Power supply system, charging method, and discharging method

Abstract

A power supply system, a charging method and a power supply method, the power supply system comprising a first switch (K1), a second switch (K2), a first switched capacitor circuit (SC1), a second switched capacitor circuit (SC2), an inductive voltage conversion circuit (SL), an input end (Vin), a first charging end (Vc1) and a second charging end (Vc2); an input side (Vdi) of the inductive voltage conversion circuit (SL) is coupled to the input end (Vin); an output side (Vdo) of the inductive voltage conversion circuit (SL) is coupled to the first charging end (Vc1) through the first switch (K1) and is coupled to the second charging end (Vc2) through the second switch (K2); the first switched capacitor circuit (SC1) is coupled between the input end (Vin) and the first charging end (Vc1); the second switched capacitor circuit (SC2) is coupled between the input end (Vin) and the second charging end (Vc2). Thus, the charging of the parallel battery pack is applicable to multiple charging scenarios, the flexibility of the charging of the parallel battery pack is improved, and the endurance of the electronic device is improved.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to a power supply system, a charging method, and a discharging method. Background Technology

[0002] With the development of electronic technology, electronic device technology has also rapidly improved. In existing technologies, to improve the battery life of electronic devices, multiple batteries are typically incorporated to power the load. In scenarios where multiple batteries are used in an electronic device, they are usually charged in series, or a hybrid method of series and parallel connection is employed. Furthermore, external adapters cannot directly charge the batteries inside an electronic device; the device typically incorporates a charging circuit that converts the electrical energy supplied by the external adapter to output a suitable charging voltage and current for the battery. Additionally, when powering a load within an electronic device, a series connection of battery packs is also commonly used.

[0003] Because the charging voltage and current of each battery may differ due to factors such as battery aging, in traditional multi-battery charging and discharging scenarios, when charging batteries in series, the maximum charging current output by the charging circuit is limited by the charging current of each individual battery. This maximum charging current of a single battery may be significantly lower than that of the others. This reduces the charging speed of each battery and may also lead to undercharging of some batteries, resulting in uneven charging. When using series-connected batteries to power a load, since the operating voltage required by the load is lower than the output voltage of the series-connected batteries, a step-down circuit is typically needed to reduce the output voltage of the series-connected batteries to meet the load's operating conditions. However, using a step-down circuit leads to energy loss and reduces the battery life of electronic devices. Therefore, in multi-battery charging and discharging scenarios, how to charge each battery evenly and control the balanced power supply to the load from each battery to improve charging speed and the battery life of electronic devices becomes a problem that needs to be solved. Summary of the Invention

[0004] The power system, parallel battery pack charging method, and discharging method provided in this application can charge each battery evenly and control each battery to supply power to the load evenly, which is beneficial to improving the battery life of electronic devices.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, embodiments of this application provide a power supply system comprising a first switch, a second switch, a first switched capacitor circuit, a second switched capacitor circuit, an inductive voltage converter circuit, an input terminal, a first charging terminal, and a second charging terminal; the input side of the inductive voltage converter circuit is coupled to the input terminal; the output side of the inductive voltage converter circuit is coupled to the first charging terminal via the first switch and to the second charging terminal via the second switch; the first switched capacitor circuit is coupled between the input terminal and the first charging terminal; and the second switched capacitor circuit is coupled between the input terminal and the second charging terminal.

[0007] The power system provided in this application can charge batteries coupled to the first charging terminal and the second charging terminal respectively through an inductive voltage conversion circuit, and can also charge each battery separately through a first switched capacitor circuit and a second switched capacitor circuit. Thus, the battery charging mode can be flexibly adjusted based on the voltage of the first charging terminal and the voltage of the second charging terminal, and the batteries can be charged evenly, which is beneficial to improving the charging speed and life of each battery.

[0008] Based on the first aspect, in one possible implementation, the power supply system further includes a discharge terminal for supplying power to the load, the discharge terminal being simultaneously coupled between the inductive voltage conversion circuit and the first switch, and between the inductive voltage conversion circuit and the second switch.

[0009] Here, the output side of the inductive voltage conversion circuit is connected to one end of the first switch to form a first node, and the output side of the inductive voltage conversion circuit is connected to one end of the second switch to form a second node. The first node and the second node are connected together and have the same potential. The discharge terminal is connected to the first node and the second node. Therefore, by controlling the on or off state of the first switch and the second switch, the power system can discharge to the load through a single battery or to the load through a parallel battery pack based on the potentials of the first charging terminal, the second charging terminal, and the discharge terminal. This allows the parallel battery pack to discharge evenly, which is beneficial for improving the battery life of electronic devices.

[0010] Based on the first aspect, in one possible implementation, the power system further includes a first battery and a second battery, wherein the first charging terminal and the second charging terminal are respectively used to charge the first battery and the second battery.

[0011] Based on the first aspect, in one possible implementation, the power system further includes a control circuit, which is configured to: control the first switch and the second switch to turn off when the voltage of the first charging terminal and the voltage of the second charging terminal are both within a preset voltage range.

[0012] In this implementation, the first switched capacitor circuit and the second switched capacitor circuit charge the first battery and the second battery respectively, while the inductive voltage conversion circuit stops charging the batteries. At this time, the inductive voltage conversion circuit can provide electrical energy to the charging terminal to maintain the operation of the load.

[0013] It should be noted that, due to the internal structure of the switched capacitor circuit, the voltage on the input side of the switched capacitor circuit dynamically changes with the output voltage. Since both the first and second switched capacitor circuits are coupled to the input side of the inductive voltage converter circuit, the input voltage of the inductive voltage converter circuit will also fluctuate when both circuits are used simultaneously. Therefore, the selected inductive voltage converter circuit needs to be continuously adjustable over a wide range of input voltages (e.g., 5V to 12V) to consistently output a stable voltage suitable for battery charging.

[0014] Based on the first aspect, when the first and second switches are off and the load is powered by the inductive voltage conversion circuit, if the load consumes too much power, causing the voltage at the discharge terminal to suddenly drop, the control circuit can also be used to: control at least one of the first and second switches to turn on when at least one of the voltages at the first and second charging terminals is greater than a preset threshold voltage at the discharge terminal. For example, when the voltage at the first charging terminal is greater than the preset threshold voltage at the discharge terminal, the first switch can be turned on. In this case, the battery can replenish power to the load through the discharge terminal, thereby suppressing further drops in the voltage supplied to the load.

[0015] Based on the first aspect, in one possible implementation, the power supply system further includes a control circuit, which is configured to: control the inductive voltage conversion circuit to stop providing power when both the voltage of the first charging terminal and the voltage of the second charging terminal are within the preset voltage range; control the first switched capacitor circuit to provide power to the first charging terminal; and control the second switched capacitor circuit to provide power to the second charging terminal; wherein at least one of the first switch and the second switch is turned on.

[0016] In this implementation, the first and second switched capacitor circuits charge the first and second batteries respectively, while the inductive voltage conversion circuit stops charging the batteries. At this time, by controlling at least one switch to turn on, at least one battery supplies power to the load.

[0017] Based on the first aspect, in one possible implementation, the control circuit is further configured to: control the switched capacitor circuit coupled to the charging terminal exceeding the upper limit of the preset voltage range to stop providing power when at least one of the voltage of the first charging terminal and the voltage of the second charging terminal is higher than the upper limit of the preset voltage range.

