Battery protection circuit including two switching units, battery assembly, and electronic device

Abstract

The invention provides a battery protection circuit comprising two switch units, the battery protection circuit comprises a main control unit and a first switch unit, the main control unit is connected with the control end of the first switch unit, the first switch unit is used for being connected with a first load in series, and the first switch unit is used for controlling whether a battery supplies power to the first load or not; the control end of the second switch unit is connected with the main control unit, the second switch unit is used for controlling whether a battery supplies power to a second load or not, and the power consumption of the second load is smaller than that of the first load during normal work; an over-discharge protection module; when the over-discharge protection module judges that the battery voltage is smaller than the first threshold voltage and larger than or equal to a preset second threshold voltage, the main control unit controls the first switch unit to be disconnected and controls the second switch unit to be turned on and turned on at least in part of time. The embodiment of the invention further provides a battery assembly and an electronic device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery protection, and in particular to a battery protection circuit including two switch units, a battery assembly and an electronic device. BACKGROUND

[0002] Battery assemblies are widely used in electronic devices, such as mobile phones, tablet computers, Bluetooth headsets, smart watches and other consumer electronics. The battery assembly is connected to the system circuit of the electronic device to provide a more flexible use environment for the electronic device without being limited by the range of the socket and the power supply wire. Generally, the battery assembly includes a battery, a battery protection circuit electrically connected to the battery, and the battery protection circuit is used to protect the battery from overcharging or overdischarging and other abnormal situations.

[0003] The battery protection circuit includes various protection units, such as overcharge protection units, overdischarge protection modules, charge overcurrent protection modules, discharge overcurrent protection modules, etc., to provide various protections for the battery. In order to provide protection, the battery protection unit collects battery voltage, current and other information and transmits it to each protection unit, and compares these information with the preset threshold to determine whether to protect.

[0004] Generally, as the system circuit is normally used, the battery power will gradually decrease, and when the battery power decreases to less than or equal to the threshold of the overdischarge protection module, the overdischarge protection module controls the main switch unit to be disconnected and cut off, and the system circuit is stopped from being powered. However, in some use scenarios, for example, the system circuit includes a remote positioning module, such as a GPS, etc., when the overdischarge protection is triggered, all system circuits are stopped from being powered, including the remote positioning module, resulting in the inability to perform positioning, especially in the scenario of a child wearing a smart watch, at this time the parents as the parents cannot locate the position of the child, resulting in the parents being very anxious, which is a very difficult problem, which seriously reduces the user experience. Moreover, the use time of the electronic device is generally 1-2 days, and after this time period, the overdischarge protection is triggered, resulting in the remote positioning function being frequently unavailable, which is inconvenient for normal use of the user and is not conducive to the safety of the user. SUMMARY

[0005] The technical problem to be solved by the embodiments of the present application is to provide a battery protection circuit including two switch units, a battery assembly and an electronic device to solve the problems of the prior art. The second load can still work when the battery voltage is relatively low.

[0006] In order to solve the above technical problems, the first aspect of the embodiments of the present application provides a battery protection circuit including two switch units, comprising:

[0007] The main control unit and the first switching unit are connected to the control terminal of the first switching unit. The first switching unit is used to connect in series with a first load and to control whether the battery supplies power to the first load.

[0008] The second switching unit is connected to the main control unit. The second switching unit is used to control whether the battery supplies power to the second load. Under normal operation, the power consumption of the second load is less than that of the first load.

[0009] The over-discharge protection module has its input terminal connected to the battery voltage and its output terminal connected to the main control unit.

[0010] Specifically, when the over-discharge protection module determines that the battery voltage is greater than or equal to a preset first threshold voltage, the main control unit controls both switching units to conduct normally. When the over-discharge protection module determines that the battery voltage is less than the first threshold voltage but greater than or equal to a preset second threshold voltage, the main control unit controls the first switching unit to disconnect and controls the second switching unit to conduct at least for a portion of the time. When the over-discharge protection module determines that the battery voltage is less than the second threshold voltage, the main control unit controls the battery to stop supplying power to the first load and the second load, wherein the second threshold voltage is less than the first threshold voltage.

[0011] Optionally, the second switching unit is connected in series with the second load, the first switching unit and the first load are located on the first branch, the second switching unit and the second load are located on the second branch, the first branch and the second branch are connected in parallel, wherein, during normal operation, the current flowing through the first load is greater than the current flowing through the second load;

[0012] Specifically, when the over-discharge protection module determines that the battery voltage is less than the second threshold voltage, the main control unit controls both switching units to disconnect and cut off.

[0013] Optionally, the first switching unit and the first load are located on the first branch, the second load is located on the second branch, the first branch and the second branch are connected in parallel, and the circuit formed after the parallel connection is connected in series with the second switching unit, wherein the current flowing through the first load is greater than the current flowing through the second load during normal operation.

[0014] Specifically, when the over-discharge protection module determines that the battery voltage is less than the second threshold voltage, the main control unit controls the second switching unit to disconnect and cut off.

[0015] Optionally, the battery protection circuit further includes a battery voltage sampling unit, which is connected to the positive terminal and the negative terminal of the battery. The battery voltage sampling unit is used to sample the battery voltage to obtain a first sampling voltage. The over-discharge protection module is connected to the first sampling voltage. The over-discharge protection module is also connected to a first reference voltage and a second reference voltage, wherein the second reference voltage is less than the first reference voltage.

[0016] Specifically, when the over-discharge protection module determines that the first sampling voltage is greater than or equal to the first reference voltage, the main control unit controls both switching units to conduct normally. When the over-discharge protection module determines that the first sampling voltage is less than the first reference voltage but greater than or equal to the second reference voltage, the main control unit disconnects the first switching unit and controls the second switching unit to conduct for at least part of the time. When the over-discharge protection module determines that the first sampling voltage is less than the second reference voltage, the main control unit controls the battery to stop supplying power to the first load and the second load.

[0017] Optionally, the battery protection circuit further includes a battery voltage sampling unit, which is connected to the positive terminal and the negative terminal of the battery. The battery voltage sampling unit is used to sample the battery voltage to obtain a first sampling voltage and a second sampling voltage. The first sampling voltage and the second sampling voltage are both used to characterize the same battery voltage. The first sampling voltage is less than the second sampling voltage. The over-discharge protection module is connected to the first sampling voltage and the second sampling voltage. The over-discharge protection module is also connected to a first reference voltage.

[0018] Specifically, when the over-discharge protection module determines that the first sampling voltage is greater than or equal to the first reference voltage, the main control unit controls both switching units to conduct normally. When the over-discharge protection module determines that the second sampling voltage is greater than or equal to the first reference voltage and the first sampling voltage is less than the first reference voltage, the main control unit controls the first switching unit to disconnect and controls the second switching unit to conduct at least for a portion of the time. When the second sampling voltage is less than the first reference voltage, the main control unit controls the battery to stop supplying power to the first load and the second load.

[0019] Optionally, when the battery voltage is less than the first threshold voltage and greater than or equal to the second threshold voltage, the main control unit controls the second switching unit to be turned on intermittently.

[0020] Optionally, when the battery voltage is less than the first threshold voltage and greater than or equal to the second threshold voltage, the duty cycle of the second switching unit decreases step by step as the battery voltage decreases.

[0021] Optionally, the over-discharge protection module includes a first over-discharge protection unit and n over-discharge protection sub-units, where n is an integer greater than or equal to 2. The input terminal of the first over-discharge protection unit is connected to a first sampling voltage and a first reference voltage. The input terminals of the n over-discharge protection sub-units are respectively connected to a first sampling voltage, a second first reference sub-voltage, a second second reference sub-voltage, ..., a second nth reference sub-voltage. The first sampling voltage is used to characterize the battery voltage, and the first reference voltage > the second first reference sub-voltage > the second second reference sub-voltage > ... > the second nth reference sub-voltage. The first reference voltage corresponds to the first threshold voltage, and the second nth reference sub-voltage corresponds to the second threshold voltage. The first over-discharge protection unit is used to compare the magnitude of the first sampling voltage with the first reference voltage, and the n over-discharge protection sub-units are used to compare the magnitude of the first sampling voltage with the corresponding reference sub-voltage.

[0022] Wherein, when the first sampling voltage is less than the first reference voltage and greater than or equal to the second first reference sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D1; when the first sampling voltage is less than the second first reference sub-voltage and greater than or equal to the second second reference sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D2, ...; when the first sampling voltage is less than the second (n-2) reference sub-voltage and greater than or equal to the second (n-1) reference sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D(n-1); when the first sampling voltage is less than the second (n-1) reference sub-voltage and greater than or equal to the second n reference sub-voltage, the main control unit controls the duty cycle of the second switching unit to be Dn; when the first sampling voltage is less than the second n reference sub-voltage, the main control unit controls the second switching unit to be normally open, wherein 1 > D1 > D2 > ... > Dn > 0.

