number of the first switch units 31 and the first voltage conversion circuit 20 is different, the first voltage conversion circuit 20 whose first end of the inductor L is not coupled to the second switch unit 32 may not correspond to the first switch unit 31 .

[0107] In one embodiment, the first switch unit 31 includes a first transistor T1. The first end of the first transistor T1 is coupled to the first end of the corresponding inductor L, and the second end is used to couple with the power supply VCC. The second switch unit 32 includes a second transistor T2. The first end of the second transistor T2 is coupled to the second end of the inductor L of a first voltage conversion circuit 20, and the second end is coupled to the first end of the inductor L of another first voltage conversion circuit 20. The third switch unit 21 includes a third transistor T3. The first end of the third transistor T3 is coupled to the second end of the inductor L of the first voltage conversion circuit 20, and the second end is used to couple with the first end of the load 10 and the ground terminal GND. The fourth switch unit 22 includes a fourth transistor T4. The first end of the fourth transistor T4 is coupled to the second end of the inductor L of the first voltage conversion circuit 20, and the second end is used to couple with the second end of the load 10.

[0108] In this embodiment, since the transistor is easy to control and has low power consumption, the loss of the power supply circuit and the complexity of control are reduced by using the first transistor to control the on-off connection between the power supply and the corresponding inductor, using the second transistor to connect or disconnect different inductors in series, using the third transistor to boost the voltage of the power supply, and using the fourth transistor to perform synchronous rectification and control the on-off connection between the load and the inductor.

[0109] In one embodiment, the first voltage conversion circuit 20 further includes a first filter capacitor C1. In the same first voltage conversion circuit 20, the first filter capacitor C1 is coupled between the second end of the corresponding first switch unit 31 and the ground terminal GND. The power supply circuit further includes a second filter capacitor C2. The second filter capacitor C2 is coupled between the first node N1 formed by the second end of each fourth switch unit 22 and the ground terminal GND.

[0110] In this embodiment, the voltage ripple in the power supply can be reduced and the voltage input by the power supply can be stabilized by the first filter capacitor, thereby reducing the voltage ripple output by the power supply circuit to the load to improve the stability of the power supply circuit. The voltage ripple output by the power supply circuit to the load can be reduced and the voltage output by the power supply circuit to the load can be stabilized by the second filter capacitor, thereby further improving the stability of the power supply circuit.

[0111] Exemplarily, taking the number of the first voltage conversion circuit 20 as two as an example, the first voltage conversion circuit 20 powering the load 10 in different modes is described. The first voltage conversion circuit 20 includes an inductor L, a third transistor T3, a fourth transistor T4 and a first filter capacitor C1. The switch circuit 30 includes a first transistor T1 and a second transistor T2. The first end of the first transistor T1 is coupled to the first end of the corresponding inductor L, and the second end is used to couple with the power supply VCC. The first end of the second transistor T2 is coupled to the second end of the inductor L of one first voltage conversion circuit 20, and the second end is coupled to the first end of the inductor L of another first voltage conversion circuit 20. The first end of the third transistor T3 is coupled to the second end of the inductor L of the first voltage conversion circuit 20 and the first end of the fourth transistor T4, and the second end is used to couple with the first end of the load 10 and the ground terminal GND. The second end of the fourth transistor T4 is used to couple with the second end of the load 10. The first filter capacitor C1 is coupled between the second end of the corresponding first transistor T1 and the ground terminal GND. The power supply circuit also includes a second filter capacitor C2. The second filter capacitor C2 is coupled between the first node N1 formed by the second ends of each fourth switch unit 22 and the ground terminal GND. Figure 6-1 As shown, when it is necessary to connect the inductors L in the two first voltage conversion circuits 20 in series to form a second voltage conversion circuit that supplies power to the load 10, in the first voltage conversion circuit 20 where the first end of the inductor L is not coupled to the second transistor T2, the first transistor T1 is turned on, and the third transistor T3 and the fourth transistor T4 are turned off. In the first voltage conversion circuit 20 where the second end of the inductor L is not coupled to the second transistor T2, the first transistor T1 is turned off, and the third transistor T3 and the fourth transistor T4 are controlled to be turned on and off to perform boosting and synchronous rectification. The second transistor T2 is in the on state. Figure 6-2 As shown, when two first voltage conversion circuits 20 are required to supply power to the load 10 simultaneously, each first transistor T1 is turned on, each third transistor T3 and each fourth transistor T4 are controlled to be turned on and off for boosting and synchronous rectification. The second transistor T2 is in the off state.