[0018] Based on the first aspect, in one possible implementation, the control circuit is further configured to: control the first switch and the second switch to be turned on when both the voltage of the first charging terminal and the voltage of the second charging terminal are outside the preset voltage range.

[0019] At this time, the inductive voltage conversion circuit provides power to the first charging terminal and the second charging terminal, and the first switched capacitor circuit and the second switched capacitor circuit stop providing power.

[0020] Based on the first aspect, when the first switch is turned on, the second switch is turned off, and the first battery supplies power to the load, if the load consumes too much energy, causing the voltage at the discharge end to suddenly drop and fall below the preset threshold voltage at the second charging end, in one possible implementation, the control circuit is further configured to: control the second switch to turn on.

[0021] Based on the first aspect, in one possible implementation, the first switch and the second switch are transistors.

[0022] Based on the first aspect, in one possible implementation, when there is no voltage input at the input terminal and the load is powered by the first battery, the control circuit is further configured to: control the second switch to switch from a closed state to a linearly open state when the voltage at the second charging terminal is higher than a preset threshold voltage at the discharging terminal; after a preset time, control the first switch to switch from an open state to a closed state, and control the second switch to switch from a linearly open state to a fully open state.

[0023] Secondly, embodiments of this application provide a charging method for a parallel battery pack. The method includes: acquiring the voltage of a first charging terminal coupled to a first battery in the parallel battery pack and the voltage of a second charging terminal coupled to a second battery in the parallel battery pack; when both the voltage of the first charging terminal and the voltage of the second charging terminal are within a preset voltage range, controlling an inductive voltage conversion circuit coupled to the first charging terminal and the second charging terminal to stop providing power, controlling a first switched capacitor circuit coupled to the first charging terminal to provide power to the first charging terminal, controlling a second switched capacitor circuit coupled to the second charging terminal to provide power to the second charging terminal, and controlling at least one of a first switch and a second switch to turn on, wherein the first switch is coupled between the output side of the inductive voltage conversion circuit and the first charging terminal, and the second switch is coupled between the output side of the inductive voltage conversion circuit and the second charging terminal.

[0024] Based on the second aspect, in one possible implementation, the method further includes: when at least one of the voltage of the first charging terminal and the voltage of the second charging terminal is higher than the upper limit of the preset voltage range, controlling the switched capacitor circuit coupled to the charging terminal exceeding the upper limit of the preset voltage range to stop providing power.

[0025] Based on the second aspect, in one possible implementation, the method further includes: when the voltage of the first charging terminal and the voltage of the second charging terminal are both outside the preset voltage range, controlling both the first switch and the second switch to be turned on.

[0026] Based on the second aspect, in one possible implementation, the method further includes: controlling the second switch to turn on when the first switch is turned on, the second switch is turned off, and the voltage of the second charging terminal is higher than the voltage of the discharging terminal used to supply power to the load.

[0027] Based on the second aspect, in one possible implementation, after controlling the first switch coupled to the first charging terminal to be turned on, the method further includes: when at least one of the voltage of the first charging terminal and the voltage of the second charging terminal is less than the voltage of the discharging terminal, controlling the switch coupled to the charging terminal with a voltage less than the voltage of the discharging terminal to be turned off.

[0028] Thirdly, embodiments of this application provide a method for discharging a parallel battery pack, the method comprising: in response to a lack of voltage input to the power system, acquiring the voltage of a first charging terminal coupled to a first battery in the parallel battery pack and the voltage of a second charging terminal coupled to a second battery in the parallel battery pack; when the voltage of the first charging terminal is greater than the voltage of the second charging terminal, turning on a first switch; acquiring the voltage of a discharging terminal supplying power to a load; when the voltage of the discharging terminal is less than the voltage of the second charging terminal, turning on a second switch; wherein the first switch is coupled between the first charging terminal and the discharging terminal, and the second switch is coupled between the second charging terminal and the discharging terminal.

[0029] Based on the third aspect, in one possible implementation, when the voltage at the discharge terminal is less than the voltage at the second charging terminal, the method further includes: maintaining the first switch on.

[0030] Based on the third aspect, in one possible implementation, the first switch and the second switch are transistors.

[0031] Based on the third aspect, in one possible implementation, the method further includes: when the first switch is turned on, the second switch is turned off, and the voltage of the second charging terminal is higher than a preset threshold voltage of the discharging terminal, controlling the second switch to switch from a turned-off state to a linearly turned-on state; after a preset time, controlling the first switch to switch from a turned-on state to a turned-off state, and controlling the second switch to switch from a linearly turned-on state to a fully turned-on state. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of an application scenario of the power supply system provided in an embodiment of this application;

[0034] Figure 2a This is a schematic diagram of a power supply system provided in an embodiment of this application;

[0035] Figure 2b This is a schematic diagram of an inductive voltage conversion circuit provided in an embodiment of this application;

[0036] Figure 2c This is a schematic diagram of a switched capacitor circuit provided in an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the control circuit provided in an embodiment of this application;

[0038] Figure 4 This is a flowchart of a charging method provided in an embodiment of this application;

[0039] Figure 5 This is another structural schematic diagram of the power supply system provided in the embodiments of this application;

[0040] Figure 6 This is a flowchart of a power supply method provided in this application embodiment, in which the power supply system supplies power to the load when the switched capacitor circuit charges the battery;

[0041] Figure 7 This is a flowchart of a power supply method for supplying power to a load when there is no power input in the power system, as provided in an embodiment of this application.

[0042] Figure 8 This is a flowchart of a power supply method for a power system to supply power to a load in ECO mode, provided in an embodiment of this application. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] The terms "first," "second," and similar terms used in this article do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one" and similar terms do not indicate a quantity limitation, but rather indicate the existence of at least one. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect, equivalent to coupling or connection in a broad sense.

[0045] In the implementation of this application, "and / or" describes the relationship between related objects, indicating that there can be three kinds of relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0046] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0047] In the description of the embodiments, unless otherwise stated, "multiple" means two or more. For example, multiple batteries means two or more batteries.

[0048] Please refer to Figure 1 This illustration shows a schematic diagram of an application scenario for the power supply system provided in an embodiment of this application. Figure 1 The illustrated application scenario includes a power supply system 1, a power supply system 2, and a load 3. Power supply system 2 includes an input terminal Vin and a discharge terminal Vsys. Power supply system 1 is coupled to the input terminal Vin of power supply system 2, and the discharge terminal Vsys of power supply system 2 is coupled to the load 3. Furthermore, power supply system 2 can be coupled to multiple batteries connected in parallel. Power supply system 2 can obtain electrical energy from power supply system 1, supply the obtained electrical energy to the anode of the batteries to charge them, and supply the electrical energy input from power supply terminal 1 to the load through the discharge terminal Vsys to power the load. Power supply system 1 can be an active circuit, typically including a voltage source or current source, etc. The input terminal Vin of power supply system 2 can be connected to power supply system 1 via a transmission line (e.g., a USB cable). In addition, power supply system 1 can also include a power adapter, which converts the voltage supplied by the mains grid into a voltage suitable for power supply system 2 to input electrical energy into power supply system 2. Besides performing the charging function, power supply system 2 can also perform the discharging function. When performing the discharging function, this power supply system is used to control the flow of electrical energy from the batteries to the load 3. Load 3 can be various processors or other types of devices, such as graphics processing units (GPUs), central processing units (CPUs), etc. Load 3 can also be various integrated circuit chips, including but not limited to artificial intelligence chips, image processing chips, etc. No limitation is made here.