[0023] Optionally, the over-discharge protection module includes a first over-discharge protection unit and n over-discharge protection sub-units, where n is an integer greater than or equal to 2. The input terminal of the first over-discharge protection unit is connected to a first sampling voltage and a first reference voltage. The input terminals of the n over-discharge protection sub-units are respectively connected to a second first sampling sub-voltage, a second second sampling sub-voltage, ..., a second nth sampling sub-voltage, and a first reference voltage. The first sampling voltage, the second first sampling sub-voltage, the second second sampling voltage, ..., the second nth sampling sub-voltage are all used to characterize the battery voltage. The first sampling voltage < the second first sampling sub-voltage < the second second sampling voltage < ... < the second nth sampling sub-voltage. The first over-discharge protection unit is used to compare the magnitude of the first sampling voltage with the first reference voltage, and the n over-discharge protection sub-units are used to compare the magnitude of the first reference voltage with the corresponding sampling sub-voltage.

[0024] Wherein, when the first reference voltage is greater than the first sampling sub-voltage and less than or equal to the second sampling sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D1; when the first reference voltage is greater than the second sampling sub-voltage and less than or equal to the second sampling sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D2, ...; when the first reference voltage is greater than the second (n-2) sampling sub-voltage and less than or equal to the second (n-1) sampling sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D(n-1); when the first reference voltage is greater than the second (n-1) sampling sub-voltage and less than or equal to the nth sampling sub-voltage, the main control unit controls the duty cycle of the second switching unit to be Dn; when the first reference voltage is greater than the nth sampling sub-voltage, the main control unit controls the second switching unit to be normally open, wherein 1 > D1 > D2 > ... > Dn > 0.

[0025] Optionally, the battery protection circuit further includes an overcurrent protection module, whose first input terminal is connected to a third sampling voltage, whose second input terminal is connected to a current threshold, and whose output terminal is connected to the main control unit. When the third sampling voltage is greater than or equal to the current threshold and lasts for a third delay, the main control unit controls the battery to stop supplying power to the first load and the second load. The third sampling voltage is used to characterize the sum of the currents flowing through the first load and the second load.

[0026] As the duty cycle of the second switching unit decreases step by step, the third delay duration decreases step by step.

[0027] Optionally, the battery protection circuit further includes an overcurrent protection module, whose first input terminal is connected to a third sampling voltage, whose second input terminal is connected to a third current threshold or a fourth current threshold, and whose output terminal is connected to the main control unit. When the signal at the first input terminal of the overcurrent protection module is greater than or equal to the signal at its second input terminal, the main control unit controls the battery to stop discharging.

[0028] The third sampling voltage is used to characterize the sum of the currents flowing through the first load and the second load. When the battery voltage is greater than or equal to the first threshold voltage, the second input terminal of the overcurrent protection module is connected to the third current threshold. When the battery voltage is less than the first threshold voltage, the second input terminal of the overcurrent protection module is connected to the fourth current threshold, which is less than the third current threshold.

[0029] Optionally, the battery protection circuit further includes a boost unit connected in series with the second load. The first end of the boost unit is connected to the positive terminal of the battery, and the second end of the boost unit is connected to the second load. The boost unit is used to boost the battery voltage when it is low to supply power to the second load.

[0030] Optionally, the control terminal of the boost unit is connected to the main control unit, and the battery protection circuit further includes a voltage judgment unit, the first input terminal of which is connected to the battery voltage, and its output terminal is connected to the main control unit;

[0031] Specifically, when the battery voltage is greater than or equal to a preset fifth threshold voltage, the main control unit controls the boost unit to enable it to save energy; when the battery voltage is less than the fifth threshold voltage, the main control unit controls the boost unit to enable it to boost the battery voltage.

[0032] The fifth threshold voltage is between the first threshold voltage and the second threshold voltage.

[0033] Optionally, the battery protection circuit is located on the same chip.

[0034] A second aspect of this application provides a battery assembly, including:

[0035] Battery;

[0036] The battery protection circuit described above is connected to the battery.

[0037] A third aspect of this application provides an electronic device, comprising:

[0038] First load, second load;

[0039] The aforementioned battery protection circuit or the aforementioned battery assembly;

[0040] The first load is connected to the battery via the first switching unit, and the second load is connected to the battery via the second switching unit.

[0041] Optionally, the second load includes a remote positioning module.

[0042] In this embodiment, when the battery voltage is between the first and second threshold voltages, the battery voltage is low, and only the second load continues to be powered, while the first load is de-powered. When the battery voltage is below the second threshold voltage, the main control unit controls both the first and second loads to stop receiving power. With this configuration, when the battery voltage is between the first and second threshold voltages, since the power consumption of the first load is much greater than that of the second load, only the second load with very low power consumption is powered by the battery, while the second load with higher power consumption is not powered. Therefore, it takes a long time for the battery voltage to drop from the first threshold voltage to the second threshold voltage, which greatly improves the standby time of the second load, facilitating location tracking, enhancing user safety, reducing parental anxiety, and improving the user experience. Furthermore, because the power consumption of the second load is very low in this voltage range, the longer time required for the battery voltage to drop to the second threshold voltage reduces the probability of the electronic device not being charged, thus minimizing overall battery damage. When the battery voltage is below the second threshold voltage, allowing the battery to continue discharging to the second load would cause significant damage to the battery; therefore, discharging the battery to the system circuit is prohibited at this time. Therefore, the design of this application can balance user experience, safety, and reduced battery damage. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0044] Figure 1a This is a circuit block diagram of the electronic device according to the first embodiment of this application;

[0045] Figure 1b This is a circuit block diagram of an electronic device according to another embodiment of this application;

[0046] Figure 2 This is a circuit block diagram of the battery protection circuit according to the first embodiment of this application;

[0047] Figure 3 This is a circuit block diagram of a battery protection circuit according to another embodiment of this application;

[0048] Figure 4 This is a detailed circuit block diagram of the battery protection circuit according to the first embodiment of this application;

[0049] Figure 5 This is a circuit block diagram of the battery protection circuit including the boost unit according to the first embodiment of this application;

[0050] Figure 6 yes Figure 5 Detailed circuit module diagram;

[0051] Figure 7 This is a circuit block diagram of the battery protection circuit according to the second embodiment of this application;

[0052] Figure 8 This is a detailed circuit block diagram of a battery protection circuit according to a second embodiment of this application;

[0053] Figure 9 This is a detailed circuit block diagram of another battery protection circuit according to the second embodiment of this application;

[0054] Figure 10a This is a circuit block diagram of the electronic device according to the third embodiment of this application;

[0055] Figure 10b This is a circuit block diagram of an electronic device according to another embodiment of this application. Detailed Implementation

[0056] 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, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0057] The terms "comprising" and "having," and any variations thereof, appearing in this application specification, claims, and drawings, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. Furthermore, the terms "first," "second," and "third," etc., are used to distinguish different objects and are not used to describe a specific order. Connections in this application include direct connections and indirect connections. An indirect connection refers to the presence of other electronic components, pins, etc., between the two connected components. The XX pin mentioned in this application may or may not be an actual pin, such as simply a pin of a component or a pin of a wire. The mention of "and / or including" in this application includes three cases, such as A and / or B, including A, B, and A and B.

[0058] First Embodiment

[0059] This application provides an electronic device, such as a smartwatch, mobile phone, tablet computer, or other consumer electronics. Please see [link to relevant documentation].Figure 1a The electronic device includes a battery 100, a battery protection circuit 200, and a system circuit 300. The system circuit 300 is electrically connected to the battery 100 via the battery protection circuit 200, and the battery 100 is used to supply power to the system circuit 300.

[0060] In this embodiment, the system circuit 300 includes a first load 310 and a second load 320. The first load 310 is the main load required for the operation of the electronic device. For example, the first load 310 includes a processor, a display module, an audio processing module, a camera processing module, a memory, etc. The second load 320 includes a remote positioning module, which includes Global Navigation Satellite System (GNSS) communication. The Global Navigation Satellite System may include at least one of the Global Positioning System (GPS), GLONASS, BeiDou, and Galileo. During normal operation, the current required by the first load 310 is much greater than that required by the second load 320, that is, the power consumption of the first load 310 is much greater than that of the second load 320. For example, during normal operation, the ratio of the power consumption of the first load 310 to the power consumption of the second load 320 is greater than or equal to 5, such as a ratio of 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 100, etc.

[0061] In this embodiment, the battery protection circuit 200 is electrically connected to the positive and negative terminals of the battery 100, the system circuit 300 is electrically connected to the battery protection circuit 200, the battery 100 supplies power to the battery protection circuit 200, and the battery protection circuit 200 protects the battery 100, for example, when the battery 100 is overcharged, over-discharged, overcharged, or over-discharged. In this embodiment, the number of batteries 100 is one or more, preferably one. When there are multiple batteries 100, they can be connected in parallel, in series, or in a combination of series and parallel connections. The battery 100 is preferably a lithium battery 100, and the capacity of the battery 100 is, for example, 1000mAh-15000mAh, such as 1000mAh, 2000mAh, 3000mAh, 4000mAh, 5000mAh, 6000mAh, 7000mAh, 8000mAh, 9000mAh, 10000mAh, 11000mAh, 12000mAh, 13000mAh, 14000mAh, 15000mAh, etc.

