Power supply and electronic device

Abstract

The present application relates to the technical field of power supplies. Provided in the embodiments of the present application are a power supply and an electronic device, which can improve power supply efficiency in a larger input voltage range. The power supply comprises: a battery input end positive electrode, the battery input end positive electrode being electrically connected to a bus positive electrode by means of a step-down voltage converter circuit; and a control apparatus, the control apparatus being configured to: when a voltage value of the battery input end positive electrode is less than or equal to a first threshold and the voltage value of the battery input end positive electrode is greater than or equal to a second threshold, control the step-down voltage converter circuit to keep the ratio of the voltage value of the bus positive electrode to the voltage value of the battery input end positive electrode unchanged. The control apparatus is further configured to: when the voltage value of the battery input end positive electrode is greater than or equal to the first threshold, control the step-down voltage converter circuit to enable the voltage value of the bus positive electrode to be a first voltage value. The control apparatus is configured to: when the voltage value of the battery input end positive electrode is less than or equal to the second threshold, control the step-down voltage converter circuit to enable the voltage value of the bus positive electrode to be a second voltage value.

Description

Power supply and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202411311449.X, filed on September 19, 2024, and entitled "Power supply and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of power supply, in particular to a power supply and an electronic device. BACKGROUND

[0003] With the development of electronic devices such as notebook computers, higher requirements are put forward for the endurance of electronic devices, and therefore the power supply efficiency has become an important indicator affecting the competitiveness of electronic devices. In order to obtain higher capacity, the batteries in general electronic devices are used in series, so the voltage of the overall battery is high, and needs to be reduced to the voltage required by the load device through a step-down conversion circuit. However, due to the large fluctuation of the voltage of the battery, the voltage required by different load devices is usually within a certain fixed range, so it may lead to insufficient battery power to meet the needs of the load side. For example, the voltage range of the battery is 9-13.5V, and the voltage range required by the load device is 5-6V. The voltage conversion circuit in the form of a switched capacitor works in an open-loop state, and the power conversion efficiency is high, but it can only achieve a voltage conversion of 2 / 1, i.e. converting the battery voltage of 9-13.5V to 4.5-6.75V. It can be seen that the voltage range exceeds the requirements of the load device. Therefore, how to improve the power supply efficiency under the premise of meeting the voltage requirements of the load is a problem to be solved. SUMMARY

[0004] Therefore, the present application provides a power supply and an electronic device, which can improve the power supply efficiency under the premise of meeting the voltage requirements of the load.

[0005] In a first aspect, the embodiments of the present application provide a power supply, comprising: a battery input positive electrode; the battery input positive electrode is electrically connected to a bus positive electrode through a step-down voltage conversion circuit; a control device, the control device is used to control the step-down voltage conversion circuit to keep the ratio of the voltage value of the bus positive electrode to the voltage value of the battery input positive electrode unchanged when the voltage value of the battery input positive electrode is less than or equal to a first threshold value and the voltage value of the battery input positive electrode is greater than or equal to a second threshold value, the second threshold value is less than the first threshold value; the control device is also used to control the step-down voltage conversion circuit to make the voltage value of the bus positive electrode be a first voltage value when the voltage value of the battery input positive electrode is greater than or equal to the first threshold value; the control device is also used to control the step-down voltage conversion circuit to make the voltage value of the bus positive electrode be a second voltage value when the voltage value of the battery input positive electrode is less than or equal to the second threshold value.

[0006] The power supply in the embodiments of the present application, when the voltage value of the positive pole of the battery input end is less than or equal to the first threshold value, the voltage value ratio of the positive pole of the bus to the positive pole of the battery input end is kept unchanged by controlling the buck voltage conversion circuit, that is, working in an open loop state. Through the open loop control of the buck voltage conversion circuit, the buck voltage conversion circuit has a higher power conversion efficiency. When the voltage value of the positive pole of the battery input end is greater than the first threshold value, the voltage value of the positive pole of the bus is the first voltage value by controlling the buck voltage conversion circuit, that is, working in a closed loop state. When the voltage value of the positive pole of the battery input end is less than the second threshold value, the voltage value of the positive pole of the bus is the second voltage value by controlling the buck voltage conversion circuit, that is, working in another closed loop state. In the two closed loop states, the voltage value of the positive pole of the bus will not exceed the first voltage value and the second voltage value, that is, the voltage of the positive pole of the bus can be kept in the voltage range required by the load within a larger input voltage range, to adapt to the needs of the load and avoid the voltage fluctuation of the bus exceeding the voltage demand of the load, thereby reducing the power conversion efficiency of the voltage conversion circuit on the load branch, that is, improving the power supply efficiency on the premise of meeting the voltage demand of the load.

[0007] In some possible embodiments, the buck voltage conversion circuit is an n-level buck voltage conversion circuit, n≥3, and different levels of buck circuits can realize different proportions of open loop control.

[0008] In some possible implementation manners, n=3, the power supply further includes a battery input negative pole, the step-down voltage conversion circuit includes: a first switch device, a second switch device, a third switch device and a fourth switch device connected in series between the battery input positive pole and the battery input negative pole; a flying capacitor, a first end of the flying capacitor being electrically connected to a connection node between the first switch device and the second switch device, a second end of the flying capacitor being electrically connected to a connection node between the third switch device and the fourth switch device; an inductor, a first end of the inductor being electrically connected to a connection node between the second switch device and the third switch device, a second end of the inductor being electrically connected to the bus positive pole; an output capacitor, a first end of the output capacitor being electrically connected to the bus positive pole, a second end of the output capacitor being electrically connected to the battery input negative pole; the control device is specifically configured to: control the switching timing of the first switch device and the fourth switch device to be complementary, control the switching timing of the second switch device and the third switch device to be complementary, and control the phase shift angle of the switching timing of the first switch device and the second switch device to be 180°; the control device is specifically configured to: when the voltage value of the battery input positive pole is less than or equal to a first threshold value and the voltage value of the battery input positive pole is greater than or equal to a second threshold value, control the switching duty ratio of the first switch device and the second switch device to be equal to 0.5; the control device is specifically configured to: when the voltage value of the battery input positive pole is greater than the first threshold value, control the switching duty ratio of the first switch device and the second switch device to be less than 0.5, and control the switching duty ratio to be negatively correlated with the voltage value of the battery input positive pole; the control device is specifically configured to: when the voltage value of the battery input positive pole is less than the second threshold value, control the switching duty ratio of the first switch device and the second switch device to be greater than 0.5, and control the switching duty ratio to be negatively correlated with the voltage value of the battery input positive pole. In the open-loop control process, the inductor actually plays the role of a resistor, and the ripple current of the inductor is zero. In this process, the magnetic loss and the alternating current copper loss of the inductor are not generated, and only the direct current copper loss of the inductor is increased, so that the step-down voltage conversion circuit can have a higher power conversion efficiency.

[0009] In some possible implementation manners, the voltage value of the flying capacitor is equal to half of the voltage value of the battery input positive pole.