[0049] based on Figure 1 For the application scenarios shown, please continue to refer to [the documentation / reference]. Figure 2a The diagram shows a schematic representation of the power system 2 provided in an embodiment of this application.

[0050] like Figure 2aAs shown, the power supply system 2 includes an inductive voltage converter circuit SL, a first switch K1, a second switch K2, an input terminal Vin, a first charging terminal Vc1, and a second charging terminal Vc2. The inductive voltage converter circuit SL includes an input side Vdi and an output side Vdo. The input side Vdi of the inductive voltage converter circuit SL is coupled to the input terminal Vin of the power supply system 2. The output side Vdo of the inductive voltage converter circuit SL is coupled to one end of the first switch K1 and one end of the second switch K2; the other end of the first switch K1 is coupled to the first charging terminal Vc1, and the other end of the second switch K2 is coupled to the second charging terminal Vc2.

[0051] In this embodiment, the voltage supplied by power supply system 1 to power supply system 2 cannot usually be directly applied to the battery or the load. It needs to be converted by a voltage conversion circuit to a voltage that can directly power the load or meet the battery charging requirements. Specifically, the voltage conversion circuit can be a circuit that boosts or lowers the voltage input at input terminal Vin to output it through output side Vdo. Furthermore, the inductor-type voltage conversion circuit SL described in this embodiment can include, but is not limited to, a buck circuit, a boost circuit, or a boost-buck circuit. The specific choice between a buck circuit, a boost circuit, or a boost-buck circuit depends on the capacity of the battery connected to the first charging terminal Vc1 and the second charging terminal Vc2, and the supply voltage required for the load operation. The inductor-type voltage conversion circuit outputs electrical energy through the charging and discharging of an inductor. The structure and working principle of the inductor-type voltage conversion circuit are briefly explained below using a buck circuit as an example. Please refer to [link to relevant documentation]. Figure 2b It shows a schematic diagram of the Buck circuit. Figure 2bAs shown, the Buck circuit includes switches K3 and K4, inductor L0, and capacitor Ca. One end of switch K3, one end of switch K4, and one end of inductor L0 are coupled together. The other end of switch K3 is coupled to the input side Vdi of the Buck circuit, the other end of switch K4 is coupled to the common ground, and the other end of inductor L0 is coupled to the output side Vdo of the Buck circuit. Capacitor Ca is coupled between the output side Vdo and the common ground Gnd. In operation, during the first time period, switch K3 is turned on and switch K4 is turned off, and current flows through the input side Vdi to the inductor L0. Since the current across inductor L0 cannot change abruptly, it has the function of preventing current flow. At this time, most of the charge input from the input side Vdi is stored in inductor L0, a small portion of the charge passing through inductor L0 is stored in capacitor Ca, and the rest is output through the output side Vdo. During the second period, switch K4 is on and switch K3 is off, so no current flows into inductor L0. Inductor L0 has the function of suppressing current decrease. At this time, inductor L0, capacitor Ca, and common ground Gnd form a closed loop, and the charge stored in inductor L0 is output through the output terminal Vdo. Thus, in the inductor-type voltage conversion circuit, electrical energy is output by charging and discharging inductor L0. By controlling the value of inductor L0 and the duty cycle of switches K3 and K4, the output voltage can be regulated. In addition, inductor L0 usually has a high parasitic resistance. By making reasonable use of this parasitic resistance, trickle charging of the load can be achieved.

[0052] In this embodiment, the power supply system 2 further includes a first switched capacitor circuit SC1 and a second switched capacitor circuit SC2. The first switched capacitor circuit SC1 is coupled between the input terminal Vin and the first charging terminal Vc1, and the second switched capacitor circuit SC2 is coupled between the input terminal Vin and the second charging terminal Vc2. The switched capacitor circuit includes circuitry for charging and discharging the capacitor, and can output electrical energy either by discharging the capacitor or by directly connecting the output and input. Please refer to... Figure 2c The diagram illustrates the structure of a switched capacitor circuit. The switched capacitor circuit includes switches K5, K6, K7, and K8, and a capacitor Cb. One end of switch K5, one end of switch K6, and one end of capacitor Cb are coupled together. The other end of switch K5 is coupled to the input terminal Vin. The other end of switch K6 is coupled to the output terminal Vout of the switched capacitor circuit, which is also coupled to the charging terminal of power supply system 2 (e.g., the output terminal of the first switched capacitor circuit SC1 is coupled to the first charging terminal Vc1). The other end of capacitor C1 is coupled to one end of switch K7 and one end of switch K8. The other end of switch K7 is coupled to the common ground Gnd, and the other end of switch K8 is coupled to the output terminal Vout. Figure 2cThe switched capacitor circuit shown includes two operating simulations. In the first operating mode: during the first period, switches K5 and K8 are on, and switches K6 and K7 are off. At this time, the voltage input at the input terminal Vin is applied to the plates of capacitor Cb to charge it. The charge stored in capacitor Cb can also be output through the output terminal Vout. In the second period, switches K5 and K8 are off, and switches K6 and K7 are on. At this time, capacitor Cb discharges, and the charge stored in capacitor Cb is output through the output terminal Vout. Of course, Figure 2c The switched capacitor circuit also has a second operating mode: switches K5 and K6 are on, while switches K7 and K8 are off. In this mode, the input terminal Vin is directly connected to the output terminal Vout, and the electrical energy input at Vin is directly output through Vout. This demonstrates that the switched capacitor circuit uses capacitor Cb as the charging and discharging device, enabling the output of electrical energy either through capacitance or direct connection. Furthermore, the capacitor Cb in the switched capacitor circuit typically has low parasitic resistance, meaning that regardless of the operating mode, the switched capacitor circuit generally has higher energy conversion efficiency compared to inductive voltage conversion circuits, thus improving battery charging speed and reducing charging time. However, due to the high output power of the switched capacitor circuit, trickle charging is usually not possible.

[0053] The power system 2 provided in this application embodiment can charge batteries coupled to the first charging terminal Vc1 and the second charging terminal Vc2 respectively through an inductive voltage conversion circuit SL, and can also charge each battery separately through a first switched capacitor circuit SC1 and a second switched capacitor circuit SC2. Existing adapters typically support the inductive voltage conversion circuit SL, while switched capacitor circuits require a dedicated adapter. Therefore, by separately setting the inductive voltage conversion circuit SL, the first switched capacitor circuit SC1, and the second switched capacitor circuit SC2, the power system 2 described in this application embodiment can be applied to various charging scenarios. For example, when the adapter does not support the use of switched capacitor circuits, the inductive voltage conversion circuit SL can be used for charging; when the adapter supports the use of switched capacitor circuits, the cooperation between the inductive voltage conversion circuit SL and the switched capacitors can achieve fast battery charging.

[0054] Furthermore, when the adapter supports switched-capacitor circuit charging, due to the large output current of the switched-capacitor circuit, if the battery's anode voltage is too low, using the switched-capacitor circuit to charge the battery can easily cause undercharging, affecting battery life. In this case, an inductive voltage conversion circuit SL is needed for trickle charging. Conversely, if the battery's anode voltage is too high, using the switched-capacitor circuit to charge the battery can easily cause overcharging, potentially leading to battery explosion or other dangers. In this case, an inductive voltage conversion circuit SL is also needed for charging. Therefore, this embodiment of the application, by setting an inductive voltage conversion circuit SL, a first switched-capacitor circuit SC1, and a second switched-capacitor circuit SC2, can flexibly adjust the battery charging method based on the voltage of the first charging terminal Vc1 and the voltage of the second charging terminal Vc2, providing balanced charging for each battery, which is beneficial for improving the charging speed and lifespan of each battery.