[0112] Exemplarily, the power supply circuit further includes a first control circuit. The first control circuit is coupled to each first switch unit 31, each second switch unit 32, each third switch unit 21, and each fourth switch unit 22, and is used to control the on and off of each first switch unit 31, each second switch unit 32, each third switch unit 21, and each fourth switch unit 22.

[0113] In one embodiment, if Figure 7 As shown, the first voltage conversion circuit 20 includes a step-down circuit. The first end of the first switch unit 31 is coupled to the second end of the corresponding inductor L, and the second end is used to couple to the second end of the load 10.

[0114] In this embodiment, since there is no switch unit between the inductor and the load in the step-down circuit, but there is a switch unit between the inductor and the power supply. Since the second switch unit is coupled between the two inductors, if it is necessary to control the series connection of the inductors in the first voltage conversion circuit without short circuit, the first switch unit needs to be arranged between the inductor and the load to cut off the short circuit loop. By arranging the first switch unit between the inductor and the load, a short circuit of the power supply circuit caused by the series connection of the inductors is avoided, thereby improving the reliability of the power supply circuit.

[0115] Exemplarily, the first switch unit 31 and the second switch unit 32 may be located at the same end of the inductor L.

[0116] Exemplarily, the step-down circuit may be a Buck circuit.

[0117] In one embodiment, the first voltage conversion circuit 20 further includes a fifth switch unit 23 and a sixth switch unit 24. In the same first voltage conversion circuit 20, the first end of the fifth switch unit 23 is coupled to the first end of the inductor L, and the second end is used to couple with the power supply VCC. The first end of the sixth switch unit 24 is coupled to the first end of the inductor L, and the second end is used to couple with the first end of the load 10 and the ground terminal GND.

[0118] In this embodiment, by controlling the fifth switch unit, the voltage of the power supply can be stepped down to supply power to the load, thereby improving the reliability of the power supply. Since the power consumption of the switch unit is low when it is turned on, by replacing the diode with the sixth switch unit for synchronous rectification, the loss of the power supply circuit is reduced to improve the efficiency of the power supply circuit. At the same time, since the sixth switch unit is coupled between the first end of the inductor and the ground end, by controlling the sixth switch unit, it is possible to avoid the inductor being directly turned on to the ground end to short-circuit and unable to be connected in series, thereby improving the reliability of the power supply circuit.

[0119] Exemplarily, when the number of the first switch units 31 and the first voltage conversion circuit 20 is different, the first voltage conversion circuit 20 whose second end of the inductor L is not coupled to the second switch unit 32 may not correspond to the first switch unit 31 .

[0120] In one embodiment, the first switch unit 31 includes a first transistor T1. The first end of the first transistor T1 is coupled to the second end of the corresponding inductor L, and the second end is used to couple to the second end of the load 10. The second switch unit 32 includes a second transistor T2. The first end of the second transistor T2 is coupled to the second end of the inductor L of a first voltage conversion circuit 20, and the second end is coupled to the first end of the inductor L of another first voltage conversion circuit 20. The fifth switch unit 23 includes a fifth transistor T5. The first end of the fifth transistor T5 is coupled to the first end of the inductor L of the first voltage conversion circuit 20, and the second end is used to couple to the power supply VCC. The sixth switch unit 24 includes a sixth transistor T6. The first end of the sixth transistor T6 is coupled to the first end of the inductor L of the first voltage conversion circuit 20, and the second end is used to couple to the first end of the load 10 and the ground terminal GND.