[0010] In some possible implementation manners, the power supply further includes a battery input negative pole, and the step-down voltage conversion circuit includes: a first switching device, a second switching device, a third switching device and a fourth switching device connected in series between the battery input positive pole and the battery input negative pole in sequence, a connection node between the second switching device and the third switching device being electrically connected to the bus positive pole; a resonance capacitor, a first end of the resonance capacitor being electrically connected to the connection node between the first switching device and the second switching device; a resonance inductor, a first end of the resonance inductor being electrically connected to a second end of the resonance capacitor, and a second end of the resonance inductor being electrically connected to the connection node between the second switching device and the third switching device; and an output capacitor, a first end of the output capacitor being electrically connected to the bus positive pole, and a second end of the output capacitor being electrically connected to the battery input negative pole; the control device is specifically configured to control switching time sequences of the first switching device and the second switching device to be complementary, and switching time sequences of the third switching device and the fourth switching device to be complementary; the control device is specifically configured to, when a voltage value of the battery input positive pole is less than or equal to a first threshold value and the voltage value of the battery input positive pole is greater than or equal to a second threshold value, keep a ratio of the voltage value of the bus positive pole to the voltage value of the battery input positive pole unchanged by adjusting at least one of a switching frequency, a switching duty ratio and a phase shift angle, the switching frequency including switching frequencies of the first switching device, the second switching device, the third switching device and the fourth switching device, the switching duty ratio being a switching duty ratio of the first switching device and the third switching device, and the phase shift angle being a phase shift angle of the switching time sequences of the first switching device and the third switching device; the control device is specifically configured to, when the voltage value of the battery input positive pole is greater than the first threshold value, make the voltage value of the bus positive pole a first voltage value by adjusting at least one of the switching frequency, the switching duty ratio and the phase shift angle; and the control device is further configured to, when the voltage value of the battery input positive pole is less than the second threshold value, make the voltage value of the bus positive pole a second voltage value by adjusting at least one of the switching frequency, the switching duty ratio and the phase shift angle. The step-down voltage conversion circuit can be implemented by using a resonance switching capacitor topology.

[0011] In some possible implementation manners, the power supply further includes a battery input negative pole, and the step-down voltage conversion circuit includes: a first switch device and a second switch device connected in series between the battery input positive pole and the battery input negative pole; an inductor, a first end of the inductor being electrically connected to a connection node between the first switch device and the second switch device, and a second end of the inductor being electrically connected to the bus positive pole; an output capacitor, a first end of the output capacitor being electrically connected to the bus positive pole, and a second end of the output capacitor being electrically connected to the battery input negative pole; and the control device is specifically configured to: control switching time sequences of the first switch device and the second switch device to be complementary; when the voltage value of the battery input positive pole is less than or equal to a first threshold value and the voltage value of the battery input positive pole is greater than or equal to a second threshold value, control a switching duty cycle of the first switch device to be equal to a, and 1>a>0; when the voltage value of the battery input positive pole is greater than the first threshold value, control the switching duty cycle of the first switch device to be less than a, and control the switching duty cycle to be negatively related to the voltage value of the battery input positive pole; and when the voltage value of the battery input positive pole is less than the second threshold value, control the switching duty cycle of the first switch device to be greater than a, and control the switching duty cycle to be negatively related to the voltage value of the battery input positive pole.

[0012] In some possible implementation manners, the power supply further includes a battery input negative pole, and the step-down voltage conversion circuit includes: a first switch device, a first end of the first switch device being electrically connected to the battery input positive pole; an inductor, a first end of the inductor being electrically connected to a second end of the first switch device, and a second end of the inductor being electrically connected to the bus positive pole; a second switch device, a first end of the second switch device being electrically connected to a center tap of the inductor, and a second end of the second switch device being electrically connected to the battery input negative pole; and an output capacitor, a first end of the output capacitor being electrically connected to the bus positive pole, and a second end of the output capacitor being electrically connected to the battery input negative pole; and the control device is specifically configured to: control switching time sequences of the first switch device and the second switch device to be complementary; when the voltage value of the battery input positive pole is less than or equal to a first threshold value and the voltage value of the battery input positive pole is greater than or equal to a second threshold value, control a switching duty cycle of the first switch device to be equal to b, and 1>b>0; when the voltage value of the battery input positive pole is greater than the first threshold value, control the switching duty cycle of the first switch device to be less than b, and control the switching duty cycle to be negatively related to the voltage value of the battery input positive pole; and when the voltage value of the battery input positive pole is less than the second threshold value, control the switching duty cycle of the first switch device to be greater than b, and control the switching duty cycle to be negatively related to the voltage value of the battery input positive pole.

[0013] In some possible implementation manners, the power supply further includes a power supply interface; a bidirectional voltage conversion circuit, the power supply interface being electrically connected to the positive pole of the battery input end through the bidirectional voltage conversion circuit; a first load power supply end; a first voltage conversion circuit, the positive pole of the bus being electrically connected to the first load power supply end through the first voltage conversion circuit; a second load power supply end; a second voltage conversion circuit, the positive pole of the bus being electrically connected to the second load power supply end through the second voltage conversion circuit; and the first load power supply end and the second load power supply end are any two of the following items: a processor power supply end, a screen power supply end, a memory power supply end, a TypeC interface power supply end, and a power amplifier power supply end.

[0014] In some possible implementation manners, the first threshold value is 12V, and the second threshold value is 10V.

[0015] In a second aspect, an electronic device is provided, including the power supply described above. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] FIG. 1 is a structural schematic diagram of a power supply in the related art;

[0018] FIG. 2 is a structural schematic diagram of another power supply in the related art;

[0019] FIG. 3 is a structural schematic diagram of a power supply in an embodiment of the present application;

[0020] FIG. 4 is a control process schematic diagram corresponding to FIG. 3;

[0021] FIG. 5 is a switch timing diagram in an open-loop control process corresponding to FIG. 3;

[0022] FIG. 6 is a control process schematic diagram corresponding to FIG. 5;

[0023] FIG. 7 is a switch timing diagram in a closed-loop control process corresponding to FIG. 3;

[0024] FIG. 8 is a control process schematic diagram corresponding to FIG. 7;

[0025] FIG. 9 is a switch timing diagram in another closed-loop control process corresponding to FIG. 3;

[0026] FIG. 10 is a control process schematic diagram corresponding to FIG. 9;

[0027] FIG. 11 is a structural schematic diagram of another power supply in an embodiment of the present application;

[0028] Fig. 12 is a schematic diagram of another power supply structure in the embodiments of the present application;

[0029] Fig. 13 is a switching timing diagram in an open-loop control process corresponding to Fig. 12;

[0030] Fig. 14 is a switching timing diagram in a closed-loop control process corresponding to Fig. 12;

[0031] Fig. 15 is a switching timing diagram in another closed-loop control process corresponding to Fig. 12;

[0032] Fig. 16 is a schematic diagram of another power supply structure in the embodiments of the present application;

[0033] Fig. 17 is a switching timing diagram in a closed-loop control process corresponding to Fig. 16;

[0034] Fig. 18 is a schematic diagram of another power supply structure in the embodiments of the present application;

[0035] Fig. 19 is a schematic diagram of an application scenario of a power supply in the embodiments of the present application;

[0036] Fig. 20 is a schematic diagram of an application scenario of a power supply in the embodiments of the present application;

[0037] Fig. 21 is a structural block diagram of an electronic device in the embodiments of the present application. DETAILED DESCRIPTION

[0038] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0039] It should be clear that the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0040] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0041] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0042] Before the embodiments of the present application are introduced, the related art and its technical problems are first described.

[0043] As shown in FIG. 1, in an electronic device, a power supply interface is used to connect an external power supply, a charger has a bidirectional voltage conversion function of buck and boost, which is used to charge a battery after voltage conversion of the external power supply, and the battery supplies power to load devices on each branch through a bus, the load devices include, for example, a central processing unit (CPU), a screen, a memory, a Type-C interface, a power amplifier (PA), and the like, each load device is electrically connected to the bus through a corresponding voltage converter, and the voltage converter of the CPU is an Intel mobile voltage positioning (IMVP). On the one hand, the battery can be composed of a plurality of single batteries connected in series, and since the number of battery strings is not uniform, the bus voltage range is large, and the voltages required by the load devices are different, and the large bus voltage range will result in low efficiency of the voltage converter.

