Voltage conversion module, power supply circuit, chip, electronic equipment and voltage conversion method

Abstract

The embodiment of the invention discloses a voltage conversion module, a power supply circuit, a chip, electronic equipment and a voltage conversion method. The voltage conversion module is applied to the power supply circuit, the power supply circuit further comprises a battery, a charging management module and a load, and the charging management module is used for being connected with a power supply device; the voltage conversion module is respectively connected with the battery and the charging management module; the voltage conversion module comprises a bypass circuit and a voltage conversion circuit which are connected in parallel; and the voltage conversion module is used for boosting a first voltage provided by the battery through a voltage conversion circuit under the condition that the battery voltage of the battery is smaller than or equal to a first voltage threshold value, and transmitting a second voltage obtained through boosting to the charging management module so as to supply power to a load. In the embodiment of the invention, the use limitation of the battery under the condition of low electric quantity can be reduced, the capacity of the battery is released more, and the cruising ability of the electronic equipment provided with the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuits, in particular to a voltage conversion module, a power supply circuit, a chip, an electronic device and a voltage conversion method. BACKGROUND

[0002] At present, the minimum discharge voltage of the graphite negative electrode battery widely used in electronic devices is usually above 3.2V (volt), and the power supply voltage of most loads of electronic devices is designed according to the graphite negative electrode battery. Compared with the traditional graphite negative electrode battery, the silicon negative electrode battery has higher energy density and is an important development direction of batteries. The minimum discharge voltage of the silicon negative electrode battery will be further lowered to 2.7V or even 2.5V, which may cause the voltage provided by the silicon negative electrode battery to be lower than the under voltage lockout (UVLO) voltage of the load, resulting in the load unable to work normally. Therefore, due to the limitation of the UVLO voltage of the load, the silicon negative electrode battery needs to limit the use of power when the battery is low, and the capacity of the silicon negative electrode battery cannot be fully released. SUMMARY

[0003] The embodiments of the present application disclose a voltage conversion module, a power supply circuit, a chip, an electronic device and a voltage conversion method, which can reduce the use limitation of the battery when the battery is low, release more capacity of the battery, and improve the endurance of the electronic device provided with the battery.

[0004] The embodiments of the present application disclose a voltage conversion module, which is applied to a power supply circuit, the power supply circuit further comprising a battery, a charge management module and a load, the charge management module being connected with the load, and the charge management module being used for connecting a power supply device; a first end of the voltage conversion module being connected with the battery, and a second end of the voltage conversion module being connected with the charge management module.

[0005] The voltage conversion module comprises:

[0006] a bypass circuit;

[0007] a voltage conversion circuit connected in parallel with the bypass circuit;

[0008] The voltage conversion module is used for, in a case where the battery voltage of the battery is greater than a first voltage threshold, transmitting a first voltage provided by the battery to the charge management module through the bypass circuit to supply power to the load; and in a case where the battery voltage of the battery is less than or equal to the first voltage threshold, performing voltage boosting processing on the first voltage provided by the battery through the voltage conversion circuit to obtain a second voltage, and transmitting the second voltage to the charge management module to supply power to the load.

[0009] The embodiment of the present application discloses a power supply circuit, comprising:

[0010] a load;

[0011] a battery, configured to provide a first voltage for the voltage conversion module;

[0012] a charge management module, connected with the load, and configured to be connected with a power supply device;

[0013] the voltage conversion module as described above.

[0014] The embodiment of the present application discloses a chip, comprising the voltage conversion module as described above, or comprising the power supply circuit as described above.

[0015] The embodiment of the present application discloses an electronic device, comprising the voltage conversion module as described above, or comprising the power supply circuit as described above, or comprising the chip as described above.

[0016] The embodiment of the present application discloses a voltage conversion method, comprising:

[0017] when the battery voltage of the battery is greater than a first voltage threshold, transmitting the first voltage provided by the battery to the charge management module through a bypass circuit of the voltage conversion module, so as to supply power to the load;

[0018] when the battery voltage of the battery is less than or equal to the first voltage threshold, performing a voltage boosting process on the first voltage provided by the battery through a voltage conversion circuit of the voltage conversion module, obtaining a second voltage, and transmitting the second voltage to the charge management module, so as to supply power to the load.

[0019] The voltage conversion module disclosed by the embodiment of the present application is applied to the power supply circuit, the power supply circuit further comprises a battery, a charging management module and a load, the charging management module is connected with the load, and the charging management module is used for connecting a power supply device; the first end of the voltage conversion module is connected with the battery, and the second end of the voltage conversion module is connected with the charging management module; the voltage conversion module comprises a bypass circuit and a voltage conversion circuit, in the case that the battery voltage of the battery is greater than a first voltage threshold, the first voltage provided by the battery is transmitted to the charging management module through the bypass circuit to supply power to the load, in the case that the battery voltage of the battery is less than or equal to the first voltage threshold, the first voltage provided by the battery is boosted by the voltage conversion circuit to obtain a second voltage, and the second voltage is transmitted to the charging management module to supply power to the load. By setting the voltage conversion module between the battery and the charging management module, and boosting the first voltage output by the battery through the voltage conversion circuit of the voltage conversion module when the battery voltage of the battery is less than or equal to the first voltage threshold, only the second voltage obtained by boosting needs to be greater than the UVLO voltage of the charging management module and the load, so that the charging management module and the load can work normally, and therefore the battery voltage can be made lower, the use limit of the battery under low power can be reduced, the capacity of the battery can be released more, and the endurance of the electronic device provided with the battery can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in 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 only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1A A circuit schematic diagram of a power supply circuit in the related art;

[0022] Figure 1B A circuit schematic diagram of a boost-bypass module in the related art;

[0023] Figure 2 A structural block diagram of a voltage conversion module and a power supply circuit in an embodiment;

[0024] Figure 3 A structural block diagram of a voltage conversion module and a power supply circuit in another embodiment;

[0025] Figure 4 A circuit schematic diagram of a power supply circuit in an embodiment;

[0026] Figure 5Structure block diagram of voltage conversion module and power supply circuit in another embodiment;

[0027] Figure 6 Structure block diagram of voltage conversion module and power supply circuit in another embodiment;

[0028] Figure 7 Schematic diagram of implementing closed-loop control on voltage conversion circuit in an embodiment;

[0029] Figure 8A Circuit schematic diagram of voltage conversion circuit 214 in an embodiment;

[0030] Figure 8B Circuit schematic diagram of voltage conversion circuit 214 in another embodiment;

[0031] Figure 9A Circuit schematic diagram of voltage conversion circuit 214 in another embodiment;

[0032] Figure 9B Circuit schematic diagram of voltage conversion circuit 214 in another embodiment;

[0033] Figure 10 Circuit schematic diagram of power supply circuit in another embodiment;

[0034] Figure 11 Flow chart of voltage conversion method in an embodiment. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] It should be noted that the terms “include” and “have” and any variations thereof in the embodiments of the present application and the drawings are intended to cover the inclusions without the exclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally further include steps or units not listed or can optionally further include other steps or units inherent to the process, method, product or device.

[0037] It can be understood that the terms "first", "second" and the like used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the other element. For example, without departing from the scope of the present application, the first switch can be referred to as the second switch, and similarly, the second switch can be referred to as the first switch. The first switch and the second switch are both switches, but they are not the same switch. The term "a plurality of" used in the present application refers to two or more. The term "and / or" used in the present application refers to one of the options or any combination of a plurality of options. The term "connected" used in the present application should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be internal connection of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] The minimum discharge voltage of the currently widely used graphite negative electrode battery is generally 3.2V or more, and most of the loads of electronic devices are designed based on the graphite negative electrode battery, so the power supply voltage required by most of the loads of electronic devices is 3.2V or more. The energy density of the silicon negative electrode battery is higher than that of the graphite negative electrode battery, but the minimum discharge voltage is lower, which is 2.7V or even 2.5V, which will cause some loads to be unable to work normally at such a low voltage. In order to solve this problem, in the related art, a boost circuit is usually arranged in the power supply circuit of the silicon negative electrode battery, and the discharge voltage of the silicon negative electrode battery is boosted by the boost circuit to ensure the normal work of the load.

[0039] Figure 1A The circuit schematic diagram of the power supply circuit in the related art is shown in FIG. 1. As shown in FIG. 1, the power supply circuit in the related art includes a boost circuit 100, a silicon negative electrode battery 200, a load 300 and a control circuit 400. Figure 1AAs shown, the discharge voltage Vbat of the battery output supplies power to the load in the system through the BAT FET of the charger IC, that is, Vsys=Vbat. Since the UVLO voltage of the power management IC (PMIC) is 2V-2.5V, the UVLO voltage of part of the high UVLO load (such as image devices, radio frequency devices, etc.) is greater than the UVLO voltage of the PMIC, and therefore, the part of the load needs to be supplied with power through the boost-bypass module 100. For example, when the discharge voltage Vbat of the battery output is greater than the UVLO voltage of the high UVLO load, the boost-bypass module 100 turns on the bypass switch to directly provide the voltage Vsys to the high UVLO load for power supply; when the discharge voltage Vbat of the battery output is less than the UVLO voltage of the high UVLO load, the boost-bypass module 100 works in the boost state, the boost-bypass module 100 turns off the bypass switch, and the voltage Vsys is boosted through the one-way boost circuit, and then the boosted voltage is provided to the high UVLO load for power supply.

[0040] Figure 1B The circuit schematic diagram of the boost-bypass module in the related art is shown in FIG. 1. Figure 1B As shown, the boost-bypass module 100 includes a bypass switch Q1 and a boost circuit 110, and the boost circuit 110 includes an inductor L1, a switch Q2, and a switch Q3. When the discharge voltage Vbat of the battery output is greater than the UVLO voltage of the high UVLO load, the bypass switch Q1 is turned on, and the voltage Vsys is supplied to the load through the turned-on bypass switch Q1; when the discharge voltage Vbat of the battery output is less than the UVLO voltage of the high UVLO load, the bypass switch Q1 is turned off, and the switch Q2 and the switch Q3 are switched between being turned on and being turned off, and the voltage Vsys is boosted through the charging and discharging of the inductor L1.