[0121] In this embodiment, since the transistors are easy to control and have low power consumption, the loss of the power supply circuit and the complexity of control are reduced by using the first transistor to control the on / off connection between the load and the corresponding inductor, using the second transistor to connect or disconnect different inductors in series, using the fifth transistor to step down the voltage of the power supply and control the on / off connection between the power supply and the inductor, and using the sixth transistor to perform synchronous rectification.

[0122] In one embodiment, the first voltage conversion circuit 20 further includes a third filter capacitor C3. In the same first voltage conversion circuit 20, the third filter capacitor C3 is coupled between the second end of the corresponding fifth switch unit 23 and the ground terminal GND. The power supply circuit further includes a fourth filter capacitor C4. The fourth filter capacitor C4 is coupled between the second node N2 formed by the second end of each first switch unit 31 and the ground terminal GND.

[0123] In this embodiment, the third filter capacitor can reduce the voltage ripple in the power supply and stabilize the voltage input by the power supply, thereby reducing the voltage ripple output by the power supply circuit to the load to improve the stability of the power supply circuit. The fourth filter capacitor can reduce the voltage ripple output by the power supply circuit to the load and stabilize the voltage output by the power supply circuit to the load, thereby further improving the stability of the power supply circuit.

[0124] Exemplarily, when the first voltage conversion circuit 20 does not correspond to the first switch unit 31, the second end of the inductor L of the first voltage conversion circuit 20 is coupled to the second end of the first switch unit 31 corresponding to other first voltage conversion circuits 20 to form a second node N2.

[0125] Exemplarily, taking the number of the first voltage conversion circuit 20 as two as an example, the first voltage conversion circuit 20 powering the load 10 in different modes is described. The first voltage conversion circuit 20 includes an inductor L, a fifth transistor T5, a sixth transistor T6 and a third filter capacitor C3. The switch circuit 30 includes a first transistor T1 and a second transistor T2. The first end of the first transistor T1 is coupled to the second end of the corresponding inductor L, and the second end is used to couple with the second end of the load 10. The first end of the second transistor T2 is coupled to the second end of the inductor L of one first voltage conversion circuit 20, and the second end is coupled to the first end of the inductor L of another first voltage conversion circuit 20. The first end of the fifth transistor T5 is coupled to the first end of the inductor L of the first voltage conversion circuit 20 and the first end of the sixth transistor T6, and the second end is used to couple with the power supply VCC. The second end of the sixth transistor T6 is used to couple with the first end of the load 10 and the ground terminal GND. The power supply circuit also includes a fourth filter capacitor C4. The fourth filter capacitor C4 is coupled between the second node N2 formed by the second ends of the first switch units 31 and the ground terminal GND. Figure 8-1 As shown, when it is necessary to connect the inductors L in the two first voltage conversion circuits 20 in series to form a second voltage conversion circuit that supplies power to the load 10, in the first voltage conversion circuit 20 where the first end of the inductor L is not coupled to the second transistor T2, the first transistor T1 is disconnected, and the fifth transistor T5 and the sixth transistor T6 are controlled to be turned on and off to perform voltage reduction and synchronous rectification. In the first voltage conversion circuit 20 where the second end of the inductor L is not coupled to the second transistor T2, the first transistor T1 is turned on, and the fifth transistor T5 and the sixth transistor T6 are turned off. The second transistor T2 is in the on state. Figure 8-2 As shown, when two first voltage conversion circuits 20 are required to supply power to the load 10 simultaneously, each first transistor T1 is turned on, each fifth transistor T5 and each sixth transistor T6 are controlled to be turned on and off to perform voltage reduction and synchronous rectification. The second transistor T2 is in the off state.