[0044] As shown in FIG. 2, assuming that in the scenario of the bus of 12V supplying power to two loads, load 1 needs a supply voltage of 0.8V, and load 2 needs a supply voltage of 3.3V, the first buck conversion circuit buck1 needs to convert 12V to 0.8V, and the second buck conversion circuit buck2 needs to convert 12V to 3.3V, since the voltage conversion drop of the two voltage conversion circuits is large, the working efficiency is low. If a 1 / 2 fixed buck ratio charge pump is added between the bus of 12V and the two load branches, the charge pump includes four switching devices, a flying capacitor Cfly and an output capacitor Co. The input end of the charge pump is electrically connected to the battery, and the output end is electrically connected to the input end of the two voltage conversion circuits, and the charge pump works in an open loop mode, which can convert 12V to 6V. The first buck conversion circuit buck1 needs to convert 6V to 0.8V, and the second buck conversion circuit buck2 needs to convert 6V to 3.3V, so that the bus voltage is reduced, the voltage conversion drop of the two voltage conversion circuits is small, and the working efficiency is improved. However, since the charge pump works in an open loop mode, it can only achieve 1 / 2 voltage conversion, therefore, when the bus voltage rises to more than 12V, it exceeds the load voltage requirement, which will cause the input voltage of the first buck conversion circuit buck1 and the second buck conversion circuit buck2 to increase, thereby reducing the power conversion efficiency.

[0045] The embodiments of the present application can solve the above problems, and the embodiments of the present application are described below.

[0046] As shown in FIG. 3, the embodiment of the present application provides a power supply, comprising: a battery input positive terminal in+ for electrically connecting a battery positive terminal; the battery input positive terminal in+ is electrically connected to a bus positive terminal bus+ through a step-down voltage conversion circuit 1, that is, an input terminal of the step-down voltage conversion circuit 1 is electrically connected to the battery input positive terminal in+. An output terminal of the step-down voltage conversion circuit 1 is electrically connected to the bus positive terminal bus+. The bus positive terminal bus+ is used for connecting a load branch, and the load branch has a load and a corresponding voltage conversion circuit, and the load is electrically connected to the bus positive terminal bus+ through the voltage conversion circuit on the load branch. That is, the step-down voltage conversion circuit 1 is used for outputting the battery voltage after voltage conversion to the bus positive terminal bus+ so as to convert the bus positive voltage Vbus+ to the voltage required by the load by the voltage conversion circuit on the load branch to supply power to the load.

[0047] The power supply further comprises a control device 2, as shown in FIG. 4, which is used for controlling the step-down voltage conversion circuit 1 to keep the ratio of the voltage value Vbus+ of the bus positive terminal bus+ to the voltage value Vin+ of the battery input positive terminal in+ unchanged when the voltage value Vin+ of the battery input positive terminal in+ is less than or equal to a first threshold value Vt1 and the voltage value Vin+ of the battery input positive terminal in+ is greater than or equal to a second threshold value Vt2. For example, Vt1=12V and Vt2=10V, and it is assumed that the ratio of Vbus+ to Vin+ is 1 / 2, that is, when 10V≤Vin+≤12V, the step-down voltage conversion circuit 1 outputs 1 / 2Vin+ to the bus positive terminal bus+.

[0048] It is assumed that the voltage conversion circuit on the load branch has a high efficiency in the bus positive voltage range of 5-6V. When Vin+=12V, the step-down voltage conversion circuit 1 outputs 6V to the bus positive terminal bus+; when Vin+=11V, the step-down voltage conversion circuit 1 outputs 5.5V to the bus positive terminal bus+; and when Vin+=10V, the step-down voltage conversion circuit 1 outputs 5V to the bus positive terminal bus+. When 10V≤Vin+≤12V, the process of controlling the step-down voltage conversion circuit 1 to keep the ratio of the voltage value Vbus+ of the bus positive terminal bus+ to the voltage value Vin+ of the battery input positive terminal in+ unchanged is open-loop control, which can make the step-down voltage conversion circuit 1 have a high power conversion efficiency, and at the same time, since the bus positive voltage Vbus+ can be ensured to be in the range of 5-6V when 10V≤Vin+≤12V, it will not exceed the requirement of the load, so that the voltage conversion circuit on the load branch also has a high efficiency.

[0049] The control device 2 is also configured to control the step-down voltage conversion circuit 1 to make the voltage value Vbus+ of the bus positive pole bus+ be a first voltage value V1, for example V1=6V, when the voltage value Vin+ of the battery input positive pole in+ is greater than or equal to a first threshold value Vt1, that is, when Vin+≥6V, the control device 2 controls the step-down voltage conversion circuit 1 to output 6V to the bus positive pole bus+. When Vin+=12V, the step-down voltage conversion circuit 1 outputs 6V to the bus positive pole bus+; when Vin+=13V, the step-down voltage conversion circuit 1 outputs 6V to the bus positive pole bus+; when Vin+=14V, the step-down voltage conversion circuit 1 outputs 6V to the bus positive pole bus+. When Vin+≥12V, the process of controlling the step-down voltage conversion circuit 1 to make the voltage value Vbus+ of the bus positive pole bus+ be 6V is a closed-loop control process, and the bus positive pole voltage Vbus+ can be kept in the required 6V voltage range within a large input voltage range, so as to adapt to the needs of the load and avoid a large bus voltage range to reduce the power conversion efficiency of the voltage conversion circuit on the load branch.

[0050] The control device 2 is also configured to control the step-down voltage conversion circuit 1 to make the voltage value Vbus+ of the bus positive pole bus+ be a second voltage value V2, for example V2=5V, when the voltage value Vin+ of the battery input positive pole in+ is less than or equal to a second threshold value Vt2. For example, when Vin+=10V, Vbus+=5V, when Vin+=9V, Vbus+=5V, and when Vin+=8.5V, Vbus+=5V. When Vin+≤10V, making Vbus+=5V is a closed-loop control process, which can avoid the problem that the bus voltage cannot meet the needs of the load when the battery voltage decreases, thereby expanding the battery voltage range, that is, the power supply can adapt to a larger battery voltage range, and open-loop control can be realized in the voltage range between Vt1 and Vt2 on this basis to improve the power conversion efficiency as much as possible.

[0051] Specifically, for example, the load branch includes a first load and a second load, the first load is electrically connected to the bus positive pole bus+ through a first voltage conversion circuit, and the second load is electrically connected to the bus positive pole bus+ through a second voltage conversion circuit, the first voltage conversion circuit is configured to convert the bus positive pole voltage Vbus+ to 0.8V, and the second voltage conversion circuit is configured to convert the bus positive pole voltage Vbus+ to 3.3V. In the embodiment of the present application, the bus positive pole voltage Vbus+ can be controlled to be within the range of 5-6V, so that the first voltage conversion circuit and the second voltage conversion circuit do not need to perform voltage conversion in a large voltage range, thereby improving the power conversion efficiency.