[0062] Please continue reading Figure 1a In this embodiment, the battery protection circuit 200 includes a power supply terminal VDD, a power ground terminal GND, a battery protection unit, a main control unit 230, a first switch unit K1, and a second switch unit K2.

[0063] In this embodiment, the power supply terminal VDD and the power ground terminal GND are used to connect to the positive and negative terminals of the battery 100, so that the battery 100 can supply power to the battery protection circuit 200. At the same time, the battery 100 forms a loop through the battery protection circuit 200 and the system circuit 300 to supply power to the system circuit 300.

[0064] In this embodiment, the first switch unit K1 is connected in series with the first load 310. The first switch unit K1 and the first load 310 are located on the first branch. One end of the first branch is connected to the positive terminal of the battery 100, and the other end of the first branch is connected to the negative terminal of the battery 100. The first switch unit K1 is used to control whether the battery 100 supplies power to the first load 310. In this embodiment, the second switch unit K2 is connected in series with the second load 320. The second switch unit K2 and the second load 320 are located on the second branch. One end of the second branch is connected to the positive terminal of the battery 100, and the other end of the second branch is connected to the negative terminal of the battery 100. The second switch unit K2 is used to control whether the battery 100 supplies power to the second load 320. The second branch is connected in parallel with the first branch.

[0065] Specifically, in this embodiment, the first terminal of the first switching unit K1 is connected to the positive terminal of the battery 100 via the third system terminal VM3, the second terminal of the first switching unit K1 is connected to the first terminal of the first load 310 via the first system terminal VM1, and the second terminal of the first load 310 is connected to the negative terminal of the battery 100. Figure 1a The first terminal of the second switching unit K2 is connected to the positive terminal of the battery 100 via the third system terminal VM3, and the second terminal of the second switching unit K2 is connected to the first terminal of the second load 320 via the second system terminal VM2. The second terminal of the second load 320 is connected to the negative terminal of the battery 100. However, this application is not limited to this. For other embodiments of this application, please refer to... Figure 1b The first terminal of the first load 310 is connected to the positive terminal of the battery 100, and the second terminal of the first load 310 is connected to the first terminal of the first switching unit K1 via the first system terminal VM1. The second terminal of the first switching unit K1 is connected to the negative terminal of the battery 100 via the third system terminal VM3. In other embodiments of this application, please refer to... Figure 1b The first end of the second load 320 is connected to the positive terminal of the battery 100, the second end of the second load 320 is connected to the first end of the second switch unit K2 via the second system terminal VM2, and the second end of the second switch unit K2 is connected to the negative terminal of the battery 100 via the third system terminal VM3. That is, the positions of the second switch unit K2 and the second load 320 are swapped.

[0066] Please continue reading Figure 1aIn this embodiment, the control terminals of the first switch unit K1 and the second switch unit K2 are both connected to the main control unit 230. The main control unit 230 is used to control the first switch unit K1 to turn on or off, and the main control unit 230 is used to control the second switch unit K2 to turn on or off. In this embodiment, when the first switch unit K1 is on, the battery 100 supplies power to the first load 310, and the first load 310 operates. When the first switch unit K1 is off, the battery 100 stops supplying power to the first load 310, and the first load 310 does not operate. When the second switch unit K2 is on, the battery 100 supplies power to the second load 320, and the second load 320 operates. When the second switch unit K2 is off, the battery 100 stops supplying power to the second load 320, and the second load 320 does not operate.

[0067] To prevent damage to battery 100 due to excessively low battery voltage, the battery protection circuit 200 in this embodiment incorporates over-discharge protection. The battery protection unit includes an over-discharge protection module 400, whose input is connected to the battery voltage (the current voltage of battery 100), and whose output is connected to the main control unit 230. In this embodiment, the over-discharge protection module 400 compares the battery voltage with a threshold voltage to determine if the battery voltage is too low. Specifically, the over-discharge protection module 400 compares the battery voltage with preset first and second threshold voltages for subsequent processing, wherein the first threshold voltage is greater than the second threshold voltage. In this embodiment, for ease of description, the magnitudes of the first and second threshold voltages are relative to the battery voltage.

[0068] In this embodiment, when the over-discharge protection module 400 determines that the battery voltage is greater than or equal to the first threshold voltage, the over-discharge protection module 400 outputs a normal discharge signal to the main control unit 230. The main control unit 230 controls the first switch unit K1 and the second switch unit K2 to be normally turned on, so that the battery 100 normally supplies power to the first load 310 and the second load 320. When the over-discharge protection module 400 determines that the battery voltage is less than the first threshold voltage, the over-discharge protection module 400 determines that the battery voltage is low and measures need to be taken. At this time, the over-discharge protection module 400 outputs a first over-discharge signal to the main control unit 230, and the main control unit 230 controls the first switch unit K1 to be turned off. At this time, the battery 100 does not supply power to the first load 310, which is the normal over-discharge protection.

[0069] To ensure the positioning of electronic devices even when the battery voltage is low, and to protect the battery 100, in this embodiment, when the over-discharge protection module 400 determines that the battery voltage is less than the first threshold voltage but greater than or equal to the second threshold voltage, the over-discharge protection module 400 outputs a first over-discharge protection signal to the main control unit 230. The main control unit 230 also controls the second switch unit K2 to remain on and conducting (normally on). At this time, the battery 100 normally supplies power to the second load 320. When the over-discharge protection module 400 determines that the battery voltage is less than the second threshold voltage, it determines that the battery voltage is very low and further measures are needed. At this time, the over-discharge protection module outputs a second over-discharge protection signal to the main control unit 230. The main control unit 230 controls both the first switch unit K1 and the second switch unit K2 to be off (normally off). At this time, the battery 100 does not supply power to the first load 310 and the second load 320. In this embodiment, the second threshold voltage is less than the first threshold voltage. For example, the first threshold voltage is 2.9V, 3V, 3.1V, etc., and the second threshold voltage is 2V, 2.1V, 2.2V, etc.

[0070] In this embodiment, when the battery voltage is between the first threshold voltage and the second threshold voltage, only the second load 320 continues to be powered, while the first load 310 is de-powered. When the battery voltage is less than the second threshold voltage, the main control unit 230 controls both the first load 310 and the second load 320 to be de-powered. With this configuration, when the battery voltage is between the first and second threshold voltages, since the power consumption of the first load 310 is much greater than that of the second load 320, only the second load 320, which consumes very little power, is powered by the battery 100. The second load 320, which consumes more power, is not powered by the battery 100. Therefore, it takes a long time for the battery voltage to drop from the first threshold voltage to the second threshold voltage, which is of great concern to users. This significantly improves the standby time of the second load 320, enhancing user safety, especially for parents to locate their children using electronic devices, and improving the user experience. Furthermore, within this voltage range, because the power consumption of the second load 320 is very small, the time required for the battery voltage to drop to the second threshold voltage is relatively long. Therefore, the probability of the electronic device not being charged within this range is low, resulting in less overall damage to the battery 100. When the battery voltage is lower than the second threshold voltage, allowing the battery 100 to continue discharging to the second load 320 would cause greater damage to the battery 100. Therefore, discharging the battery 100 to the system circuit 300 is prohibited at this time. Thus, through the design of this application, user experience, safety, and reduced damage to the battery 100 can be balanced.

[0071] In the actual design of the battery protection circuit 200, the battery voltage is generally not obtained directly. In actual design, the comparison between the battery voltage and the threshold voltage is generally carried out using the following two methods, which are described below:

[0072] 1. Please see Figure 2 (This embodiment is described using this as an example.) The battery protection circuit 200 includes a battery voltage sampling unit 210. One end of the battery voltage sampling unit 210 is connected to the power supply terminal VDD, and the other end is connected to the power ground terminal GND. With this configuration, a first sampling voltage can be detected. The first sampling voltage characterizes the battery voltage; that is, the first sampling voltage corresponds to the battery voltage, and the two are positively linearly correlated. Specifically, the battery voltage sampling unit 210 includes a first resistor R1 and a second resistor R2, which are connected in series. The first resistor R1 is connected to the power supply terminal VDD, and the second resistor R2 is connected to the power ground terminal GND. The voltage at the point where the second resistor R2 is connected to the first resistor R1 is the first sampling voltage, which is then transmitted to the over-discharge protection module 400. Only one sampling voltage needs to be designed here, making the sampling implementation simple and straightforward.