[0041] Since the silicon negative electrode battery has a large internal resistance at low power, and the processor, image device, etc. in the electronic device has a large transient current in part of the use scenarios (such as a photographing scenario, a game scenario, etc.), the increase of the transient current will cause the voltage drop inside the battery to increase, thereby causing the discharge voltage Vbat of the battery output to have a transient drop, that is, the voltage Vsys has a transient drop, which has a risk of being lower than 2V, resulting in the PMIC being unable to work. Limited by the limitation that the UVLO voltage of the PMIC is 2V-2.5V, the silicon negative electrode battery needs to limit the use power at low power, and the capacity of the silicon negative electrode battery cannot be fully released.

[0042] The voltage conversion module, the power supply circuit, the chip, the electronic device and the voltage conversion method disclosed by the embodiments of the present application can reduce the use limitation of the battery under low power, release the capacity of the battery more, and improve the endurance of the electronic device provided with the battery.

[0043] As shown in Figure 2 In one embodiment, a voltage conversion module 210 is provided, which can be applied to a power supply circuit 200, the power supply circuit 200 further comprising a battery 220, a charging management module 230 and a load 240, the charging management module 230 being connected with the load 240. The voltage conversion module 210 can be arranged between the battery 220 and the charging management module 230, a first end of the voltage conversion module 210 can be connected with the battery 220, and a second end of the voltage conversion module 210 can be connected with the charging management module 230.

[0044] In the case that the battery 220 is in a discharging state, the battery 220 can output a first voltage to the voltage conversion module 210, the first voltage referring to the discharging voltage of the battery 220.

[0045] In some embodiments, the battery 220 can be a battery with a small minimum discharging voltage, such as a silicon negative electrode battery, the minimum discharging voltage referring to the minimum value of the first voltage output by the battery 220, for example, the minimum discharging voltage of the battery 220 can be less than 2.5V, or even less than 2V. Alternatively, the battery 220 can be a single-cell battery, and the first voltage provided by the battery 220 can be equal to the battery voltage of the battery 220.

[0046] The charging management module 230 can be used to be connected with a power supply device 300, in the case that the charging management module 230 is connected with the power supply device 300, the charging management module 230 can charge the battery 220 according to the voltage and / or current provided by the power supply device 300. The charging management module 230 can control and manage the charging process of the battery 220, for example, can control the charging current and / or charging voltage of the battery 220 in the charging process.

[0047] Alternatively, the power supply device 300 can include but is not limited to an adapter, a mobile power supply and the like. The charging management module 230 can be connected with the power supply device 300 in a wired or wireless manner. For example, the charging management module 230 can comprise a charging interface, which can be a USB (Universal Serial Bus) interface (such as a Type-C interface and the like), and the charging interface can be connected with the power supply device 300 through a charging cable. It should be noted that the specific connection manner between the charging management module 230 and the power supply device 300 is not limited in the embodiments of the present application.

[0048] In some embodiments, the charge management module 230 can further include a BAT FET, which can be used to turn on or turn off a connection path between the battery 220 and the load 240. In a case where the load 240 needs to be powered by the battery 220, the BAT FET can turn on the connection path between the battery 220 and the load 240, and a first voltage output by the battery 220 can be transmitted to the load 240 via the voltage conversion module 210 and the BAT FET of the charge management module 230 to power the load 240. Alternatively, in a case where the load 240 does not need to be powered by the battery 220, the BAT FET can turn off the connection path between the battery 220 and the load 240.

[0049] The voltage conversion module 210 can include a bypass circuit 212 and a voltage conversion circuit 214, the bypass circuit 212 can be connected with the battery 220 and the charge management module 230 respectively, and the voltage conversion circuit 214 can be connected with the battery 220 and the charge management module 230 respectively, and the bypass circuit 212 and the voltage conversion circuit 214 can be connected in parallel.

[0050] The voltage conversion module 210 is configured to transmit the first voltage provided by the battery 220 to the charge management module 230 via the bypass circuit 212 to power the load 240 in a case where the battery voltage of the battery 220 is greater than the first voltage threshold, and the voltage conversion module 210 is configured to perform voltage boosting processing on the first voltage provided by the battery 220 to obtain a second voltage via the voltage conversion circuit 214 in a case where the battery voltage of the battery 220 is less than or equal to the first voltage threshold, and the voltage conversion module 210 is configured to transmit the second voltage to the charge management module 230 to power the load 240.

[0051] The voltage conversion module 210 can select to transmit the voltage to the charge management module 230 via the bypass circuit 212 or the voltage conversion circuit 214 according to the battery voltage of the battery 220. The bypass circuit 212 can be a low-delay and / or low-impedance circuit, and in some embodiments, the voltage conversion module 210 can selectively turn on the bypass circuit 212 according to the battery voltage of the battery 220, the voltage conversion circuit 214 does not work in a case where the bypass circuit 212 is turned on, and the voltage conversion circuit 214 works in a case where the bypass circuit 212 is not turned on.

[0052] In a case where the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, and the first voltage provided by the battery 220 is transmitted to the charge management module 230 via the bypass circuit 212, because the impedance of the bypass circuit 212 is very low and can be ignored, therefore, the voltage transmitted to the charge management module 230 by the bypass circuit 212 can be equal to the first voltage output by the battery 220.

[0053] Optionally, the first voltage threshold can be set according to actual requirements, and the first voltage threshold can be greater than the UVLO voltage of the charging management module 230 and at least part of the load 240. The load 240 can include a first load, a second load, and a PMIC, the first load being a high-UVLO load, the second load being a low-UVLO load, the UVLO voltage of the first load being greater than the UVLO voltage of the second load, and further, the first load can be a load with a UVLO voltage greater than the UVLO threshold, for example, the first load can include but is not limited to one or more of a camera module, a display screen, and a radio frequency module. The first voltage threshold can be greater than the UVLO voltage of all loads in the electronic device, or the first voltage threshold can be at least greater than the UVLO voltage of the second load and the PMIC.

[0054] When the battery voltage of the battery 220 is greater than the first voltage threshold, it indicates that the discharge voltage of the battery 220 is large and can support the normal work of the charging management module 230 and the load 240, and therefore, the first voltage output by the battery 220 can be directly provided to the charging management module 230 through the bypass circuit 212 to supply power to the load 240, which can improve the efficiency of the voltage conversion module 210 and reduce unnecessary power loss.

[0055] When the battery voltage of the battery 220 is less than or equal to the first voltage threshold, it indicates that the discharge voltage of the battery 220 is small and cannot support the normal work of the charging management module 230 and / or the load 240, and therefore, the first voltage provided by the battery 220 can be boosted by the voltage conversion circuit 214 to obtain a second voltage greater than the first voltage threshold and transmit the second voltage to the charging management module 230 to supply power to the load 240.

[0056] In some embodiments, the voltage conversion circuit 214 can include a DC-DC (Direct Current-Direct Current conversion) circuit, and the voltage conversion circuit 214 can include a switching device and an energy storage device assembly, the switching device can include but is not limited to an IGBT (Insulated Gate Bipolar Transistor), a MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor), etc., and the energy storage device can include an inductor and / or a capacitor, etc.

[0057] The voltage conversion circuit 214 has a voltage boosting function, and can boost the first voltage output by the battery 220, convert the first voltage less than or equal to the first voltage threshold into a second voltage greater than the first voltage threshold, to ensure normal operation of the charge management module 230 and the load 240. Optionally, the voltage boosting ratio of the voltage conversion circuit 214 can be fixed, for example, 1:2, 1:3, 2:3, etc. (referring to the ratio between the input voltage and the output voltage of the voltage conversion circuit 214); optionally, the voltage boosting ratio of the voltage conversion circuit 214 can be dynamically changed, and can be dynamically adjusted according to the voltage required by the charge management module 230 and the load 240 and the first voltage output by the battery 220.

[0058] Compared with the power supply circuit as shown in Figure 1A In the embodiment of the present application, the voltage conversion module 210 is arranged between the battery 220 and the charge management module 230, and the charge management module 230 and the load 240 are not directly powered by the battery 220, but the battery 220 supplies power to the charge management module 230 and the load 240 through the voltage conversion module 210. When the battery 220 is low (for example, the battery voltage of the battery 220 is less than or equal to the first voltage threshold), the voltage conversion circuit 214 in the voltage conversion module 210 boosts the first voltage, and only needs to ensure that the second voltage obtained by boosting is greater than the UVLO voltage of the charge management module 230 and the load 240, so that the charge management module 230 and the load 240 can work normally. For example, Figure 1A The power supply circuit as shown in is limited by the UVLO voltage of the PMIC, and the voltage output by the battery 220 usually needs to be greater than 2.5V to avoid the voltage output by the battery 220 being lower than 2V due to transient drop, so that the PMIC cannot work; and the voltage output by the battery 220 is also limited by the UVLO voltage of the charge management chip. In the embodiment of the present application, only the second voltage output by the voltage conversion circuit 214 needs to be greater than the UVLO voltage of the charge management module 230 and the load 240, so the first voltage output by the battery 220 can be lower, and the discharge can be more sufficient.

[0059] In the embodiments of the present application, by arranging the voltage conversion module 210 between the battery 220 and the charging management module 230, and by boosting the first voltage output by the battery 220 through the voltage conversion circuit 214 of the voltage conversion module 210 when the battery voltage of the battery 220 is less than or equal to the first voltage threshold, it is only required to ensure that the second voltage obtained by the boosting is greater than the UVLO voltage of the charging management module 230 and the load 240, so that the charging management module 230 and the load 240 can normally work, and thus the battery 220 can be discharged to a lower voltage, the use of the battery 220 at a low power can be reduced, the capacity of the battery 220 can be released more, and the endurance of the electronic device provided with the battery can be improved.