[0052] The power supply in the embodiments of the present application, when the voltage value of the positive pole of the battery input end is less than or equal to the first threshold value, the voltage value ratio of the positive pole of the bus to the positive pole of the battery input end is kept unchanged by controlling the step-down voltage conversion circuit, i.e. working in an open loop state. The step-down voltage conversion circuit has a high power conversion efficiency by open loop control. When the voltage value of the positive pole of the battery input end is greater than the first threshold value, the voltage value of the positive pole of the bus is the first voltage value by controlling the step-down voltage conversion circuit, i.e. working in a closed loop state. When the voltage value of the positive pole of the battery input end is less than the second threshold value, the voltage value of the positive pole of the bus is the second voltage value by controlling the step-down voltage conversion circuit, i.e. working in another closed loop state. In the two closed loop states, the voltage value of the positive pole of the bus will not exceed the first voltage value and the second voltage value, i.e. the voltage of the positive pole of the bus can be kept in the voltage range required by the load in a large input voltage range, so as to meet the needs of the load and avoid large voltage fluctuation of the bus exceeding the voltage requirement of the load, thereby reducing the power conversion efficiency of the voltage conversion circuit in the load branch, i.e. improving the power supply efficiency under the premise of meeting the voltage requirement of the load.

[0053] In some possible embodiments, the step-down voltage conversion circuit is an n-level step-down voltage conversion circuit, n≥3. For example, the step-down voltage conversion circuit 1 shown in FIG. 3 is a 3-level step-down voltage conversion circuit.

[0054] In some possible implementation manners, as shown in FIG. 3, n=3, the power supply further includes a battery input negative terminal in-, the step-down voltage conversion circuit 1 includes: a first switching device Q1, a second switching device Q2, a third switching device Q3 and a fourth switching device Q4 connected in series between a battery input positive terminal in+ and the battery input negative terminal in- in sequence, each switching device may be, for example, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or the like, the switching device is a three-terminal device, including a first terminal, a second terminal and a control terminal, the signal of the control terminal can control the conduction and the cutoff between the first terminal and the second terminal to realize the switching function, and the series connection herein refers to the first terminal and the second terminal of each switching device being connected in sequence. It can be understood that devices capable of realizing the switching function can all be referred to as switching devices, for example, two MOSFETs connected in series as a switching device, and the like. The step-down voltage conversion circuit 1 further includes a flying capacitor Cfly, a first terminal of the flying capacitor Cfly is electrically connected to a connection node A between the first switching device Q1 and the second switching device Q2, a second terminal of the flying capacitor Cfly is electrically connected to a connection node B between the third switching device Q3 and the fourth switching device Q4, and a voltage Vc of the flying capacitor Cfly is equal to 1 / 2 Vin+. The step-down voltage conversion circuit 1 further includes an inductor L, a first terminal of the inductor L is electrically connected to a connection node C between the second switching device Q2 and the third switching device Q3, and a second terminal of the inductor L is electrically connected to the bus positive terminal bus+. The step-down voltage conversion circuit 1 further includes an output capacitor Co, a first terminal of the output capacitor Co is electrically connected to the bus positive terminal bus+, and a second terminal of the output capacitor Co is electrically connected to the battery input negative terminal bus-. The control device 2 is electrically connected to the control terminals of the first switching device Q1, the second switching device Q2, the third switching device Q3 and the fourth switching device Q4, and the control device 2 controls the conduction and the cutoff of each switching device by providing a Pulse Width Modulation wave (PWM) signal to the control terminal of each switching device, each switching device switches between the conduction state and the cutoff state. The switching duty ratio of the switching device is the ratio of the conduction time to the cycle time. As shown in FIG. 5, FIG. 5 shows the switching timing of the switching devices Q1-Q4, the voltage vL across the inductor L and the direct current value iL of the inductor L, and the switching timing shown in FIG. 6 is the voltage of the control terminal of each switching device, the high level indicates that the corresponding switching device is in conduction, and the low level indicates that the corresponding switching device is in cutoff.It can be understood that the switch device can also be a P-type MOSFET, for which a low level indicates that the corresponding switch device is turned on, and a high level indicates that the corresponding switch device is turned off. In the embodiments of the present application, the switching sequence in which a high level indicates that the switch device is turned on and a low level indicates that the switch device is turned off is illustrated and described. The control device 2 is specifically configured to control the switching sequence of the first switch device Q1 and the fourth switch device Q2 to be complementary, that is, when the first switch device Q1 is turned on, the second switch device Q2 is turned off, and when the first switch device Q1 is turned off, the second switch device Q2 is turned on. The switching sequence of the second switch device Q2 and the third switch device Q3 is controlled to be complementary, that is, when the second switch device Q2 is turned on, the third switch device Q3 is turned off, and when the second switch device Q2 is turned off, the third switch device Q3 is turned on. The phase shift angle of the switching sequence of the first switch device Q1 and the second switch device Q2 is 180°.

[0055] As shown in FIGS. 5 and 6, the control device 2 is specifically configured to control the switching duty cycle D of the first switch device Q1 and the second switch device Q2 to be equal to 0.5 when the voltage value Vin+ of the positive electrode in+ of the battery input end is less than or equal to the first threshold value Vt1 and the voltage value Vin+ of the positive electrode in+ of the battery input end is greater than or equal to the second threshold value Vt2, for example, 10V≤Vin+≤12V. When the switching duty cycle D of the first switch device Q1 and the second switch device Q2 is 0.5, the step-down voltage conversion circuit 1 works in multiple periods, and each period includes a first time period t1 and a second time period t2. In the first time period t1, the first switch device Q1 and the third switch device Q3 are turned on, and the second switch device Q2 and the fourth switch device Q4 are turned off, and the battery charges the flying capacitor Cfly. In the second time period t2, the first switch device Q1 and the third switch device Q3 are turned off, and the second switch device Q2 and the fourth switch device Q4 are turned on, and the flying capacitor Cfly is discharged. The flying capacitor voltage Vc=Vin+ / 2, and the output voltage Vo=Vin+ / 2, that is, the bus positive voltage Vbus+. The arrow in FIG. 6 indicates the current flow direction. In the process of alternation of the first time period t1 and the second time period t2, the voltage vL across the inductor L is 0V, that is, the direct current flows through the inductor L, and the direct current value iL of the inductor L is the output current value iout of the step-down voltage conversion circuit 1, that is, the load current value. The inductor L actually functions as a resistor, and the ripple current of the inductor L is zero. In this process, the magnetic loss and the alternating current copper loss of the inductor L are not generated, and only the direct current copper loss of the inductor L is increased, so that the step-down voltage conversion circuit 1 can have a higher power conversion efficiency.

[0056] As shown in FIG. 7 and FIG. 8, the control device 2 is specifically configured to, when the voltage value Vin+ of the battery input positive electrode in+ is greater than the first threshold value Vt1, for example, Vin+>12V, control the switching duty cycle D of the first switching device Q1 and the second switching device Q2 to be less than 0.5, and control the switching duty cycle D to be negatively correlated with the voltage value Vin+ of the battery input positive electrode in+, that is, the greater Vin+, the smaller D. In the timing shown in FIG. 7, only D=0.25 is taken as an example for description. The step-down type conversion circuit conversion circuit 1 also works periodically, and each period includes a first time period t1, a second time period t2, a third time period t3 and a fourth time period t4 in turn. In the first time period t1, the first switching device Q1 and the third switching device Q3 are turned on, the second switching device Q2 and the fourth switching device Q4 are turned off, the battery charges the flying capacitor Cfly to the flying capacitor voltage Vc=Vin+ / 2, the output voltage Vo<Vin+ / 2, the inductor L is charged, the inductor current iL gradually rises, and the voltage across the inductor vL=Vin+ / 2-Vo. In the second time period t2, the first switching device Q1 and the second switching device Q2 are turned off, the third switching device Q3 and the fourth switching device Q4 are turned on, the inductor current iL gradually decreases, and the voltage across the inductor vL=-Vo. In the third time period t3, the first switching device Q1 and the third switching device Q3 are turned off, the second switching device Q2 and the fourth switching device Q4 are turned on, the flying capacitor Cfly charges the inductor L, the inductor current iL gradually rises, the voltage across the inductor vL=Vin+ / 2-Vo, and the output voltage Vo<Vin+ / 2. In the fourth time period t4, the first switching device Q1 and the second switching device Q2 are turned off, the third switching device Q3 and the fourth switching device Q4 are turned on, and similar to the second time period t2, the inductor current iL gradually decreases. Repeating the four time periods keeps the output voltage Vo<Vin+ / 2, Vo / Vin+=D, and by controlling D to be negatively correlated with Vin+, the output voltage Vo=V1=6V can be kept. The process of D<0.5 is a closed-loop control process, in which the inductor L ripple current frequency is 2 times the switching frequency, the inductor current DC component is equal to the load current size, the AC component is related to D, the more D deviates from 50%, the larger the AC component, and the larger the corresponding magnetic loss and AC copper loss. Therefore, when designing, the narrower the voltage regulation range, the smaller the range of D deviating from 50%, the smaller the inductance required, and the smaller the inductance loss and the higher the conversion efficiency.