[0073] Here, the over-discharge protection module 400 includes a first over-discharge protection unit 410 and a second over-discharge protection unit 420. The input terminals of the first over-discharge protection unit 410 are respectively connected to a first sampling voltage and a preset first reference voltage Vref1, and its output terminal is connected to the main control unit 230. The input terminals of the second over-discharge protection unit 420 are respectively connected to the first sampling voltage and a preset second reference voltage Vref2, and its output terminal is connected to the main control unit 230. The first reference voltage Vref1 corresponds to a first threshold voltage, and the second reference voltage Vref2 corresponds to a second threshold voltage. The first reference voltage Vref1 is greater than the second reference voltage Vref2. In this embodiment, the first over-discharge protection unit 410 includes a first voltage comparator, and the second over-discharge protection unit 420 includes a second voltage comparator. When the first sampling voltage is greater than or equal to the first reference voltage Vref1, both the first over-discharge protection unit 410 and the second over-discharge protection unit 420 output normal signals to the main control unit 230, meaning the two normal signals constitute a normal discharge signal. When the first sampling voltage is less than the first reference voltage Vref1 and greater than or equal to the second reference voltage Vref2, the first over-discharge protection unit 410 outputs an over-discharge signal to the main control unit 230, and the second over-discharge protection unit 420 outputs a normal signal to the main control unit 230, meaning the over-discharge signal output by the first over-discharge protection unit 410 and the normal signal output by the second over-discharge protection unit 420 together constitute the first over-discharge protection signal. When the first sampling voltage is less than the second reference voltage Vref2, both the first over-discharge protection unit 410 and the second over-discharge protection unit 420 output over-discharge signals to the main control unit 230, meaning the over-discharge signal output by the first over-discharge protection unit 410 and the over-discharge signal output by the second over-discharge protection unit 420 together constitute the second over-discharge protection signal.

[0074] 2. Please see Figure 3The battery protection circuit 200 includes a battery voltage sampling unit 210. One end of the battery voltage sampling unit 210 is connected to the power supply terminal VDD, and the other end is connected to the power supply ground terminal GND. This configuration allows for the detection of a first sampling voltage and a second sampling voltage. These two voltages characterize the same battery voltage; that is, both the first and second sampling voltages correspond to the battery voltage and are positively linearly correlated with it. Specifically, the battery voltage sampling unit 210 includes a first resistor R1, a second resistor R2, and a third resistor R3, connected in series. The first resistor R1 is connected to the power supply ground terminal GND, and the third resistor R3 is connected to the power supply terminal VDD. The voltage at the point where the second resistor R2 is connected to the first resistor R1 is the first sampling voltage, and the voltage at the point where the third resistor R3 is connected to the second resistor R2 is the second sampling voltage. Both the first and second sampling voltages are transmitted to the over-discharge protection module 400. Here, for the same battery voltage, the second sampling voltage is greater than the first sampling voltage.

[0075] Here, the over-discharge protection module 400 includes a first over-discharge protection unit 410 and a second over-discharge protection unit 420. The input terminals of the first over-discharge protection unit 410 are respectively connected to a first sampling voltage and a preset first reference voltage Vref1, and its output terminal is connected to the main control unit 230. The input terminals of the second over-discharge protection unit 420 are respectively connected to a second sampling voltage and the first reference voltage Vref1, and its output terminal is connected to the main control unit 230. The comparison between the first sampling voltage and the first reference voltage Vref1 corresponds to the comparison between the battery voltage and a first threshold voltage, and the comparison between the second sampling voltage and the first reference voltage Vref1 corresponds to the comparison between the battery voltage and a second threshold voltage. In this embodiment, the first over-discharge protection unit 410 includes a first voltage comparator, and the second over-discharge protection unit 420 includes a second voltage comparator. When the first sampling voltage is greater than or equal to the first reference voltage Vref1, both the first over-discharge protection unit 410 and the second over-discharge protection unit 420 output normal signals to the main control unit 230, meaning the two normal signals constitute a normal discharge signal. When the first sampling voltage is less than the first reference voltage Vref1 and the second reference voltage Vref2 is greater than or equal to the first reference voltage Vref1, the first over-discharge protection unit 410 outputs an over-discharge signal to the main control unit 230, and the second over-discharge protection unit 420 outputs a normal signal to the main control unit 230, meaning the over-discharge signal output by the first over-discharge protection unit 410 and the normal signal output by the second over-discharge protection unit 420 together constitute the first over-discharge protection signal. When the second sampling voltage is less than the first reference voltage Vref1, both the first over-discharge protection unit 410 and the second over-discharge protection unit 420 output over-discharge signals to the main control unit 230, meaning the over-discharge signal output by the first over-discharge protection unit 410 and the over-discharge signal output by the second over-discharge protection unit 420 together constitute the second over-discharge protection signal. Only a reference voltage needs to be designed here, and the design of the reference voltage is relatively simple.

[0076] In addition, in other embodiments of this application, a first sampling voltage, a second sampling voltage, a first reference voltage Vref1, and a second reference voltage Vref2 can be designed. The first sampling voltage is compared with the first reference voltage Vref1, which corresponds to the comparison between the battery voltage and the first threshold voltage. The second sampling voltage is compared with the second reference voltage Vref2, which corresponds to the comparison between the battery voltage and the second threshold voltage. The principle of comparison is similar to that described in 1 and 2 above, which is easy for those skilled in the art to understand, and will not be repeated here.

[0077] Please continue to refer to the above. Figure 1a , Figure 2 and Figure 4This embodiment also provides discharge overcurrent protection. Specifically, the battery protection circuit 200 further includes an overcurrent protection module 220. The overcurrent protection module 220 is used for conventional discharge overcurrent protection. The first input terminal of the overcurrent protection module 220 is connected to a third sampling voltage, its second input terminal is connected to a preset third current threshold Vref3, and its output terminal is connected to the main control unit 230. In this embodiment, the third sampling voltage is used to characterize the current flowing through the system circuit 300, that is, to characterize the sum of the currents flowing through the first load 310 and the second load 320. The third current threshold Vref3 is used for conventional overcurrent protection. When both the first load 310 and the second load 320 are working normally, it is appropriate to use the third current threshold Vref3 to determine whether there is an overcurrent. However, when the battery voltage is between the first threshold voltage and the second threshold voltage, the first load 310 no longer works, while the second load 320 continues to work. If the third current threshold Vref3 is still used, since the third current threshold Vref3 itself is relatively large, The second load 320 itself has a relatively small current. Even if the second load 320 itself malfunctions, the current it carries will still be relatively small, potentially lower than the third current threshold Vref3. This means the third current threshold Vref3 of the overcurrent protection module 220 is no longer applicable when the second load 320 is operating alone. To improve this, in this embodiment, the second input terminal of the overcurrent protection module 220 is also connected to a fourth current threshold Vref4. At any given time, only the third current threshold Vref3 or the fourth current threshold Vref4 is connected to the second input terminal, where the third current threshold Vref3 is greater than the fourth current threshold Vref4. In this embodiment, the overcurrent protection module 220 includes a third voltage comparator and a third delay unit.

[0078] Specifically, when both the first switching unit K1 and the second switching unit K2 are normally turned on, and both the first load 310 and the second load 320 are working normally, the second input terminal of the overcurrent protection module 220 is connected to the third current threshold Vref3. When the first switching unit K1 is turned off and the second switching unit K2 is turned on, the second input terminal of the overcurrent protection module 220 is connected to the fourth current threshold Vref4. With this setting, when both the first load 310 and the second load 320 are working, a larger third current threshold Vref3 is used; when only the second load 320 is working, a smaller fourth current threshold Vref4 is used. This setting allows for a more accurate determination of whether the system circuit 300 is experiencing overcurrent, thus improving the aforementioned problem.

[0079] To achieve the switching between the third current threshold Vref3 and the fourth current threshold Vref4, in this embodiment, the battery protection circuit 200 further includes a third switching unit K3 and a fourth switching unit K4. The first terminal of the third switching unit K3 is connected to the third current threshold Vref3, and the second terminal of the third switching unit K3 is connected to the second input terminal of the overcurrent protection module 220. The first terminal of the fourth switching unit K4 is connected to the fourth current threshold Vref4, and the second terminal of the fourth switching unit K4 is connected to the second input terminal of the overcurrent protection module 220. The control terminals of the third switching unit K3 and the fourth switching unit K4 are both connected to the main control unit 230, and the main control unit 230 controls the opening and closing of the third switching unit K3 and the fourth switching unit K4. By default, the main control unit 230 controls the third switch unit K3 to turn on and the fourth switch unit K4 to turn off. At this time, the second input terminal of the overcurrent protection module 220 is connected to the third current threshold Vref3. When the battery voltage is between the first and second threshold voltages, i.e., when the main control unit 230 receives the first over-discharge protection signal, the main control unit 230 controls the third switch unit K3 to turn off and the fourth switch unit K4 to turn on. At this time, the second input terminal of the overcurrent protection module 220 is connected to the fourth current threshold Vref4. When the main control unit 230 receives the second over-discharge protection signal, since the main control unit 230 controls both the first and second switch units K1 and K2 to turn off, the current flowing through the system circuit 300 is 0, and the third sampling voltage is 0. Therefore, the main control unit 230 can control either the third switch unit K3 or the fourth switch unit K4 to turn on. In this embodiment, the third switch unit K3 and the fourth switch unit K4 can be MOSFETs, transistors, etc.

[0080] To obtain the third sampling voltage, please continue to see... Figure 1a and Figure 4 In this embodiment, the battery protection circuit 200 further includes a fourth resistor R4, wherein the fourth resistor R4 is connected in series with the circuit formed by the parallel connection of the second branch and the first branch. Figure 1a In this embodiment, the first terminal of the fourth resistor R4 is connected to the positive terminal of the battery 100, and the second terminal of the fourth resistor R4 is connected to both the first branch and the second branch, so that the current flowing through the fourth resistor R4 is the sum of the current in the first branch and the current in the second branch. Additionally, for other embodiments of this application, please refer to... Figure 1bThe first terminal of the fourth resistor R4 is connected to the negative terminal of the battery 100, and the second terminal of the fourth resistor R4 is connected to the first branch and the second branch respectively, so that the current flowing through the fourth resistor R4 is the sum of the current in the first branch and the current in the second branch. In this embodiment, the third sampling voltage is the voltage across the fourth resistor R4. As to how the third sampling voltage is obtained, it is a conventional technique in the art and will not be described in detail here.