[0055] Furthermore, in one possible implementation, the power system 2 may also include a first battery B1 and a second battery B2, such as... Figure 2a As shown in the diagram, the anodes of the first battery B1 and the second battery B2 are coupled to the first charging terminal Vc1 and the second charging terminal Vc2, respectively. In other words, the first battery B1 and the second battery B2 form a battery pack connected in parallel. Specifically, the anode of the first battery B1 is coupled to the output side Vdo of the inductive voltage conversion circuit SL through the first charging terminal Vc1 and the first switch K1, and the cathode of the first battery B1 is coupled to the common ground Gnd. The anode of the second battery B2 is coupled to the output side Vdo of the inductive voltage conversion circuit SL through the second charging terminal Vc2 and the second switch K2, and the cathode of the second battery B2 is coupled to the common ground Gnd. When the first switch K1 and the second switch K2 are closed, the first battery B1 and the second battery B2 form a battery pack connected in parallel.

[0056] It is understood that the figure schematically shows a parallel battery pack including two batteries. The embodiments of this application may also include more batteries. For example, the parallel battery pack may include a third battery, a fourth battery, and more batteries. Therefore, the power system 2 shown in the embodiments of this application may also include a third charging terminal, a fourth charging terminal, and more charging terminals. Correspondingly, the power system 2 may also include a third switched capacitor circuit coupled to the input terminal and the third charging terminal, a fourth switched capacitor circuit coupled to the input terminal and the fourth charging terminal, etc. The inductive voltage conversion circuit SL is coupled to the third charging terminal and the fourth charging terminal through the third switch and the fourth switch, respectively. The embodiments of this application will not elaborate on this.

[0057] Furthermore, the power supply system 2 shown in the embodiments of this application may also be provided with a control circuit, such as... Figure 3As shown. The control circuit may include a first data acquisition terminal A1, a second data acquisition terminal A2, a first control terminal C1, a second control terminal C2, a third control terminal C3, a fourth control terminal C4, and a fifth control terminal C5. Specifically, the first data acquisition terminal A1 of the control circuit is coupled to the first charging terminal Vc1 to obtain the voltage of the first charging terminal Vc1; the second data acquisition terminal A2 of the control circuit is coupled to the second charging terminal Vc2 to obtain the voltage of the second charging terminal Vc2; the first control terminal C1 of the control circuit is coupled to the control terminal of the first switch K1 to control the conduction and turn-off of the first switch K1; the second control terminal C2 of the control circuit is coupled to the control terminal of the second switch K2 to control the conduction and turn-off of the second switch K2; the third control terminal C3 of the control circuit is coupled to the enable terminal en1 of the inductive voltage conversion circuit SL to enable or de-enable the inductive voltage conversion circuit SL; the fourth control terminal C4 of the control circuit is coupled to the enable terminal en2 of the first switched capacitor circuit SC1 to enable or de-enable the first switched capacitor circuit SC1; and the fifth control terminal C5 of the control circuit is coupled to the enable terminal en3 of the second switched capacitor circuit SC2 to enable or de-enable the second switched capacitor circuit SC2. The enable terminals of the aforementioned circuits are used to receive enable signals or stop enable signals. Enable signals trigger the corresponding circuits to start operating and charge the battery, while stop enable signals trigger the corresponding circuits to stop operating and stop charging the battery. It should be noted that when the aforementioned circuits receive enable signals, they can automatically provide the electrical energy input at the input terminal Vin to the charging terminal to charge the battery based on a pre-set internal structure. Specifically, the control circuit can be a circuit composed of analog devices such as comparators, error amplifiers, and selectors. Furthermore, in some other scenarios, the control circuit can also be implemented using programmable logic devices, etc. This application does not limit the specific implementation of the control circuit. The control circuit can acquire the voltages of the first charging terminal Vc1 and the second charging terminal Vc2 through the first data acquisition terminal A1 and the second data acquisition terminal A2, respectively. Based on the voltages of the first charging terminal Vc1 and the second charging terminal Vc2, the third control terminal C3 controls the inductive voltage conversion circuit SL to enable, so that the inductive voltage conversion circuit SL charges the first battery B1 and the second battery B2 through the first charging terminal Vc1 and the second charging terminal Vc2, respectively. Furthermore, the control circuit can also, based on the voltages at the first charging terminal Vc1 and the second charging terminal Vc2, control the inductive voltage conversion circuit SL to deactivate and the first switched capacitor circuit SC1 and the second switched capacitor circuit SC2 to enable. The first switched capacitor circuit SC1 and the second switched capacitor circuit SC2 charge the first battery B1 and the second battery B2 respectively through the first charging terminal Vc1 and the second charging terminal Vc2. The following is in conjunction with... Figure 4 The flowchart 400 of the charging method shown describes in detail the charging method of the power system 2 charging the battery.

[0058] Step 401: The control circuit acquires the voltages of the first charging terminal Vc1 and the second charging terminal Vc2.

[0059] Step 402: The control circuit determines whether either the voltage of the first charging terminal Vc1 or the voltage of the second charging terminal Vc2 is lower than the preset voltage range lower limit.

[0060] The aforementioned preset voltage range is determined based on battery performance parameters, including but not limited to: battery capacity, charging current that the battery can withstand, and charging voltage. When either the voltage at the first charging terminal Vc1 or the voltage at the second charging terminal Vc2 is lower than the lower limit of the preset voltage range, it indicates that the battery voltage is too low. Using a switched capacitor circuit to charge the battery in this case can easily cause excessive current surges, reducing battery life. In this situation, an inductive voltage conversion circuit SL is used to charge each battery, i.e., step 403 is executed. When both the voltage at the first charging terminal Vc1 and the voltage at the second charging terminal Vc2 are higher than the lower limit of the preset voltage range, step 404 is executed.

[0061] Step 403: The control circuit controls the inductive voltage conversion circuit SL to charge the first battery B1 and the second battery B2.

[0062] The control circuit enables the inductive voltage converter circuit SL, turns on the first switch K1 and the second switch K2, and disables the first switched capacitor circuit SC1 and the second switched capacitor circuit SC2. The current output from the output side Vdo of the inductive voltage converter circuit SL flows into the first battery B1 and the second battery B2 through the first charging terminal Vc1 and the second charging terminal Vc2, respectively, thereby charging the first battery B1 and the second battery B2.

[0063] Step 404: The control circuit determines whether the voltage of the first charging terminal Vc1 and the voltage of the second charging terminal Vc2 are both higher than the upper limit of the preset voltage range.

[0064] When the voltage at the first charging terminal Vc1 and the voltage at the second charging terminal Vc2 are both higher than the upper limit of the preset voltage range, it indicates that the battery is about to be fully charged. Using a switched capacitor circuit to charge the battery can easily cause excessive current surges to the battery. At this time, an inductive voltage conversion circuit SL is used to charge each battery, i.e., step 403 is executed; when at least one of the voltages at the first charging terminal Vc1 and the second charging terminal Vc2 is lower than the upper limit of the preset voltage range, step 405 is executed.