[0057] As shown in FIG. 9 and FIG. 10, the control device 2 is specifically configured to control the switching duty cycle D of the first switching device Q1 and the second switching device Q2 to be greater than 0.5 when the voltage value Vin+ of the positive electrode in+ of the battery is less than the second threshold value Vt2. In the timing diagram shown in FIG. 9, only the case of D = 0.75 is taken as an example for illustration. The step-down circuit conversion circuit 1 also operates periodically, and each period includes a first time period t1, a second time period t2, a third time period t3 and a fourth time period t4 in turn. In the first time period t1, the first switching device Q1 and the second switching device Q2 are turned on, the third switching device Q3 and the fourth switching device Q4 are turned off, the inductor L is charged, the inductor current iL gradually rises, and the voltage vL across the inductor is Vin+ - Vo. In the second time period t2, the first switching device Q1 and the third switching device Q3 are turned on, the second switching device Q2 and the fourth switching device Q4 are turned off, the battery charges the flying capacitor Cfly, the inductor current iL gradually decreases, and the voltage vL across the inductor is -Vin+ / 2 - Vo. In the third time period t3, the first switching device Q1 and the second switching device Q2 are turned on, the third switching device Q3 and the fourth switching device Q4 are turned off, the inductor L is charged, the inductor current iL gradually rises, and the voltage vL across the inductor is Vin+ - Vo. In the fourth time period t4, the first switching device Q1 and the third switching device Q3 are turned off, the second switching device Q2 and the fourth switching device Q4 are turned on, the inductor current iL gradually decreases, and the voltage vL across the inductor is -Vin+ / 2 - Vo. The four time periods are repeated to keep the output voltage Vo > Vin+ / 2, Vo / Vin+ = D, and by controlling D to be negatively related to Vin+, the output voltage Vo = V2 = 5V can be maintained. The process of D > 0.5 is also a closed-loop control process, in which the inductor L has a ripple current frequency that is twice the switching frequency, the direct current component of the inductor current is equal to the size of the load current, the alternating current component is related to D, and the greater the deviation of D from 50%, the greater the alternating current component, and the greater the magnetic loss and alternating current copper loss. Therefore, when designing, it is desirable to have a narrower voltage regulation range, so that the range of deviation of D from 50% is smaller, the inductance required is smaller, the inductance loss is smaller, and the conversion efficiency is higher.

[0058] Fig. 5 and Fig. 6 illustrate the control process of 10V≤Vin+≤12V in Fig. 4, Fig. 7 and Fig. 8 illustrate the control process of Vin+>12V in Fig. 4, and Fig. 9 and Fig. 10 illustrate the control process of Vin+<10V in Fig. 4. Taking the example of the bus positive pole bus+ requiring 5V-6V voltage, when the voltage value Vin+ of the battery input positive pole in+ is between 10V and 12V, the ratio of the voltage value Vbus+ of the bus positive pole bus+ to the voltage value Vin+ of the battery input positive pole in+ can be kept at 1 / 2 through open-loop control, so that the step-down voltage conversion circuit 1 has a higher power conversion efficiency on the basis of meeting the bus positive pole voltage requirement; when the voltage value Vin+ of the battery input positive pole in+ is greater than 12V, the voltage value Vbus+ of the bus positive pole bus+ can be kept at 6V through closed-loop control to meet the bus positive pole voltage requirement; when the voltage value Vin+ of the battery input positive pole in+ is less than 10V, the voltage value Vbus+ of the bus positive pole bus+ can be kept at 5V through closed-loop control to meet the bus positive pole voltage requirement.

[0059] It should be noted that the topology structure of the step-down voltage conversion circuit 1 shown in Fig. 3 is only an example, and the embodiments of the present application do not limit the topology structure of the step-down voltage conversion circuit 1, as long as the control process shown in Fig. 4 can be implemented.

[0060] The topology structure of the step-down voltage conversion circuit 1 shown in Fig. 3 is 3-level buck, and the ratio of the voltage value Vbus+ of the bus positive pole bus+ to the voltage value Vin+ of the battery input positive pole in+ can be kept at 1 / 2 in the open-loop control process. In other topology structures, the ratio of the voltage value Vbus+ of the bus positive pole bus+ to the voltage value Vin+ of the battery input positive pole in+ can also be kept at 1 / 3, 1 / 4 or other ratios in the open-loop control process. As shown in Fig. 11, the step-down voltage conversion circuit 1 is m+1-level buck, m is an integer greater than or equal to 2, and m=2, i.e. 3-level buck. In the open-loop control process, Vo=(1 / m)×Vin+, that is, the ratio of the voltage value Vbus+ of the bus positive pole bus+ to the voltage value Vin+ of the battery input positive pole in+ can be kept at 1 / m in the open-loop control process. When m=3, i.e. 4-level buck, the ratio of the voltage value Vbus+ of the bus positive pole bus+ to the voltage value Vin+ of the battery input positive pole in+ can be kept at 1 / 3 in the open-loop control process; similarly, when m=4, i.e. 5-level buck, the ratio of the voltage value Vbus+ of the bus positive pole bus+ to the voltage value Vin+ of the battery input positive pole in+ can be kept at 1 / 4 in the open-loop control process. The specific control process and principle will not be described again.

[0061] In some embodiments, as shown in FIG. 12, the buck voltage conversion circuit 1 can be a resonant switched capacitor voltage conversion circuit, and the power supply further includes a battery input negative terminal bus-; the buck voltage conversion circuit 1 includes: a first switching device Q1, a second switching device Q2, a third switching device Q3 and a fourth switching device Q4 connected in series between a battery input positive terminal in+ and the battery input negative terminal in-; a connection node C between the second switching device Q2 and the third switching device Q3 is electrically connected to the bus positive terminal bus+; a resonant capacitor Cr, a first end of the resonant capacitor Cr is electrically connected to a connection node A between the first switching device Q1 and the second switching device Q2; a resonant inductor Lr, a first end of the resonant inductor Lr is electrically connected to a second end of the resonant capacitor Cr, and a second end of the resonant inductor Lr is electrically connected to a connection node B between the second switching device Q2 and the third switching device Q3; an output capacitor Co, a first end of the output capacitor Co is electrically connected to the bus positive terminal bus+, and a second end of the output capacitor Co is electrically connected to the battery input negative terminal bus-. As shown in FIG. 13, the control device 2 is specifically configured to control the switching timing of the first switching device Q1 and the second switching device Q2 to be complementary, and the switching timing of the third switching device Q3 and the fourth switching device Q4 to be complementary.