[0081] Generally speaking, as the battery voltage decreases, the second load 320 may become unusable because it requires a certain voltage to operate. To improve this issue, please refer to [reference needed]. Figure 1a and Figure 5 In this embodiment, the battery protection circuit 200 further includes a boost unit 240. One end of the boost unit 240 is connected to the positive terminal of the battery 100 via the second switching unit K2, and the other end of the boost unit 240 is connected to one end of the second load 320. The other end of the second load 320 is connected to the negative terminal of the battery 100. With this configuration, when the battery voltage is low, the boost unit 240 boosts the voltage, increasing the voltage output to the second load 320, thereby enabling the second load 320 to operate normally. In this embodiment, the boost unit 240 is, for example, a charge pump. Figure 6 (This will be used as an example for illustration), boost voltage, etc., which will not be elaborated on here.

[0082] To save power, please refer to [link / reference]. Figure 1a , Figure 5 and Figure 6In this embodiment, the boost unit 240 is not always operational. To achieve this, the battery protection circuit 200 further includes a voltage judgment unit 250. The first input terminal of the voltage judgment unit 250 is used to input the battery voltage, its second input terminal is used to input a preset fifth threshold voltage, and its output terminal is connected to the main control unit 230. The main control unit 230 is also connected to the enable terminal of the boost unit 240. When the battery voltage is greater than or equal to the fifth threshold voltage, the main control unit 230 controls the boost unit 240 to enable. At this time, the boost unit 240 does not boost the battery voltage; the battery voltage is directly supplied to the second load 320, which can then function normally. When the battery voltage is less than the fifth threshold voltage, the main control unit 230 controls the boost unit 240 to enable, thereby boosting the battery voltage before supplying it to the second load 320. In this embodiment, the boost voltage boosted by the boost unit 240 is, for example, 1.5 times, 2 times, 2.5 times, or 3 times the battery voltage. This embodiment combines the voltage judgment unit 250 with the boost unit 240, which improves the flexibility of the boost unit 240 and further saves power consumption. In this embodiment, the fifth threshold voltage is located between the first threshold voltage and the second threshold voltage, for example, the fifth threshold voltage is 2.5V, 2.4V, etc. In this embodiment, the voltage judgment unit 250 includes a voltage comparator. In this embodiment, the boost unit 240 is located inside the battery protection circuit 200, and the control of the boost unit 240 is relatively flexible. To compare the battery voltage with the fifth threshold voltage, the figure shows a design that compares the first sampling voltage with the fifth reference voltage Vref5.

[0083] Figure 6 The diagram illustrates a detailed view of a charge pump boost unit 240. In the diagram, the boost unit 240 includes a fifth switch K5, a sixth switch K6, a seventh switch K7, and a first capacitor C1. The specific connections of these components are shown in the diagram and will not be described further here. In this embodiment, when the main control unit 230 enables the boost unit 240, it keeps the fifth switch K5 and the seventh switch K7 on and closed, while keeping the sixth switch K6 off. When the main control unit 230 enables the boost unit 240, it controls the boost unit 240 at certain intervals. One interval includes a first time period and a second time period. During the first time period, it controls the fifth switch K5 and the seventh switch K7 on and closes, while controlling the sixth switch K6 off. During the second time period, it controls both the fifth switch K5 and the seventh switch K7 off and controls the sixth switch K6 on, thus achieving voltage boost. The specific boost principle is conventional technology in the field and will not be elaborated further here.

[0084] Please refer to the above. Figures 1a-6In this embodiment, one end of the first switching unit K1 is connected to the positive terminal of the battery 100. Figure 1a ) or negative electrode ( Figure 1b The first switching unit K1 is connected to the first load 310 via the first system terminal VM1. The control terminal of the first switching unit K1 is connected to the main control unit 230. The main control unit 230 controls the first switching unit K1 to turn on or off, thereby controlling the battery 100 to supply power to or stop supplying power to the first load 310. In this embodiment, the first switching unit K1 includes a charging switch K11 and a discharging switch K12, which are connected in series. Both the charging switch K11 and the discharging switch K12 are MOSFETs or transistors, etc. The control terminals of the charging switch K11 and the discharging switch K12 are electrically connected to the main control unit 230, so that the main control unit 230 can control the charging switch K11 and the discharging switch K12 to turn on or off, respectively. When the main control unit controls the battery to stop supplying power to the system circuit, the main control unit controls the discharging switch K12 to turn off. However, this application is not limited to this. In other embodiments of this application, the first switching unit K1 includes a first switching transistor, and the battery protection circuit 200 includes a substrate switching control unit. The first switching transistor is a MOSFET, and its control terminal is electrically connected to the main control unit 230. The substrate switching control unit is also electrically connected to the main control unit 230. The substrate switching control unit is used to correctly bias the substrate of the first switching transistor. Furthermore, in other embodiments of this application, the first switching unit K1 can also be implemented in other ways, such as including only one switching transistor. In this embodiment, the first switching unit K1 is used to control the battery 100 to supply power to the first load 310. Specifically, a circuit is formed between the battery 100, the first switching unit K1 of the battery protection circuit 200, and the first load 310 to supply power to the first load 310.

[0085] In this embodiment, the second switching unit K2 is, for example, a MOSFET or a transistor, specifically a PMOS transistor in the illustration. However, this application is not limited to this. In other embodiments of this application, the second switching unit K2 can also be a transistor, an IGBT, etc., and this application does not impose any restrictions on this. In this embodiment, during normal operation, the current flowing through the second switching unit K2 is less than the current flowing through the first switching unit K1. Therefore, the number of parallel transistor cells included in the second switching unit K2 is less than the number of parallel transistor cells included in the first switching unit K1. By setting it in this way, the cost of the battery protection circuit 200 can be reduced.

[0086] In this embodiment, the battery protection circuit 200 is located on the same integrated circuit chip. In other embodiments of this application, the battery protection circuit 200, except for the first switching unit K1, is located on the first integrated circuit chip, and the first switching unit K1 is located on the second integrated circuit chip; the two chips are packaged together.

[0087] In this embodiment, when the battery voltage is between the first threshold voltage and the second threshold voltage, the main control unit 230 controls the first switch unit K1 to open and close, and controls the second switch unit K2 to remain on. This can improve the standby time of the second load 320. However, further improving the standby time of the second load 320 is a continuous effort. In order to further improve the standby time of the second load 320 and improve the user experience, this application provides a second embodiment.

[0088] Second Embodiment

[0089] Please see Figure 7 , Figure 7 This is a partial circuit block diagram of the battery protection circuit 200 of the second embodiment of this application. This embodiment is similar to the first embodiment. Therefore, the parts not described in this embodiment can be referred to the first embodiment. The main difference between this embodiment and the first embodiment is that the second switch unit K2 is not always on.

[0090] Please refer to the following: Figure 1a and Figure 7 In this embodiment, when the battery voltage is between the first threshold voltage and the second threshold voltage, the main control unit 230 controls the second switching unit K2 not to be continuously turned on. In this embodiment, the main control unit 230 controls the second switching unit K2 to be turned on intermittently. For example, the main control unit 230 controls the second switching unit K2 through PWM (Pulse Width Modulation, which is used as an example in this embodiment) or PFM (Pulse Frequency Modulation). The intermittent turn-on includes a turn-on time and a turn-off time. During the turn-on time, the main control unit 230 controls the second switching unit K2 to turn on, and during the turn-off time, the main control unit 230 controls the second switching unit K2 to turn off. By setting it this way, the power consumption of the second load 320 can be further reduced, and the standby time of the battery 100 when the first sampling voltage is between the first reference voltage Vref1 and the second reference voltage Vref2 can be increased.

[0091] To further reduce power consumption, extend standby time, and minimize damage to the battery 100, in this embodiment, the duty cycle of the second switching unit K2 decreases progressively as the battery voltage decreases, for example, from 90% to 30%. For details, please refer to [reference needed]. Figure 1a , Figure 7 and Figure 8In this embodiment, the second over-discharge protection unit 420 includes n over-discharge protection sub-units, where n is an integer greater than or equal to 2. The n over-discharge protection sub-units are the second first over-discharge protection sub-unit 421, the second second over-discharge protection sub-unit 422, ..., the second nth over-discharge protection sub-unit 42n. Correspondingly, n reference sub-voltages are also set, which are the second first reference sub-voltage Vref21, the second second reference sub-voltage Vref22, ..., the second nth reference sub-voltage Vref2n, where the second first reference sub-voltage Vref21 > the second second reference sub-voltage Vref22 > ... > the second nth reference sub-voltage Vref2n, and the second nth reference sub-voltage Vref2n is the second reference voltage Vref2. In this embodiment, the first input terminal of the second first over-discharge protection sub-unit 421 and the first input terminal of the second second over-discharge protection sub-unit 422 are...

