Power supply circuit and electronic device

Abstract

The present application relates to the technical field of circuits, and discloses a power supply circuit and an electronic device. In the power supply circuit, a first electronic component and a second electronic component are electronic components which generate large peak currents when working. The first electronic component is independent from an electric module and directly connected to a first battery, so that the impedance between the first electronic component and the first battery can be reduced, thereby reducing the voltage dropping formed when the first electronic component works and generates a peak current. The second electronic component is independent from the electric module and directly connected to a second battery, so that the voltage dropping formed when the second electronic component works and generates a peak current can be reduced. By reducing the voltage dropping formed when an electronic component works and generates a peak current, an undervoltage lockout mechanism of the electronic device can be prevented from being triggered, so that the working stability of the electronic device can be improved.

Description

Power supply circuits and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on September 22, 2023, with application number 202311227254.2 and application name “Power supply circuit and electronic equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of circuit technology, and in particular to a power supply circuit and electronic equipment. Background Art

[0003] Electronic devices such as mobile phones, tablets, and laptops may include two batteries, referred to as a first battery and a second battery. These devices also include a charge-discharge chip. During operation, the first and second batteries supply power to the electronic components within the electronic device through the charge-discharge chip.

[0004] In related technologies, an impedance module is further connected between the first battery and the second battery. By adjusting the impedance of the impedance module, the first battery and the second battery can output electrical energy to the charge and discharge chip at the same time.

[0005] However, due to the influence of the impedance module and the charge-discharge chip, the impedance between the first and second batteries and the electronic device is relatively high. In this case, when the electronic device generates a large peak current, a large voltage drop will occur in the power supply circuit, which can easily trigger the low-voltage lockout mechanism of the electronic device, which is not conducive to the stable operation of the electronic device.

[0006] Summary of the Invention

[0007] This application provides a power supply circuit and electronic equipment that can avoid a large voltage drop in the power supply circuit when the electronic device generates a large peak current, thereby improving the operating stability of the electronic device. The technical solution is as follows:

[0008] In a first aspect, a power supply circuit is provided. The power supply circuit is applied to electronic equipment and includes an impedance module, a first battery, a first electronic device, a charge-discharge chip, a second battery, a second electronic device, and a power module.

[0009] The power module may include one or more electronic devices. The first electronic device and the second electronic device are both other electronic devices outside the power module. When the electronic device is working, the first battery and / or the second battery needs to supply power to the first electronic device, the second electronic device and the electronic devices in the power module. In the present application, the peak current generated when the first electronic device is working is greater than or equal to the first threshold value. Here, the peak current refers to the difference between the maximum current value and the average current value generated when the electronic device is working. The first threshold is a current threshold used to determine whether the peak current generated when the electronic device is working is large. The peak current generated when the second electronic device is working is also greater than or equal to the first threshold value. In other words, both the first electronic device and the second electronic device will generate a large peak current when working.

[0010] The first electronic device is directly connected to the first battery, so that the first battery alone powers the first electronic device. The second electronic device is directly connected to the second battery, so that the second battery alone powers the second electronic device. The first end of the impedance module is connected to the first battery, the second end of the impedance module is connected to the second battery and the first end of the charge-discharge chip, and the second end of the charge-discharge chip is connected to the power-consuming module, so that the first and second batteries power one or more electronic devices in the power-consuming module through the charge-discharging chip.

[0011] In the present application, a power supply circuit includes an impedance module, a first battery, a first electronic device, a charge-discharge chip, a second battery, a second electronic device, and a power module. The first and second batteries jointly supply power to the power module via the charge-discharge chip. This increases the operating time of the power module compared to a case where only one of the first and second batteries supplies power to the power module via the charge-discharge chip, thereby ensuring the battery life of the electronic device to which the power supply circuit is applied. The first and second electronic devices are electronic devices that generate large peak currents during operation. The first electronic device is independent of the power module and directly connected to the first battery, rather than connected to the first battery through the charge-discharge chip or the impedance module. This reduces the impedance between the first electronic device and the first battery, thereby reducing the voltage drop generated when the first electronic device generates peak current. Similarly, the second electronic device is independent of the power module and directly connected to the second battery, which also reduces the voltage drop generated when the second electronic device generates peak current. By reducing the voltage drop generated when the electronic devices generate peak current, the low-voltage lockout mechanism of the electronic device can be avoided, thereby improving the operating stability of the electronic device. At the same time, the first battery and the second battery are both directly connected to the electronic device. Compared with only one of the first battery and the second battery being connected to the electronic device, it is more conducive to keeping the voltage difference between the two batteries small, thereby improving the working stability of the electronic device.

[0012] In some embodiments, the first electronic device and the second electronic device may both be audio power amplifiers or radio frequency power amplifiers.

[0013] In some embodiments, the first and second electronic devices each have a relatively high peak current and a relatively low mean current. Mean current refers to the average current value generated by the electronic device during operation. For example, the first and second electronic devices may each have an average current value less than or equal to a second threshold value during operation. The relatively high peak current and relatively low mean current here are relative to other electronic devices in the power-consuming module.

[0014] In some embodiments, the power module includes a plurality of electronic devices, and any one of the plurality of electronic devices in the power module has a relatively small peak current and a relatively large average current.

[0015] For example, the peak current of any one of the multiple electronic components in the power module is less than a third threshold value. Here, the third threshold value is less than or equal to the first threshold value. In other words, the peak current of any one of the multiple electronic components in the power module must be less than the first threshold value.

[0016] For example, the average current of any one of the multiple electronic components of the power module is greater than the fourth threshold value. Here, the fourth threshold value is greater than or equal to the second threshold value. In other words, the average current of any one of the multiple electronic components of the power module must be greater than the second threshold value.

[0017] In some embodiments, the rated capacity of the first battery and the rated capacity of the second battery are different. In this case, to minimize the voltage difference between the two batteries, the electronic device that consumes more power, of the first and second electronic devices, can be connected to the battery with the larger rated capacity, while the electronic device that consumes less power, of the first and second electronic devices, can be connected to the battery with the smaller rated capacity.

[0018] For example, in some specific embodiments, the rated capacity of the first battery is greater than the rated capacity of the second battery, and the power consumption of the first electronic device within a preset time period is greater than the power consumption of the second electronic device within the preset time period.

[0019] For another example, in some specific embodiments, the rated capacity of the first battery is greater than the rated capacity of the second battery. The average current of the first electronic device is greater than the average current of the second electronic device. In other words, when the average currents are unequal, the amount of power consumed by the electronic device during operation can be determined based on the magnitude of the average current generated by the electronic device during operation.

[0020] In other embodiments, the rated capacity of the first battery and the rated capacity of the second battery are different, and both the first battery and the second battery can be directly connected to multiple electronic devices. In this case, to minimize the voltage difference between the two batteries, the electronic devices connected to the battery with the larger rated capacity consume more power, while the electronic devices connected to the battery with the smaller rated capacity consume less power.

[0021] For example, in some specific embodiments, the power supply circuit further includes a third electronic device. The third electronic device is connected to the first battery. The sum of the power consumption of the first electronic device over a preset time period and the power consumption of the third electronic device over a preset time period is greater than the power consumption of the second electronic device over the preset time period.

[0022] In some embodiments, the impedance module includes a first transistor, a second transistor, and a controller. The first end of the first transistor is connected to the first battery and the first electronic device. The second end of the first transistor is connected to the first end of the second transistor. The second end of the second transistor is connected to the first end of the charge-discharge chip, the second battery, and the second electronic device. The controller is connected to the control end of the first transistor and the control end of the second transistor. The controller is configured to control the voltages of the control end of the first transistor and the control end of the second transistor so that the voltage output by the first battery to the first end of the charge-discharge chip through the impedance module is equal to the voltage output by the second battery to the first end of the charge-discharge chip.