[0126] In one embodiment, a second switch unit 32 is disposed between each two adjacent first voltage conversion circuits 20, and one end of the second switch unit 32 is coupled to the second end of the inductor L in one first voltage conversion circuit 20, and the other end is coupled to the first end of the inductor L in another first voltage conversion circuit 20.

[0127] In this embodiment, by setting a second switching unit between each two adjacent first voltage conversion circuits, the inductors in each first voltage conversion circuit can be connected in series to form a second voltage conversion circuit, so as to minimize the iron loss of the inductor in the second voltage conversion circuit and improve the efficiency of the power supply circuit.

[0128] Exemplarily, the power supply circuit further includes a second control circuit. The second control circuit is coupled to each first switch unit 31, each second switch unit 32, each fifth switch unit 23, and each sixth switch unit 24, and is used to control the on and off of each first switch unit 31, each second switch unit 32, each fifth switch unit 23, and each sixth switch unit 24.

[0129] It is understandable that the first voltage conversion circuit 20 may include not only a boost circuit and a buck circuit, but also a buck-boost circuit, etc., which is not limited here.

[0130] An exemplary embodiment of the present disclosure further provides a control method for a power supply circuit, which can be applied to the above-mentioned circuit structure, such as Fig. 9 As shown, the control method of the power supply circuit includes:

[0131] S100: Determine the state of the load.

[0132] S200: Control the state of the switch circuit according to the state of the load.

[0133] In this embodiment, the state of the load is determined to determine whether the inductor in the first voltage conversion circuit needs to be connected in series. According to the state of the load, the state of the switch circuit is controlled so that the multiple first voltage conversion circuits respectively supply power to the load or at least one second voltage conversion circuit supplies power to the load. By controlling the state of the switch circuit according to the state of the load, the demand for power supply to the load can be met or the iron loss of the inductor can be reduced, thereby improving the stability of the power supply circuit and the efficiency of the power supply circuit.

[0134] In one embodiment, if Fig.10 As shown, the load status determined in step S100 may be determined in the following manner:

[0135] S110. Detect the current flowing through the load.

[0136] S120: When the current flowing through the load is less than a preset current, determine that the state of the load is a first state.

[0137] S130: When the current flowing through the load is greater than or equal to the preset current, determine that the state of the load is the second state.

[0138] In this embodiment, since the load is generally a load powered by a constant voltage, the power of the load depends on the current flowing through the load, and the current flowing through the load is detected to determine the power of the load. When the current flowing through the load is less than the preset current, the power required by the load is small, and the state of the load is determined to be the first state. When the current flowing through the load is greater than or equal to the preset current, the power required by the load is large, and the state of the load is determined to be the second state. By determining the state of the load by detecting the magnitude of the current, the error in power determination is reduced, thereby improving the reliability of the power supply circuit control.

[0139] Exemplarily, the preset current may be in the range of 1% to 30% of the rated current, or may be 10%, 15%, 20%, etc. of the rated current.

[0140] Exemplarily, the first state may be a light-load state, and the second state may be a heavy-load state.

[0141] Exemplarily, when the load is a variable voltage load, the state of the load determined in step S100 may also be determined in the following manner:

[0142] Sense the voltage across the load and the current flowing through the load.

[0143] Determine the power of the load based on the voltage across the load and the current flowing through the load.

[0144] When the power of the load is less than the preset power, the state of the load is determined to be the first state.

[0145] When the power of the load is greater than or equal to the preset power, the state of the load is determined to be the second state.

[0146] Exemplarily, the preset power may be in the range of 1% to 30% of the rated power, or may be 10%, 15%, 20% or the like of the rated power.

[0147] In one embodiment, the first voltage conversion circuit includes a boost circuit. A second switch unit is provided between each two adjacent first voltage conversion circuits, one end of the second switch unit is coupled to the second end of the inductor in one first voltage conversion circuit, and the other end of the second switch unit is coupled to the first end of the inductor in another first voltage conversion circuit. In step S200, the state of the control switch circuit is determined according to the state of the load in the following manner:

[0148] When the state of the load is the first state, the first switch unit in the first first voltage conversion circuit is controlled to be turned on, and the first switch units in the first voltage conversion circuits other than the first first voltage conversion circuit are controlled to be turned off.