[0092] The first input terminals of the second n over-discharge protection subunit 42n are all connected to the first sampling voltage. The second input terminal of the second first over-discharge protection subunit 421 is connected to the second first reference sub-voltage Vref21. The second input terminal of the second second over-discharge protection subunit 422 is connected to the second second reference sub-voltage Vref22. ... The second input terminal of the second n over-discharge protection subunit 42n is connected to the second n reference sub-voltage Vref2n. Thus, the first reference voltage Vref1 and the second reference voltage Vref2 are divided into n segments by n over-discharge protection subunits and n reference sub-voltages. The n segments correspond to different duty cycles, and the duty cycle decreases as the first sampling voltage decreases. Correspondingly, the n duty cycles are D1, D2, ..., Dn, and D1 ≥ D2 ≥ ... ≥ Dn, and D1 > ... ≥ Dn.

[0093] Dn.

[0094] In this embodiment, when the first sampling voltage is less than the first reference voltage Vref1 and greater than or equal to the second first reference sub-voltage Vref21, the first over-discharge protection unit 410 outputs an over-discharge signal to the main control unit 230, and the second first over-discharge protection sub-unit 421 to the second nth over-discharge protection sub-unit 42n all output normal signals to the main control unit 230. At this time, the main control unit 230 receives the first over-discharge protection signal and controls the duty cycle of the second switching unit K2 to D1; when the first sampling voltage is less than the second first reference sub-voltage Vref21 and greater than or equal to the second second reference sub-voltage Vref22, the first over-discharge protection... Unit 410 and the second over-discharge protection subunit 421 both output over-discharge signals to the main control unit 230, while other over-discharge protection subunits output normal signals to the main control unit 230. At this time, the main control unit 230 receives the first and second over-discharge protection signals and controls the duty cycle of the second switching unit K2 to D2;...; When the first sampling voltage is less than the second (n-2) reference sub-voltage and greater than or equal to the second (n-1) reference sub-voltage, the first over-discharge protection unit 410, the second over-discharge protection subunit 421, the second over-discharge protection subunit 422,..., and the second (n-2) over-discharge protection subunit all output over-discharge signals. The first over-discharge protection subunit 421, the second over-discharge protection subunit 422, ..., the second (n-1) over-discharge protection subunit 42n all output normal signals to the main control unit 230. At this time, the main control unit 230 receives the first (n-1) over-discharge protection signal and controls the duty cycle of the second switching unit K2 to D(n-1). When the first sampling voltage is less than the second (n-1) reference sub-voltage and greater than or equal to the second n reference sub-voltage Vref2n, the second first over-discharge protection subunit 421, the second second over-discharge protection subunit 422, ..., the second (n-1) over-discharge protection subunit all output over-discharge signals to the main control unit 230. The second n over-discharge protection subunit 42n outputs a normal signal to the main control unit 230. At this time, the main control unit 230 receives the first n over-discharge protection signal and controls the duty cycle of the second switching unit K2 to Dn. When the first sampling voltage is less than the second n reference voltage Vref2n, the first over-discharge protection unit 410, the second first over-discharge protection subunit 421, the second second over-discharge protection subunit 422, ..., the second n over-discharge protection subunit 42n all output over-discharge signals to the main control unit 230. At this time, the main control unit 230 receives the second over-discharge protection signal and controls the second switching unit K2 to open and cut off.

[0095] Preferably, the duty cycle of the second switching unit K2 is D1 > D2 > ... > Dn. This setting further reduces power consumption, increases the standby time of the second load 320, reduces damage to the battery 100, and facilitates positioning when needed. However, this application is not limited to this. In other embodiments of this application, D1 ≥ D2 ≥ ... ≥ Dk > D(k+1) ≥ ... ≥ Dn, where k is an integer greater than 1 and less than n, and D1 > Dn. Furthermore, in other embodiments of this application, when the first sampling voltage is less than the first reference voltage Vref1 and greater than or equal to the second reference voltage Vref2, the main control unit 230 controls the duty cycle of the second switching unit K2 to remain constant, not changing with battery voltage variations. For example, the duty cycle can be 90%, 85%, 80%, 70%, 60%, 50%, 40%, 30%, etc.

[0096] Additionally, in other embodiments of this application, please refer to [reference needed]. Figure 1a , Figure 7 and Figure 9 The second over-discharge protection unit 420 includes n over-discharge protection sub-units, where n is an integer greater than or equal to 2. The n over-discharge protection sub-units are the second first over-discharge protection sub-unit 421, the second second over-discharge protection sub-unit 422, ..., the second nth over-discharge protection sub-unit 42n. Correspondingly, the third resistor R3 of the battery voltage sampling unit 210 includes a third first sub-resistor R31, a third second sub-resistor R32, ..., a third nth sub-resistor R3n. The first resistor R1, the second resistor R2, the third first sub-resistor R31, the third second sub-resistor R32, ..., the third nth sub-resistor R3n are connected in series. One end of the first resistor R1 is connected to the power ground terminal GND, and one end of the third nth sub-resistor R3n is connected to the power supply terminal VDD. The voltage at the lower end of the second resistor R2 is the first sampling voltage, the voltage at the lower end of the third first sub-resistor R31 is the second first sampling voltage, and the voltage at the lower end of the third second sub-resistor R32 is the second second sampling voltage.

[0097] The voltage at the lower end of the third n-sub-resistor R3n is the second n-sample sub-voltage. For the same battery voltage, the first sample voltage < the second first sample voltage < the second second sample voltage < ... < the second n-sample voltage. The second first sample voltage is sent to the second first over-discharge protection sub-unit 421, the second second sample voltage is sent to the second second over-discharge protection sub-unit 422, ..., the second n-sample voltage is sent to the second n-over-discharge protection sub-unit 42n. Here, all over-discharge protection sub-units share the same reference voltage, namely the first reference voltage Vref1, which helps to reduce complexity.

[0098] Here, when the first reference voltage Vref1 is greater than the first sampling sub-voltage and less than or equal to the second sampling sub-voltage, the main control unit 230 controls the duty cycle of the second switching unit K2 to be D1; when the first reference voltage Vref1 is greater than the second sampling sub-voltage and less than or equal to the second sampling sub-voltage, the main control unit 230 controls the duty cycle of the second switching unit K2 to be D2, ..., when the first reference voltage Vref1 is greater than the second (n-2) sampling sub-voltage and less than or equal to the second (n-1) sampling sub-voltage, the main control unit 230 controls the duty cycle of the second switching unit K2 to be D(n-1); when the first reference voltage Vref1 is greater than the second (n-1) sampling sub-voltage and less than or equal to the nth sampling sub-voltage, the main control unit 230 controls the duty cycle of the second switching unit K2 to be Dn; when the first reference voltage Vref1 is greater than the nth sampling sub-voltage, the main control unit 230 controls the second switching unit K2 to be normally open. Thus, the first threshold voltage and the second threshold voltage are divided into n segments by n over-discharge protection sub-units and n sampling sub-voltages. The n segments correspond to different duty cycles, and the duty cycle becomes smaller and smaller as the battery voltage decreases. Correspondingly, the n duty cycles satisfy 1>D1≥D2≥...≥Dn>0, and D1>Dn. Preferably, 1>D1>D2>...>Dn>0.

[0099] Please continue to refer to the above. Figure 1a and Figure 8 In this embodiment, the third delay unit has a preset third delay duration. When the overcurrent protection module 220 determines that the signal at the first input terminal is greater than or equal to the signal at its second input terminal and continues for the third delay duration, the overcurrent protection module 220 outputs an overcurrent protection signal to the main control unit 230. The main control unit 230 then controls the battery 100 to stop supplying power to the first load 310 and the second load 320. During the overcurrent protection determination process, when the signal at the first input terminal is less than the signal at the second input terminal, the timer of the third delay unit will be reset to zero. When the signal at the first input terminal is greater than or equal to the signal at the second input terminal again, the third delay duration will start counting from 0.

[0100] In this embodiment, the third delay duration is fixed. However, when the battery voltage is between the first threshold voltage and the second threshold voltage, as the battery voltage decreases, the main control unit 230 controls the duty cycle of the second switching unit K2 to decrease step by step, that is, the duty cycle becomes lower and lower. As a result, the conduction time of the second switching unit K2 within one cycle becomes shorter and shorter. This presents a problem: the conduction time of the second switching unit K2 may be less than the third delay duration. This means that even if an overcurrent fault occurs in the system circuit 300, the duration for which the third sampled voltage is greater than or equal to the fourth current threshold Vref4 will not exceed the third delay duration. Consequently, the overcurrent protection module 220 may never output an overcurrent protection signal to the main control unit 230, causing the overcurrent protection to fail. To improve this problem, in this embodiment, the third delay duration decreases step by step as the duty cycle of the second switching unit K2 decreases. By setting it in this way, it can be ensured that the conduction time of the second switching unit K2 within one cycle is greater than the corrected third delay duration.

