Charging protection circuit and electronic equipment

Abstract

The utility model relates to the technical field of charging protection, and provides a charging protection circuit and electronic equipment, one end of the charging protection circuit is used for being connected with a charging port, and the other end of the charging protection circuit is used for being connected with a power receiving port; the charging protection circuit comprises a first diode, a switch tube and a controller. The anode of the first diode is connected with the charging port; the first end of the switch tube is connected with the cathode of the first diode, and the second end of the switch tube is connected with the power receiving port; the controller is connected with the third end of the switch tube; the controller is used for controlling the switching tube to be switched off when detecting that the voltage at the two ends of the switching tube is greater than or equal to a first preset voltage and / or the current flowing through the switching tube is greater than or equal to a first preset current. According to the charging protection circuit, the first diode and the switching tube are connected in series, and the controller controls the switching tube to be switched off when detecting overvoltage or overcurrent so as to protect a circuit connected with the power receiving port; the charging protection circuit is more reasonable in structure and small in occupied area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging protection, in particular to a charging protection circuit and an electronic device. BACKGROUND

[0002] The electronic device is generally provided with a surge protection circuit for charging protection. The surge protection circuit is a circuit for protecting the electronic device from surge voltage or surge current damage, which usually protects the circuit through a surge signal in a discharge path.

[0003] The surge protection circuit of the related art occupies a large area, which cannot meet the production requirements of small electronic devices. CONTENT

[0004] The main purpose of the present application is to provide a charging protection circuit and an electronic device to protect the circuit connected to the power receiving port. The structure of the charging protection circuit is more reasonable, and the occupied area is smaller, which can meet the production requirements of small electronic devices.

[0005] The first aspect of the present application provides a charging protection circuit, one end of the charging protection circuit is used for connecting with a charging port, and the other end of the charging protection circuit is used for connecting with a power receiving port; the charging protection circuit comprises a first diode, a switch tube and a controller; an anode of the first diode is connected with the charging port; a first end of the switch tube is connected with a cathode of the first diode, and a second end of the switch tube is connected with the power receiving port; the controller is connected with a third end of the switch tube; the controller is used for controlling the switch tube to be disconnected when detecting that a voltage across the switch tube is greater than or equal to a first preset voltage and / or a current flowing through the switch tube is greater than or equal to a first preset current.

[0006] In an exemplary embodiment, the switch tube and the controller are both arranged on a first chip.

[0007] In an exemplary embodiment, the charging protection circuit further comprises a voltage transient suppressor; one end of the voltage transient suppressor is connected with the charging port, and the other end of the voltage transient suppressor is grounded; the voltage transient suppressor is in a conduction state when a forward voltage or a reverse voltage of the charging port is greater than a second preset voltage, so as to discharge the forward voltage or the reverse voltage greater than the second preset voltage to the ground.

[0008] In an exemplary embodiment, a reverse working voltage of the voltage transient suppressor is greater than a rated voltage of the charging port, and a clamping voltage of the voltage transient suppressor is less than or equal to 25V.

[0009] In an exemplary embodiment, the charging protection circuit further comprises a capacitor; one end of the capacitor is connected with the power receiving port and the second end of the switch tube, and the other end of the capacitor is grounded.

[0010] In an exemplary embodiment, the first diode is a Schottky diode.

[0011] In an exemplary embodiment, the forward voltage drop of the first diode is less than or equal to 0.3V.

[0012] In an exemplary embodiment, the charging protection circuit is arranged on a circuit board, and the area of the charging protection circuit on the circuit board is less than or equal to 5mm 2 .

[0013] The second aspect of the present application provides an electronic device, which comprises a charging port, a power receiving port, a battery and a charging protection circuit as described in the first aspect; one end of the charging protection circuit is connected with the charging port, and the other end of the charging protection circuit is connected with the power receiving port; the battery is connected with the power receiving port.