[0023] In some embodiments, the impedance module further includes: a first resistor, a third transistor, a first capacitor, a second resistor, a second capacitor, and a third resistor. The first end of the first resistor is connected to the second end of the first transistor and the first end of the second transistor. The second end of the first resistor is connected to the first end of the third transistor, the control end of the first transistor, and the control end of the second transistor, and the second end of the third transistor is connected to the ground line. The first plate of the first capacitor is connected to the first end of the third transistor, and the second plate of the first capacitor is connected to the second end of the third transistor. The first end of the second resistor is connected to the controller, and the second end of the second resistor is connected to the control end of the third transistor. The first plate of the second capacitor is connected to the control end of the third transistor, and the second plate of the second capacitor is connected to the second end of the third transistor. The first end of the third resistor is connected to the control end of the third transistor, and the second end of the third resistor is connected to the second end of the third transistor.

[0024] In a second aspect, an electronic device is also provided, comprising a power supply circuit as described in any one of the first aspects.

[0025] In some embodiments, an electronic device includes a first structural member and a second structural member. The first structural member and the second structural member are movably connected. An impedance module, a first battery, and a first electronic device are located in the first structural member. A second battery and a second electronic device are located in the second structural member. A charging and discharging chip is located in either the first structural member or the second structural member.

[0026] In some embodiments, the charge-discharge chip is located in the first structural component; the second battery is connected to the first end of the charge-discharge chip via a flexible circuit board.

[0027] The technical effect obtained by the above-mentioned second aspect is similar to the technical effect obtained by the corresponding technical means in the above-mentioned first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of the appearance of an electronic device along a first direction in the related art;

[0029] FIG2 is a schematic diagram of the appearance of an electronic device along a second direction in the related art;

[0030] FIG3 is a schematic diagram of the internal structure of an electronic device in the related art;

[0031] FIG4 is a circuit structure diagram of a power supply circuit of an electronic device in the related art;

[0032] FIG5 is a circuit structure diagram of a first power supply sub-circuit in the related art;

[0033] FIG6 is a circuit structure diagram of a second power supply sub-circuit in the related art;

[0034] FIG7 is a circuit structure diagram of a first power supply circuit provided in an embodiment of the present application;

[0035] FIG8 is a current curve diagram of the first electronic device provided in an embodiment of the present application when in operation;

[0036] FIG9 is a schematic diagram of the internal structure of a charge-discharge chip provided in an embodiment of the present application;

[0037] FIG10 is a circuit structure diagram of a first power supply sub-circuit provided in an embodiment of the present application;

[0038] FIG11 is a circuit structure diagram of a second power supply sub-circuit provided in an embodiment of the present application;

[0039] FIG12 is an equivalent circuit diagram of a first power supply sub-circuit provided in an embodiment of the present application;

[0040] FIG13 is a circuit structure diagram of a second power supply circuit provided in an embodiment of the present application;

[0041] FIG14 is a current curve diagram of the second electronic device provided in an embodiment of the present application when in operation;

[0042] FIG15 is a circuit structure diagram of a third power supply circuit provided in an embodiment of the present application;

[0043] FIG16 is a circuit structure diagram of a fourth power supply circuit provided in an embodiment of the present application;

[0044] FIG17 is a circuit diagram of a first power supply circuit provided in an embodiment of the present application;

[0045] FIG18 is a circuit structure diagram of a fifth power supply circuit provided in an embodiment of the present application;

[0046] FIG19 is a circuit diagram of an impedance module provided in an embodiment of the present application;

[0047] FIG20 is a waveform diagram of a PWM signal provided in an embodiment of the present application;

[0048] FIG21 is a waveform diagram of an output signal of a filtering unit provided in an embodiment of the present application;

[0049] FIG22 is a circuit diagram of a second power supply circuit provided in an embodiment of the present application;

[0050] Figure 23 is a circuit diagram of the third power supply circuit provided in an embodiment of the present application.

[0051] The meanings of the reference numerals are as follows: 10, electronic device; 12, first structural member; 14, second structural member; 16, hinge;

[0052] Related technologies: 11. Power supply circuit; 11A. First power supply sub-circuit; 11B. Second power supply sub-circuit; 112. First battery; 114. Second battery; 120. Impedance module; 130. Charging and discharging chip; 140. Power consumption module;

[0053] This application: 21. Power supply circuit; 21A. First power supply sub-circuit; 21B. Second power supply sub-circuit; 212. First battery; 214. Second battery; 220. Impedance module; 222. Impedance conversion unit; 224. Controller; 226. Impedance control unit; 228. Filter unit; 230. Charging and discharging chip; 232. Voltage conversion circuit; 240. Power consumption module; 252. First electronic device; 254. Second electronic device; 256. Third electronic device. DETAILED DESCRIPTION

[0054] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0055] It should be understood that the “multiple” mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of this application, words such as “first” and “second” are used to distinguish between identical or similar items with basically the same functions and effects. Those skilled in the art can understand that words such as “first” and “second” do not limit the quantity and execution order, and words such as “first” and “second” do not necessarily limit them to be different.

[0056] Before explaining the power supply circuit provided in the embodiment of the present application in detail, the application scenarios and related technologies of the power supply circuit are first explained.

[0057] With the rapid development of electronic devices, electronic devices such as foldable screen mobile phones, tablet computers, and laptop computers may include two batteries. Taking the electronic device 10 as a foldable screen mobile phone as an example, Figure 1 is a schematic diagram of the appearance of the electronic device 10 along the first direction in the related art, and Figure 2 is a schematic diagram of the appearance of the electronic device 10 along the second direction in the related art. The first direction and the second direction are two opposite directions. As shown in Figures 1 and 2, the electronic device 10 may include a first structural member 12 and a second structural member 14. The first structural member 12 and the second structural member 14 are movably connected so that the first structural member 12 and the second structural member 14 can both rotate around the connection. In some specific embodiments, as shown in Figures 1 and 2, the first structural member 12 and the second structural member 14 are movably connected via a hinge 16.

[0058] Figure 3 is a schematic diagram of the internal structure of an electronic device 10 in the related art. For ease of description, the two batteries in the electronic device 10 are referred to as a first battery 112 and a second battery 114. As shown in Figure 3, the first battery 112 can be located in the first structural member 12, and the second battery 114 can be located in the second structural member 14. The electronic device 10 also includes a charge-discharge chip 130. The charge-discharge chip 130 can be located in either the first structural member 12 or the second structural member 14. In the embodiment shown in Figure 3, the charge-discharge chip 130 is located in the first structural member 12.

[0059] Figure 4 is a circuit structure diagram of the power supply circuit 11 of the electronic device 10 in the related art, and the power supply circuit 11 shown in Figure 4 corresponds to the internal structure of the electronic device 10 shown in Figure 3. As shown in Figure 4, the electronic device 10 also includes a power module 140 (not shown in Figure 3). The power module 140 may include N electronic devices, where N is a positive integer. The electronic device here refers to a device that requires input of electrical energy when working in the electronic device 10. For example, the electronic device may be a power management chip (power management integrated circuit, PMIC), a system-on-chip (system on chip, SOC), a mobile communication module, a wireless communication module, an audio module, a sensor module, a motor, an indicator, a camera, a display screen, etc. in the electronic device 10. Among them, the mobile communication module and the wireless communication module may include filters, switches, radio frequency power amplifiers, low noise amplifiers (low noise amplifier, LNA), etc. The audio module may include an audio power amplifier, and a speaker, a receiver, a microphone, a headphone jack, etc. connected to the audio power amplifier. The sensor module may include a pressure sensor, a gyroscope, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint recognition device, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, and the like.

[0060] The charge-discharge chip 130 has a first end and a second end. The first battery 112 and the second battery 114 are both connected to the first end of the charge-discharge chip 130. The second end of the charge-discharge chip 130 is connected to the power module 140. When the electronic device 10 is in operation, the first battery 112 and the second battery 114 can supply power to the multiple electronic devices in the power module 140 through the charge-discharge chip 130.