[0062] As shown in FIG. 13, the control device 2 is specifically configured to, when the voltage value Vin+ of the battery input positive terminal in+ is less than or equal to a first threshold value Vt1, and the voltage value Vin+ of the battery input positive terminal in+ is greater than or equal to a second threshold value vt2, keep the ratio of the voltage value Vbus+ of the bus positive terminal bus+ to the voltage value Vin+ of the battery input positive terminal in+ unchanged by adjusting at least one of a switching frequency, a switching duty cycle D and a phase shift angle of the first switching device Q1 and the third switching device Q3, the switching frequency including the switching frequencies of the first switching device Q1, the second switching device Q2, the third switching device Q3 and the fourth switching device Q4, the switching duty cycle D being the switching duty cycle of the first switching device Q1 and the third switching device Q3, and the phase shift angle being the phase shift angle of the switching timing of the first switching device Q1 and the third switching device Q3.

[0063] As shown in FIG. 14, the control device 2 is specifically configured to, when the voltage value Vin+ of the battery input positive terminal in+ is greater than the first threshold value Vt1, make the voltage value Vbus+ of the bus positive terminal bus+ be a first voltage value V1 by adjusting at least one of the switching frequency, the switching duty cycle and the phase shift angle.

[0064] As shown in FIG. 15, the control device 2 is further configured to, when the voltage value of the battery input positive terminal in+ is less than the second threshold value Vt2, make the voltage value Vbus+ of the bus positive terminal bus+ be a second voltage value V2 by adjusting at least one of the switching frequency, the switching duty cycle and the phase shift angle.

[0065] The timing shown in FIGS. 13-15 can be used to implement the control process shown in FIG. 4. For example, the phase shift angle in FIG. 13 is The phase shift angle in FIG. 14 is The phase shift angle in FIG. 15 is It should be noted that FIGS. 13-15 only show three cases of different phase shift angles, and in fact, the specific control process of the three scenarios is related to the switching frequency, the switching duty cycle and the phase shift angle. By controlling these parameters, the relationship between the voltage value Vbus+ of the bus positive bus+ and the voltage value Vin+ of the battery input positive in+ can be controlled, the smaller the voltage adjustment range, the closer to the resonance point, the higher the efficiency. Narrow closed-loop control means that the closed-loop control range of Vin+> Vt1 and Vin+< Vt2 is narrow, and relatively, the open-loop control range of Vt2≤Vin+≤Vt1 is wide, that is, it is beneficial to improve the efficiency of electric energy conversion.

[0066] In some embodiments, as shown in FIG. 16, the power supply further includes a battery input negative in-, and the step-down voltage conversion circuit 1 includes: a first switching device Q1 and a second switching device Q2 connected in series between the battery input positive in+ and the battery input negative in-; an inductor L, a first end of the inductor L is electrically connected to a connection node A between the first switching device Q1 and the second switching device Q2, and a second end of the inductor L is electrically connected to the bus positive bus+; an output capacitor Co, a first end of the output capacitor Co is electrically connected to the bus positive bus+, and a second end of the output capacitor Co is electrically connected to the battery input negative in-; and the control device 2 is specifically configured to control the switching timing of the first switching device Q1 and the second switching device Q2 to be complementary.

[0067] As shown in Fig. 17, the control device 2 is specifically configured to, when the voltage value Vin+ of the battery input positive electrode in+ is less than or equal to the first threshold value Vt1 and the voltage value Vin+ of the battery input positive electrode in+ is greater than or equal to the second threshold value Vt2, control the switching duty cycle D of the first switching device Q1 to be equal to a, 1>a>0. Vo / Vin+=D, Vo is the output voltage, that is, the bus positive voltage Vbus+. D=a, that is, the duty cycles of the first switching device Q1 and the second switching device Q2 remain unchanged, by setting a to be different values, that is, the ratio of Vbus+ to Vin+ can be changed, to realize open-loop control. In this process, the inductor L is equivalent to the role of a resistor, and the magnetic loss of the inductor is small, so the power conversion efficiency of the step-down voltage conversion circuit 1 is relatively high. The control device 2 is specifically configured to, when the voltage value Vin+ of the battery input positive electrode in+ is greater than the first threshold value Vt1, control the switching duty cycle D of the first switching device Q1 to be less than a, and control the switching duty cycle D to be negatively correlated with the voltage value Vin+ of the battery input positive electrode in+, that is, the voltage value Vbus+ of the bus positive electrode bus+ can be kept as the first voltage value V1, to realize closed-loop control. The control device 2 is specifically configured to, when the voltage value Vin+ of the battery input positive electrode in+ is less than the second threshold value Vt2, control the switching duty cycle D of the first switching device Q1 to be greater than a, and control the switching duty cycle D to be negatively correlated with the voltage value Vin+ of the battery input positive electrode in+, that is, the voltage value Vbus+ of the bus positive electrode bus+ can be kept as the second voltage value V2, to realize closed-loop control. That is, by controlling the switching duty cycle D of the first switching device Q1, the circuit shown in Fig. 16 can realize the control process shown in Fig. 4.

[0068] As shown in FIG. 18, the power supply further comprises a battery input negative pole in-, the step-down voltage conversion circuit 1 comprises: a first switching device Q1, a first end of the first switching device Q1 is electrically connected to a battery input positive pole in+; an inductor L, a first end of the inductor L is electrically connected to a second end of the first switching device Q1, and a second end of the inductor L is electrically connected to a bus positive pole bus+; a second switching device Q2, a first end of the second switching device Q2 is electrically connected to a center tap of the inductor L, and a second end of the second switching device Q2 is electrically connected to the battery input negative pole in-; an output capacitor Co, a first end of the output capacitor Co is electrically connected to the bus positive pole bus+, and a second end of the output capacitor Co is electrically connected to the battery input negative pole in-; and the control device 2 is specifically configured to control switching time sequences of the first switching device Q1 and the second switching device Q2 to be complementary. The control device 2 is specifically configured to: when a voltage value Vin+ of the battery input positive pole in+ is less than or equal to a first threshold value Vt1, and the voltage value Vin+ of the battery input positive pole in+ is greater than or equal to a second threshold value Vt2, control a switching duty cycle D of the first switching device Q1 to be equal to b, to realize open-loop control, 1 > b > 0; when the voltage value Vin+ of the battery input positive pole in+ is greater than the first threshold value Vt1, control the switching duty cycle D of the first switching device Q1 to be less than b, and control the switching duty cycle D to be negatively correlated with the voltage value Vin+ of the battery input positive pole in+, that is, the voltage value Vbus+ of the bus positive pole bus+ can be maintained as a first voltage value V1, to realize closed-loop control; and when the voltage value Vin+ of the battery input positive pole in+ is less than the second threshold value Vt2, control the switching duty cycle D of the first switching device Q1 to be greater than b, and control the switching duty cycle D to be negatively correlated with the voltage value Vin+ of the battery input positive pole in+, that is, the voltage value Vbus+ of the bus positive pole bus+ can be maintained as a second voltage value V2, to realize closed-loop control. Vo / Vin+ = D / (1+K-D×K), wherein Vo is an output voltage of the step-down voltage conversion circuit 1, that is, the bus positive pole voltage Vbus+, and K is a ratio of a number of turns between a center tap and a first end of the inductor L to a number of turns between the center tap and a second end of the inductor L.