[0060] In some embodiments, the voltage conversion module 210 can support bidirectional power transmission, which can mean that the power transmission direction of the voltage conversion module 210 can be switched, the input end and the output end of the voltage conversion module 210 are not fixed, and the input end and the output end of the voltage conversion module 210 can be switched with each other. For example, in some cases, the first end of the voltage conversion module 210 is the input end, and the second end of the voltage conversion module 210 is the output end; in some cases, the first end of the voltage conversion module 210 is the output end, and the second end of the voltage conversion module 210 is the input end.

[0061] As an implementation, in the case where the charging management module 230 is not connected to the power supply device 300, the power transmission direction of the voltage conversion module 210 is the first direction; in the case where the charging management module 230 is connected to the power supply device 300, the power transmission direction of the voltage conversion module 210 is the first direction or the second direction.

[0062] The first direction is from the first end of the voltage conversion module 210 to the second end of the voltage conversion module 210, that is, the power is transmitted from the battery 220 to the charging management module 230 and the load 240 through the voltage conversion module 210. The second direction is from the second end of the voltage conversion module 210 to the first end of the voltage conversion module 210, that is, the power is transmitted from the charging management module 230 to the battery 220 through the voltage conversion module 210.

[0063] In the case where the charging management module 230 is not connected to the power supply device 300, the charging management module 230 and the load 240 are powered by the battery 220, the battery 220 is in a discharging state, and the first voltage output by the battery 220 is output to the charging management module 230 and the load 240 through the voltage conversion module 210. Therefore, in the case where the charging management module 230 is not connected to the power supply device 300, the voltage conversion module 210 only needs to support unidirectional power transmission.

[0064] Further, the voltage conversion module 210 is further configured to, in a case that the charging management module 230 is not connected to the power supply device 300, if the battery voltage of the battery 220 is greater than the first voltage threshold, transmit the first voltage provided by the battery 220 to the charging management module 230 through the bypass circuit 212 to supply power to the charging management module 230 and the load 240.

[0065] The voltage conversion module 210 is further configured to, in a case that the charging management module 230 is not connected to the power supply device 300, if the battery voltage of the battery 220 is less than or equal to the first voltage threshold, perform voltage boosting on the first voltage provided by the battery 220 through the voltage conversion circuit 214 to obtain a second voltage, and transmit the second voltage to the charging management module 230 to supply power to the charging management module 230 and the load 240.

[0066] In a case that the charging management module 230 is not connected to the power supply device 300, the charging management module 230 and the load 240 are only powered by the battery 220, and thus the voltage conversion module 210 only needs to support unidirectional power transmission, and the voltage conversion circuit 214 of the voltage conversion module 210 can be in a first working mode, in which the voltage conversion circuit 214 only supports unidirectional power transmission. When the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, the voltage conversion circuit 214 does not work, and the first voltage output by the battery 220 is directly transmitted to the charging management module 230 and the load 240 through the bypass circuit 212 to supply power to the charging management module 230 and the load 240. When the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass circuit 212 is turned off, the voltage conversion circuit 214 works, the first voltage output by the battery 220 is boosted through the voltage conversion circuit 214, and the charging management module 230 and the load 240 are supplied with power based on the second voltage obtained by the boosting, thereby ensuring the normal work of the charging management module 230 and the load 240, and allowing the battery 220 to be more fully discharged and improving the endurance of the electronic device provided with the battery.

[0067] Since the voltage conversion circuit 214 only needs to support unidirectional power transmission in the first working mode, the working frequency of the voltage conversion circuit 214 can be relatively small, that is, the switching devices in the voltage conversion circuit 214 can be switched between conduction and non-conduction at a relatively small frequency, for example, the working frequency of the voltage conversion circuit 214 can be 20 KHz (kilohertz), 50 KHz, 100 KHz, etc. in the first working mode, but is not limited thereto, thereby reducing the loss of the voltage conversion circuit 214 and improving the conversion efficiency of the voltage conversion circuit 214.

[0068] In the case that the charging management module 230 accesses the power supply device 300, the load 240 can be powered by the power supply device 300 alone or can be powered by the power supply device 300 and the battery 220 together. Whether the load 240 is powered by the power supply device 300 alone or by the power supply device 300 and the battery 220 together mainly depends on the required power supply current of the load 240. For example, when the required power supply current of the load 240 is large, the current provided by the power supply device 300 cannot meet the power supply requirement of the load 240, and thus the load 240 can be powered by the power supply device 300 and the battery 220 together. When the required power supply current of the load 240 is small, the current provided by the power supply device 300 can meet the power supply requirement of the load 240, and thus the load 240 can be powered by the power supply device 300 alone. Further, in the case that the charging management module 230 accesses the power supply device 300, if the battery 220 does not need to supply power to the load 240, the battery 220 can also be charged based on the voltage and / or current input by the power supply device 300.

[0069] In the case that the charging management module 230 accesses the power supply device 300, the battery 220 can be in a discharging state or in a charging state, and thus the voltage conversion module 210 needs to support bidirectional power transmission.

[0070] The voltage conversion module 210 is further configured to, in the case that the charging management module 230 accesses the power supply device 300, if the battery voltage of the battery 220 is greater than the first voltage threshold, transmit the first voltage provided by the battery 220 to the charging management module 230 through the bypass circuit 212 to supply power to the load 240 together with the charging management module 230, or transmit the third voltage output by the charging management module 230 to the battery 220 through the bypass circuit 212 to charge the battery 220.

[0071] The voltage conversion module 210 is further configured to, in the case that the charging management module 230 accesses the power supply device 300, if the battery voltage of the battery 220 is less than or equal to the first voltage threshold, perform voltage boosting on the first voltage provided by the battery 220 through the voltage conversion circuit 214 to obtain a second voltage, and transmit the second voltage to the charging management module 230 to supply power to the load 240 together with the charging management module 230, or perform voltage step-down on the third voltage output by the charging management module 230 through the voltage conversion circuit 214 to obtain a fourth voltage, and transmit the fourth voltage to the battery 220 to charge the battery 220.

[0072] The third voltage output by the charging management module 230 can be obtained by the charging management module 230 based on the voltage provided by the power supply device 300.

[0073] In the case that the charging management module 230 accesses the power supply device 300, the load 240 is powered by the power supply device 300, or by the power supply device 300 and the battery 220, the voltage conversion module 210 can support bidirectional energy transmission, and the energy transmission direction of the voltage conversion module 210 can be switched. Further, the voltage conversion circuit 214 of the voltage conversion module 210 can work in a second working mode, in which the voltage conversion circuit 214 supports bidirectional energy transmission, and in one direction is a boost, and in the other direction is a buck.

[0074] In some embodiments, the energy transmission direction of the voltage conversion module 210 can be automatically switched without the need for additional controller control, i.e. without the need to add additional switching devices or switching devices in the voltage conversion module 210 to achieve the switching of the energy transmission direction, the energy transmission direction of the voltage conversion module 210 is a natural switching process.

[0075] In the case that the charging management module 230 accesses the power supply device 300, the charging management module 230 can power the load 240 based on the voltage and / or current provided by the power supply device 300. In the case that the required power supply current of the load 240 is greater than the output current of the charging management module 230, it can be considered that the current provided by the power supply device 300 cannot meet the power supply demand of the load 240, then the load 240 will draw current from the second end of the voltage conversion module 210, the energy transmission direction of the voltage conversion module 210 is switched to the first direction, and the battery 220 is in a discharging state. When the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, the voltage conversion circuit 214 does not work, and the first voltage output by the battery 220 is directly transmitted to the charging management module 230 and the load 240 through the bypass circuit 212, the first voltage and the third voltage output by the charging management module 230 together power the load 240, i.e. the battery 220 and the power supply device 300 together power the load 240. When the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass circuit 212 is turned off, the voltage conversion circuit 214 works, the first voltage output by the battery 220 is boosted through the voltage conversion circuit 214, and the second voltage obtained by the boost and the third voltage output by the charging management module 230 together power the load 240, i.e. the battery 220 and the power supply device 300 together power the load 240.

[0076] Optionally, in the case that the battery 220 and the power supply device 300 together power the load 240, the voltage (first voltage or second voltage) output by the voltage conversion module 210 can be the same as the third voltage output by the charging management module 230, thereby improving the stability of the power supply circuit 200.

[0077] Optionally, in the case that the battery 220 and the power supply device 300 jointly supply power to the load 240, the current output by the battery 220 via the voltage conversion module 210 and the current output by the power supply device 300 via the charge management module 230 can be different, and the current output by the power supply device 300 via the charge management module 230 can be greater than the current output by the battery 220 via the voltage conversion module 210. Since the battery 220 is likely to be in a low power state when the charge management module 230 is connected to the power supply device 300, the power supply current required by the load 240 can be mainly provided by the power supply device 300 to avoid excessive discharge of the battery 220, damage to the battery 220, and affect the service life of the battery 220.

[0078] In the case that the power supply current required by the load 240 is less than the current output by the charge management module 230, it can be considered that the current provided by the power supply device 300 can meet the power supply demand of the load 240, and then the load 240 is directly powered by the power supply device 300. Further, while the third voltage output by the charge management module 230 is used to power the load 240, the voltage conversion module 210 is used to charge the battery 220. The energy transmission direction of the voltage conversion module 210 is switched from the first direction to the second direction, and the battery 220 is in a charging state.

[0079] In the case that the battery 220 is in a charging state, if the battery voltage of the battery 220 is greater than the first voltage threshold and the voltage difference between the third voltage output by the charge management module 230 and the battery voltage of the battery 220 is small, the bypass circuit 212 can be turned on, the voltage conversion circuit 214 does not work, and the third voltage output by the charge management module 230 is directly transmitted to the battery 220 through the bypass circuit 212 to charge the battery 220. The charging voltage of the battery 220 can be equal to the third voltage output by the charge management module 230.