[0149] Control each second switch unit to be turned on.

[0150] When the state of the load is the second state, each first switch unit is controlled to be turned on.

[0151] Control each second switch unit to be disconnected.

[0152] In this embodiment, when the state of the load is the first state, it is necessary to connect the inductors in each first voltage conversion circuit in series to form a second voltage conversion circuit that supplies power to the load. The first switch unit in the first first voltage conversion circuit is controlled to be turned on, and the first switch units in the first voltage conversion circuits other than the first first voltage conversion circuit are controlled to be turned off to prevent a short circuit from occurring after the inductors in the boost circuit are connected in series. Each second switch unit is controlled to be turned on to connect the inductors in each first voltage conversion circuit in series. When the state of the load is the second state, it is necessary for each first voltage conversion circuit to supply power to the load, and each first switch unit is controlled to be turned on so that the power supply can supply power to each first voltage conversion circuit. Each second switch unit is controlled to be turned off to avoid the inductors being connected in series. By controlling the first switch unit and the second switch unit in different ways under different load states, the stability and efficiency of the power supply circuit are improved.

[0153] Exemplarily, the first first voltage conversion circuit may be a first voltage conversion circuit in which the first end of the inductor is not coupled to the second switch unit. When the first voltage conversion circuit does not have a corresponding first switch unit, the above step of controlling the first switch unit in the first first voltage conversion circuit to be turned on may not be performed. At this time, it is only necessary to control the first switch unit in each first voltage conversion circuit to be turned off.

[0154] In one embodiment, the first voltage conversion circuit includes a step-down circuit. A second switch unit is provided between each two adjacent first voltage conversion circuits, one end of the second switch unit is coupled to the second end of the inductor in one first voltage conversion circuit, and the other end of the second switch unit is coupled to the first end of the inductor in another first voltage conversion circuit. In step S200, the state of the control switch circuit is determined according to the state of the load in the following manner:

[0155] When the state of the load is the first state, the first switch unit in the last first voltage conversion circuit is controlled to be turned on, and the first switch units in the first voltage conversion circuits other than the last first voltage conversion circuit are controlled to be turned off.

[0156] Control each second switch unit to be turned on.

[0157] When the state of the load is the second state, each first switch unit is controlled to be turned on.

[0158] Control each second switch unit to be disconnected.

[0159] In this embodiment, when the state of the load is the first state, it is necessary to connect the inductors in each first voltage conversion circuit in series to form a second voltage conversion circuit that supplies power to the load. The first switch unit in the last first voltage conversion circuit is controlled to be turned on, and the first switch units in the first voltage conversion circuits other than the last first voltage conversion circuit are controlled to be turned off to prevent a short circuit from occurring after the inductors in the step-down circuit are connected in series. Each second switch unit is controlled to be turned on to connect the inductors in each first voltage conversion circuit in series. When the state of the load is the second state, it is necessary for each first voltage conversion circuit to supply power to the load, and each first switch unit is controlled to be turned on so that each first voltage conversion circuit can supply power to the load. Each second switch unit is controlled to be turned off to avoid the inductors being connected in series. By controlling the first switch unit and the second switch unit in different ways under different load states, the stability and efficiency of the power supply circuit are improved.

[0160] Exemplarily, the last first voltage conversion circuit may be a first voltage conversion circuit in which the second end of the inductor is not coupled to the second switch unit. When the last voltage conversion circuit does not have a corresponding first switch unit, the above step of controlling the first switch unit in the last first voltage conversion circuit to be turned on may not be performed. At this time, it is only necessary to control the first switch units in each first voltage conversion circuit to be turned off.