[0069] In some embodiments, as shown in FIG. 19, the power supply can be used in a personal computer (PC), for example, the power supply further comprises a power supply interface 10, for example, a Type-C interface or the like for connecting an external power supply; a bidirectional voltage conversion circuit 20, the power supply interface 10 is electrically connected to the battery input positive terminal in+ through the bidirectional voltage conversion circuit 20, the bidirectional voltage conversion circuit 20 can realize boost conversion and buck conversion to charge the battery through the external power supply; a first load power supply end 31; a first voltage conversion circuit 41, the bus positive bus+ is electrically connected to the first load power supply end 31 through the first voltage conversion circuit 41; a second load power supply end 32; a second voltage conversion circuit 42, the bus positive bus+ is electrically connected to the second load power supply end 32 through the second voltage conversion circuit 42; the first load power supply end 31 and the second load power supply end 32 are any two of the following items: a processor power supply end, a screen power supply end, a memory power supply end, a Type-C interface power supply end and a power amplifier power supply end, the processor power supply end can supply power to the CPU in the PC, the screen power supply end can supply power to the screen in the PC, the memory power supply end can supply power to the DDR storage in the PC, the Type-C interface power supply end can supply power to the power supply pin in the Type-C interface in the PC, and the power amplifier power supply end can supply power to the power amplifier in the PC. The power supply of the embodiment of the present application makes the power supply voltage required by the rear device uniform through the narrow closed loop control mode, and improves the overall power supply efficiency.

[0070] In some embodiments, as shown in FIG. 20, in addition to supplying power to all loads through the buck-type voltage conversion circuit 1, part of the loads can also be supplied with power through the buck-type voltage conversion circuit 1, and the other part of the loads can be supplied with power through other ways, for example, directly through the battery.

[0071] The embodiment of the present application also provides an electronic device comprising the above-mentioned power supply.

[0072] FIG. 21 shows a structural schematic diagram of an electronic device 100 in the embodiment of the present application.

[0073] The electronic device 100 can comprise a processor 110, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, a display screen 194 (i.e. a screen) and the like.

[0074] It can be understood that the structural schematic of the embodiments of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 can include more or fewer components than the schematic, or combine certain components, or split certain components, or different arrangement of components. The components shown can be implemented in hardware, software or a combination of software and hardware.

[0075] The processor 110 can include one or more processing units, for example: the processor 110 can include a CPU. Different processing units can be independent devices, or can be integrated in one or more processors.

[0076] The controller can generate operation control signals according to instruction operation codes and timing signals to complete the control of fetching and executing instructions.

[0077] The processor 110 can also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory can save instructions or data that the processor 110 has just used or repeatedly uses. If the processor 110 needs to use the instructions or data again, it can be directly called from the memory. This avoids repeated access and reduces the waiting time of the processor 110, thus improving the efficiency of the system.

[0078] In some embodiments, the processor 110 can include one or more interfaces. The interface can include a universal serial bus (USB) interface and the like.

[0079] The USB interface 130 is an interface conforming to the USB standard specification, which can be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc. The USB interface 130 can be used to connect a charger to charge the electronic device 100, and can also be used to transmit data between the electronic device 100 and a peripheral device. It can also be used to connect earphones to play audio through the earphones. The interface can also be used to connect other electronic devices, such as AR devices, etc.

[0080] It can be understood that the interface connection relationship between the modules shown in the embodiments of the present application is only illustrative and does not constitute a structural limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 can also use different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0081] The charging management module 140 is configured to receive charging input from a charger. The charger can be a wireless charger or a wired charger. In some embodiments of wired charging, the charging management module 140 can receive charging input from a wired charger through the USB interface 130. In some embodiments of wireless charging, the charging management module 140 can receive wireless charging input through a wireless charging coil of the electronic device 100. The charging management module 140 can supply power to the electronic device while charging the battery 142.

[0082] The power management module 141 is configured to connect the battery 142, the charging management module 140, and the processor 110. The power management module 141 receives input from the battery 142 and / or the charging management module 140 to supply power to the processor 110, the internal memory 121, the display screen 194 (i.e., the screen), and the like. The power management module 141 can also be configured to monitor parameters such as battery capacity, battery cycle count, battery health status (leakage, impedance), and the like. In some other embodiments, the power management module 141 can also be disposed in the processor 110. In some other embodiments, the power management module 141 and the charging management module 140 can also be disposed in the same device. The power management module 141 can be or can include the power supply in the above-described embodiments.

[0083] The display screen 194 is configured to display images, videos, and the like. The display screen 194 includes a display panel. The display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light emitting diode (AMOLED), a flex light-emitting diode (FLED), a Miniled, a MicroLed, a Micro-oLed, a quantum dot light emitting diodes (QLED), and the like. In some embodiments, the electronic device 100 can include one or N display screens 194, where N is a positive integer greater than 1.

[0084] The internal memory 121 can be used to store computer executable program codes including instructions. The internal memory 121 can include a program storage area and a data storage area. The program storage area can store an operating system, at least one application required by a function (such as a sound playing function, an image playing function, etc.), and the like. The data storage area can store data (such as audio data, a phone book, etc.) created during use of the electronic device 100, and the like. In addition, the internal memory 121 can include a high-speed random access memory, and can further include a non-volatile memory such as at least one of a magnetic disk storage device, a flash memory device, a universal flash storage (UFS), and the like. The processor 110 performs various function applications and data processing of the electronic device 100 by running instructions stored in the internal memory 121 and / or instructions stored in a memory disposed in the processor.

[0085] The electronic device related in the present application can be a smart television, a tablet computer, a personal computer (PC), a vehicle-mounted device, a smart car, a smart sound, a robot, and the like. The power supply of the electronic device in the embodiments of the present application needs to increase a level of voltage conversion topology on the basis of the prior art. For small power and small devices such as smart watches and mobile phones, each increase of a level of topology will occupy a larger area, which is not consistent with the demand for miniaturization. Therefore, the electronic device in the embodiments of the present application is not suitable for small devices such as smart watches and mobile phones.

[0086] In the above embodiments, all or part can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes one or more available media sets. The available media can be magnetic media (for example, floppy disk, hard disk, magnetic tape), optical media (for example, DVD), or semiconductor media (for example, Solid State Disk) and the like.

[0087] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the cases of A alone, A and B together, and B alone. Wherein A, B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one of the following" and the like expressions mean any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple.

[0088] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A power supply, characterized by, The battery input positive electrode is electrically connected to the bus positive electrode through a step-down voltage conversion circuit. The control device is configured to control the step-down voltage conversion circuit to keep the ratio of the voltage value of the bus positive electrode to the voltage value of the battery input positive electrode unchanged when the voltage value of the battery input positive electrode is less than or equal to a first threshold value and the voltage value of the battery input positive electrode is greater than or equal to a second threshold value, the second threshold value being less than the first threshold value. The control device is further configured to control the step-down voltage conversion circuit to make the voltage value of the bus positive electrode be the first voltage value when the voltage value of the battery input positive electrode is greater than or equal to the first threshold value. The control device is further configured to control the step-down voltage conversion circuit to make the voltage value of the bus positive electrode be a second voltage value when the voltage value of the battery input positive electrode is less than or equal to the second threshold value.

2. The power supply according to claim 1, wherein the step-down voltage conversion circuit is an n-level step-down voltage conversion circuit, n≥3.