[0061] In related art, as shown in Figures 3 and 4, when the first battery 112 and the charge-discharge chip 130 are located in the first structural member 12, and the second battery 114 is located in the second structural member 14, the electronic device 10 further includes a flexible printed circuit (FPC) to connect the second battery 114 to the charge-discharge chip 130. The FPC extends from the first structural member 12 to the second structural member 14, bypassing the hinge 16. The charge-discharge chip 130 in the first structural member 12 and the second battery 114 in the second structural member 14 transmit electrical signals via the FPC. In this case, due to the long length and high impedance of the FPC, an impedance module 120 is also connected between the first end of the first battery 112 and the first end of the charge-discharge chip 130. The impedance of the impedance module 120 is adjustable. By adjusting the impedance of the impedance module 120, the voltage output by the first battery 112 to the first end of the charge-discharge chip 130 through the impedance module 120 can be equal to the voltage output by the second battery 114 to the first end of the charge-discharge chip 130 through the FPC, thereby allowing the first battery 112 and the second battery 114 to output electrical energy to the charge-discharge chip 130 at the same time.

[0062] However, due to the influence of the impedance module 120 and the charge-discharge chip 130, the impedance between the first battery 112 and the multiple electronic components of the power module 140 is relatively high. Similarly, due to the influence of the FPC and the charge-discharge chip 130, the impedance between the second battery 114 and the multiple electronic components of the power module 140 is also relatively high. In this case, when any electronic component in the power module 140 generates a large peak current, a large voltage drop will occur in the power supply circuit 11, which can easily trigger the undervoltage lockout (UVLO) mechanism of the electronic device 10, which is not conducive to the stable operation of the electronic device 10.

[0063] For example, the circuit that supplies power to the power-consuming module 140 via the first battery 112 through the impedance module 120 and the charge-discharge chip 130 is referred to as the first power-supply sub-circuit 11A. The circuit that supplies power to the power-consuming module 140 via the second battery 114 through the FPC and the charge-discharge chip 130 is referred to as the second power-supply sub-circuit 11B. In related art, the first power-supply sub-circuit 11A may be shown in FIG5 , and the second power-supply sub-circuit 11B may be shown in FIG6 .

[0064] In the embodiment shown in FIG5 , the electronic components in the power module 140 include the SOC and the electronic component A. Assume that when the electronic component A is operating, a large peak current is generated. In this case, when the electronic component A is operating, the voltage drop generated in the first power supply subcircuit 11A (i.e., the voltage drop from the first battery 112 to the second terminal of the charge-discharge chip 130) is:

[0065] U1=I1R. U1 is the voltage drop across the first power supply subcircuit 11A when the electronic device A is operating; I1 is the current output from the first battery 112 to the electronic device A when the electronic device A is operating; and R is the sum of the impedance of the wires in the first power supply subcircuit 11A, the impedance of the impedance module 120, and the impedance of the charge-discharge chip 130.

[0066] The input voltage of the SOC is equal to the voltage of the second terminal of the charge-discharge chip 130. The input voltage of the SOC is:

[0067] VPH=BVBAT−U1, where VPH is the input voltage of the SOC, and VBAT is the voltage of the first battery 112.

[0068] It can be seen that when the electronic device A generates a large peak current during operation, the current I1 output from the first battery 112 to the electronic device A also generates a peak value, and the voltage drop generated in the first power supply subcircuit 11A is also very large.

[0069] For example, when the electronic device 10 is operating, the voltage of the first battery 112 is a maximum of 4.45V (volts) and a minimum of 2.8V. The lower the charge of the first battery 112, the lower the voltage. The rated voltage of the SOC is generally 2.7V, and the UVLO voltage of the SOC is generally 2.35V. When the current I1 output by the first battery 112 to the electronic device A is 5A (amperes) and R is 100mΩ (milliohms), then according to the above formula, the voltage drop generated in the first power supply circuit 11A is equal to 500mV (millivolts), or 0.5V. If the charge of the first battery 112 is low at this time, and the voltage of the first battery 112 is 3V, then due to the voltage drop generated in the first power supply circuit 11A, the input voltage of the SOC is only 2.5V, which is lower than the rated voltage of the SOC and close to the UVLO voltage of the SOC, which can easily cause the SOC to lock out due to low voltage. If the current I1 generated by the electronic device A is larger, for example, I1 is 6.5A, the SOC may be directly locked, and the electronic device 10 may become abnormal and shut down.

[0070] The second power supply circuit 11B also has the same problem as the first power supply circuit 11A, so it will not be described in detail. Therefore, in the related art, when the voltage of the first battery 112 and the second battery 114 is low, the input voltage of the SOC may be lower than the rated voltage of the SOC, causing the electronic device 10 to freeze. The input voltage of the SOC may even be lower than the UVLO voltage of the SOC, causing the electronic device 10 to shut down abnormally, which is not conducive to the stable operation of the electronic device 10.

[0071] To this end, an embodiment of the present application provides a power supply circuit and an electronic device, which can avoid a large voltage drop in the power supply circuit when the electronic device generates a large peak current, thereby improving the operating stability of the electronic device.

[0072] The power supply circuit provided in the embodiments of the present application is explained in detail below. In each embodiment of the present application, the connection between any electrical modules and electronic devices refers to an electrical connection. The electrical connection here refers to a connection through a wire so that electrical signals can be transmitted between two electrical modules and / or electronic devices. The connection between two electrical modules and electronic devices can be a direct connection or an indirect connection through other electrical modules and / or electronic devices.

[0073] FIG7 is a circuit diagram of a power supply circuit 21 provided in an embodiment of the present application. As shown in FIG7 , the power supply circuit 21 includes an impedance module 220, a first battery 212, a first electronic device 252, a charge-discharge chip 230, a second battery 214, a second electronic device 254, and a power module 240.

[0074] The impedance module 220 is an electrical module with adjustable impedance. The impedance module 220 has a first end and a second end. The first end of the impedance module 220 is connected to the first battery 212, and the second end of the impedance module 220 is connected to the first end a of the charge-discharge chip 230. In this way, by adjusting the impedance of the impedance module 220, the voltage output by the first battery 212 to the first end a of the charge-discharge chip 230 through the impedance module 220 can be adjusted. In some specific embodiments, the impedance module 220 may include a transistor, and the impedance of the impedance module 220 can be adjusted by adjusting the conduction degree of the transistor. In other specific embodiments, the impedance module 220 may also include an adjustable resistor, and the impedance of the impedance module 220 can be adjusted by adjusting the resistance value of the adjustable resistor.

[0075] The power module 240 may include one or more electronic components. The first electronic component 252 and the second electronic component 254 are independent electronic components outside of the power module 240. As previously mentioned, an electronic component refers to a component in an electronic device that requires electrical energy to operate. In other words, when the electronic device is operating, the first battery 212 and / or the second battery 214 must supply power to the first electronic component 252, the second electronic component 254, and the electronic components in the power module 240. This description will not be repeated here.

[0076] The first electronic device 252 and the second electronic device 254 are both electronic devices that generate a large peak current when working. Here, a first threshold value can be defined, and the first threshold value is a current threshold value used to determine whether the peak current generated by the electronic device when working is large. When the peak current of the electronic device is greater than or equal to the first threshold value, it is determined that the electronic device will generate a large peak current when working. The first threshold value can be set by those skilled in the art based on needs and experience. For example, in some specific embodiments, the first threshold value can be 2.5A, 3A or 3.5A, for example. That is, the peak current generated by the first electronic device 252 when working is greater than or equal to the first threshold value, and the peak current generated by the second electronic device 254 when working is also greater than or equal to the first threshold value. In a preferred embodiment, the first threshold value is 3A.

[0077] Peak current refers to the difference between the maximum current value and the average current value generated when the electronic device is working. For example, Figure 8 is a current curve diagram of an electronic device provided in an embodiment of the present application when it is working, wherein the ordinate I represents the current and the abscissa T represents the time. As shown in Figure 8, straight line ① represents the average current value when the electronic device is working, that is, the average current value when the electronic device is working is I1; curve ② is the current curve when the electronic device is working. It can be seen that the maximum current value generated when the electronic device is working is I2. Based on this, the peak current generated when the electronic device is working is equal to the difference between I2 and I1, that is, △I. When △I is greater than or equal to the first threshold value, it indicates that the electronic device will generate a larger peak current when it is working.