[0014] In an exemplary embodiment, the capacity of the battery is less than or equal to 80mAh; and / or the charging current of the battery is less than or equal to 80mA.

[0015] The present application provides a charging protection circuit and an electronic device; one end of the charging protection circuit is used for being connected with a charging port, and the other end of the charging protection circuit is used for being connected with a power receiving port; the charging protection circuit comprises a first diode, a switch tube and a controller; an anode of the first diode is connected with the charging port; a first end of the switch tube is connected with a cathode of the first diode, and a second end of the switch tube is connected with the power receiving port; the controller is connected with a third end of the switch tube; the controller is used for controlling the switch tube to be disconnected when detecting that a voltage across the switch tube is greater than or equal to a first preset voltage and / or a current flowing through the switch tube is greater than or equal to a first preset current. In the charging protection circuit of the present application, the first diode and the switch tube are connected in series, and the controller controls the switch tube to be disconnected when detecting overvoltage or overcurrent, so as to protect the circuit connected with the power receiving port and avoid damage caused by surge voltage or surge current; and the structure of the charging protection circuit is more reasonable, the occupied area is relatively small, and the production requirements of small electronic devices can be met. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0017] Figure 1 A structural schematic diagram of a charging protection circuit provided by an embodiment of the present application is shown in FIG. 1.

[0018] Figure 2 A structural schematic diagram of a charging protection circuit provided by another embodiment of the present application is shown in FIG. 2.

[0019] Figure 3 A structural schematic diagram of an electronic device provided by an embodiment of the present application is shown in FIG. 3.

[0020] Figure 4 An internal structural schematic diagram of an electronic device provided by an embodiment of the present application is shown in FIG. 4. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort on the premise that the present application falls within the scope of protection.

[0022] The present application provides a charging protection circuit and an electronic device. The structure of the charging protection circuit is more reasonable, and the occupied area is relatively small, which can meet the production requirements of small electronic devices.

[0023] In order to make the purposes, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort on the premise that the present application falls within the scope of protection.

[0024] Please refer to Figure 1The embodiment of the present application provides a charging protection circuit, one end of the charging protection circuit is used for being connected with a charging port 1, and the other end of the charging protection circuit is used for being connected with a powered port 2; the charging protection circuit comprises: a first diode D1, a switch tube 32 and a controller 31; the anode of the first diode D1 is connected with the charging port 1; the first end of the switch tube 32 is connected with the cathode of the first diode D1, and the second end of the switch tube 32 is connected with the powered port 2; the controller 31 is connected with the third end of the switch tube 32; and the controller 31 is used for controlling the switch tube 32 to be disconnected when detecting that the voltage across the switch tube 32 is greater than or equal to a first preset voltage and / or the current flowing through the switch tube 32 is greater than or equal to a first preset current.

[0025] For example, the first preset voltage is 1 to 2 times of the rated voltage of the powered port 2; and / or the first preset current is 1 to 2 times of the rated current of the powered port 2. For example, the first preset voltage is 1.2 times of the rated voltage of the powered port 2; and / or the first preset current is 1.2 times of the rated current of the powered port 2. When the charging port 1 is connected with an external power supply, the controller 31 can detect the voltage across the switch tube 32 and / or the current flowing through the switch tube 32, and control the switch tube 32 to be disconnected when detecting that the voltage across the switch tube 32 is greater than the first preset voltage and / or the current flowing through the switch tube 32 is greater than the first preset current, thereby avoiding overvoltage or overcurrent from damaging the circuit connected with the powered port 2.

[0026] The first diode D1 only allows current to flow from the anode to the cathode, and therefore, the first diode D1 can prevent current from flowing reversely from the powered port 2 to the charging port 1. For example, even if the charging port 1 has a low voltage for a moment or for a long time, the current will not flow reversely to the charger connected with the charging port 1.