[0080] The voltage conversion circuit 214 has a step-down function, and the energy transmission direction corresponding to the step-down function is opposite to the energy transmission direction corresponding to the step-up function. In the case that the battery 220 is in a charging state, if the battery voltage of the battery 220 is not greater than the first voltage threshold and the voltage difference between the third voltage output by the charge management module 230 and the battery voltage of the battery 220 is large, the bypass circuit 212 can be disconnected, the voltage conversion circuit 214 works, the third voltage output by the charge management module 230 is processed by the voltage conversion circuit 214 to obtain a fourth voltage, and the battery 220 is charged based on the fourth voltage. The charging voltage of the battery 220 is less than the third voltage output by the charge management module 230.

[0081] Optionally, the step-down ratio of the voltage conversion circuit 214 can be fixed, for example, 2:1, 3:1, 3:2, etc. (referring to the ratio between the input voltage and the output voltage of the voltage conversion circuit 214); optionally, the step-down ratio of the voltage conversion circuit 214 can be dynamically changed, and can be dynamically adjusted according to the third voltage output by the charge management module 230 and the charging voltage required by the battery 220.

[0082] In the case that the battery 220 is in the charging state, if the battery voltage of the battery 220 is not greater than the first voltage threshold, the third voltage output by the charge management module 230 is step-down processed by the voltage conversion circuit 214, and when the battery 220 with low power is charged, the supply voltage of the load 240 can still maintain a relatively large voltage, that is, the battery 220 with low power can be charged, and the supply voltage of the load 240 will not be affected, thereby preventing the load 240 from being powered off.

[0083] Since the voltage conversion circuit 214 needs to support bidirectional power transmission in the second working mode, the working frequency of the voltage conversion circuit 214 can be relatively large, that is, the switching device in the voltage conversion circuit 214 can switch between conduction and disconnection according to a relatively large frequency. Further, the working frequency of the voltage conversion circuit 214 in the first working mode is less than the working frequency in the second working mode. For example, the working frequency of the voltage conversion circuit 214 in the second working mode can be 500 KHz, 800 KHz, 1 MHz (megahertz), etc., but is not limited thereto. The voltage conversion circuit 214 working in the second working mode with a relatively high working frequency can timely adjust the power transmission direction according to the demand of the load 240, and improve the timeliness and flexibility of the battery 220 switching between the charging state and the discharging state.

[0084] In the embodiments of the present application, the voltage conversion module 210 can support bidirectional power transmission, and can flexibly switch the power transmission direction in the case that the charge management module 230 accesses the power supply device 300, so as to meet the power supply demand of the load 240 and charge the battery 220, thereby improving the use flexibility of the voltage conversion module 210.

[0085] As shown in FIG. 2, in one embodiment, the voltage conversion module 210 can include a voltage conversion circuit 214 and a charge management module 230. Figure 3 The charge management module 230 can include a charging interface 232, and the charging interface 232 can be used to connect the power supply device 300. The voltage conversion module 210 can further include a detection port 216, and the detection port 216 can be connected with the charging interface 232.

[0086] The detection port 216 is used to detect whether the charging interface 232 accesses the power supply device 300.

[0087] In the case that the charging interface 232 is not connected to the power supply device 300, the charging interface 232 has no voltage and / or current input, and the detection port 216 does not receive the voltage from the charging interface 232, so it can be determined that the charging interface 232 is not connected to the power supply device 300. In the case that the charging interface 232 is connected to the power supply device 300, the charging interface 232 receives the voltage and / or current provided by the power supply device 300, and the detection port 216 receives the voltage from the charging interface 232, so it can be determined that the charging interface 232 is connected to the power supply device 300.

[0088] Further, in the case that the detection port 216 does not receive the voltage from the charging interface 232, the detection port 216 can output a first level signal, and in the case that the detection port 216 receives the voltage from the charging interface 232, the detection port 216 can output a second level signal. For example, the first level signal can be a low level signal, and the second level signal can be a high level signal; or the first level signal can be a high level signal, and the second level signal can be a low level signal. In the case that the voltage conversion module 210 obtains the first level signal output by the detection port 216, it can control the voltage conversion circuit 214 to work in the first working mode, and the battery 220 is in the discharging state; in the case that the voltage conversion module 210 obtains the second level signal output by the detection port 216, it can control the voltage conversion circuit 214 to work in the second working mode, and the battery 220 is in the discharging state or the charging state. The voltage conversion module 210 accurately detects whether the charging interface 232 is connected to the power supply device 300 through the detection port, and flexibly switches the working mode of the voltage conversion circuit 214, thereby improving the flexibility and accuracy of the voltage conversion circuit 214 switching between the first working mode and the second working mode.

[0089] In some embodiments, the charging management module 230 can further include a charging management unit 234, which can be connected with the charging interface 232, the bypass circuit 212 and the voltage conversion circuit 214 in the voltage conversion module 210, and the load 240, respectively. Further, a first end of the charging management unit 234 can be connected with the charging interface 232, a second end of the charging management unit 234 can be connected with the second end of the voltage conversion module 210 (i.e. the bypass circuit 212 and the voltage conversion circuit 214), and a third end of the charging management unit 234 can be connected with the load 240. Wherein, the first end of the charging management unit 234 can be an input end, the third end of the charging management unit 234 can be an output end, and the second end of the voltage conversion module 210 can be an input end or an output end.

[0090] The charging management unit 234 is configured to perform conversion processing on the voltage provided by the power supply device 300 to obtain a third voltage, and output the third voltage to the load 240 and / or the battery 220.

[0091] In the case that the power supply device 300 is connected to the charging interface 232, the voltage provided by the power supply device 300 is transmitted to the charging management unit 234 through the charging interface 232. The charging management unit 234 can include a DC-DC circuit, a charge pump circuit, etc. The charging management unit 234 can perform conversion processing on the voltage provided by the power supply device 300 to obtain a third voltage. In the case that the battery 220 is in a discharging state, the charging management unit 234 outputs the third voltage to the load 240 to supply power to the load 240 together with the battery 220. In the case that the battery 220 is in a charging state, the charging management unit 234 outputs the third voltage to the load 240 and the voltage conversion module 210 respectively, to supply power to the load 240 and charge the battery 220 through the voltage conversion module 210.

[0092] Optionally, in the case that the power supply device 300 is not connected to the charging interface 232, the charging management module 230 can be powered by the battery 220, and in the case that the power supply device 300 is connected to the charging interface 232, the charging management module 230 can be powered by the power supply device 300, so as to ensure the normal operation of the charging management module 230.

[0093] It should be noted that the conversion processing performed by the charging management unit 234 on the voltage provided by the power supply device 300 can be voltage boosting processing or voltage reducing processing, which can be determined according to the required supply voltage of the load and the voltage provided by the power supply device 300. The voltage provided by the power supply device 300 can be converted into the required supply voltage of the load 240 through the charging management unit 234, so as to ensure the normal operation of the load 240 and achieve charging of the battery 220.

[0094] Exemplarily, Figure 4 is a circuit schematic diagram of a power supply circuit in one embodiment. As Figure 4 shown, the voltage conversion module 210 can include a bypass circuit 212, a voltage conversion circuit 214, and a detection port Vbus. The charging management module 230 includes a charging interface 232 and a charging management unit 234, and the charging management unit 234 includes a charging DC-DC circuit and a BAT FET. The input end of the charging DC-DC circuit is connected to the charging interface 232. The first end of the BAT FET is connected to the bypass circuit 212 and the voltage conversion circuit 214 of the voltage conversion module 210, and the second end of the BAT FET is connected to the output end of the charging DC-DC circuit and the load 240.

[0095] In the case that the charging interface 232 is not connected to the power supply device 300, the BAT FET of the charging management unit 234 is turned on and the BAT FET is in the first transmission direction (the electric energy is transmitted from the first end of the BAT FET to the second end of the BAT FET), and the charging DC-DC circuit of the charging management unit 234 is not working. The first voltage (Vbat) output by the battery 220 is transmitted to the charging management module 230 through the voltage conversion module 210, and then transmitted to the load 240 through the BAT FET to supply power to the load 240. Further, when the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, and the voltage Vsys transmitted to the load 240 can be equal to the first voltage Vbat provided by the battery 220 without considering the voltage drop generated by the line. Further, when the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass circuit 212 is turned off, the first voltage Vbat provided by the battery 220 is boosted by the voltage conversion circuit 214 to obtain a second voltage, and the voltage Vsys transmitted to the load 240 is equal to the second voltage output by the voltage conversion circuit 214 to ensure the normal work of the load 240.

[0096] In the case that the charging interface 232 is connected to the power supply device 300, if the power supply current required by the load 240 is small, the BAT FET of the charging management unit 234 is turned on and is in the second transmission direction (the electric energy is transmitted from the second end of the BAT FET to the first end of the BAT FET), and the load 240 is powered by the power supply device 300 alone. The voltage input by the power supply device 300 through the charging interface 232 is processed by the charging DC-DC circuit to obtain a third voltage, and is output to the load 240 and transmitted to the voltage conversion module 210 through the BAT FET, and then the battery 220 is charged by the voltage conversion module 210. Further, when the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, and the third voltage output by the charging DC-DC circuit is equal to the charging voltage of the battery 220 without considering the voltage drop generated by the line; when the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass circuit 212 is turned off, the third voltage output by the charging DC-DC circuit is stepped down by the voltage conversion circuit 214 to obtain a fourth voltage, and then the fourth voltage is transmitted to the battery 220 to charge the battery 220, while ensuring the normal work of the load 240.

[0097] When charging port 232 is connected to power supply device 300, if load 240 requires a high current, the BAT FET of charging management unit 234 is turned on and in the first transmission direction, powering load 240 via both battery 220 and power supply device 300. The first voltage (Vbat) output by battery 220 is transmitted to charging management module 230 via voltage conversion module 210, and then transmitted to load 240 via the BAT FET. The voltage input from power supply device 300 via charging port 232 is converted by the charging DC-DC circuit to generate a third voltage, which is then output to load 240.