[0161] In one embodiment, when the first voltage conversion circuit includes a boost circuit, after controlling each second switch unit to be disconnected in the above steps, the control method of the power supply circuit further includes:

[0162] The third switch units in each first voltage conversion circuit are controlled to be turned on alternately.

[0163] In this embodiment, by controlling the third switch units in each first voltage conversion circuit to be turned on alternately, the current ripple of each inductor can be reduced and the current stress of the third switch unit can be reduced, thereby improving the stability of the power supply circuit.

[0164] In one embodiment, when the first voltage conversion circuit includes a step-down circuit, after controlling each second switch unit to be disconnected in the above steps, the control method of the power supply circuit further includes:

[0165] The fifth switch units in each first voltage conversion circuit are controlled to be turned on alternately.

[0166] In this embodiment, by controlling the fifth switch units in each first voltage conversion circuit to be turned on alternately, the current ripple of each inductor can be reduced and the current stress of the fifth switch unit can be reduced, thereby improving the stability of the power supply circuit.

[0167] In an exemplary embodiment, a vehicle is provided. The vehicle includes a power supply circuit as described above.

[0168] In an exemplary embodiment, an electronic device is provided, and the electronic device is, for example, a mobile phone, a laptop computer, a tablet computer, a wearable device, etc. The electronic device includes the power supply circuit as described above.

[0169] refer to Fig.11 As shown, electronic device 400 may include one or more of the following components: a processing component 402 , a memory 404 , a power component 406 , a multimedia component 408 , an audio component 410 , an input / output (I / O) interface 412 , a sensor component 414 , and a communication component 416 .

[0170] The processing component 402 generally controls the overall operation of the electronic device 400, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 402 may include one or more processors 420 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 402 may include one or more modules to facilitate the interaction between the processing component 402 and other components. For example, the processing component 402 may include a multimedia module to facilitate the interaction between the multimedia component 408 and the processing component 402.

[0171] The memory 404 is configured to store various types of data to support operations on the electronic device 400. Examples of such data include instructions for any application or method operating on the electronic device 400, contact data, phone book data, messages, pictures, videos, etc. The memory 404 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0172] The power supply component 406 provides power to the various components of the electronic device 400. The power supply component 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the electronic device 400.

[0173] The multimedia component 408 includes a screen that provides an output interface between the electronic device 400 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 408 includes a front camera module and / or a rear camera module. When the electronic device 400 is in an operating mode, such as a shooting mode or a video mode, the front camera module and / or the rear camera module may receive external multimedia data. Each front camera module and the rear camera module may be a fixed optical lens system or have a focal length and optical zoom capability.

[0174] The audio component 410 is configured to output and / or input audio signals. For example, the audio component 410 includes a microphone (MIC), and when the electronic device 400 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 404 or sent via the communication component 416. In some embodiments, the audio component 410 also includes a speaker for outputting audio signals.

[0175] I / O interface 412 provides an interface between processing component 402 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0176] The sensor assembly 414 includes one or more sensors for providing various aspects of status assessment for the electronic device 400. For example, the sensor assembly 414 can detect the open / closed state of the electronic device 400, the relative positioning of components, such as the display and keypad of the electronic device 400, and the sensor assembly 414 can also detect the position change of the electronic device 400 or a component of the electronic device 400, the presence or absence of user contact with the electronic device 400, the orientation or acceleration / deceleration of the electronic device 400, and the temperature change of the electronic device 400. The sensor assembly 414 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 414 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0177] The communication component 416 is configured to facilitate wired or wireless communication between the electronic device 400 and other terminals. The electronic device 400 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 416 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 416 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0178] In an exemplary embodiment, the electronic device 400 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing terminals (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to perform the above-described methods.

[0179] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 404 including instructions, and the above instructions can be executed by the processor 420 of the electronic device 400 to complete the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a tape, a floppy disk, and an optical data storage terminal. When the instructions in the storage medium are executed by the processor of the terminal, the terminal is enabled to perform the method shown in the above embodiment.