[0027] The switch tube 32 in the embodiment of the present application can be an N-channel MOS tube, the drain of the switch tube 32 is connected with the cathode of the first diode D1, the source of the switch tube 32 is connected with the powered port 2, and the gate of the switch tube 32 is connected with the controller 31.

[0028] The charging protection circuit in the embodiment of the present application comprises a branch composed of the first diode D1 and the switch tube 32, and the controller 31 controls the switch tube 32, and the charging protection circuit adopts an overvoltage and overcurrent logic control device without a back-to-back structure, which can meet the surge protection requirement (such as ±200V surge protection requirement) at the charging port 1 and greatly reduce the layout area of the charging protection circuit.

[0029] The protection circuit in the related art is a back-to-back structure over-voltage and over-current logic control device, that is, two parallel branches each composed of a diode and an over-voltage and over-current logic control device. Generally, the packaging area of the over-voltage and over-current logic control device with the back-to-back structure is about 4mm 2 , and the packaging area of the over-voltage and over-current logic control device without the back-to-back structure can be less than or equal to 2mm 2 , for example, about 0.55mm 2 .

[0030] Therefore, the related art deploys the over-voltage and over-current logic control device with the back-to-back structure, which is difficult to meet the production requirements of small electronic devices. Obviously, compared with the related art, the charging protection circuit in the embodiment of the present application has a smaller occupied area, which can meet the production requirements of small electronic devices.

[0031] The charging protection circuit provided in the embodiment of the present application has one end connected with the charging port 1 and the other end connected with the powered port 2. The charging protection circuit comprises a first diode D1, a switch tube 32 and a controller 31. The anode of the first diode D1 is connected with the charging port 1. The first end of the switch tube 32 is connected with the cathode of the first diode D1, and the second end of the switch tube 32 is connected with the powered port 2. The controller 31 is connected with the third end of the switch tube 32. The controller 31 is configured to control the switch tube 32 to be disconnected when detecting that the voltage across the switch tube 32 is greater than or equal to a first preset voltage and / or the current flowing through the switch tube 32 is greater than or equal to a first preset current. In the charging protection circuit in the embodiment of the present application, the first diode D1 and the switch tube 32 are connected in series, and the controller 31 controls the switch tube 32 to be disconnected when detecting over-voltage or over-current, so as to protect the circuit connected with the powered port 2 and avoid damage caused by surge voltage or surge current. Moreover, the structure of the charging protection circuit is more reasonable, and the occupied area is smaller, which can meet the production requirements of small electronic devices.

[0032] In an exemplary embodiment, as shown in Figure 2 , the switch tube 32 and the controller 31 can be arranged on the first chip 3.

[0033] In the embodiment of the present application, the switch tube 32 and the controller 31 are integrated on the first chip 3, which has a high integration degree and can further reduce the occupied space of the elements in the charging protection circuit, so as to further meet the production requirements of small electronic devices.

[0034] In an exemplary embodiment, as shown in Figure 2As shown, the charging protection circuit further comprises a voltage transient suppressor TVS, one end of the voltage transient suppressor TVS is connected with the charging port 1, and the other end of the voltage transient suppressor TVS is grounded; when the forward voltage or the reverse voltage of the charging port 1 is greater than the second preset voltage, the voltage transient suppressor TVS is in a conduction state, so as to discharge the forward voltage or the reverse voltage greater than the second preset voltage to the ground.

[0035] Optionally, the second preset voltage can be the reverse working voltage of the voltage transient suppressor TVS. The reverse working voltage is the highest reverse voltage that the voltage transient suppressor TVS can withstand when not conducting. When the power output by the external power supply fluctuates greatly during the charging process of connecting the charging port 1 with the external power supply, causing the forward voltage or the reverse voltage of the charging port 1 to be greater than the reverse working voltage of the voltage transient suppressor TVS, the voltage transient suppressor TVS rapidly conducts, so as to discharge the forward voltage or the reverse voltage greater than the reverse working voltage to the ground, thereby preventing the voltage at the power receiving port 2 from being too high, so as to protect the functional devices of the electronic device from being damaged. When the forward voltage or the reverse voltage of the charging port 1 is less than the reverse working voltage of the voltage transient suppressor TVS, the voltage transient suppressor TVS does not conduct, at this time, the controller 31 detects the voltage across the switch tube 32 and / or the current flowing through the switch tube 32 and controls the switch tube 32 to be disconnected when necessary, so as to perform secondary protection.