[0101] To achieve a gradual decrease in the third delay duration as the duty cycle of the second switching unit K2 decreases, in this embodiment, the third delay unit is connected to the main control unit 230. When the main control unit 230 controls the duty cycle of the second switching unit K2 to be D1, D2, ..., Dn, the third delay duration of the third delay unit is corrected to: third delay duration * corresponding duty cycle. That is, when the duty cycle of the second switching unit K2 is controlled to be D1, the delay duration of the third delay unit is corrected to: third delay duration * D1; when the duty cycle of the second switching unit K2 is controlled to be D2, the delay duration of the delay unit is corrected to: third delay duration * D2; ...; when the duty cycle of the second switching unit K2 is controlled to be Dn, the delay duration of the delay unit is corrected to: third delay duration * Dn. This application is not limited to this. In other embodiments of this application, the third delay unit is connected to the main control unit 230. When the main control unit 230 controls the duty cycle of the second switch unit K2 to D1, D2, ..., Dn, the third delay duration of the third delay unit is modified to: third delay duration - j * fixed duration, where j is the subscript of D1, D2, ..., Dn, that is, j is one of 1, 2, 3, ..., n, and the fixed duration is preset, that is, when the duty cycle of the second switch unit K2 is controlled to be... When the duty cycle of the second switching unit K2 is D1, the delay duration of the third delay unit is corrected to: third delay duration - 1 * fixed duration; when the duty cycle of the second switching unit K2 is D2, the delay duration of the third delay unit is corrected to: third delay duration - 2 * fixed duration; ...; when the duty cycle of the second switching unit K2 is Dn, the delay duration of the third delay unit is corrected to: third delay duration - n * fixed duration. This setting ensures that the conduction duration of the second switching unit K2 is greater than the delay duration within one cycle. Furthermore, those skilled in the art can also achieve a gradual decrease in the third delay duration as the duty cycle of the second switching unit K2 decreases step by step in other ways; this embodiment will not provide examples of each such method.

[0102] In this embodiment, as the battery voltage decreases step by step, the duty cycle of the second switching unit K2 decreases step by step. In this case, when the first sampling voltage is synchronously less than the fifth reference voltage Vref5, the boost unit 240 is only enabled when the second switching unit K2 is turned on (on time). When the second switching unit K2 is turned off (off time), the boost unit 240 is enabled. That is, the boost unit 240 needs to match whether the second switching unit K2 is turned on or off, which can accurately control the boosting and further reduce the power consumption of the boost unit 240. There will be no situation where the second switching unit K2 is turned off but the boost unit 240 is enabled, which can further reduce power consumption.

[0103] Third Embodiment

[0104] Please see Figure 10a , Figure 10a This is a partial circuit module diagram of an electronic device according to the third embodiment of this application. This embodiment is similar to the first and second embodiments. Therefore, the parts not described in this embodiment can be referred to the first and second embodiments. The main difference between this embodiment and the first and second embodiments is the connection method of the first switch unit K1 and the second switch unit K2.

[0105] Please see Figure 10a In this embodiment, the first switch unit K1 is connected in series with the first load 310. The first switch unit K1 and the first load 310 are located on the first branch. One end of the first branch is connected to the positive terminal of the battery 100 via the second switch unit K2, and the other end of the first branch is connected to the negative terminal of the battery 100. The first switch unit K1 is used to control whether the battery 100 supplies power to the first load 310. In this embodiment, the second load 320 is located on the second branch. One end of the second branch is connected to the positive terminal of the battery 100 via the second switch unit K2, and the other end of the second branch is connected to the negative terminal of the battery 100. The second branch and the first branch are connected in parallel. The circuit formed after parallel connection is connected in series with the second switch unit K2. Therefore, when the second switch unit K2 is turned off, neither the first branch nor the second branch is supplied with power by the battery 100. When the second switch unit K2 is turned on, the second load 320 is supplied with power by the battery 100. Whether the first load 310 is supplied with power is controlled by the first switch unit K1.

[0106] In this embodiment, the first terminal of the first switching unit K1 is connected to the positive terminal of the battery 100 via the second switching unit K2, the second terminal of the first switching unit K1 is connected to the first terminal of the first load 310, and the second terminal of the first load 310 is connected to the negative terminal of the battery 100. The first terminal of the second load 320 is connected to the positive terminal of the battery 100 via the second switching unit K2, and the second terminal of the second load 320 is connected to the negative terminal of the battery 100. However, this application is not limited to this; please refer to other embodiments of this application. Figure 10b The first end of the first load 310 is connected to the positive terminal of the battery 100, the second end of the first load 310 is connected to the first end of the first switching unit K1, the second end of the first switching unit K1 is connected to the negative terminal of the battery 100 via the second switching unit K2, the first end of the second load 320 is connected to the positive terminal of the battery 100, and the second end of the second load 320 is connected to the negative terminal of the battery 100 via the second switching unit K2. That is, the second load 320 is connected in parallel with the first branch.

[0107] Please continue reading Figure 10aIn this embodiment, the control terminals of the first switch unit K1 and the second switch unit K2 are both connected to the main control unit 230. The main control unit 230 is used to control the first switch unit K1 to turn on or off, and the main control unit 230 is used to control the second switch unit K2 to turn on or off.

[0108] In this embodiment, when the battery voltage is greater than or equal to the first threshold voltage, the main control unit 230 controls both the first switch unit K1 and the second switch unit K2 to be normally turned on, and the battery 100 supplies power to both the first load 310 and the second load 320. When the battery voltage is less than the first threshold voltage but greater than or equal to the second threshold voltage, the main control unit 230 controls the first switch unit K1 to be turned off, and controls the second switch unit K2 to be normally turned on or intermittently turned on. At this time, the battery 100 supplies power to the second load 320 but not to the first load 310. When the battery voltage is less than the second threshold voltage, the main control unit 230 controls the second switch unit K2 to be turned off, and the battery 100 does not supply power to the first load 310 or the second load 320.

[0109] In this embodiment, the second switching unit K2 includes a charging switch and a discharging switch (see 4 for reference). The charging switch and the discharging switch are connected in series. Both the charging switch and the discharging switch are MOSFETs or transistors, etc. The control terminals of the charging switch and the discharging switch are electrically connected to the main control unit 230, so that the main control unit 230 can control the charging switch and the discharging switch to turn on and off, respectively. However, this application is not limited to this. In other embodiments of this application, the second switching unit K2 includes a second switching transistor, and the battery protection circuit 200 includes a substrate switching control unit. The second switching transistor is a MOSFET or transistor, etc. The control terminal of the second switching transistor is electrically connected to the main control unit 230. The substrate switching control unit is connected to the main control unit 230 and is used to achieve correct biasing of the substrate of the second switching transistor. In addition, in other embodiments of this application, the second switching unit K2 can also be implemented in other ways, such as including only one switching transistor. In this embodiment, the second switching unit K2 is used to control the battery 100 to supply power to the second load 320 and the first load 310.

[0110] In this embodiment, the first switching unit K1 is, for example, a MOS transistor or a PMOS transistor, but this application is not limited to this. In other embodiments of this application, the second switching unit K2 can also be a transistor, an IGBT, etc., and this application does not limit this. In this embodiment, during normal operation, the current flowing through the first switching unit K1 is less than the current flowing through the second switching unit K2, but they are similar. Therefore, the number of parallel transistor cells included in the first switching unit K1 is similar to the number of parallel transistor cells included in the second switching unit K2. This embodiment is relatively more expensive than the first embodiment.

[0111] In other embodiments of this application, the fourth resistor R4 may not be provided, and the third sampling voltage may be the voltage on the second switching unit K2.

[0112] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0113] It should be understood that "a plurality of" as used herein refers to two or more. Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0114] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus embodiments, since they are basically similar to the method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0115] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A battery protection circuit comprising two switching units, characterized in that, include: The main control unit and the first switching unit are connected to the control terminal of the first switching unit. The first switching unit is used to connect in series with a first load and to control whether the battery supplies power to the first load. The second switching unit is connected to the main control unit. The second switching unit is used to control whether the battery supplies power to the second load. Under normal operation, the power consumption of the second load is less than that of the first load. The over-discharge protection module has its input terminal connected to the battery voltage and its output terminal connected to the main control unit. Specifically, when the over-discharge protection module determines that the battery voltage is greater than or equal to a preset first threshold voltage, the main control unit controls both switching units to conduct normally. When the over-discharge protection module determines that the battery voltage is less than the first threshold voltage but greater than or equal to a preset second threshold voltage, the main control unit controls the first switching unit to disconnect and controls the second switching unit to conduct at least for a portion of the time. When the over-discharge protection module determines that the battery voltage is less than the second threshold voltage, the main control unit controls the battery to stop supplying power to the first load and the second load, wherein the second threshold voltage is less than the first threshold voltage.

2. The battery protection circuit according to claim 1, characterized in that, The second switching unit is connected in series with the second load. The first switching unit and the first load are located on the first branch, and the second switching unit and the second load are located on the second branch. The first branch and the second branch are connected in parallel. During normal operation, the current flowing through the first load is greater than the current flowing through the second load. Specifically, when the over-discharge protection module determines that the battery voltage is less than the second threshold voltage, the main control unit controls both switching units to disconnect and cut off.