[0065] Step 405: The control circuit stops enabling the inductive voltage conversion circuit SL and enables at least one of the first switched capacitor circuit SC1 and the second switched capacitor circuit SC2.

[0066] In a specific implementation, the control circuit can also determine whether either the voltage of the first charging terminal Vc1 or the voltage of the second charging terminal Vc2 is higher than the upper limit of a preset voltage range.

[0067] When the voltage at the first charging terminal Vc1 and the voltage at the second charging terminal Vc2 are both lower than the upper limit of the preset voltage range, the control circuit controls the inductive voltage conversion circuit SL to stop being enabled, and controls the first switched capacitor circuit SC1 and the second switched capacitor circuit SC2 to be enabled. At this time, the current output from the output side of the first switched capacitor circuit SC1 flows into the first battery B1 through the first charging terminal Vc1 to charge the first battery B1, and the current output from the output side of the second switched capacitor circuit SC2 flows into the second battery B2 through the second charging terminal Vc2 to charge the second battery B2.

[0068] When the voltage at one of the charging terminals exceeds the upper limit of the preset voltage range, it indicates that the battery corresponding to that charging terminal is about to be fully charged. At this point, using a switched-capacitor circuit to charge the battery at this time could easily cause excessive current surges to the battery. Therefore, the control circuit can deactivate the switched-capacitor circuit coupled to the charging terminal with the voltage exceeding the preset voltage range. Taking the first battery B1 as an example, when the control circuit detects that the voltage at the first charging terminal Vc1 is higher than the upper limit of the preset voltage range, it controls the first switched-capacitor circuit SC1 to deactivate. It should be noted that at this time, no circuit is charging the first battery B1; it can wait until the voltage at the second charging terminal Vc2 exceeds the upper limit of the preset voltage range before the inductive voltage conversion circuit SL simultaneously charges all batteries, i.e., step 403 is executed.

[0069] It should be noted that, in this embodiment, since both the input side of the switched capacitor circuit and the input side of the inductive voltage converter circuit SL are coupled to the input terminal Vin, when the switched capacitor circuit is used to charge one battery and the inductive voltage converter circuit SL is used to charge the other battery at the same time (for example, the inductive voltage converter circuit SL is used to charge the first battery B1 and the second switched capacitor circuit SC2 is used to charge the second battery B2), based on the following... Figure 2cThe structure of the switched capacitor circuit shown is such that when the switched capacitor circuit is used to charge the battery in a direct connection manner, the voltage on the input side of the switched capacitor circuit changes dynamically with the change of the output voltage. That is, the voltage input to the input side of the inductor voltage converter circuit SL changes dynamically within a certain range. This requires the inductor voltage converter circuit SL to be able to continuously adjust the voltage input to the input side within a wide range (e.g., the voltage range of 5V to 12V) in order to continuously output a stable voltage suitable for battery charging. Traditional inductive voltage converter circuits (SLs) typically convert the voltage of a specific parameter input (e.g., 5V, 9V, or 12V) to output a stable voltage suitable for battery charging. They cannot continuously adjust over a wide voltage range. When using a switched capacitor circuit and a traditional inductive voltage converter circuit (SL) to charge different batteries simultaneously, the output voltage of the inductive voltage converter circuit (SL) becomes unstable, leading to overcharging or undercharging and potentially damaging the battery. Conversely, using an inductive voltage converter circuit (SL) with continuously adjustable over a wide input voltage range places higher demands on its circuit structure, increasing the complexity of its design.

[0070] In summary, as Figure 4 In the illustrated embodiment, when either the voltage at the first charging terminal Vc1 or the voltage at the second charging terminal Vc2 is below the lower limit of a preset voltage range, an inductive voltage conversion circuit SL simultaneously charges the battery. When both charging terminals are above the lower limit of the preset voltage range but below the upper limit, a switched capacitor circuit simultaneously charges the battery. When both charging terminals are above the upper limit of the preset voltage range, the inductive voltage conversion circuit SL simultaneously charges the battery. This allows a stable voltage to be output for battery charging using a traditional inductive voltage conversion circuit SL, reducing the design and manufacturing costs of the inductive voltage conversion circuit SL.

[0071] Furthermore, when the inductive voltage conversion circuit SL can continuously adjust the input voltage over a wide range, the batteries can be charged independently, meaning the two batteries do not need to be bundled together for charging. For example, when the voltage at the first charging terminal Vc1 is less than the lower limit of a preset voltage range and the voltage at the second charging terminal Vc2 is higher than the upper limit of a preset voltage range, the first switch K1 can be turned on and the second switch K2 can be turned off. The inductive voltage conversion circuit SL charges the first battery B1, and the second capacitor switch circuit SC2 charges the second battery B2. Conversely, when the voltage at the first charging terminal Vc1 is between the lower and upper limits of a preset voltage range, and the voltage at the second charging terminal Vc2 is higher than the upper limit of a preset voltage range, the first switch K1 can be turned off and the second switch K2 can be turned on. The first capacitor switch circuit SC1 charges the first battery B1, and the inductive voltage conversion circuit SL charges the second battery B2.

[0072] In one possible implementation of this application embodiment, the first switch K1 and the second switch K2 can be transistors. Current can flow from the source to the drain, or vice versa, based on the voltage difference between the source and drain. The transistor can be turned on or off based on the gate voltage. Furthermore, the transistor's operating state when on can be divided into a linear state and a fully on state. When the voltage applied to the transistor's gate is less than the start-up voltage threshold, the transistor is turned off or cut off. When the voltage applied to the transistor's gate is greater than the start-up voltage threshold, the current between the transistor's drain and source changes with the voltage between the drain and source; at this time, the transistor is in a linear state, also known as a variable resistance state. When the current between the transistor's drain and source no longer changes with the voltage between the drain and source, the transistor operates in a fully on state, also known as a saturation state or a constant current state. Furthermore, by adjusting the transistor's gate voltage, the magnitude of the current between the drain and source when the transistor enters the saturation state can be adjusted. When the first switch K1 and the second switch K2 are both transistors, the structure of the power supply system 2 is as follows: Figure 5 As shown. At this time, as Figure 3 The control terminal C1 of the control circuit shown is coupled to the gate of transistor K1, and the control terminal C2 of the control circuit is coupled to the gate of transistor K2.

[0073] based on Figure 4 The battery charging method shown, when using such Figure 5 When the power supply system is shown, such as Figure 4When the inductive voltage conversion circuit SL in step 403 charges the battery, it can include multiple charging stages, such as trickle charging, constant current charging, and constant voltage charging. Specifically, the control circuit adjusts the gate voltages, source, and drain of transistors BF1 and BF2 based on the voltages of the first charging terminal Vc1 and the second charging terminal Vc2, respectively, to achieve trickle charging, constant current charging, and constant voltage charging. Taking the charging of the first battery B1 by the inductive voltage conversion circuit SL through transistor K1 and the first charging terminal Vc1 as an example, the control circuit compares the voltage of the first charging terminal Vc1 with a first preset voltage threshold. When it determines that the voltage of the first charging terminal Vc1 is less than the first preset voltage threshold, it reduces the gate voltage applied to transistor K1, or controls the inductive voltage conversion circuit SL to reduce the voltage on the output side Vdo to reduce the voltage applied between the source and drain of transistor K1, thereby giving transistor K1 a higher impedance to reduce the current flowing into the first charging terminal Vc1, thus achieving trickle charging. As the charging time increases, the voltage at the first charging terminal Vc1 rises. When the control circuit detects that the voltage at the first charging terminal Vc1 is higher than the aforementioned first preset voltage threshold, it controls the inductive voltage converter circuit SL to increase the voltage on the output side Vdo to increase the voltage between the source and drain of transistor K1, thereby enabling transistor K1 to be fully turned on and achieving constant current charging or constant voltage charging. Furthermore, the control circuit can also increase the gate voltage of transistor K1 to increase the charging current. The charging method of the inductive voltage converter circuit SL to the second battery B2 is described in the same way as the charging method of the inductive voltage converter circuit SL to the first battery B1, and will not be repeated here.