[0036] Optionally, the voltage transient suppressor TVS can provide protection in both positive and negative directions, and is suitable for bidirectional direct current circuits of forward voltage or reverse voltage, and has anti-reverse connection capability, so that the requirement for the structure can be relaxed on some electronic devices with special structure that cannot effectively limit the charging port 1. Even if the structure of the charging port 1 of a small electronic device (such as a smart ring, a Bluetooth earphone, a smart bracelet, etc.) is not well limited, causing the positive and negative poles to be reversely connected, the related circuits for charging will not be damaged.

[0037] The voltage transient suppressor TVS meets the IEC 61000-4-5 standard and can withstand high-energy surge impact. For example, under the lightning pulse impact of 8 / 20 μs, the voltage transient suppressor TVS can withstand a surge current greater than or equal to 100 A, so as to protect the electronic device from being damaged by lightning or switch transient high peak energy.

[0038] In an exemplary embodiment, the reverse working voltage of the voltage transient suppressor TVS is greater than the rated voltage of the charging port, and the clamping voltage of the voltage transient suppressor TVS is less than or equal to 25 V.

[0039] The maximum voltage that the voltage transient suppressor TVS can withstand when not conducting is greater than the rated voltage of the charging port 1, for example, greater than 1.5 to 3 times the rated voltage of the charging port 1, which can ensure that the voltage transient suppressor TVS does not conduct in the case that the voltage of the charging port 1 is not very large, and prevent the voltage transient suppressor TVS from conducting due to a small amplitude fluctuation of the voltage of the charging port 1, thereby causing abnormality of the circuit.

[0040] For example, the clamping voltage refers to the voltage that the voltage transient suppressor TVS can limit the transient overvoltage to a lower voltage value when in the conducting state. Specifically, when the voltage of the charging port 1 is greater than the reverse working voltage of the voltage transient suppressor TVS, the voltage transient suppressor TVS will quickly conduct and clamp the voltage below the clamping voltage. The clamping voltage of the voltage transient suppressor TVS in the embodiments of the present application can be less than or equal to 25V, thereby ensuring that the circuit is fully protected when subjected to an overvoltage impact, to ensure the stability and safety of the circuit.

[0041] In some embodiments, the voltage transient suppressor TVS in the embodiments of the present application can adopt a DFN1006 package, which is more compact, smaller in size and has high heat dissipation performance, thereby further reducing the size of the charging protection circuit, so that the charging protection circuit can be more suitable for small electronic devices.

[0042] In an exemplary embodiment, as shown in Figure 2 The charging protection circuit further includes a capacitor C, one end of the capacitor C is connected to the power receiving port 2 and the second end of the switch tube 32, and the other end of the capacitor C is grounded.

[0043] For example, one end of the capacitor C is connected to the power receiving port 2 and the source of the switch tube 32, and the other end of the capacitor C is grounded. Specifically, the capacitor C can stabilize and filter the voltage at the power receiving port 2 to improve the power quality at the power receiving port 2; for example, it can reduce the influence of voltage fluctuation at the charging port 1 on the power quality at the power receiving port 2. Furthermore, the capacitor C can also cooperate with the voltage transient suppressor TVS to jointly absorb and discharge surge energy.

[0044] In an exemplary embodiment, the first diode D1 is a Schottky diode.

[0045] The first diode D1 in the embodiments of the present application can be a Schottky diode, and the first diode D1 can adopt a DFN0603 package. The DFN0603 package is a small surface mount package, which is suitable for high-density assembly and is beneficial to further reduce the circuit board area, thereby making the charging protection circuit more suitable for small electronic devices.