[0078] The charge and discharge chip 230 has a first end a and a second end b. As mentioned above, the first end a of the charge and discharge chip 230 is connected to the first battery 212 through the impedance module 220. Here, the first end a of the charge and discharge chip 230 is also connected to the second battery 214. The second end b of the charge and discharge chip 230 is used to connect to the power module 240. Figure 9 is a schematic diagram of the internal structure of a charge and discharge chip 230 provided in an embodiment of the present application. As shown in Figure 9, the charge and discharge chip 230 also has a third end c, and the third end c of the charge and discharge chip 230 is used to connect to the charger. Generally, a voltage conversion circuit 232 can be connected between the first end a and the third end c of the charge and discharge chip 230. The voltage conversion circuit 232 is a DC BOOST (boost conversion) circuit or / and a DC BUCK (buck conversion) circuit for achieving DC voltage boost or buck. A transistor M0 can be connected between the first end a and the second end b of the charge and discharge chip 230. When transistor M0 is on and the third terminal c of the charge-discharge chip 230 is connected to a charger, a path is formed in the charge-discharge chip 230, starting from the third terminal c of the charge-discharge chip 230, passing through the voltage conversion circuit 232 and transistor M0, and reaching the second terminal b of the charge-discharge chip 230. This path can supply power to the electronic components in the power-consuming module 240. Simultaneously, a path is also formed in the charge-discharge chip 230, starting from the third terminal c of the charge-discharge chip 230, passing through the voltage conversion circuit 232, and reaching the first terminal a of the charge-discharge chip 230. This path can charge the first battery 212 and the second battery 214. When transistor M0 is on and the third terminal c of the charge-discharge chip 230 is not connected to a charger, a path is formed in the charge-discharge chip 230, starting from the first terminal a of the charge-discharge chip 230, passing through transistor M0, and reaching the second terminal b of the charge-discharge chip 230. In this case, the first battery 212 and the second battery 214 can supply power to the electronic components in the power-consuming module 240 through the path formed in the charge-discharge chip 230.

[0079] In the embodiment of the present application, the connection method between the first electronic device 252, the second electronic device 254 and the battery (including the first battery 212 and the second battery 214) is different from the connection method between the electronic devices and the battery in the power module 240. Specifically, as shown in Figure 7, the first electronic device 252 is directly connected to the first battery 212. In other words, the first end of the first electronic device 252, the first battery 212 and the impedance module 220 are connected to the same node, so that the first battery 212 alone supplies power to the first electronic device 252. Similarly, the second electronic device 254 is directly connected to the second battery 214, so that the second battery 214 alone supplies power to the second electronic device 254.

[0080] In the power supply circuit 21, the first electronic device 252 and the second electronic device 254 are electronic devices that generate a large peak current when working. The first electronic device 252 is independent of the power module 240 and is directly connected to the first battery 212, without being connected to the first battery 212 through the charge and discharge chip 230 and the impedance module 220. This can reduce the impedance between the first electronic device 252 and the first battery 212, thereby reducing the voltage drop formed when the first electronic device 252 generates a peak current when working. Similarly, the second electronic device 254 is independent of the power module 240 and is directly connected to the second battery 214, which can also reduce the voltage drop formed when the second electronic device 254 generates a peak current when working. By reducing the voltage drop formed when the electronic device generates a peak current when working, the UVLO of the electronic device can be avoided, thereby improving the working stability of the electronic device.

[0081] For example, the power supply circuit 21 shown in Figure 7 can be divided into a first power supply circuit 21A and a second power supply circuit 21B. Figure 10 is a circuit structure diagram of a first power supply circuit 21A provided in an embodiment of the present application. As shown in Figure 10, the first power supply circuit 21A refers to the part of the power supply circuit 21 where the first battery 212 supplies power to the power-consuming module 240 through the impedance module 220 and the charge-discharge chip 230, and the part where the first battery 212 supplies power to the first electronic device 252. Figure 11 is a circuit structure diagram of a second power supply circuit 21B provided in an embodiment of the present application. As shown in Figure 11, the second power supply circuit 21B refers to the part of the power supply circuit 21 where the second battery 214 supplies power to the power-consuming module 240 through the charge-discharge chip 230, and the part where the second battery 214 supplies power to the second electronic device 254.

[0082] In the embodiment shown in FIG10 , the power module 240 includes a SOC, a display screen, and other electronic components. The node connected to the first electronic device 252, the first battery 212, and the first end of the impedance module 220 is referred to as node F. An equivalent circuit diagram of the first power supply subcircuit 21A shown in FIG10 may be shown in FIG12 , wherein resistor R12 is the equivalent resistance of the wire connected from the first battery 212 to node F; resistor R11 is the equivalent resistance from node F to the second end b of the charge-discharge chip 230, and its magnitude is equal to the sum of the impedance of the wire from node F to the second end b of the charge-discharge chip 230, the impedance of the impedance module 220, and the impedance of the charge-discharge chip 230.

[0083] The input voltage of the SOC is equal to the voltage of the second terminal b of the charge-discharge chip 230. In this case, the input voltage of the SOC is:

[0084] Wherein, VPH is the input voltage of SOC, VBAT is the voltage of the first battery 212, I1 is the total current output by the first battery 212, R 12 is the impedance of resistor R12, I 11 is the current output from the first battery 212 to the power module 240, R 11 is the impedance of resistor R11, I 12 It is the current output from the first battery 212 to the first electronic device 252 .

[0085] It can be seen that when the first electronic device 252 generates a large peak current, that is, the current I output by the first battery 212 to the first electronic device 252 is 12 When a peak value is generated, the total current I1 output by the first battery 212 generates a peak value, but does not affect the current I output by the first battery 212 to the power module 240. 11 Since the resistor R12 is only the equivalent resistance of the wire, that is, the impedance of the resistor R12 is R 12 Therefore, the peak value of the total current I1 output by the first battery 212 has little effect on the input voltage VPH of the SOC.

[0086] For example, when the electronic device to which the power supply circuit 21 is applied is working, the maximum voltage of the first battery 212 is 4.45V and the minimum voltage is 2.8V. The lower the power of the first battery 212, the lower the voltage. The rated voltage of the SOC is generally 2.7V, and the UVLO voltage of the SOC is generally 2.35V. When the current I output by the first battery 212 to the first electronic device 252 is 12 is 5A, the current I output by the first battery 212 to the power module 240 11 The impedance of resistor R12 is R 12 The impedance of resistor R11 is 1mΩ. 11 is 100mΩ. If the voltage of the first battery 212 is 3V at this time, then according to the above formula, the input voltage of the SOC is 2.793V, which is higher than the rated voltage of the SOC and much higher than the UVLO voltage of the SOC. In this way, while meeting the power supply demand of the first electronic device 252, it is possible to avoid triggering the low voltage lock mechanism of the electronic device, thereby improving the working stability of the electronic device. In other words, since the current I output by the first battery 212 to the first electronic device 252 is 12 The current does not need to flow through the impedance module 220 and the charge-discharge chip 230, which can avoid a large voltage drop in the power supply circuit 21, thereby improving the working stability of the electronic device. The second power supply circuit 21B can also produce the same effect, which will not be repeated here.

[0087] The power supply circuit 21 provided in the embodiment of the present application also has the following beneficial effects: the first battery 212 and the second battery 214 jointly supply power to the power module 240 through the charge-discharge chip 230. Compared with the case where only one of the first battery 212 and the second battery 214 supplies power to the power module 240, the operating time of the power module 240 can be increased, thereby ensuring the endurance of the electronic device used by the power supply circuit 21. The lower the battery power, the lower the voltage. Therefore, the first battery 212 and the second battery 214 are both directly connected to the electronic device. Compared with the case where only one of the first battery 212 and the second battery 214 is connected to the electronic device, it is more conducive to keeping the voltage difference between the two batteries small, thereby improving the operating stability of the electronic device.

[0088] In some embodiments, as mentioned above, when the power supply circuit 21 is applied to electronic devices such as foldable screen mobile phones, the electronic device also includes an FPC. In this case, the circuit structure of the power supply circuit 21 can be as shown in Figure 13. Specifically, in the second power supply circuit 21B, the second battery 214, the second electronic device 254 and the first end of the FPC are connected together, and the second end of the FPC is used to connect to the first end a of the charge and discharge chip 230. In this way, the current output from the second battery 214 to the second electronic device 254 does not need to flow through the FPC with a large impedance, thereby avoiding a large voltage drop in the power supply circuit 21 and improving the working stability of the electronic device.