[0180] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0181] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0182] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A power supply circuit, characterized in that: The power supply circuit comprises: A plurality of first voltage conversion circuits, each of which includes an inductor, and each of which is capable of supplying power to a load; A switch circuit is coupled to the plurality of first voltage conversion circuits, and the switch circuit is used to connect the inductors in at least two of the first voltage conversion circuits in series to form a second voltage conversion circuit that supplies power to the load.

2. The power supply circuit according to claim 1, characterized in that: The switch circuit comprises: a plurality of first switch units, each of which corresponds to one first voltage conversion circuit, and different first switch units correspond to different first voltage conversion circuits, each of which is coupled between a power supply and the inductor corresponding to the first voltage conversion circuit, or each of which is coupled between the inductor corresponding to the first voltage conversion circuit and the load; At least one second switch unit, each of the second switch units is coupled between two of the inductors, so that the two inductors coupled to the same second switch unit are connected in series.

3. The power supply circuit according to claim 2, characterized in that: The first voltage conversion circuit includes a boost circuit; the first end of the first switch unit is coupled to the first end of the corresponding inductor, and the second end of the first switch unit is used to couple to the power supply.

4. The power supply circuit according to claim 3, characterized in that: The first voltage conversion circuit further includes a third switch unit and a fourth switch unit. In the same first voltage conversion circuit, The first end of the third switch unit is coupled to the second end of the inductor, and the second end of the third switch unit is used to couple to both the first end of the load and the ground end; A first end of the fourth switch unit is coupled to a second end of the inductor, and a second end of the fourth switch unit is used to couple to a second end of the load.

5. The power supply circuit according to claim 4, characterized in that: The first switch unit comprises: A first transistor, wherein a first end of the first transistor is coupled to a first end of the corresponding inductor, and a second end of the first transistor is used to couple to the power supply; The second switch unit comprises: a second transistor, wherein a first terminal of the second transistor is coupled to a second terminal of the inductor of one of the first voltage conversion circuits, and a second terminal of the second transistor is coupled to a first terminal of the inductor of another of the first voltage conversion circuits; The third switch unit comprises: a third transistor, wherein a first end of the third transistor is coupled to a second end of the inductor of the first voltage conversion circuit, and a second end of the third transistor is used to couple to both the first end of the load and the ground end; The fourth switch unit comprises: A fourth transistor, wherein a first end of the fourth transistor is coupled to a second end of the inductor of the first voltage conversion circuit, and a second end of the fourth transistor is used to couple to a second end of the load.

6. The power supply circuit according to claim 4, characterized in that: The first voltage conversion circuit further includes a first filter capacitor. In the same first voltage conversion circuit, The first filter capacitor is coupled between the second end of the corresponding first switch unit and the ground end; The power supply circuit further includes: A second filter capacitor is coupled between a first node formed by coupling the second ends of each of the fourth switch units and the ground end.

7. The power supply circuit according to claim 2, characterized in that: The first voltage conversion circuit includes a step-down circuit; the first end of the first switch unit is coupled to the second end of the corresponding inductor, and the second end of the first switch unit is used to couple to the second end of the load.

8. The power supply circuit according to claim 7, characterized in that: The first voltage conversion circuit further includes a fifth switch unit and a sixth switch unit. In the same first voltage conversion circuit, The first end of the fifth switch unit is coupled to the first end of the inductor, and the second end of the fifth switch unit is used to couple to the power supply; The first end of the sixth switch unit is coupled to the first end of the inductor, and the second end of the sixth switch unit is used to be coupled to both the first end of the load and the ground end.