[0074] It should be noted that in other application scenarios, the first switched capacitor circuit SC1 and the second switched capacitor circuit SC2 can be omitted, and only the inductive voltage conversion circuit SL can be used to charge the first battery B1 and the second battery B2 until the batteries are fully charged.

[0075] Please continue to refer to this. Figure 2a and Figure 5 ,exist Figure 2a and Figure 5 In the power supply system 2, a discharge terminal Vsys for supplying power to the load is also included. Specifically, the output side Vdo of the inductive voltage conversion circuit SL is coupled to one end of the first switch K1 to form a first node a1, and the output side Vdo of the inductive voltage conversion circuit SL is coupled to one end of the second switch K2 to form a second node a2. The first node a1 and the second node a2 are coupled together and have the same potential. The discharge terminal Vsys is coupled together with the first node a1 and the second node a2.

[0076] In this embodiment, when the power system 2 charges the battery, to prevent the load from failing to operate due to insufficient power supply, the inductive voltage conversion circuit SL can also supply power to the load through its discharge terminal Vsys while charging the battery; or, when the switched capacitor circuit charges the battery, since the inductive voltage conversion circuit SL is not enabled at this time, one of the batteries can be used to supply power to the load. A detailed description follows.

[0077] When the inductive voltage converter circuit SL charges the battery, part of the current output from the output side Vdo of the inductive voltage converter circuit SL is supplied to the first charging terminal Vc1 to charge the first battery B1, part is supplied to the second charging terminal Vc2 to charge the second battery B2, and the remaining part is supplied to the load through the discharging terminal Vsys to supply power to the load. Typically, when the inductive voltage converter circuit SL charges the battery, the voltage at the discharging terminal Vsys (i.e., the voltage at node a1, the voltage at node a2, or the voltage at the output side Vdo of the inductive voltage converter circuit SL) is higher than the voltage at the first charging terminal Vc1 and also higher than the voltage at the second charging terminal Vc2. Current flows from node a and node b to the first charging terminal Vc1 and the second charging terminal Vc2, respectively. When the voltage at the discharging terminal Vsys suddenly drops below the voltage of a certain charging terminal due to excessive load power consumption, the battery coupled to that charging terminal replenishes power to the load through the discharging terminal Vsys based on the voltage difference between the charging terminal and the discharging terminal Vsys. Because the battery and the inductive voltage conversion circuit SL simultaneously supply power to the load, the voltage at the discharge terminal Vsys rises. When the voltage at the discharge terminal Vsys rises above the charging terminal voltage, the inductive voltage conversion circuit SL continues to charge the battery and supplies power to the load through the discharge terminal Vsys. It should be noted that because the charging of the first battery B1 and the second battery B2 is independent, and due to factors such as the aging rate of each battery, the potentials at the first charging terminal Vc1 and the second charging terminal Vc2 are usually not equal. The first battery B1 and the second battery B2 may simultaneously provide reverse charging to the load, or one of the batteries may provide reverse charging to the load, depending on the voltage at the charging terminal.

[0078] When the switched capacitor circuit charges the battery, it can use a single-cell alternating power supply method to power the load. The method of the battery supplying power to the load through the discharge terminal Vsys is as follows: Figure 6 The process 600 shown includes the following steps:

[0079] Step 601: The control circuit obtains the voltage of the first charging terminal Vc1 and the voltage of the second charging terminal Vc2.

[0080] Step 602: The control circuit compares the voltage of the first charging terminal Vc1 with the voltage of the second charging terminal Vc2 and determines the larger value between the voltage of the first charging terminal Vc1 and the voltage of the second charging terminal Vc2.

[0081] Step 603: Use the battery corresponding to the larger charging terminal to supply power to the load.

[0082] In this embodiment, the control circuit assumes that the voltage of the first charging terminal Vc1 is higher than the voltage of the second charging terminal Vc2. At this time, it controls the first switch K1 to turn on and the second switch K2 to turn off, and the first battery B1 supplies power to the load through the discharge terminal Vsys.

[0083] The control circuit can also continue to collect the voltage of the first charging terminal Vc1 and the second charging terminal Vc2, compare the voltage of the first charging terminal Vc1 and the second charging terminal Vc2, and when it is detected that the voltage of the second charging terminal Vc2 is higher than the voltage of the first charging terminal Vc1, control the second switch K2 to turn on and control the first switch K1 to turn off, so that the second battery B2 supplies power to the load through the discharge terminal Vsys.

[0084] based on Figure 6 In one possible implementation of the method shown, when the voltage at the discharge terminal Vsys suddenly drops below the lower of the charging terminal voltages due to excessive load power consumption, the parallel-connected batteries can simultaneously replenish the load's power through the discharge terminal Vsys. Since multiple batteries supply power to the load simultaneously, the voltage at the discharge terminal Vsys recovers. When the voltage at the discharge terminal Vsys recovers to a level higher than the lower of the charging terminal voltages, a single battery supplies power to the load. Specifically, assuming that when the first battery B1 supplies power to the load, the control circuit can also acquire the voltage at the discharge terminal Vsys (i.e., node a1, node a2, or the output side Vdo of the inductive voltage conversion circuit SL), compare the voltage at the discharge terminal Vsys with the voltage at the second charging terminal Vc2, and based on the comparison result, when it is determined that the voltage at the discharge terminal Vsys is lower than a preset threshold for the voltage at the second charging terminal Vc2, control the second switch K2 to turn on. At this time, the first battery B1 and the second battery B2 simultaneously supply power to the load through the discharge terminal Vsys. When the voltage at the discharge terminal Vsys is higher than the voltage at the second charging terminal Vc2, the second switch K2 is turned off, and the second battery B2 stops supplying power to the load.

[0085] The above describes the charging method for the first battery B1 and the second battery B2 when there is electrical input at the input terminal Vin of the power system, as well as the method for supplying power to the load while the batteries are charging. The following describes the power supply method for the first battery B1 and the second battery B2 to supply power to the load when there is no electrical input at the input terminal Vin of the power system. When there is no electrical input at the input terminal Vin of the power system, the inductor-type voltage conversion circuit SL, the first capacitor switching circuit SC1, and the second capacitor switching circuit SC2 are all deactivated.

[0086] Please continue to refer to this. Figure 2a or Figure 5 , combined Figure 7 The process 700 shown describes in detail the power supply method in which the first battery B1 and the second battery B2 supply power to the load when there is no power input at the input terminal Vin of the power system.

[0087] Step 701: The control circuit obtains the voltage of the first charging terminal Vc1 and the voltage of the second charging terminal Vc2.

[0088] Step 702: Determine whether at least one of the first switch K1 and the second switch K2 is on.