[0089] The following is a detailed explanation of the differences between the first electronic device 252 and the second electronic device 254 and the electronic devices in the power module 240 .

[0090] Both the first electronic device 252 and the second electronic device 254 can be electronic devices with a relatively large peak current and a relatively small average current. The peak current refers to the difference between the maximum current value and the average current value generated by the electronic device during operation. A relatively large peak current means that the peak current of the electronic device is greater than or equal to a first threshold value, which will not be further described.

[0091] The mean current refers to the average current value generated by an electronic device during operation. A second threshold value may also be defined. This second threshold value is used to determine whether the mean current generated by the electronic device during operation is relatively low. When the mean current of the electronic device is less than or equal to the second threshold value, it is determined that the electronic device generates a relatively low mean current during operation. The second threshold value can be set by those skilled in the art based on needs and experience. For example, the second threshold value may be 0.8A, 1A, or 1.2A. That is, the average current value generated by the first electronic device 252 during operation is less than or equal to the second threshold value, and the average current value generated by the second electronic device 254 during operation is also less than or equal to the second threshold value. In a preferred embodiment, the second threshold value is 1A. In some embodiments, a current curve graph of an electronic device with a relatively high peak current and a relatively low mean current during operation may be shown in FIG8 . In some specific embodiments, the first electronic device 252 and the second electronic device 254 may be a radio frequency power amplifier in a communication module (including a mobile communication module and a wireless communication module), an LNA in a communication module, or an audio power amplifier in an audio module.

[0092] Any one of the multiple electronic devices in the power-consuming module 240 is an electronic device with a relatively small peak current and a relatively large average current.

[0093] Here, a third threshold value can be defined. The third threshold value is a current threshold value used to determine whether the peak current generated by the electronic device when it is working is small. When the peak current of the electronic device is less than the third threshold value, it is determined that the electronic device will generate a smaller peak current when it is working. The third threshold value is less than or equal to the first threshold value, and the third threshold value can be set by those skilled in the art according to needs and experience. For example, in some specific embodiments, when the first threshold value is 3A, the third threshold value can be 0.5A, 1A, 2A or 3A. In a preferred embodiment, the third threshold value is 0.5A. That is to say, among the multiple electronic devices of the power module 240, the peak current of any electronic device is less than the third threshold value. In this case, there are:

[0094] The peak current of any electronic device in the power module 240 is less than the third threshold ≤ the first threshold ≤ the peak current of the first electronic device 252; and the peak current of any electronic device in the power module 240 is less than the third threshold ≤ the first threshold ≤ the peak current of the second electronic device 254.

[0095] Therefore, the peak current of any electronic component in the power module 240 must be less than the first threshold. The peak currents of the first electronic component 252 and the second electronic component 254 are larger relative to any electronic component in the power module 240.

[0096] Here, a fourth threshold value can be defined. The fourth threshold value is a current threshold value used to determine whether the average current generated by the electronic device when it is working is large. When the average current of the electronic device is greater than the fourth threshold value, it is determined that the electronic device will generate a large average current when it is working. The fourth threshold value is greater than or equal to the second threshold value, and the fourth threshold value can be set by those skilled in the art based on needs and experience. For example, in some specific embodiments, when the second threshold value is 1A, the fourth threshold value can be, for example, 1A, 2A or 3A. In a preferred embodiment, the fourth threshold value is 3A. That is to say, among the multiple electronic devices of the power module 240, the average current of any electronic device is greater than the fourth threshold value. In this case, there are:

[0097] The average current of the first electronic device 252 ≤ the second threshold ≤ the fourth threshold < the average current of any electronic device in the power module 240 ; and the average current of the second electronic device 254 ≤ the second threshold ≤ the fourth threshold < the average current of any electronic device in the power module 240 .

[0098] Therefore, the average current of any electronic device in the power module 240 must be greater than the second threshold. The smaller average currents of the first electronic device 252 and the second electronic device 254 are relative to any electronic device in the power module 240.

[0099] In some embodiments, a current curve graph for an electronic device with a low peak current and a high average current during operation can be shown in Figure 14 , where line ③ represents the average current value of the electronic device during operation, that is, the average current value of the electronic device during operation is I3; curve ④ is the current curve for the electronic device during operation. As can be seen, the maximum current value generated by the electronic device during operation is I4, and the difference between I4 and I3 is less than the third threshold. In some specific embodiments, the electronic components in the power module 240 include a PMIC, a display, a SOC, etc.

[0100] In this embodiment, when the multiple electronic devices in the power module 240 are all electronic devices with small peak current and large average current, the power supply circuit 21 also has the following beneficial effects: on the one hand, based on the fact that the multiple electronic devices in the power module 240 have small peak current, the low voltage locking mechanism of the electronic device can be avoided from being triggered by the peak current generated by the electronic devices, thereby improving the working stability of the electronic device; on the other hand, based on the fact that the multiple electronic devices in the power module 240 have large average current, the first battery 212 and the second battery 214 jointly supply power to these electronic devices through the charging and discharging chip 230, which can increase the working time of these electronic devices, thereby ensuring the battery life of the electronic device used by the power supply circuit 21.

[0101] The power supply circuit 21 provided in the embodiment of the present application is further expanded below.

[0102] In some embodiments, due to the form factor of the foldable phone, the volume of the first battery 212 and the volume of the second battery 214 may differ. In this case, the rated capacity of the first battery 212 and the rated capacity of the second battery 214 may also differ. Based on this, the connection method of each electronic device with a large peak current and a small average current can be set according to the rated capacity of the first battery 212 and the rated capacity of the second battery 214. The following describes this in detail based on two possible scenarios.

[0103] 1. In a first possible scenario, the first battery 212 and the second battery 214 are each directly connected to an electronic device with a large peak current and a small average current.

[0104] Specifically, when the first battery 212 and the second battery 214 are each connected to an electronic device with a larger peak current and a smaller average current, in order to minimize the voltage difference between the two batteries, the electronic device 252 or the second electronic device 254 that consumes more power can be connected to the one with the larger rated capacity of the first battery 212 or the second battery 214, while the electronic device 252 or the second electronic device 254 that consumes less power can be connected to the one with the smaller rated capacity of the first battery 212 or the second battery 214. For example, as shown in FIG. 7 or FIG. 13 , the first battery 212 is directly connected to the first electronic device 252, and the second battery 214 is directly connected to the second electronic device 254. In this case, if the rated capacity of the first battery 212 is greater than the rated capacity of the second battery 214, the first electronic device 252 can be the electronic device that consumes more power of the two electronic devices (i.e., the first electronic device 252 and the second electronic device 254), while the second electronic device 254 is the electronic device that consumes less power of the two electronic devices.

[0105] In some specific embodiments, the amount of power consumed by an electronic device can be determined based on the power consumption of the electronic device within a preset time period when the user normally uses the electronic device. The preset time period here can be set by those skilled in the art based on experience or needs. For example, the preset time period can be 1 day, 3 days, or 7 days. If the power consumption of the first electronic device 252 within the preset time period is greater than the power consumption of the second electronic device 254 within the preset time period, it is determined that the first electronic device 252 is the electronic device that consumes more power of the two electronic devices, and the second electronic device 254 is the electronic device that consumes less power of the two electronic devices.

[0106] In other specific embodiments, the amount of power consumed by an electronic device can be determined based on the average current of the electronic device. For example, in one possible embodiment, if the average current of the first electronic device 252 is greater than the average current of the second electronic device 254, then the first electronic device 252 is determined to be the electronic device that consumes more power of the two electronic devices, and the second electronic device 254 is determined to be the electronic device that consumes less power of the two electronic devices. In other words, if the average currents are unequal, the amount of power consumed by the electronic device during operation can be determined based on the magnitude of the average current generated by the electronic device during operation.

[0107] Second, in a second possible scenario, at least one of the first battery 212 and the second battery 214 may be directly connected to multiple electronic devices with large peak currents and small average currents, where the term "multiple" refers to two or more integers.