3. The battery protection circuit according to claim 1, characterized in that, The first switching unit and the first load are located on the first branch, and the second load is located on the second branch. The first branch and the second branch are connected in parallel, and the circuit formed by the parallel connection is connected in series with the second switching unit. During normal operation, the current flowing through the first load is greater than the current flowing through the second load. Specifically, when the over-discharge protection module determines that the battery voltage is less than the second threshold voltage, the main control unit controls the second switching unit to disconnect and cut off.

4. The battery protection circuit according to claim 1, characterized in that, The battery protection circuit further includes a battery voltage sampling unit, which is connected to the positive terminal and the negative terminal of the battery. The battery voltage sampling unit is used to sample the battery voltage to obtain a first sampling voltage. The over-discharge protection module is connected to the first sampling voltage. The over-discharge protection module is also connected to a first reference voltage and a second reference voltage, wherein the second reference voltage is less than the first reference voltage. Specifically, when the over-discharge protection module determines that the first sampling voltage is greater than or equal to the first reference voltage, the main control unit controls both switching units to conduct normally. When the over-discharge protection module determines that the first sampling voltage is less than the first reference voltage but greater than or equal to the second reference voltage, the main control unit disconnects the first switching unit and controls the second switching unit to conduct for at least part of the time. When the over-discharge protection module determines that the first sampling voltage is less than the second reference voltage, the main control unit controls the battery to stop supplying power to the first load and the second load.

5. The battery protection circuit according to claim 1, characterized in that, The battery protection circuit further includes a battery voltage sampling unit, which is connected to the positive and negative terminals of the battery. The battery voltage sampling unit is used to sample the battery voltage to obtain a first sampling voltage and a second sampling voltage. The first sampling voltage and the second sampling voltage are used to characterize the same battery voltage. The first sampling voltage is less than the second sampling voltage. The over-discharge protection module is connected to the first sampling voltage and the second sampling voltage. The over-discharge protection module is also connected to a first reference voltage. Specifically, when the over-discharge protection module determines that the first sampling voltage is greater than or equal to the first reference voltage, the main control unit controls both switching units to conduct normally. When the over-discharge protection module determines that the second sampling voltage is greater than or equal to the first reference voltage and the first sampling voltage is less than the first reference voltage, the main control unit controls the first switching unit to disconnect and controls the second switching unit to conduct at least for a portion of the time. When the second sampling voltage is less than the first reference voltage, the main control unit controls the battery to stop supplying power to the first load and the second load.

6. The battery protection circuit according to claim 1, characterized in that, When the battery voltage is less than the first threshold voltage and greater than or equal to the second threshold voltage, the main control unit controls the second switching unit to be turned on intermittently.

7. The battery protection circuit according to claim 6, characterized in that, When the battery voltage is less than the first threshold voltage and greater than or equal to the second threshold voltage, the duty cycle of the second switching unit decreases step by step as the battery voltage decreases.

8. The battery protection circuit according to claim 7, characterized in that, The over-discharge protection module includes a first over-discharge protection unit and n over-discharge protection sub-units, where n is an integer greater than or equal to 2. The input terminal of the first over-discharge protection unit is connected to a first sampling voltage and a first reference voltage. The input terminals of the n over-discharge protection sub-units are respectively connected to a first sampling voltage, a second first reference sub-voltage, a second second reference sub-voltage, ..., a second nth reference sub-voltage. The first sampling voltage is used to characterize the battery voltage, and the first reference voltage > the second first reference sub-voltage > the second second reference sub-voltage > ... > the second nth reference sub-voltage. The first reference voltage corresponds to the first threshold voltage, and the second nth reference sub-voltage corresponds to the second threshold voltage. The first over-discharge protection unit is used to compare the magnitude of the first sampling voltage with the first reference voltage, and the n over-discharge protection sub-units are used to compare the magnitude of the first sampling voltage with the corresponding reference sub-voltage. Wherein, when the first sampling voltage is less than the first reference voltage and greater than or equal to the second first reference sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D1; when the first sampling voltage is less than the second first reference sub-voltage and greater than or equal to the second second reference sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D2, ...; when the first sampling voltage is less than the second (n-2) reference sub-voltage and greater than or equal to the second (n-1) reference sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D(n-1); when the first sampling voltage is less than the second (n-1) reference sub-voltage and greater than or equal to the second n reference sub-voltage, the main control unit controls the duty cycle of the second switching unit to be Dn; when the first sampling voltage is less than the second n reference sub-voltage, the main control unit controls the second switching unit to be normally open, wherein 1 > D1 > D2 > ... > Dn > 0.

9. The battery protection circuit according to claim 7, characterized in that, The over-discharge protection module includes a first over-discharge protection unit and n over-discharge protection sub-units, where n is an integer greater than or equal to 2. The input terminal of the first over-discharge protection unit is connected to a first sampling voltage and a first reference voltage. The input terminals of the n over-discharge protection sub-units are respectively connected to a second first sampling sub-voltage, a second second sampling sub-voltage, ..., a second nth sampling sub-voltage, and a first reference voltage. The first sampling voltage, the second first sampling sub-voltage, the second second sampling voltage, ..., the second nth sampling sub-voltage are all used to characterize the battery voltage. The first sampling voltage < the second first sampling sub-voltage < the second second sampling voltage < ... < the second nth sampling voltage. The first over-discharge protection unit is used to compare the magnitude of the first sampling voltage with the first reference voltage, and the n over-discharge protection sub-units are used to compare the magnitude of the first reference voltage with the corresponding sampling sub-voltage. Wherein, when the first reference voltage is greater than the first sampling sub-voltage and less than or equal to the second sampling sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D1; when the first reference voltage is greater than the second sampling sub-voltage and less than or equal to the second sampling sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D2, ...; when the first reference voltage is greater than the second (n-2) sampling sub-voltage and less than or equal to the second (n-1) sampling sub-voltage, the main control unit controls the duty cycle of the second switching unit to be D(n-1); when the first reference voltage is greater than the second (n-1) sampling sub-voltage and less than or equal to the nth sampling sub-voltage, the main control unit controls the duty cycle of the second switching unit to be Dn; when the first reference voltage is greater than the nth sampling sub-voltage, the main control unit controls the second switching unit to be normally open, wherein 1 > D1 > D2 > ... > Dn > 0.

10. The battery protection circuit according to claim 7, characterized in that, The battery protection circuit also includes an overcurrent protection module, whose first input terminal is connected to a third sampling voltage, whose second input terminal is connected to a current threshold, and whose output terminal is connected to the main control unit. When the third sampling voltage is greater than or equal to the current threshold and lasts for a third delay, the main control unit controls the battery to stop supplying power to the first load and the second load. The third sampling voltage is used to characterize the sum of the currents flowing through the first load and the second load. As the duty cycle of the second switching unit decreases step by step, the third delay duration decreases step by step.

11. The battery protection circuit according to claim 1, characterized in that, The battery protection circuit also includes an overcurrent protection module, whose first input terminal is connected to a third sampling voltage, whose second input terminal is connected to a third current threshold or a fourth current threshold, and whose output terminal is connected to the main control unit. When the signal at the first input terminal of the overcurrent protection module is greater than or equal to the signal at its second input terminal, the main control unit controls the battery to stop discharging. The third sampling voltage is used to characterize the sum of the currents flowing through the first load and the second load. When the battery voltage is greater than or equal to the first threshold voltage, the second input terminal of the overcurrent protection module is connected to the third current threshold. When the battery voltage is less than the first threshold voltage, the second input terminal of the overcurrent protection module is connected to the fourth current threshold, which is less than the third current threshold.

12. The battery protection circuit according to any one of claims 1-11, characterized in that, The battery protection circuit also includes a boost unit, which is connected in series with the second load. The first end of the boost unit is used to connect to the positive terminal of the battery, and the second end of the boost unit is used to connect to the second load. The boost unit is used to boost the voltage of the battery when it is low in order to supply power to the second load.

13. The battery protection circuit according to claim 12, characterized in that, The control terminal of the boost unit is connected to the main control unit. The battery protection circuit also includes a voltage judgment unit. The first input terminal of the voltage judgment unit is connected to the battery voltage, and its output terminal is connected to the main control unit. Specifically, when the battery voltage is greater than or equal to a preset fifth threshold voltage, the main control unit controls the boost unit to enable it to save energy; when the battery voltage is less than the fifth threshold voltage, the main control unit controls the boost unit to enable it to boost the battery voltage. The fifth threshold voltage is between the first threshold voltage and the second threshold voltage.

14. The battery protection circuit according to any one of claims 1-11, characterized in that, The battery protection circuit is located on the same chip.

15. A battery assembly, characterized in that, include: Battery; The battery protection circuit as described in any one of claims 1-14, wherein the battery protection circuit is connected to the battery.

16. An electronic device, characterized in that, include: First load, second load; The battery protection circuit as described in any one of claims 1-14 or the battery assembly as described in claim 15; The first load is connected to the battery via the first switching unit, and the second load is connected to the battery via the second switching unit.

17. The electronic device according to claim 16, characterized in that, The second load includes a remote positioning module.

Images