[0089] When neither the first switch K1 nor the second switch K2 is conducting, it may be that the power supply system coupled to the input terminal of the power supply system has just been disconnected. In this case, steps 703-704 are executed to allow one of the batteries to supply power to the load, thus enabling the load to operate normally. When at least one of the first switch K1 and the second switch K2 is conducting, step 705 can be further executed.

[0090] Step 703: Compare the voltage of the first charging terminal Vc1 with the voltage of the second charging terminal Vc2, and determine the larger value between the voltage of the first charging terminal Vc1 and the voltage of the second charging terminal Vc2.

[0091] Step 704: Use the battery corresponding to the larger charging terminal to supply power to the load.

[0092] Based on steps 703 and 704, the following explanation is given with the voltage of the first charging terminal Vc1 being higher than the voltage of the second charging terminal Vc2. When the voltage of the first charging terminal Vc1 is higher than the voltage of the second charging terminal Vc2, the first switch K1 coupled to the first charging terminal Vc1 is turned on, thereby enabling the first battery B1 to supply power to the load through the discharge terminal Vsys.

[0093] Step 705: Determine whether both the first switch K1 and the second switch K2 are on.

[0094] When both the first switch K1 and the second switch K2 are on, it means that the first battery B1 and the second battery B2 are simultaneously supplying power to the load through the discharge terminal Vsys. At this time, the current on / off state of each switch can be kept unchanged, that is, step 706 is executed. When one of the first switch K1 and the second switch K2 is on, step 707 is further executed.

[0095] Step 706: Keep the current on / off state of each switch unchanged.

[0096] Step 707: Determine whether the voltage at the charging terminal corresponding to the non-conducting switch is lower than the voltage at the discharging terminal Vsys.

[0097] When the voltage at the charging terminal corresponding to the non-conducting switch is lower than the voltage at the discharging terminal Vsys, it indicates that the other battery still has sufficient power. In this case, the current on / off state of each switch can remain unchanged, i.e., step 706 can be executed. When the voltage at the charging terminal corresponding to the non-conducting switch is higher than or equal to the voltage at the discharging terminal Vsys, step 708 can be executed.

[0098] Step 708: Turn on the switch that is not currently in operation.

[0099] At this time, the first battery B1 and the second battery B2 together supply power to the load through the discharge terminal Vsys.

[0100] Based on steps 707-708, the following explanation is given using the example of the first switch K1 being on and the second switch K2 being off. When the first switch K1 is on, the first battery B1 supplies power to the load through the discharge terminal Vsys. The voltage at the discharge terminal Vsys is equal to the voltage at the first charging terminal Vc1 minus the on-state voltage drop of the first switch K1. Typically, the on-state voltage drop of the first switch K1 is very small and can be approximated, so the voltage at the discharge terminal Vsys is approximately equal to the voltage at the first charging terminal Vc1. As the discharge time of the first battery B1 increases, the anode voltage of the first battery B1 gradually decreases, that is, the voltage at the first charging terminal Vc1 gradually decreases. When the control circuit detects that the voltage at the first charging terminal Vc1 is less than or equal to the voltage at the second charging terminal Vc2, it controls the second switch K2 to be on. At this time, the first battery B1 and the second battery B2 jointly supply power to the load through the discharge terminal Vsys.

[0101] In one possible implementation, when there is no electrical input at the power system's input terminal Vin, the parallel battery pack's power supply mode also includes an ECO (Ecology, Conservation, Optimization) mode, which is a mode where individual cells in the battery pack alternately supply power to the load. When power system 2 is configured with ECO mode, the structure of power system 2 can be as follows: Figure 5As shown, both the first switch K1 and the second switch K2 are transistors. Specifically, when the power supply system 2 receives a signal from the upper-level system of the electronic device (e.g., the CPU) indicating that it should use ECO mode for power supply, it can supply power to the load in ECO mode. Specifically, in conjunction with... Figure 5 and Figure 8 The battery discharge method in ECO mode is described in detail. Figure 8 The flowchart 800 of a discharge method employing ECO mode is illustrated schematically. This discharge method specifically includes the following steps:

[0102] Step 801: The control circuit obtains the voltage of the first charging terminal Vc1 and the voltage of the second charging terminal Vc2.

[0103] Step 802: The control circuit determines whether one of the first switch K1 and the second switch K2 is currently on.

[0104] In this implementation, when the control circuit determines that both the first switch K1 and the second switch K2 are on, it can randomly turn off one of the switches, i.e., execute step 803. When the control circuit determines that one of the first switch K1 and the second switch K2 is on, it further executes step 804.

[0105] Step 803: The control circuit randomly turns off one of the switches.

[0106] Step 804: The control circuit determines whether the voltage at the charging terminal corresponding to the non-conducting switch is greater than or equal to the preset threshold voltage of the discharging terminal Vsys.

[0107] When it is determined that the voltage at the charging terminal corresponding to the non-conducting switch is not greater than or equal to the preset threshold voltage of the discharging terminal Vsys, proceed to step 805; when it is determined that the voltage at the charging terminal corresponding to the non-conducting switch is greater than or equal to the preset threshold voltage of the discharging terminal Vsys, proceed to step 806.

[0108] Step 805: Keep the current on / off state of each switch unchanged.

[0109] Step 806: Control the non-conducting switch to conduct and gradually increase the voltage at the control terminal of the switch.

[0110] Here, the control terminal of the switch is the gate of the transistor. By adjusting the gate of the transistor, the operating state of the transistor can be gradually changed from a linear state to a fully conducting state.

[0111] Step 807: After a preset time, control the remaining transistors to turn off.

[0112] After a preset time, the transistor that was turned on in step 806 is in a fully on state. At this point, the remaining transistors can be turned off, thus achieving the battery discharge transition.

[0113] The following is based on Figure 5 Taking the power system shown as an example, the battery discharge method in ECO mode is described through a specific scenario.

[0114] Power system 2 can detect the on / off state of the first transistor K1 and the second transistor K2. When both transistors K1 and K2 are detected to be on, one of them is randomly turned off. When the control circuit detects that one transistor is off, it maintains the current on / off state of all transistors. Assuming the second transistor K2 is currently off, the first battery supplies power to the load through the discharge terminal Vsys. The control circuit acquires the voltage of the second charging terminal Vc2 and the voltage of the discharge terminal Vsys. The control circuit determines whether the voltage of the second charging terminal Vc2 is greater than or equal to a preset threshold voltage of the power supply terminal Vsys. In response to the voltage of the second charging terminal Vc2 not being greater than or equal to the preset threshold voltage of the power supply terminal Vsys, the current on / off state of each transistor remains unchanged. In response to the voltage of the second charging terminal Vc2 being greater than or equal to the preset threshold voltage of the power supply terminal Vsys, the control circuit turns on the second transistor K2 and adjusts the gate voltage of the second transistor K2 so that the second transistor K2 operates in the linear operating region; after a preset time, the control circuit controls the second transistor K2 to operate in the fully conducting state and controls the first transistor K1 to turn off. At this time, the second battery B2 supplies power to the load through the discharge terminal Vsys.

[0115] By controlling the gate voltage of the second transistor K2 to make the second transistor work in the linear operating region, the voltage or current output from the discharge terminal Vsys to the load can be made unstable due to voltage or current instability during the switching of the first and second switches, thus ensuring the stability of the load operation.