[0098] like Figure 6 As shown, in some embodiments, the voltage conversion module 210 also includes a control unit 218, which can be connected to the bypass circuit 212 and the voltage conversion circuit 214 respectively. The control unit 218 can control the conduction and disconnection of the bypass circuit 212, and can also control the working state of the voltage conversion circuit 214.

[0099] The control unit 218 is used to control the bypass circuit 212 to be turned on and the voltage conversion circuit 214 to be turned off when the battery voltage of the battery 220 is greater than the first voltage threshold; and to control the bypass circuit 212 to be turned off and the voltage conversion circuit 214 to be turned on when the battery voltage of the battery 220 is less than or equal to the first voltage threshold.

[0100] Control unit 218 can obtain the battery voltage of battery 220 and determine whether the battery voltage of battery 220 is greater than a first voltage threshold. If the battery voltage of battery 220 is greater than the first voltage threshold, control unit 218 can control bypass circuit 212 to be conductive and control voltage conversion circuit 214 to be inoperative. Furthermore, control unit 218 can control voltage conversion circuit 214 to be inoperative by controlling all switching devices in voltage conversion circuit 214 to be in an OFF state and not inputting a drive signal to voltage conversion circuit 214. If the battery voltage of battery 220 is not greater than the first voltage threshold, control unit 218 can control bypass circuit 212 to be in an OFF state and control voltage conversion circuit 214 to be inoperative. Furthermore, control unit 218 can control voltage conversion circuit 214 to be inoperative by controlling voltage conversion circuit 214 to be in a first operating mode or a second operating mode, and can also control the operating frequency and / or duty cycle of voltage conversion circuit 214.

[0101] As an implementation, the power supply circuit 200 can further comprise a second voltage sampling module 250, which can be connected with the first end of the voltage conversion module 210 and the control unit 218 respectively. The second voltage sampling module 250 can collect the voltage of the first end of the voltage conversion module 210 to obtain a second voltage sampling signal, which can be used to represent the voltage of the first end of the voltage conversion module 210, i.e., to represent the battery voltage of the battery 220.

[0102] For example, the second voltage sampling signal can be equal to the voltage of the first end of the voltage conversion module 210, or can be a voltage signal obtained by voltage division of the voltage of the first end of the voltage conversion module 210.

[0103] The second voltage sampling module 250 can transmit the second voltage sampling signal to the control unit 218. Since the voltage of the first end of the voltage conversion module 210 is equal to or close to the battery voltage of the battery 220, the control unit 218 can determine whether the battery voltage of the battery 220 is greater than the first voltage threshold according to the second voltage sampling signal. Alternatively, the second voltage sampling signal is equal to the voltage of the first end of the voltage conversion module 210, and the control unit 218 can convert the second voltage sampling signal into a voltage value through an analog-to-digital converter, which is the battery voltage of the battery 220. The voltage value can be compared with the first voltage threshold, and it is determined whether the voltage value is greater than the first voltage threshold. In this way, it can be more accurate to determine whether the battery voltage of the battery 220 is greater than the first voltage threshold.

[0104] Alternatively, the second voltage sampling signal can be a voltage signal obtained by voltage division of the voltage of the first end of the voltage conversion module 210, and the control unit 218 can compare the second voltage sampling signal with a first reference voltage through a comparator, which can be generated according to the first voltage threshold. If it is determined by the comparator that the second voltage sampling signal is greater than the first reference voltage, it indicates that the battery voltage of the battery 220 is greater than the first voltage threshold. If it is determined by the comparator that the second voltage sampling signal is not greater than the first reference voltage, it indicates that the battery voltage of the battery 220 is not greater than the first voltage threshold. In this way, the circuit is simpler, and the complexity of the circuit can be reduced.

[0105] It should be noted that the way in which the control unit 218 determines whether the battery voltage of the battery 220 is greater than the first voltage threshold according to the second voltage sampling signal is not limited to the above-mentioned several ways, and other ways can also be used for determination. The voltage conversion module 210 can accurately control the conduction and disconnection of the bypass circuit 212 and the working state of the voltage conversion circuit 214 through the control unit 218, thereby improving the running accuracy of the voltage conversion module 210.

[0106] In some embodiments, the control unit 218 can also be connected with the detection port 216. The control unit 218 can control the working mode of the voltage conversion circuit 214 according to the level signal output by the detection port 216. In the case that the detection port 216 outputs a first voltage signal to the control unit 218, it indicates that the charging interface 232 is not connected to the power supply device 300, and then the control unit 218 can control the voltage conversion circuit 214 to be in the first working mode in the case that the battery voltage of the battery 220 is not greater than the first voltage threshold. In the case that the detection port 216 outputs a second voltage signal to the control unit 218, it indicates that the charging interface 232 is connected to the power supply device 300, and then the control unit 218 can control the voltage conversion circuit 214 to be in the second working mode in the case that the battery voltage of the battery 220 is not greater than the first voltage threshold.

[0107] In some embodiments, in order to ensure the stability of the power supply to the load 240, the voltage at the second end of the voltage conversion module 210 can be maintained unchanged. As shown in Figure 6 The power supply circuit 200 further includes a first voltage sampling module 260 connected with the second end of the voltage conversion module 210 and the control unit 218 respectively.

[0108] The first voltage sampling module 260 is configured to collect the voltage at the second end of the voltage conversion module 210 to obtain a first voltage sampling signal.

[0109] The control unit 218 is configured to, in the case that the battery voltage of the battery 220 is less than or equal to the first voltage threshold, generate a driving signal of the voltage conversion circuit 214 according to the first voltage sampling signal and the target voltage, and drive the voltage conversion circuit 214 to work according to the driving signal, so as to maintain the voltage at the second end of the voltage conversion module 210 at the target voltage.

[0110] The first voltage sampling module 260 can collect the voltage at the second end of the voltage conversion module 210 to obtain a first voltage sampling signal. Further, the voltage at the second end of the voltage conversion module 210 can be collected by the first voltage sampling module 260 in the case that the voltage conversion circuit 214 works.

[0111] In the case that the battery 220 is in the discharging state, the voltage at the second end of the voltage conversion module 210 is equal to the output voltage of the voltage conversion module 210, and further, in the case that the voltage conversion circuit 214 works, the voltage at the second end of the voltage conversion module 210 is equal to the second voltage obtained after the voltage conversion circuit 214 boosts. In the case that the battery 220 is in the charging state, the voltage at the second end of the voltage conversion module 210 is equal to the third voltage output by the charging management module 230.

[0112] The first voltage sampling signal can be equal to the voltage at the second end of the voltage conversion module 210, or can be a voltage signal obtained by voltage division of the voltage at the second end of the voltage conversion module 210.

[0113] The first voltage sampling module 260 can transmit the first voltage sampling signal to the control unit 218, and the control unit 218 can perform closed-loop control on the voltage conversion circuit 214 according to the first voltage sampling signal and a target voltage. The control unit 218 can determine whether the voltage at the second end of the voltage conversion module 210 is equal to the target voltage according to the first voltage sampling signal and the target voltage. The target voltage can refer to the desired supply voltage of the load 240, and the target voltage can be greater than or equal to a first voltage threshold, for example, the first voltage threshold is 3V, and the target voltage can be 4V, 5V, etc., but is not limited thereto.

[0114] Alternatively, the first voltage sampling signal is equal to the voltage at the second end of the voltage conversion module 210, and the control unit 218 can convert the first voltage sampling signal into a voltage value through an analog-to-digital converter, the voltage value is the voltage at the second end of the voltage conversion module 210, and the voltage value can be compared with the target voltage, and a driving signal of the voltage conversion circuit 214 can be generated according to the comparison result.

[0115] Alternatively, the first voltage sampling signal can be a voltage signal obtained by voltage division of the voltage at the second end of the voltage conversion module 210. The control unit 218 can compare the first voltage sampling signal with a second reference voltage through a comparator, the second reference voltage can be generated according to the target voltage, and a driving signal of the voltage conversion circuit 214 can be generated according to the comparison result output by the comparator.

[0116] The driving signal of the voltage conversion circuit 214 can be used to drive at least part of the switching devices in the voltage conversion circuit 214 to conduct, and the driving signal of the voltage conversion circuit 214 can include but is not limited to a PWM (Pulse Width Modulation) signal, etc. The control unit 218 can determine the duty cycle of the PWM signal according to the first voltage sampling signal and the target voltage, and by adjusting the duty cycle of the PWM signal input to the voltage conversion circuit 214, the voltage at the second end of the voltage conversion circuit 214 (i.e. the second end of the voltage conversion module 210) can approach the target voltage.

[0117] For example, as shown in FIG. 2, the voltage conversion module 210 can include a voltage conversion circuit 214 and a first voltage sampling module 260. Figure 7As shown, the control unit 218 can achieve closed-loop control of the voltage conversion circuit 214 according to the first voltage sampling signal and the target voltage, and adjust the duty cycle of the PWM signal input to the voltage conversion circuit 214. For example, when it is determined according to the first voltage sampling signal and the target voltage that the voltage at the second end of the voltage conversion circuit 214 is greater than the target voltage, the duty cycle of the PWM signal can be reduced to reduce the voltage at the second end of the voltage conversion circuit 214; when it is determined according to the first voltage sampling signal and the target voltage that the voltage at the second end of the voltage conversion circuit 214 is less than the target voltage, the duty cycle of the PWM signal can be increased to increase the voltage at the second end of the voltage conversion circuit 214, so that the voltage at the second end of the voltage conversion circuit 214 approaches the target voltage.