[0046] In one exemplary embodiment, the forward voltage drop of the first diode D1 is less than or equal to 0.3V.

[0047] For example, a charging protection circuit is used to protect the battery of an electronic device during charging. When the battery capacity of the electronic device is less than or equal to 80mAh, and / or the battery charging current is less than or equal to 80mA (e.g., when the battery capacity is 50mAh and / or the battery charging current is 50mA), the rated forward current of the first diode D1 is 50mA. In this case, the forward voltage drop of the first diode D1 can be set to be less than or equal to 0.3V. By setting a lower forward voltage drop for the first diode D1 in this embodiment, the power consumption of the first diode D1 in the on-state can be reduced.

[0048] In one exemplary embodiment, the charging protection circuit is disposed on the circuit board, and the area of ​​the charging protection circuit on the circuit board is less than or equal to 5 mm². 2 .

[0049] For example, the charging protection circuit in this embodiment has a small footprint on the circuit board, which saves space. For instance, the footprint of the charging protection circuit on the circuit board can be less than or equal to 5 mm². 2 .

[0050] In related technologies, the board area of ​​the protection circuit corresponding to two parallel branches, each composed of diodes and overvoltage / overcurrent logic controllers, is generally greater than 7 mm². 2 Compared with related technologies, the embodiments of this application reduce the area required for deploying charging protection circuits in electronic devices.

[0051] For example, in embodiments of this application, the board area of ​​the charging protection circuit can be set to be less than or equal to 2 mm². 2 For example, 1.34mm 2 1.5mm 2 1.8mm 2 This significantly reduces the area required to deploy charging protection circuitry in electronic devices. Because the area required for deploying charging protection circuitry is reduced, more board space can be allocated to other functional modules (such as the CPU and memory), or additional functional modules can be added.

[0052] Please see Figure 3 This application also provides an electronic device, which includes a charging port 1, a power receiving port, a battery (not shown in the figure), and a charging protection circuit as described in the above embodiment; one end of the charging protection circuit is connected to the charging port 1, and the other end of the charging protection circuit is connected to the power receiving port; the battery is connected to the power receiving port.

[0053] It can be understood that the charging port 1 can be connected with an external power supply; the battery is connected with the power receiving port, and can obtain electric energy from the power receiving port.

[0054] For example, the electronic device can include a CPU (not shown in the figure), a memory (not shown in the figure), a touch screen 4 and the like functional modules. The CPU, the memory, the touch screen 4 can all be connected with the power receiving port to obtain electric energy from the power receiving port. The charging protection circuit can protect the circuit connected with the power receiving port in the electronic device when the charging port 1 is connected with the external power supply for charging. Specifically, when the electric energy output by the external power supply during the connection of the charging port 1 with the external power supply fluctuates greatly, the charging protection circuit can immediately disconnect the connection between the charging port 1 and the power receiving port, so as to avoid the high peak voltage or high peak current from flowing into the circuit connected with the power receiving port, thereby avoiding damage to the functional modules of the electronic device.

[0055] The electronic device of the embodiment of the present application has all the technical effects of the charging protection circuit as described above, that is, the circuit connected with the power receiving port can be protected by the charging protection circuit to avoid damage caused by the surge voltage or surge current; and the structure of the charging protection circuit is more reasonable, and the occupied area is relatively small, which can meet the production requirements of small electronic devices.

[0056] For example, as shown in Figure 4 The charging protection circuit can be arranged on the side close to the charging port 1 of the electronic device, so as to shorten the distance between the charging protection circuit and the charging port 1, so as to respond in time when the surge occurs, thereby protecting the electronic device more quickly.

[0057] In an exemplary embodiment, the electronic device in the embodiment of the present application can include a smart ring, a Bluetooth headset, a smart bracelet and the like small electronic devices.