[0108] Specifically, when at least one of the first battery 212 and the second battery 214 is directly connected to multiple electronic devices, in order to minimize the voltage difference between the two batteries, the electronic devices connected to the battery with the larger rated capacity can be made to consume more power, while the electronic devices connected to the battery with the smaller rated capacity can be made to consume less power. For example, as shown in FIG15 , the first battery 212 is directly connected to the first electronic device 252 and the third electronic device 256, and the second battery 214 is directly connected to the second electronic device 254. In this case, if the rated capacity of the first battery 212 is greater than the rated capacity of the second battery 214, the sum of the power consumption of the first electronic device 252 and the power consumption of the third electronic device 256 can be greater than the power consumption of the second electronic device 254.

[0109] In some specific embodiments, the power consumption of an electronic device can be determined based on the power consumption of the electronic device over a preset time period when the user normally uses the electronic device. If the sum of the power consumption of the first electronic device 252 over the preset time period plus the power consumption of the third electronic device 256 over the preset time period is greater than the power consumption of the second electronic device 254 over the preset time period, then it is determined that the sum of the power consumption of the first electronic device 252 and the power consumption of the third electronic device 256 is greater than the power consumption of the second electronic device 254.

[0110] In other specific embodiments, the amount of power consumed by the electronic device can be determined based on the average current of the electronic device. For example, in one possible embodiment, if the sum of the average current of the first electronic device 252 and the average current of the third electronic device 256 is greater than the average current of the second electronic device 254, then it is determined that the sum of the power consumed by the first electronic device 252 and the power consumed by the third electronic device 256 is greater than the power consumed by the second electronic device 254.

[0111] It will be appreciated that in the embodiment shown in FIG15 , the power supply circuit 21 provided in the embodiment of the present application is described using only an example in which the first battery 212 is directly connected to multiple electronic devices and the second battery 214 is directly connected to one electronic device. In other embodiments, the first battery 212 may be directly connected to one electronic device and the second battery 214 may be directly connected to multiple electronic devices, and the electronic device connected to the battery with a larger rated capacity consumes more power, while the electronic device connected to the battery with a smaller rated capacity consumes less power. In still other embodiments, both the first battery 212 and the second battery 214 may be directly connected to multiple electronic devices, which will not be described in detail.

[0112] Two specific implementations of the impedance module 220 are explained in detail below.

[0113] 1. In a first possible implementation, the impedance module 220 includes an impedance transformation unit 222 and a controller 224 .

[0114] Figure 16 is a circuit structure diagram of another power supply circuit 21 provided in an embodiment of the present application. As shown in Figure 16, the impedance module 220 may include an impedance conversion unit 222 and a controller 224. The impedance conversion unit 222 has a first end and a second end. The first end of the impedance conversion unit 222 is connected to the first battery 212 and the first electronic device 252, and the second end of the impedance conversion unit 222 is connected to the first end a of the charge and discharge chip 230, the second battery 214 and the second electronic device 254. The control end of the impedance conversion unit 222 is connected to the controller 224 so that the controller 224 can adjust the impedance of the impedance conversion unit 222, that is, adjust the impedance between the first battery 212 and the first end a of the charge and discharge chip 230.

[0115] Figure 17 is a circuit diagram of a power supply circuit 21 provided in an embodiment of the present application. As shown in Figure 17, the impedance conversion unit 222 may include a first transistor M1 and a second transistor M2. Among them, the first end of the first transistor M1 is connected to the first battery 212 and the first electronic device 252. The second end of the first transistor M1 is connected to the first end of the second transistor M2, and the second end of the second transistor M2 is connected to the first end a of the charge and discharge chip 230, the second battery 214 and the second electronic device 254. In the embodiment shown in Figure 17, the first transistor M1 and the second transistor M2 are P-type transistors, such as P-type metal oxide semiconductor field effect transistors (MOSFET). In some other embodiments not shown, the first transistor M1 and the second transistor M2 may also be N-type transistors.

[0116] In this embodiment, the controller 224 is connected to the control terminal of the first transistor M1 and the control terminal of the second transistor M2. The controller 224 can control the voltage of the control terminal of the first transistor M1 and the control terminal of the second transistor M2 by outputting an analog signal, thereby controlling the degree of conduction of the first transistor M1 and the second transistor M2, that is, controlling the impedance of the impedance conversion unit 222 formed by the first transistor M1 and the second transistor M2. For example, when the first transistor M1 and the second transistor M2 are both P-type transistors, the controller 224 can increase the impedance of the impedance conversion unit 222 by increasing the voltage of the control terminal of the first transistor M1 and the control terminal of the second transistor M2; or it can reduce the impedance of the impedance conversion unit 222 by reducing the voltage of the control terminal of the first transistor M1 and the control terminal of the second transistor M2.

[0117] 2. In a second possible implementation, the impedance module 220 includes an impedance transformation unit 222 , an impedance control unit 226 , a filtering unit 228 and a controller 224 .

[0118] Figure 18 is a circuit structure diagram of another power supply circuit 21 provided in an embodiment of the present application. As shown in Figure 18, the impedance module 220 may include an impedance conversion unit 222, an impedance control unit 226, a filter unit 228, and a controller 224. The filter unit 228 has an input end and an output end. The input end of the filter unit 228 is connected to the controller 224. The output end of the filter unit 228 is connected to the input end of the impedance control unit 226. The output end of the impedance control unit 226 is connected to the control end of the impedance conversion unit 222. The impedance conversion unit 222 also has a first end and a second end. The first end of the impedance conversion unit 222 is connected to the first battery 212 and the first electronic device 252, and the second end of the impedance conversion unit 222 is connected to the first end a of the charge and discharge chip 230, the second battery 214, and the second electronic device 254. In this way, by adjusting the impedance of the impedance conversion unit 222, the impedance between the first battery 212 and the first end a of the charge and discharge chip 230 can be adjusted.

[0119] Specifically, Figure 19 is a circuit diagram of an impedance module 220 provided in an embodiment of the present application. As shown in Figure 19, the impedance conversion unit 222 includes a first transistor M1 and a second transistor M2; the impedance control unit 226 includes a first resistor R1, a third transistor M3, a first capacitor C1, and a third resistor R3; and the filtering unit 228 includes a second resistor R2 and a second capacitor C2.

[0120] The first end of the first transistor M1 is connected to the first battery 212 and the first electronic device 252. The second end of the first transistor M1 is connected to the first end of the second transistor M2. The second end of the second transistor M2 is connected to the first end a of the charge-discharge chip 230, the second battery 214, and the second electronic device 254.

[0121] The first end of the first resistor R1 is connected to the second end of the first transistor M1 and the first end of the second transistor M2. The second end of the first resistor R1 is connected to the first end of the third transistor M3. The second end of the third transistor M3 is connected to the ground line GND. The first capacitor C1 is a parasitic capacitance of the third transistor M3. The first plate of the first capacitor C1 is connected to the first end of the third transistor M3, and the second plate of the first capacitor C1 is connected to the second end of the third transistor M3. The first end of the third resistor R3 is connected to the control end of the third transistor M3, and the second end of the third resistor R3 is connected to the second end of the third transistor M3. In an embodiment of the present application, the third transistor M3 can be an N-type transistor, such as an N-type MOSFET. The third resistor R3 is a pull-down resistor for the third transistor M3.

[0122] The first end of the second resistor R2 is connected to the controller 224, and the second end of the second resistor R2 is connected to the control terminal of the third transistor M3. The first plate of the second capacitor C2 is connected to the control terminal of the third transistor M3, and the second plate of the second capacitor C2 is connected to the second terminal of the third transistor M3. In other words, the filtering unit 228 is an RC filtering circuit formed by the second resistor R2 and the second capacitor C2.