9. The power supply circuit according to claim 8, characterized in that: The first switch unit comprises: A first transistor, wherein a first terminal of the first transistor is coupled to a second terminal of the corresponding inductor, and a second terminal of the first transistor is used to couple to a second terminal of the load; The second switch unit comprises: a second transistor, wherein a first terminal of the second transistor is coupled to a second terminal of the inductor of one of the first voltage conversion circuits, and a second terminal of the second transistor is coupled to a first terminal of the inductor of another of the first voltage conversion circuits; The fifth switch unit comprises: a fifth transistor, wherein a first end of the fifth transistor is coupled to a first end of the inductor of the first voltage conversion circuit, and a second end of the fifth transistor is used to couple to the power supply; The sixth switch unit comprises: A sixth transistor, wherein a first end of the sixth transistor is coupled to a first end of the inductor of the first voltage conversion circuit, and a second end of the sixth transistor is used to couple to both a first end of the load and the ground end.

10. The power supply circuit according to claim 8, characterized in that: The first voltage conversion circuit further includes a third filter capacitor. In the same first voltage conversion circuit, The third filter capacitor is coupled between the second end of the fifth switch unit and the ground end; The power supply circuit further includes: A fourth filter capacitor is coupled between a second node formed by coupling the second ends of each of the first switch units and the ground terminal.

11. The power supply circuit according to any one of claims 2 to 10, characterized in that: A second switch unit is arranged between each two adjacent first voltage conversion circuits, one end of the second switch unit is coupled to the second end of the inductor in one of the first voltage conversion circuits, and the other end of the second switch unit is coupled to the first end of the inductor in another of the first voltage conversion circuits.

12. A control method for a power supply circuit according to any one of claims 1 to 11, characterized in that: The control method of the power supply circuit comprises: determining a state of the load; The state of the switch circuit is controlled according to the state of the load.

13. The control method of the power supply circuit according to claim 12, characterized in that: The determining the state of the load includes: detecting a current flowing through the load; When the current flowing through the load is less than a preset current, determining that the state of the load is a first state; When the current flowing through the load is greater than or equal to the preset current, the state of the load is determined to be the second state.

14. The control method of the power supply circuit according to claim 12, characterized in that: The first voltage conversion circuit includes a boost circuit; a second switch unit is disposed between each two adjacent first voltage conversion circuits, one end of the second switch unit is coupled to the second end of an inductor in one of the first voltage conversion circuits, and the other end of the second switch unit is coupled to the first end of an inductor in another of the first voltage conversion circuits; and controlling the state of the switch circuit according to the state of the load includes: When the state of the load is the first state, controlling the first switch unit in the first first voltage conversion circuit to be turned on, and controlling the first switch units in the first voltage conversion circuits other than the first first voltage conversion circuit to be turned off; Controlling each of the second switch units to be turned on; When the state of the load is the second state, controlling each of the first switch units to be turned on; Control each of the second switch units to be disconnected.

15. The control method of the power supply circuit according to claim 12, characterized in that: The first voltage conversion circuit includes a step-down circuit; a second switch unit is provided between each two adjacent first voltage conversion circuits, one end of the second switch unit is coupled to the second end of an inductor in one of the first voltage conversion circuits, and the other end of the second switch unit is coupled to the first end of an inductor in another of the first voltage conversion circuits; and controlling the state of the switch circuit according to the state of the load includes: When the state of the load is the first state, controlling the first switch unit in the last first voltage conversion circuit to be turned on, and controlling the first switch units in the first voltage conversion circuits other than the last first voltage conversion circuit to be turned off; Controlling each of the second switch units to be turned on; When the state of the load is the second state, controlling each of the first switch units to be turned on; Control each of the second switch units to be disconnected.

16. The control method of the power supply circuit according to claim 14 or 15, characterized in that: After controlling each of the second switch units to be disconnected, the control method of the power supply circuit further includes: Controlling the third switch units in each of the first voltage conversion circuits to be turned on alternately; or, The fifth switch units in each of the first voltage conversion circuits are controlled to be turned on alternately.

17. A vehicle, characterized in that: The vehicle comprises a power supply circuit as claimed in any one of claims 1 to 11.

18. An electronic device, characterized in that: The electronic device comprises the power supply circuit according to any one of claims 1 to 11.

Images