3. The power supply according to claim 2, wherein n=3, and the power supply further comprises a battery input negative electrode, and the step-down voltage conversion circuit comprises: a first switch device, a second switch device, a third switch device and a fourth switch device connected in series between the battery input positive electrode and the battery input negative electrode; a flying capacitor, a first end of the flying capacitor being electrically connected to a connection node between the first switch device and the second switch device, and a second end of the flying capacitor being electrically connected to a connection node between the third switch device and the fourth switch device; an inductor, a first end of the inductor being electrically connected to a connection node between the second switch device and the third switch device, and a second end of the inductor being electrically connected to the bus positive electrode; an output capacitor, a first end of the output capacitor being electrically connected to the bus positive electrode, and a second end of the output capacitor being electrically connected to the battery input negative electrode; The control device is specifically configured to control the switching timing of the first switch device and the fourth switch device to be complementary, control the switching timing of the second switch device and the third switch device to be complementary, and control the phase shift angle of the switching timing of the first switch device and the second switch device to be 180°. The control device is specifically configured to control the switching duty cycle of the first switch device and the second switch device to be equal to 0.5 when the voltage value of the battery input positive electrode is less than or equal to the first threshold value and the voltage value of the battery input positive electrode is greater than or equal to the second threshold value. The control device is specifically configured to control the switching duty cycle of the first switch device and the second switch device to be less than 0.5 when the voltage value of the battery input positive electrode is greater than the first threshold value, and control the switching duty cycle to be negatively correlated with the voltage value of the battery input positive electrode. ​ ​ ​ ​ The control device is specifically configured to control the switching duty cycle of the first switching device and the second switching device to be greater than 0.5 when the voltage value of the positive electrode of the battery input end is less than the second threshold value, and control the switching duty cycle to be negatively correlated with the voltage value of the positive electrode of the battery input end.

4. The power supply of claim 3, wherein The voltage value of the flying capacitor is equal to half of the voltage value of the positive electrode of the battery input end.

5. The power supply of claim 1, wherein The power supply further comprises a negative electrode of the battery input end, and the step-down voltage conversion circuit comprises: a first switching device, a second switching device, a third switching device and a fourth switching device connected in series between the positive electrode of the battery input end and the negative electrode of the battery input end, a connection node between the second switching device and the third switching device being electrically connected to the positive pole of the bus; a resonance capacitor, a first end of the resonance capacitor being electrically connected to a connection node between the first switching device and the second switching device; a resonance inductor, a first end of the resonance inductor being electrically connected to a second end of the resonance capacitor, and a second end of the resonance inductor being electrically connected to a connection node between the second switching device and the third switching device; an output capacitor, a first end of the output capacitor being electrically connected to the positive pole of the bus, and a second end of the output capacitor being electrically connected to the negative electrode of the battery input end; The control device is specifically configured to control the switching time sequence of the first switching device and the second switching device to be complementary, and the switching time sequence of the third switching device and the fourth switching device to be complementary. The control device is specifically configured to keep the ratio of the voltage value of the positive pole of the bus to the voltage value of the positive electrode of the battery input end unchanged by adjusting at least one of the switching frequency, the switching duty cycle and the phase shift angle when the voltage value of the positive electrode of the battery input end is less than or equal to the first threshold value and greater than or equal to the second threshold value. The switching frequency includes the switching frequency of the first switching device, the second switching device, the third switching device and the fourth switching device, the switching duty cycle is the switching duty cycle of the first switching device and the third switching device, and the phase shift angle is the phase shift angle of the switching time sequence of the first switching device and the third switching device. The control device is specifically configured to make the voltage value of the positive pole of the bus be the first voltage value by adjusting at least one of the switching frequency, the switching duty cycle and the phase shift angle when the voltage value of the positive electrode of the battery input end is greater than the first threshold value. The control device is further configured to make the voltage value of the positive pole of the bus be the second voltage value by adjusting at least one of the switching frequency, the switching duty cycle and the phase shift angle when the voltage value of the positive electrode of the battery input end is less than the second threshold value.

6. The power supply of claim 1, wherein The power supply further comprises a negative electrode of the battery input end, and the step-down voltage conversion circuit comprises: a first switch device and a second switch device connected in series between the positive pole of the battery input and the negative pole of the battery input in sequence; an inductor, a first end of the inductor being electrically connected to a connection node between the first switch device and the second switch device, a second end of the inductor being electrically connected to the positive pole of the busbar; an output capacitor, a first end of the output capacitor being electrically connected to the positive pole of the busbar, a second end of the output capacitor being electrically connected to the negative pole of the battery input; the control device is specifically configured to control the switching time sequence of the first switch device and the second switch device to be complementary; when the voltage value of the positive pole of the battery input is less than or equal to the first threshold value and the voltage value of the positive pole of the battery input is greater than or equal to the second threshold value, the control device is specifically configured to control the switching duty cycle of the first switch device to be equal to a, 1>a>0; when the voltage value of the positive pole of the battery input is greater than the first threshold value, the control device is specifically configured to control the switching duty cycle of the first switch device to be less than a, and the control device is specifically configured to control the switching duty cycle to be negatively related to the voltage value of the positive pole of the battery input; when the voltage value of the positive pole of the battery input is less than the second threshold value, the control device is specifically configured to control the switching duty cycle of the first switch device to be greater than a, and the control device is specifically configured to control the switching duty cycle to be negatively related to the voltage value of the positive pole of the battery input.

7. The power supply of claim 1, wherein the power supply further comprises a negative pole of the battery input, and the step-down voltage conversion circuit comprises: a first switch device, a first end of the first switch device being electrically connected to the positive pole of the battery input; an inductor, a first end of the inductor being electrically connected to a second end of the first switch device, a second end of the inductor being electrically connected to the positive pole of the busbar; a second switch device, a first end of the second switch device being electrically connected to a center tap of the inductor, a second end of the second switch device being electrically connected to the negative pole of the battery input; an output capacitor, a first end of the output capacitor being electrically connected to the positive pole of the busbar, a second end of the output capacitor being electrically connected to the negative pole of the battery input; the control device is specifically configured to control the switching time sequence of the first switch device and the second switch device to be complementary; when the voltage value of the positive pole of the battery input is less than or equal to the first threshold value and the voltage value of the positive pole of the battery input is greater than or equal to the second threshold value, the control device is specifically configured to control the switching duty cycle of the first switch device to be equal to b, 1>b>0; when the voltage value of the positive pole of the battery input is greater than the first threshold value, the control device is specifically configured to control the switching duty cycle of the first switch device to be less than b, and the control device is specifically configured to control the switching duty cycle to be negatively related to the voltage value of the positive pole of the battery input; when the voltage value of the positive pole of the battery input is less than the second threshold value, the control device is specifically configured to control the switching duty cycle of the first switch device to be greater than b, and the control device is specifically configured to control the switching duty cycle to be negatively related to the voltage value of the positive pole of the battery input.

8. The power supply of claim 1, wherein, further comprising: a power supply interface; A bidirectional voltage conversion circuit, the power supply interface is electrically connected to the battery input positive pole through the bidirectional voltage conversion circuit; A first load power supply end; A first voltage conversion circuit, the bus positive pole is electrically connected to the first load power supply end through the first voltage conversion circuit; A second load power supply end; A second voltage conversion circuit, the bus positive pole is electrically connected to the second load power supply end through the second voltage conversion circuit; The first load power supply end and the second load power supply end are any two of the following items: a processor power supply end, a screen power supply end, a memory power supply end, a TypeC interface power supply end, and a power amplifier power supply end.

9. The power supply source according to any one of claims 1 to 8, wherein The first threshold value is 12V, and the second threshold value is 10V.

10. An electronic device, comprising: A power supply source as claimed in any one of claims 1 to 9.

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