[0118] For another example, when it is determined according to the first voltage sampling signal and the target voltage that the voltage at the second end of the voltage conversion circuit 214 is greater than the target voltage, the duty cycle of the PWM signal can be increased to reduce the voltage at the second end of the voltage conversion circuit 214; when it is determined according to the first voltage sampling signal and the target voltage that the voltage at the second end of the voltage conversion circuit 214 is less than the target voltage, the duty cycle of the PWM signal can be reduced to increase the voltage at the second end of the voltage conversion circuit 214, so that the voltage at the second end of the voltage conversion circuit 214 approaches the target voltage. The relationship between the duty cycle of the PWM signal and the voltage at the second end of the voltage conversion circuit 214 is affected by the specific circuit topology of the voltage conversion circuit 214, which is not limited herein.

[0119] In the embodiments of the present application, the voltage conversion module 210 achieves closed-loop control of the voltage conversion circuit 214 based on the first voltage sampling signal and the target voltage through the control unit 218, so that when the battery voltage of the battery 220 is small, the voltage at the second end of the voltage conversion module 210 is maintained at the target voltage, ensuring the working stability of the load 240 and preventing the load 240 from failing to work normally, thereby improving the stability of system operation.

[0120] In some embodiments, the voltage conversion circuit 214 described above can include a single-phase or multi-phase boost circuit. The multi-phase boost circuit can be connected in parallel. By connecting the multi-phase boost circuit in parallel, the output power of the voltage conversion circuit 214 can be increased. Alternatively, when the battery voltage of the battery 220 is less than or equal to the first voltage threshold, the multi-phase boost circuit can work in phase, which can simplify the control mode of the voltage conversion circuit 214.

[0121] Optionally, when the battery voltage of the battery 220 is less than or equal to the first voltage threshold, the multi-phase boost circuit can work in a phase error mode. Further, the adjacent two-phase boost circuits are separated by a target phase. Optionally, the target phase can be a preset fixed phase, for example, 60° between the adjacent two-phase boost circuits; the target phase can also be determined according to the number of phases of the boost circuit. For example, the target phase can be equal to 360° divided by the number of phases of the boost circuit, for example, when the number of phases of the boost circuit is 2, the target phase can be 180°; when the number of phases of the boost circuit is 3, the target phase can be 120°, and the like, but not limited thereto. The multi-phase boost circuit working in the phase error mode can reduce the voltage ripple of the voltage conversion circuit 214 output and enhance the transient response capability.

[0122] Further, the boost circuit can include an inductor and a switch group, the inductor is connected with the switch group, each switch in the switch group is switched between conduction and cut-off, and the inductor is charged to store energy or discharged to release energy, so as to maintain the stability of the voltage output by the boost circuit.

[0123] Optionally, the multi-phase boost circuit working in the phase error mode can also adopt a coupled inductor scheme. In the multi-phase boost circuit, the inductors included in each adjacent two-phase boost circuit are coupled to form a coupled inductor. The coupled inductor can include a first coil and a second coil, and the inductors in the adjacent two-phase boost circuit are respectively the first coil and the second coil. The two inductors included in the adjacent two-phase boost circuit can be integrated into a coupled inductor. The coupled inductor scheme can reduce the inductor package and improve the working efficiency of the voltage conversion circuit 214.

[0124] Figure 8A A circuit schematic diagram of the voltage conversion circuit 214 in one embodiment is shown. As an implementation, as shown in FIG. 2, the voltage conversion circuit 214 can include a four-phase boost circuit and a bypass circuit 212, the bypass circuit 212 includes a bypass switch QP, and the four-phase boost circuit is connected in parallel. Figure 8A

[0125] Each phase boost circuit includes an inductor L2 and a switch group, the switch group includes a first switch Q11 and a second switch Q12, the connection midpoint of the first switch Q11 and the second switch Q12 is connected with the first end of the inductor L2, and the second end of the inductor L2 is connected with the battery 220.

[0126] When the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass switch QP is turned on, and the four-phase boost circuit does not work.

[0127] ​When the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass switch QP is off, and the four-phase boost circuit works. When the battery 220 is in a discharging state, the first switch Q11 and the second switch Q12 can be switched between on and off. When the second switch Q12 is on and the first switch Q11 is off, the inductor L2 is charged to store energy. When the second switch Q12 is off and the first switch Q11 is on, the inductor L2 is discharged to release energy, so as to realize the boost processing of the first voltage (i.e., Vbat) provided by the battery 220. When the battery 220 is in a charging state, the first switch Q11 and the second switch Q12 can be switched between on and off. When the first switch Q11 is on and the second switch Q12 is off, the inductor L2 is charged to store energy. When the first switch Q11 is off and the second switch Q12 is on, the inductor L2 is discharged to release energy, so as to realize the boost processing of the third voltage output by the charging management module 230.

[0128] Further, the control unit 218 can adjust the duty cycle of the boost circuit according to the first voltage sampling signal corresponding to the voltage (i.e., Vsys) of the second end of the voltage conversion circuit 214 and the target voltage. The duty cycle can refer to the proportion of the on duration of the first switch Q11 in the cycle duration of each working cycle, or the duty cycle can refer to the proportion of the on duration of the second switch Q12 in the cycle duration of each working cycle.

[0129] Alternatively, the four-phase boost circuit can work in a staggered phase manner. The on time of the first switch Q11 in adjacent two-phase boost circuits can be separated by a target phase, and / or the on time of the second switch Q12 in adjacent two-phase boost circuits can be separated by a target phase, so as to reduce the capacitor voltage ripple and enhance the response capability in transient state.

[0130] Further, the four-phase boost circuit can use a coupled inductor, as shown in Figure 8B Two inductors L2 in adjacent boost circuits can be a first coil and a second coil of a coupled inductor, respectively, and the two inductors L2 in adjacent boost circuits can be integrated into a coupled inductor.

[0131] In the embodiments of the present application, the voltage conversion circuit 214 shown in Figure 8A or Figure 8B can improve the output power of the voltage conversion circuit 214, meet the power consumption demand of the whole electronic device, and realize bidirectional power transmission, so as to meet the charging and discharging demand of the battery 220 and the power supply demand of the load 240 in different situations, and improve the endurance of the electronic device and the use experience of the battery 220 in low power.

[0132] Figure 9A The circuit schematic diagram of the voltage conversion circuit 214 in another embodiment is shown in Figure 9AAs shown, the voltage conversion circuit 214 can include two-phase boost circuits and a bypass circuit 212, the bypass circuit 212 including a bypass switch QP, the two-phase boost circuits being connected in parallel.

[0133] Each phase boost circuit includes an inductor L3, a switch group, and a first capacitor C1, the first capacitor C1 being respectively connected with the switch group and a first end of the inductor L3, a second end of the inductor L3 being connected with the charge management module 230. Each switch in the switch group is switched between being turned on and being turned off, and the first capacitor C1 is charged or discharged to make the voltage at the first end of the inductor L3 greater than or equal to the battery voltage of the battery 220. By charging or discharging the first capacitor C1, the voltage at the first end of the inductor L3 can be changed so that the voltage at the first end of the inductor L3 is greater than or equal to the battery voltage of the battery 220. When the battery 220 is in a discharging state, the average voltage at the first end of the inductor L3 is increased in a working cycle while the output power of the boost circuit remains unchanged, which can reduce the inductor current input to the inductor, thereby greatly reducing the volume of the inductor, reducing the area of the boost circuit on the circuit board, and reducing the cost.

[0134] Further, the switch group includes a third switch Q3, a fourth switch Q4, and a fifth switch Q5, the third switch Q3, the fourth switch Q4, and the fifth switch Q5 being connected in series, a connection midpoint of the third switch Q3 and the fourth switch Q4 being connected with the battery 220, a connection midpoint of the fourth switch Q4 and the fifth switch Q5 being connected with the first end of the first capacitor C1, and the third switch Q3 being further connected with the first end of the inductor L3 and a second end of the first capacitor C1, respectively.

[0135] When the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass switch QP is turned on, and the two-phase boost circuits do not work.

[0136] When the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass switch QP is turned off, and the two-phase boost circuits work. When the boost circuit works, the boost circuit can include two working modes, in which, in a first time period in a working cycle, the boost circuit is in a first working mode, and in a second time period, the boost circuit is in a second working mode.

[0137] When the battery 220 is in discharging state, in the first time period of the working cycle, the boost circuit is in the first working mode, the third switch Q3 and the fifth switch Q5 are turned on, the fourth switch Q4 is turned off, the first end of the first capacitor C1 is grounded through the fifth switch Q5, the first voltage provided by the battery 220 charges the first capacitor C1 and the inductor L3, the first capacitor C1 is in parallel with the capacitor at the end of the battery 220, and when stable, the voltage at the second end of the first capacitor C1 (i.e. the voltage at the first end of the inductor L3) is equal to the first voltage provided by the battery 220 (i.e. Vbat), and in the case of no loss, the capacitor voltage VC1 of the first capacitor C1 is equal to the first voltage output by the battery 220 (i.e. Vbat).

[0138] In the second time period of the working cycle, the boost circuit is in the second working mode, the third switch Q3 and the fifth switch Q5 are turned off, the fourth switch Q4 is turned on, the first capacitor C1 and the inductor L3 are in series, the first capacitor C1 and the inductor L3 are discharged, and the voltage at the first end of the inductor L3 is equal to the sum of the first voltage output by the battery 220 (i.e. Vbat) and the capacitor voltage VC1 of the first capacitor C1. Since the capacitor voltage VC1 of the first capacitor C1 is equal to the first voltage output by the battery 220 when entering the second time period, the voltage at the first end of the inductor L3 is equal to twice the first voltage output by the battery 220, i.e. the voltage V1 at the first end of the inductor L3 = 2*Vbat.

[0139] Suppose that in a working cycle, the duty ratios of the boost circuit in the first working mode and in the second working mode are D and 1-D respectively, based on the inductance-based volt-second balance principle, Vsys = Vbat*D + 2Vbat*(1-D) = Vbat*(2-D) can be obtained, where 0 < D < 1.

[0140] Further, the control unit 218 can adjust the duty ratio of the boost circuit according to the first voltage sampling signal corresponding to the voltage (i.e. Vsys) at the second end of the voltage conversion circuit 214 and the target voltage, so that Vsys can change between Vbat and twice Vbat.