[0058] In an exemplary embodiment, the capacity of the battery is less than or equal to 80 mAh; and / or the charging current of the battery is less than or equal to 80 mA.

[0059] For example, the capacity of the battery can be less than or equal to 80 mAh, for example, the capacity of the battery can be 40 mAh, 50 mAh, 70 mAh and the like. Obviously, the battery of the embodiment of the present application can store a relatively low amount of electric energy, and can be applied to some electronic devices with low power consumption and low requirements for endurance, such as a smart ring, a Bluetooth headset, a smart bracelet and the like.

[0060] It can be understood that the charging current of the battery can be less than or equal to 80 mA, for example, the charging current of the battery can be 40 mA, 50 mA, 70 mA and the like. By limiting the size of the charging current, the embodiment of the present application helps to control the temperature of the battery, so as to protect the battery from damage, thereby prolonging the service life of the device.

[0061] In addition, the battery of the electronic device can be disposed farther away from the charging integrated circuit, avoiding the situation of instantaneous power failure of the system due to current backflow.

[0062] The electronic system provided in the embodiments of the present application includes the electronic device and the charging line according to any one of the above embodiments, or includes the electronic device and the charging box according to any one of the above embodiments, and the charging box is internally provided with a battery. The electronic system provided in the embodiments of the present application has all the technical effects of the charging protection circuit and the electronic device as described above.

[0063] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0064] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be replaceably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present application according to the specific circumstances.

[0065] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging protection circuit, characterized by, One end of the charging protection circuit is used for connecting with the charging port, and the other end of the charging protection circuit is used for connecting with the powered port; The charging protection circuit comprises: a first diode, an anode of the first diode being connected with the charging port; a switch tube, a first end of the switch tube being connected with a cathode of the first diode, and a second end of the switch tube being connected with the powered port; a controller, connected with a third end of the switch tube; the controller is used for controlling the switch tube to be turned off when it is detected that a voltage across the switch tube is greater than or equal to a first preset voltage and / or a current flowing through the switch tube is greater than or equal to a first preset current.

2. The charge protection circuit of claim 1, wherein, The switch tube and the controller are both arranged on a first chip.

3. The charge protection circuit of claim 1, wherein, The charging protection circuit further comprises: a voltage transient suppressor, one end of the voltage transient suppressor being connected with the charging port, and the other end of the voltage transient suppressor being grounded; the voltage transient suppressor is in a conducting state when a forward voltage or a reverse voltage of the charging port is greater than a second preset voltage, so as to discharge the forward voltage or the reverse voltage greater than the second preset voltage to the ground.

4. The charge protection circuit of claim 3, wherein, A reverse working voltage of the voltage transient suppressor is greater than a rated voltage of the charging port, and a clamping voltage of the voltage transient suppressor is less than or equal to 25V.

5. The charge protection circuit of claim 1, wherein, The charging protection circuit further comprises: a capacitor, one end of the capacitor being connected with the powered port and the second end of the switch tube, and the other end of the capacitor being grounded.

6. The charge protection circuit of any one of claims 1 to 5, wherein, The first diode is a Schottky diode.

7. The charge protection circuit of claim 6, wherein, A forward voltage drop of the first diode is less than or equal to 0.3V.

8. The charge protection circuit according to any one of claims 1 to 5, wherein The charging protection circuit is arranged on a circuit board, and a layout area of the charging protection circuit on the circuit board is less than or equal to 5mm 2 .

9. An electronic device, comprising: The electronic device comprises a charging port, a powered port, a battery, and the charging protection circuit according to any one of claims 1 to 8; one end of the charging protection circuit is connected with the charging port, and the other end of the charging protection circuit is connected with the powered port; the battery is connected with the powered port.

10. The electronic device of claim 9, wherein, A capacity of the battery is less than or equal to 80mAh; and / or a charging current of the battery is less than or equal to 80mA.

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