[0123] When the power supply circuit 21 is operating, the controller 224 can output a pulse width modulation (PWM) signal to the filtering unit 228. A PWM signal is a square wave signal consisting of a high-level signal and a low-level signal. Its waveform can be shown in Figure 20, where the vertical axis U represents voltage and the horizontal axis T represents time. After receiving the PWM signal, the filtering unit 228 can filter the PWM signal and output a signal to the control terminal of the third transistor M3. The waveform of the output signal of the filtering unit 228 is shown in Figure 21. In this embodiment, the voltage of the output signal of the filtering unit 228 can be adjusted by adjusting the duty cycle of the PWM signal. The duty cycle of a PWM signal refers to the percentage of the duration of the high-level signal within a cycle of the PWM signal to the total duration of the cycle. A cycle of a PWM signal consists of adjacent high-level and low-level signals. For example, in the embodiment shown in Figure 20, a cycle of the PWM signal is from time t1 to time t2. The duty cycle of the PWM signal is the percentage of the duration from time t01 to time t2 relative to the duration from time t1 to time t2. The greater the duty cycle of the PWM signal, the higher the voltage of the output signal of the filter unit 228. Conversely, the smaller the duty cycle of the PWM signal, the lower the voltage of the output signal of the filter unit 228.

[0124] When the controller 224 outputs a PWM signal, the frequency of the PWM signal is the same as the operating frequency of the filter unit 228. Here, the operating frequency of the filter unit 228 is: Wherein, R is the resistance of the second resistor R2, and C is the capacitance of the second capacitor C2. The frequency of the PWM signal refers to the number of cycles of the PWM signal within 1 second.

[0125] The first resistor R1 and the third transistor M3 are connected in series to form a voltage divider circuit. Since the third transistor M3 is an N-type transistor, the higher the voltage of the output signal of the filter unit 228, that is, the higher the voltage of the control terminal of the third transistor M3, the greater the conduction degree of the third transistor M3, that is, the lower the impedance of the third transistor M3. The lower the impedance of the third transistor M3, the lower the voltage of the node connected to the first terminal of the third transistor M3 and the second terminal of the first resistor R1, that is, the lower the voltage of the control terminal of the first transistor M1 and the second transistor M2. Since the first transistor M1 and the second transistor M2 are P-type transistors, the lower the voltage of the control terminal of the first transistor M1 and the second transistor M2, the greater the conduction degree of the first transistor M1 and the second transistor M2, and the lower the impedance of the first transistor M1 and the second transistor M2.

[0126] Similarly, the lower the voltage of the output signal of the filtering unit 228, that is, the lower the voltage of the control terminal of the third transistor M3, the lower the conduction degree of the third transistor M3, that is, the greater the impedance of the third transistor M3. The greater the impedance of the third transistor M3, the higher the voltage of the node connected to the first terminal of the third transistor M3 and the second terminal of the first resistor R1, that is, the higher the voltage of the control terminals of the first transistor M1 and the second transistor M2. Since the first transistor M1 and the second transistor M2 are P-type transistors, the higher the voltage of the control terminals of the first transistor M1 and the second transistor M2, the lower the conduction degree of the first transistor M1 and the second transistor M2, and the greater the impedance of the first transistor M1 and the second transistor M2.

[0127] Therefore, the PWM signal output by the controller 224 can control the impedance of the impedance conversion unit 222 formed by the first transistor M1 and the second transistor M2. The greater the duty cycle of the PWM signal, the smaller the impedance of the impedance conversion unit 222 formed by the first transistor M1 and the second transistor M2, that is, the smaller the impedance between the first battery 212 and the first terminal a of the charge-discharge chip 230. The smaller the duty cycle of the PWM signal, the greater the impedance of the impedance conversion unit 222 formed by the first transistor M1 and the second transistor M2, that is, the greater the impedance between the first battery 212 and the first terminal a of the charge-discharge chip 230. During this process, the frequency of the PWM signal remains unchanged.

[0128] It can be understood that when the first battery 212 outputs electric energy to the first terminal a of the charge-discharge chip 230 through the impedance module 220, under the condition that the voltage of the first battery 212 remains unchanged, the greater the impedance of the impedance module 220, the smaller the voltage output by the first battery 212 to the first terminal a of the charge-discharge chip 230 through the impedance module 220; the smaller the impedance of the impedance module 220, the greater the voltage output by the first battery 212 to the first terminal a of the charge-discharge chip 230 through the impedance module 220.

[0129] Figures 22 and 23 are two different circuit diagrams of power supply circuits provided in embodiments of the present application. As shown in Figure 22, in some specific embodiments, when the electronic device used in the power supply circuit 21 includes multiple audio power amplifiers, the first electronic device 252 can be an audio power amplifier, and the second electronic device 254 can be another audio power amplifier. In this case, the RF power amplifier and LNA can be placed in the power module 240, which can also include a PMIC, a SOC, a display, etc. As shown in Figure 23, in other specific embodiments, when the electronic device used in the power supply circuit 21 includes only one audio power amplifier, the first electronic device 252 can be an audio power amplifier, and the second electronic device 254 can be an RF power amplifier. In this case, the power module 240 can include a PMIC, a SOC, a display, etc. It will be understood that in the embodiments shown in Figures 22 and 23, the multiple electronic devices in the power module 240 can be connected in series or in parallel. Taking the PMIC and SOC in the power module 240 as an example, the PMIC and SOC are connected in parallel, which means that the PMIC and SOC are respectively connected to the second end b of the charge and discharge chip 230; the PMIC and SOC are connected in series, which means that the input end of the PMIC is connected to the second end b of the charge and discharge chip 230, and the output end of the PMIC is connected to the SOC.

[0130] An embodiment of the present application also provides an electronic device 10, comprising a power supply circuit 21 as in any of the above embodiments. In some embodiments, the electronic device 10 may be a foldable screen mobile phone. The appearance of the electronic device 10 may be as shown in Figures 1 and 2. That is, the electronic device 10 may include a first structural member 12 and a second structural member 14. The first structural member 12 and the second structural member 14 are movably connected, for example, the first structural member 12 and the second structural member 14 may be connected by a hinge 16. The impedance module 220, the first battery 212 and the first electronic device 252 are located in the first structural member 12. The second battery 214 and the second electronic device 254 are located in the second structural member 14. The charge and discharge chip 230 is located in any one of the first structural member 12 and the second structural member 14.

[0131] In some embodiments, the charge-discharge chip 230 is located in the first structural component 12 ; the second battery 214 is connected to the first end a of the charge-discharge chip 230 via an FPC.

[0132] The power supply circuit 21 provided in the embodiment of the present application has at least the following beneficial effects:

[0133] The first battery 212 and the second battery 214 jointly supply power to the power module 240 through the charge-discharge chip 230. Compared to the case where only one of the first battery 212 and the second battery 214 supplies power to the power module 240 through the charge-discharge chip 230, this can increase the operating time of the power module 240, thereby ensuring the endurance of the electronic device 10 used by the power supply circuit 21. The first electronic device 252 and the second electronic device 254 are electronic devices that generate a large peak current when operating. The first electronic device 252 is independent of the power module 240 and is directly connected to the first battery 212, rather than being connected to the first battery 212 through the charge-discharge chip 230 and the impedance module 220. This can reduce the impedance between the first electronic device 252 and the first battery 212, thereby reducing the voltage drop formed when the first electronic device 252 generates a peak current. Similarly, the second electronic device 254 is independent of the power module 240 and is directly connected to the second battery 214, which can also reduce the voltage drop formed when the second electronic device 254 generates a peak current when operating. By reducing the voltage drop generated when the electronic device generates peak current, the triggering of the low-voltage lockout mechanism of the electronic device 10 can be avoided, thereby improving the operating stability of the electronic device 10. Furthermore, since both the first battery 212 and the second battery 214 are directly connected to the electronic device, compared to only one of the first battery 212 and the second battery 214 being connected to the electronic device, the voltage difference between the two batteries is more likely to be kept small, thereby improving the operating stability of the electronic device 10.

[0134] When the rated capacity of the first battery 212 is different from the rated capacity of the second battery 214, the electronic device connected to the battery with a larger rated capacity consumes more power, and the electronic device connected to the battery with a smaller rated capacity consumes less power. The voltage difference between the two batteries can be kept as small as possible, thereby improving the working stability of the electronic device 10.