[0141] When the battery 220 is in charging state, the working principle of the boost circuit is similar to that when the battery 220 is in discharging state, and the duty ratio D can be adjusted to achieve the change of Vsys between Vbat and twice Vbat through the formula Vsys = Vbat*D + 2Vbat*(1-D) = Vbat*(2-D), but when the battery 220 is in charging state, Vbat can be considered as the charging voltage input to the battery 220.

[0142] Optionally, the two-phase boost circuit can operate in a phase error manner, the turn-on time of the third switch Q3 in the boost circuit of the adjacent two phases can be spaced by a target phase, and / or the turn-on time of the fourth switch Q4 in the boost circuit of the adjacent two phases can be spaced by a target phase, thereby reducing the capacitor voltage ripple and enhancing the response capability of the transient state.

[0143] Further, the four-phase boost circuit can adopt a coupled inductor, as shown in Figure 9B As shown, the two inductors L3 in the adjacent boost circuits can be a first coil and a second coil of a coupled inductor respectively, and the two inductors L3 in the adjacent boost circuits can be integrated into a coupled inductor.

[0144] In the embodiments of the present application, the voltage conversion circuit 214 shown in Figure 9A or Figure 9B As shown, the voltage conversion circuit 214 can improve the output power of the voltage conversion circuit 214, meet the power consumption demand of the whole electronic device, and realize bidirectional power transmission, meet the charging and discharging demand of the battery 220 and the power supply demand of the load 240 in different situations, and improve the endurance of the electronic device and the use experience of the battery 220 under low power.

[0145] It should be noted that the connection midpoint provided in the above embodiments refers to any node on the connection circuit of two series-connected devices, which can be used to connect with other circuits or electronic devices, and is not necessarily the center point of the connection circuit between the two devices. For example, the connection midpoint of the third switch Q3 and the fourth switch Q4 can be any node on the connection circuit of the third switch Q3 and the fourth switch Q4, and is not necessarily the center point of the connection circuit between the third switch Q3 and the fourth switch Q4.

[0146] The switching devices (such as the first switch Q11, the second switch Q12, the bypass switch QP, the third switch Q3, etc.) involved in the above embodiments can include but are not limited to one or more of MOS tubes, GaN (gallium nitride) switches, SiC (silicon carbide) switches, etc. The MOS tube can be an N-type MOS tube or a P-type MOS tube.

[0147] In some embodiments, due to the limited boost capability of the voltage conversion circuit 214 in the voltage conversion module 210, the boost module is still needed to supply power for the first load with high UVLO. As shown in Figure 10 The power supply circuit can further include a boost module 270, which can be connected with the output end of the charge management module 230 and the first load.

[0148] The voltage boosting module 270 is configured to boost the voltage output by the charging management module 230 to obtain a fifth voltage when the voltage output by the charging management module 230 is less than a second voltage threshold, and the fifth voltage is used to supply power to the first load; the second voltage threshold is greater than the first voltage threshold.

[0149] When the charging management module 230 is not connected to the power supply device 300, the voltage output by the charging management module 230 can be equal to the voltage output by the voltage conversion module 210 without considering line loss. When the charging management module 230 is connected to the power supply device 300, the voltage output by the charging management module 230 can be the third voltage in the above-mentioned embodiments.

[0150] Further, the voltage boosting module 270 can include a bypass switch and a voltage boosting circuit, and the bypass switch and the voltage boosting circuit are connected in parallel.

[0151] When the voltage output by the charging management module 230 is greater than the second voltage threshold, it indicates that the voltage output by the charging management module 230 can meet the power supply requirement of the first load, and then the voltage boosting module 270 can turn on the bypass switch and the voltage boosting circuit is not in operation. The voltage output by the charging management module 230 is directly transmitted to the first load through the turned-on bypass switch, and the first load is supplied with power by the voltage output by the charging management module 230.

[0152] When the voltage output by the charging management module 230 is not greater than the second voltage threshold, it indicates that the voltage output by the charging management module 230 cannot meet the power supply requirement of the first load, and then the voltage boosting module 270 can turn off the bypass switch and the voltage boosting circuit is in operation. The voltage boosting circuit can boost the voltage output by the charging management module 230 to obtain the fifth voltage, and the first load is supplied with power based on the fifth voltage.

[0153] It should be noted that the working mode of the bypass switch and the voltage boosting circuit in the voltage boosting module 270 can be similar to the working mode of the voltage conversion module 210 when the battery 220 is in the discharging state as described in the above-mentioned embodiments, which will not be repeated here.

[0154] Exemplarily, the circuit topology of the voltage boosting module 270 can adopt the circuit topology structure as shown in FIG. 3A; the circuit topology of the voltage boosting module 270 can also adopt the circuit topology structure as shown in FIG. 3B or FIG. 3C, and the voltage boosting circuit in the voltage boosting module 270 can be single-phase or multi-phase, which is not limited here. Figure 1B Figure 8A Figure 9A

[0155] ​​​By combining the voltage conversion module 210 with the voltage boosting module 270, the battery 220 can be allowed to output a lower battery voltage, reduce the use limit of the battery 220 at a low power level, release more capacity of the battery, ensure the normal operation of the first load with a high UVLO, and improve the overall performance and use experience of the electronic device.

[0156] In some embodiments, the present application also provides a power supply circuit 200, which can be the power supply circuit 200 described in any of the above embodiments.

[0157] In some embodiments, the present application also provides a chip, which can include the voltage conversion module 210 described in any of the above embodiments, or include the power supply circuit 200 described in any of the above embodiments.

[0158] In some embodiments, the present application also provides an electronic device, which can include the voltage conversion module 210 described in any of the above embodiments, or include the power supply circuit 200 described in any of the above embodiments, or include the chip described in any of the above embodiments.

[0159] Optionally, the electronic device can include, but is not limited to, a mobile phone, a wearable device, a tablet computer, a notebook computer, a smart home device, etc.

[0160] As shown in Figure 11 In some embodiments, a voltage conversion method is provided, which can be applied to the voltage conversion module 210 described above, or applied to the power supply circuit 200 described above, or applied to the chip described above, or applied to the electronic device described above. The method can include the following steps:

[0161] Step 1110, in the case where the battery voltage of the battery is greater than the first voltage threshold, transmitting the first voltage provided by the battery to the charge management module through the bypass circuit of the voltage conversion module to supply power to the load.

[0162] Step 1120, in the case where the battery voltage of the battery is less than or equal to the first voltage threshold, performing voltage boosting processing on the first voltage provided by the battery through the voltage conversion circuit of the voltage conversion module to obtain a second voltage, and transmitting the second voltage to the charge management module to supply power to the load.

[0163] In the case where the charge management module is not connected to the power supply device, the direction of the electrical energy transmission of the voltage conversion module is the first direction;

[0164] In the case where the charge management module is connected to the power supply device, the direction of the electrical energy transmission of the voltage conversion module is the first direction or the second direction;

[0165] The first direction is from the first end of the voltage conversion module to the second end of the voltage conversion module, and the second direction is from the second end of the voltage conversion module to the first end of the voltage conversion module.

[0166] In some embodiments, the step 1110 comprises: if the battery voltage of the battery is greater than the first voltage threshold, transmitting the first voltage provided by the battery to the charging management module through the bypass circuit to supply power to the charging management module and the load, in the case that the charging management module is not connected to the power supply device.

[0167] The step 1120 comprises: if the battery voltage of the battery is less than or equal to the first voltage threshold, performing voltage boosting processing on the first voltage provided by the battery through the voltage conversion circuit to obtain a second voltage, and transmitting the second voltage to the charging management module to supply power to the charging management module and the load, in the case that the charging management module is not connected to the power supply device.

[0168] In some embodiments, the method further comprises: if the battery voltage of the battery is greater than the first voltage threshold, transmitting the first voltage provided by the battery to the charging management module through the bypass circuit to supply power to the load together with the charging management module, or transmitting the third voltage output by the charging management module to the battery through the bypass circuit to charge the battery, in the case that the charging management module is connected to the power supply device.

[0169] In the case that the charging management module is connected to the power supply device, if the battery voltage of the battery is less than or equal to the first voltage threshold, performing voltage boosting processing on the first voltage provided by the battery through the voltage conversion circuit to obtain a second voltage, and transmitting the second voltage to the charging management module to supply power to the load together with the charging management module, or performing voltage step-down processing on the third voltage output by the charging management module through the voltage conversion circuit to obtain a fourth voltage, and transmitting the fourth voltage to the battery to charge the battery.

[0170] In some embodiments, the method further comprises: controlling the voltage conversion circuit to be in a first working mode in the case that the charging management module is not connected to the power supply device, and controlling the voltage conversion circuit to be in a second working mode in the case that the charging management module is connected to the power supply device; and the working frequency of the voltage conversion circuit in the first working mode is less than the working frequency of the voltage conversion circuit in the second working mode.

[0171] In some embodiments, the method further comprises: detecting, through the detection port of the voltage conversion module, whether the charging interface in the charging management module is connected to the power supply device.

[0172] In some embodiments, the method further includes: in the case that the charging interface accesses the power supply device, transforming, by a charging management unit in the charging management module, a voltage provided by the power supply device to obtain a third voltage, and outputting the third voltage to the load and / or the battery.

[0173] In some embodiments, the method further includes: collecting, by the first voltage sampling module, a voltage at the second end of the voltage transformation module to obtain a first voltage sampling signal; in the case that the battery voltage of the battery is less than or equal to the first voltage threshold, generating a driving signal of the voltage transformation circuit according to the first voltage sampling signal and the target voltage, and driving the voltage transformation circuit to work according to the driving signal, so as to maintain the voltage at the second end of the voltage transformation module at the target voltage.

[0174] In some embodiments, the voltage transformation circuit includes a multi-phase boost circuit, and the method further includes: in the case that the battery voltage of the battery is less than or equal to the first voltage threshold, controlling the multi-phase boost circuit to work in different phases.