[0116] This application also provides an electronic device. The electronic device can be a portable computer (such as a mobile phone), a laptop computer, a wearable electronic device (such as a smartwatch), a tablet computer, an augmented reality (AR) device, a virtual reality (VR) device, or an in-vehicle device, etc. Specifically, the electronic device shown in this application includes, for example... Figure 1 , Figure 2a or Figure 5 The power system shown in the embodiment.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power supply system, characterized in that, It includes a first switch, a second switch, a first switched capacitor circuit, a second switched capacitor circuit, an inductive voltage conversion circuit, an input terminal, a discharge terminal for supplying power to the load, a first charging terminal, and a second charging terminal; The input side of the inductive voltage conversion circuit is coupled to the input terminal; The output side of the inductive voltage conversion circuit is coupled to the first charging terminal via the first switch and to the second charging terminal via the second switch; The first switched capacitor circuit is coupled between the input terminal and the first charging terminal; The second switched capacitor circuit is coupled between the input terminal and the second charging terminal; The discharge terminal is simultaneously coupled between the inductive voltage conversion circuit and the first switch, and between the inductive voltage conversion circuit and the second switch.

2. The power supply system according to claim 1, characterized in that, The power system further includes a first battery and a second battery, and the first charging terminal and the second charging terminal are used to charge the first battery and the second battery, respectively.

3. The power supply system according to claim 1, characterized in that, The power supply system further includes a control circuit, which is used for: When the voltage of the first charging terminal and the voltage of the second charging terminal are both within a preset voltage range, the first switch and the second switch are controlled to turn off.

4. The power supply system according to claim 1, characterized in that, The power supply system further includes a control circuit, which is used for: When the voltage of the first charging terminal and the voltage of the second charging terminal are both within a preset voltage range, the inductive voltage conversion circuit is controlled to stop providing power, the first switched capacitor circuit is controlled to provide power to the first charging terminal, the second switched capacitor circuit is controlled to provide power to the second charging terminal, and at least one of the first switch and the second switch is controlled to be turned on.

5. The power supply system according to claim 4, characterized in that, The control circuit is also used for: When at least one of the voltages of the first charging terminal and the second charging terminal is higher than the upper limit of the preset voltage range, the switched capacitor circuit coupled to the charging terminal exceeding the upper limit of the preset voltage range is controlled to stop supplying power.

6. The power supply system according to any one of claims 3-5, characterized in that, The control circuit is also used for: When the voltage of the first charging terminal and the voltage of the second charging terminal are both outside the preset voltage range, the first switch and the second switch are controlled to be turned on.

7. The power supply system according to any one of claims 3-5, characterized in that, The control circuit is also used for: When at least one of the voltages of the first charging terminal and the second charging terminal is higher than a preset threshold voltage of the discharging terminal, at least one of the first switch and the second switch is turned on.

8. The power supply system according to claim 4 or 5, characterized in that, The control circuit is also used for: When the first switch is turned on, the second switch is turned off, and the voltage at the second charging terminal is higher than a preset threshold voltage at the discharging terminal, the second switch is controlled to turn on.

9. The power supply system according to any one of claims 3-5, characterized in that, The first switch and the second switch are transistors.

10. The power supply system according to claim 9, characterized in that, When there is no voltage input at the input terminal and the first switch is on, the control circuit is further configured to: When the voltage at the second charging terminal is higher than the preset threshold voltage at the discharging terminal, the second switch is controlled to switch from the off state to the linear conducting state. After a preset time, the first switch is controlled to change from the on state to the off state, and the second switch is controlled to change from the linear on state to the fully on state.

11. A charging method for a parallel battery pack, characterized in that, The method includes: The voltage of the first charging terminal coupled to the first battery in the parallel battery pack and the voltage of the second charging terminal coupled to the second battery in the parallel battery pack are obtained respectively. When the voltages of the first charging terminal and the second charging terminal are both within a preset voltage range, the inductive voltage conversion circuit coupled to the first and second charging terminals is controlled to stop supplying power. The first switched capacitor circuit coupled to the first charging terminal is controlled to supply power to the first charging terminal. The second switched capacitor circuit coupled to the second charging terminal is controlled to supply power to the second charging terminal. At least one of the first and second switches is controlled to turn on to supply power to the discharge terminal used to supply power to the load. The first switch is coupled between the output side of the inductive voltage conversion circuit and the first charging terminal. The second switch is coupled between the output side of the inductive voltage conversion circuit and the second charging terminal. The discharge terminal is simultaneously coupled between the inductive voltage conversion circuit and the first switch, and between the inductive voltage conversion circuit and the second switch.

12. The charging method according to claim 11, characterized in that, The method further includes: When at least one of the voltages of the first charging terminal and the second charging terminal is higher than the upper limit of the preset voltage range, the switched capacitor circuit coupled to the charging terminal exceeding the upper limit of the preset voltage range is controlled to stop supplying power.

13. The charging method according to claim 11 or 12, characterized in that, The method further includes: When the voltage of the first charging terminal and the voltage of the second charging terminal are both outside the preset voltage range, control both the first switch and the second switch to be turned on.

14. The charging method according to claim 11 or 12, characterized in that, The method further includes: When the first switch is turned on, the second switch is turned off, and the voltage at the second charging terminal is higher than the voltage at the discharging terminal used to supply power to the load, the second switch is controlled to turn on.

15. The method according to claim 14, characterized in that, After controlling the second switch to be turned on, the method further includes: When at least one of the voltages of the first charging terminal and the second charging terminal is less than the voltage of the discharging terminal, the switch coupled to the charging terminal whose voltage is less than the voltage of the discharging terminal is turned off.

16. A method for discharging a parallel battery pack, characterized in that, include: In response to the absence of voltage input to the power system, the voltage of the first charging terminal coupled to the first battery in the parallel battery pack and the voltage of the second charging terminal coupled to the second battery in the parallel battery pack are obtained. When the voltage at the first charging terminal is greater than the voltage at the second charging terminal, the first switch is turned on; Obtain the voltage at the discharge terminal that supplies power to the load; When the voltage at the discharge terminal is less than the voltage at the second charging terminal, the second switch is turned on; Wherein, the first switch is coupled between the first charging terminal and the discharging terminal, and the second switch is coupled between the second charging terminal and the discharging terminal; The first charging terminal is coupled to the output side of the inductive voltage conversion circuit through the first switch, the second charging terminal is coupled to the output side of the inductive voltage conversion circuit through the second switch, and the input side of the inductive voltage conversion circuit is coupled to the input terminal of the power supply system. The first charging terminal is coupled to the input terminal of the power system through a first switched capacitor circuit, and the second charging terminal is coupled to the input terminal of the power system through a second switched capacitor circuit. The discharge terminal is simultaneously coupled between the inductive voltage conversion circuit and the first switch, and between the inductive voltage conversion circuit and the second switch.

17. The method according to claim 16, characterized in that, When the voltage at the discharge terminal is less than the voltage at the second charging terminal, the method further includes: maintaining the first switch on.

18. The discharge method according to claim 16, characterized in that, The first switch and the second switch are transistors.

19. The discharge method according to claim 18, characterized in that, The method further includes: When the first switch is turned on, the second switch is turned off, and the voltage at the second charging terminal is higher than the preset threshold voltage at the discharging terminal, the second switch is controlled to switch from the off state to the linearly on state. After a preset time, the first switch is controlled to change from the on state to the off state, and the second switch is controlled to change from the linear on state to the fully on state.

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