[0135] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A power supply circuit, characterized in that: The power supply circuit includes an impedance module, a first battery, a first electronic device, a charge and discharge chip, a second battery, a second electronic device and a power module; The first end of the impedance module is connected to the first battery and the first electronic device, the second end of the impedance module is connected to the first end of the charge-discharge chip, the second battery and the second electronic device, and the second end of the charge-discharge chip is connected to the power module, so that the first battery alone supplies power to the first electronic device, the second battery alone supplies power to the second electronic device, and the first battery and the second battery supply power to the power module through the charge-discharge chip; The difference between the maximum current value and the average current value of the first electronic device is greater than or equal to a first threshold, and the difference between the maximum current value and the average current value of the second electronic device is greater than or equal to the first threshold.

2. The power supply circuit according to claim 1, characterized in that: An average current value of the first electronic device is less than or equal to a second threshold, and an average current value of the second electronic device is less than or equal to a second threshold.

3. The power supply circuit according to claim 2, characterized in that: The power consumption module includes a plurality of electronic devices, and a difference between a maximum current value and an average current value of any one of the plurality of electronic devices is less than a third threshold, and the third threshold is less than or equal to the first threshold.

4. The power supply circuit according to claim 3, characterized in that: The average current value of any one of the electronic components is greater than a fourth threshold, and the fourth threshold is greater than or equal to the second threshold.

5. The power supply circuit according to claim 1, characterized in that: The rated capacity of the first battery is greater than the rated capacity of the second battery, and the power consumption of the first electronic device within a preset time period is greater than the power consumption of the second electronic device within the preset time period.

6. The power supply circuit according to claim 1, characterized in that: The rated capacity of the first battery is greater than the rated capacity of the second battery, and the average current value of the first electronic device is greater than the average current value of the second electronic device.

7. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes: a third electronic device, which is connected to the first battery; the rated capacity of the first battery is greater than the rated capacity of the second battery, and the sum of the power consumption of the first electronic device within a preset time period and the power consumption of the third electronic device within the preset time period is greater than the power consumption of the second electronic device within the preset time period.

8. The power supply circuit according to any one of claims 1 to 7, characterized in that: The first electronic device is an audio power amplifier or a radio frequency power amplifier, and the second electronic device is an audio power amplifier or a radio frequency power amplifier.

9. The power supply circuit according to any one of claims 1 to 7, characterized in that: The impedance module includes a first transistor, a second transistor and a controller; The first end of the first transistor is connected to the first battery and the first electronic device, the second end of the first transistor is connected to the first end of the second transistor, and the second end of the second transistor is connected to the first end of the charging and discharging chip, the second battery and the second electronic device; The controller is connected to the control end of the first transistor and the control end of the second transistor, and is used to control the voltage of the control end of the first transistor and the control end of the second transistor so that the voltage output by the first battery to the first end of the charge and discharge chip through the impedance module is equal to the voltage output by the second battery to the first end of the charge and discharge chip.

10. The power supply circuit according to claim 9, characterized in that: The impedance module further includes: a first resistor, a third transistor, a first capacitor, a second resistor, a second capacitor and a third resistor; The first end of the first resistor is connected to the second end of the first transistor and the first end of the second transistor, the second end of the first resistor is connected to the first end of the third transistor, the control end of the first transistor and the control end of the second transistor, and the second end of the third transistor is connected to the ground line; The first plate of the first capacitor is connected to the first end of the third transistor, and the second plate of the first capacitor is connected to the second end of the third transistor; A first end of the second resistor is connected to the controller, and a second end of the second resistor is connected to the control end of the third transistor; The first plate of the second capacitor is connected to the control terminal of the third transistor, and the second plate of the second capacitor is connected to the second terminal of the third transistor; A first end of the third resistor is connected to the control end of the third transistor, and a second end of the third resistor is connected to the second end of the third transistor.

11. An electronic device, characterized in that: The invention comprises a power supply circuit as claimed in any one of claims 1 to 10.

12. The electronic device according to claim 11, characterized in that: The electronic device comprises a first structural member and a second structural member; The first structural member and the second structural member are movably connected, the impedance module, the first battery and the first electronic device are located in the first structural member, and the second battery and the second electronic device are located in the second structural member; The charging and discharging chip is located in any one of the first structural component and the second structural component.

13. The electronic device according to claim 12, characterized in that: The charging and discharging chip is located at the first structural member; the second battery is connected to the first end of the charging and discharging chip via a flexible circuit board.

14. A power supply circuit, characterized in that: The power supply circuit includes an impedance module, a first battery, a first electronic device, a charge and discharge chip, a second battery, a second electronic device and a power module; The first end of the impedance module is connected to the first battery and the first electronic device, the second end of the impedance module is connected to the first end of the charge-discharge chip, the second battery and the second electronic device, and the second end of the charge-discharge chip is connected to the power module, so that the first battery alone supplies power to the first electronic device, the second battery alone supplies power to the second electronic device, and the first battery and the second battery supply power to the power module through the charge-discharge chip; The difference between the maximum current value and the average current value of the first electronic device is greater than or equal to a first threshold, and the difference between the maximum current value and the average current value of the second electronic device is greater than or equal to the first threshold; The power consumption module includes multiple electronic devices, the average current value of any one of the multiple electronic devices is greater than the average current value of the first electronic device, and the average current value of any one of the multiple electronic devices is greater than the average current value of the second electronic device.

15. The power supply circuit according to claim 14, characterized in that: An average current value of the first electronic device is less than or equal to a second threshold, and an average current value of the second electronic device is less than or equal to a second threshold.

16. The power supply circuit according to claim 15, characterized in that: The difference between the maximum current value and the average current value of any one of the electronic components is less than a third threshold, and the third threshold is less than or equal to the first threshold.

17. The power supply circuit according to claim 16, characterized in that: The average current value of any one of the electronic components is greater than a fourth threshold, and the fourth threshold is greater than or equal to the second threshold.

18. The power supply circuit according to claim 14, characterized in that: The rated capacity of the first battery is greater than the rated capacity of the second battery, and the power consumption of the first electronic device within a preset time period is greater than the power consumption of the second electronic device within the preset time period.

19. The power supply circuit according to claim 14, characterized in that: The rated capacity of the first battery is greater than the rated capacity of the second battery, and the average current value of the first electronic device is greater than the average current value of the second electronic device.

20. The power supply circuit according to claim 14, characterized in that: The power supply circuit also includes: a third electronic device, which is connected to the first battery; the rated capacity of the first battery is greater than the rated capacity of the second battery, and the sum of the power consumption of the first electronic device within a preset time period and the power consumption of the third electronic device within the preset time period is greater than the power consumption of the second electronic device within the preset time period.

21. The power supply circuit according to any one of claims 14 to 20, characterized in that: The first electronic device is an audio power amplifier or a radio frequency power amplifier, and the second electronic device is an audio power amplifier or a radio frequency power amplifier.

22. The power supply circuit according to any one of claims 14 to 20, characterized in that: The impedance module includes a first transistor, a second transistor and a controller; The first end of the first transistor is connected to the first battery and the first electronic device, the second end of the first transistor is connected to the first end of the second transistor, and the second end of the second transistor is connected to the first end of the charging and discharging chip, the second battery and the second electronic device; The controller is connected to the control end of the first transistor and the control end of the second transistor, and is used to control the voltage of the control end of the first transistor and the control end of the second transistor so that the voltage output by the first battery to the first end of the charge and discharge chip through the impedance module is equal to the voltage output by the second battery to the first end of the charge and discharge chip.

23. The power supply circuit according to claim 22, characterized in that: The impedance module further includes: a first resistor, a third transistor, a first capacitor, a second resistor, a second capacitor and a third resistor; The first end of the first resistor is connected to the second end of the first transistor and the first end of the second transistor, the second end of the first resistor is connected to the first end of the third transistor, the control end of the first transistor and the control end of the second transistor, and the second end of the third transistor is connected to the ground line; The first plate of the first capacitor is connected to the first end of the third transistor, and the second plate of the first capacitor is connected to the second end of the third transistor; A first end of the second resistor is connected to the controller, and a second end of the second resistor is connected to the control end of the third transistor; The first plate of the second capacitor is connected to the control terminal of the third transistor, and the second plate of the second capacitor is connected to the second terminal of the third transistor; A first end of the third resistor is connected to the control end of the third transistor, and a second end of the third resistor is connected to the second end of the third transistor.

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