[0175] In some embodiments, the method further includes: in the case that the battery voltage of the battery is greater than the first voltage threshold, controlling the bypass circuit to be turned on, and controlling the voltage transformation circuit to not work; in the case that the battery voltage of the battery is less than or equal to the first voltage threshold, controlling the bypass circuit to be turned off, and controlling the voltage transformation circuit to work.

[0176] It should be noted that the description of the voltage transformation method provided in the embodiments of the present application can refer to the related description of the voltage transformation module or the power supply circuit provided in the above embodiments, which will not be repeated here.

[0177] In the embodiments of the present application, by setting the voltage transformation module between the battery and the charging management module, and by the voltage transformation circuit of the voltage transformation module boosting the first voltage output by the battery when the battery voltage of the battery is less than or equal to the first voltage threshold, only the second voltage obtained by the boosting needs to be greater than the UVLO voltage of the charging management module and the load, so that the charging management module and the load can work normally, thus the battery voltage can be made lower, the use of the battery at low power can be reduced, the capacity of the battery can be released more, and the endurance of the electronic device provided with the battery can be improved.

[0178] The embodiments of the present application disclose an electronic device, including a memory and a processor, the memory stores a computer program, and the computer program is executed by the processor to make the electronic device implement the method described in the above embodiments.

[0179] The embodiments of the present application disclose a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method described in the above embodiments.

[0180] The embodiment of the present application discloses a computer program product, comprising a computer program, and the computer program can be executed by a processor to realize the method described in the above embodiments.

[0181] It should be understood that, throughout the specification, the expression "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, appearances of the expressions "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It will also be appreciated by those of skill in the art that any one or more of the

[0182] In various embodiments of the present application, it should be understood that the size of the sequence number of the above processes does not mean the inevitable sequence of execution, and the execution sequence of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0183] The units described as separate components above can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on multiple network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment.

[0184] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0185] Each technical feature of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0186] The voltage conversion module, the power supply circuit, the chip, the electronic device and the voltage conversion method disclosed in the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above embodiment description is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A voltage conversion module, characterized by, The voltage conversion module is applied to a power supply circuit, the power supply circuit further comprises a battery, a charge management module and a load, the charge management module is connected with the load, and the charge management module is used for connecting a power supply device; a first end of the voltage conversion module is connected with the battery, and a second end of the voltage conversion module is connected with the charge management module; The voltage conversion module comprises: a bypass circuit; a voltage conversion circuit connected with the bypass circuit in parallel; The voltage conversion module is used for, in a case where a battery voltage of the battery is greater than a first voltage threshold, transmitting a first voltage provided by the battery to the charge management module through the bypass circuit to supply power to the load; and in a case where the battery voltage of the battery is less than or equal to the first voltage threshold, performing voltage boosting processing on the first voltage provided by the battery through the voltage conversion circuit to obtain a second voltage, and transmitting the second voltage to the charge management module to supply power to the load.

2. The voltage conversion module of claim 1, wherein, In a case where the charge management module is not connected with the power supply device, the power transmission direction of the voltage conversion module is a first direction; In a case where the charge management module is connected with the power supply device, the power transmission direction of the voltage conversion module is the first direction or a second direction; The first direction is from the first end of the voltage conversion module to the second end of the voltage conversion module, and the second direction is from the second end of the voltage conversion module to the first end of the voltage conversion module.

3. The voltage conversion module of claim 2, wherein: The voltage conversion module is further used for, in a case where the charge management module is not connected with the power supply device, if the battery voltage of the battery is greater than the first voltage threshold, transmitting the first voltage provided by the battery to the charge management module through the bypass circuit to supply power to the charge management module and the load. In a case where the charge management module is not connected with the power supply device, if the battery voltage of the battery is less than or equal to the first voltage threshold, performing voltage boosting processing on the first voltage provided by the battery through the voltage conversion circuit to obtain a second voltage, and transmitting the second voltage to the charge management module to supply power to the charge management module and the load.

4. The voltage conversion module of claim 2, wherein: The voltage conversion module is further used for, in a case where the charge management module is connected with the power supply device, if the battery voltage of the battery is greater than the first voltage threshold, transmitting the first voltage provided by the battery to the charge management module through the bypass circuit to supply power to the load together with the charge management module, or transmitting a third voltage output by the charge management module to the battery through the bypass circuit to charge the battery. In a case where the charging management module accesses the power supply device, if a battery voltage of the battery is less than or equal to the first voltage threshold, a first voltage provided by the battery is boosted by the voltage conversion circuit to obtain a second voltage, and the second voltage is transmitted to the charging management module to supply power to the load together with the charging management module, or a third voltage output by the charging management module is stepped down by the voltage conversion circuit to obtain a fourth voltage, and the fourth voltage is transmitted to the battery to charge the battery.

5. The voltage conversion module of claim 2, wherein, In a case where the charging management module does not access the power supply device, the voltage conversion circuit is in a first working mode; In a case where the charging management module accesses the power supply device, the voltage conversion circuit is in a second working mode; The working frequency of the voltage conversion circuit in the first working mode is less than the working frequency in the second working mode.

6. Voltage conversion module according to any one of claims 2 to 5, characterized in that The charging management module comprises a charging interface for connecting the power supply device; The voltage conversion module further comprises a detection port connected with the charging interface; The detection port is used to detect whether the charging interface accesses the power supply device.

7. The voltage conversion module of claim 6, wherein, The charging management module further comprises a charging management unit connected with the charging interface; The charging management unit is used to convert the voltage provided by the power supply device to obtain a third voltage, and output the third voltage to the load and / or the battery.

8. The voltage conversion module of claim 1, wherein, The power supply circuit further comprises a first voltage sampling module for collecting the voltage of the second end of the voltage conversion module to obtain a first voltage sampling signal; The voltage conversion module further comprises a control unit connected with the first voltage sampling module; The control unit is used to generate a driving signal of the voltage conversion circuit according to the first voltage sampling signal and a target voltage in a case where the battery voltage of the battery is less than or equal to the first voltage threshold, and drive the voltage conversion circuit to work according to the driving signal, so that the voltage of the second end of the voltage conversion module is maintained at the target voltage.

9. Voltage conversion module according to any of claims 1 to 5, 8, characterized in that The voltage conversion circuit comprises a multi-phase boost circuit connected in parallel; In a case where the battery voltage of the battery is less than or equal to the first voltage threshold, the multi-phase boost circuit works in a phase error mode.

10. The voltage conversion module of claim 9, wherein, The boost circuit comprises an inductor and a switch group, the inductor is connected with the switch group, each switch in the switch group is switched between conduction and cutting, and the inductor is charged to store energy or discharged to release energy to maintain the stability of the voltage output by the boost circuit; In the multi-phase boost circuit, the inductors included in each adjacent two-phase boost circuit are coupled to form a coupled inductor.

11. The voltage conversion module of claim 10, wherein, The switch group comprises a first switch and a second switch, and the first switch and the second switch are connected in series. A connection point of the first switch and the second switch is connected to a first end of the inductor, and a second end of the inductor is connected to the battery.

12. The voltage conversion module of claim 10, wherein, The voltage conversion module further comprises a first capacitor connected to the switch group and the first end of the inductor respectively, and a second end of the first capacitor is connected to the charge management module. Each switch in the switch group is switched between being turned on and being turned off, and the first capacitor is charged to store energy or discharged to release energy, so that the voltage at the first end of the inductor is greater than or equal to the battery voltage of the battery.

13. The voltage conversion module of claim 12, wherein, The switch group comprises a third switch, a fourth switch and a fifth switch, the third switch, the fourth switch and the fifth switch are connected in series, a connection point of the third switch and the fourth switch is connected to the battery, and a connection point of the fourth switch and the fifth switch is connected to the first end of the first capacitor. The third switch is further connected to the first end of the inductor and the second end of the first capacitor respectively.

14. The voltage conversion module of claim 1, wherein, The voltage conversion module further comprises a control unit connected to the bypass circuit and the voltage conversion circuit respectively. The control unit is configured to, in a case where the battery voltage of the battery is greater than a first voltage threshold, control the bypass circuit to be turned on and control the voltage conversion circuit to be inactivated, and in a case where the battery voltage of the battery is less than or equal to the first voltage threshold, control the bypass circuit to be turned off and control the voltage conversion circuit to be activated.

15. A power supply circuit, characterized by comprising: The voltage conversion module comprises: The voltage conversion module according to any one of claims 1-14; A load; A battery configured to provide a first voltage to the voltage conversion module; A charge management module connected to the load, the charge management module configured to be connected to a power supply device.

16. The power supply circuit of claim 15, wherein, The power supply circuit further comprises a voltage boosting module connected to the charge management module and the first load respectively, the first load being a load with an under-voltage lockout (UVLO) voltage greater than an UVLO threshold value. The voltage boosting module is configured to, in a case where the voltage output by the charge management module is less than a second voltage threshold value, boost the voltage output by the charge management module to obtain a fifth voltage, the fifth voltage being used to supply power to the first load. The second voltage threshold value is greater than the first voltage threshold value.

17. A chip comprising the voltage conversion module according to any one of claims 1-14, or comprising the power supply circuit according to any one of claims 15-16.

18. An electronic device, comprising: The voltage conversion module according to any one of claims 1-14, the power supply circuit according to any one of claims 15-16, or the chip according to claim 17.

19. A voltage conversion method, characterized by, The method comprises: In a case where the battery voltage of the battery is greater than a first voltage threshold value, transmitting the first voltage provided by the battery to the charge management module through the bypass circuit of the voltage conversion module to supply power to the load. In a case where the battery voltage of the battery is less than or equal to the first voltage threshold, a first voltage provided by the battery is boosted by a voltage conversion circuit of the voltage conversion module to obtain a second voltage, and the second voltage is transmitted to the charge management module to supply power to the load.

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