Terminal device

Abstract

The embodiment of the utility model belongs to the technical field of terminal equipment, and provides terminal equipment. When the terminal equipment is started, a state indication signal is output through the voltage detection circuit. And if the state indication signal indicates that the battery is in the protection state, the channel selection circuit switches on the auxiliary charging chip, so that the auxiliary charging chip charges the battery when the external power supply is switched on. And in a battery charging process, when the state indication signal indicates that the battery is in a non-protection state, the channel selection circuit is connected with the main charging chip, so that the battery and the main charging chip supply power to a starting device of the terminal equipment based on an external power supply, and the terminal equipment is normally started. According to the application, whether the battery is in the protection state can be automatically identified, and when the battery is in the protection state, the battery can be charged through the auxiliary charging chip, so that the charged battery can provide electric energy for starting of the terminal equipment, and the terminal equipment can be normally started.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of terminal equipment. Background Art

[0002] The battery pack of the terminal device is generally equipped with a protection board and a battery. The protection board is used to protect the battery from damage due to excessive discharge. When the terminal device needs to be charged and plugged into the charger, if the battery is over-discharged, the protection board will enter the protection state, making the battery unable to provide current to the outside. At this time, the terminal device is turned on. If the current of the program required for system startup is greater than the default charging current that the charging chip of the terminal device can provide, the program cannot be executed to the node of increasing the charging current during execution. At this time, the charging current of the terminal device is the default charging current, which cannot be increased and cannot meet the current demand for the terminal device to start, and the terminal device will fail to start.

[0003] Therefore, how to enable the terminal device to start normally when the battery is over-discharged is an urgent problem to be solved. Utility Model Content

[0004] An embodiment of the present application provides a terminal device, which can be used to solve the problem that the terminal device cannot be normally powered on when the battery of the terminal device is over-discharged.

[0005] In a first aspect, an embodiment of the present application provides a terminal device, including:

[0006] a battery configured to provide electrical energy;

[0007] A voltage adjustment component, whose input end is used to connect to an external power source, and the voltage adjustment component is configured to adjust the voltage of the external power source to a first voltage, wherein the first voltage is lower than the voltage of the external power source;

[0008] a voltage detection circuit, connected to the battery and the voltage adjustment component respectively, and configured to output a state indication signal based on the output voltage of the battery and a reference voltage, wherein the state indication signal is used to indicate whether the battery is in a protection state, and the reference voltage is obtained based on the first voltage;

[0009] A main charging chip, configured to distribute electric energy to various components of the terminal device based on the external power supply, and to charge the battery;

[0010] an auxiliary charging chip, connected to the main charging chip and configured to charge the battery through the main charging chip;

[0011] A channel selection circuit is connected to the voltage detection circuit, the main charging chip, the auxiliary charging chip and the external power supply respectively, and the channel selection circuit is configured as follows:

[0012] When the terminal device is turned on, if the status indication signal indicates that the battery is in a protection state, the auxiliary charging chip is turned on, so that when the external power supply is turned on, the auxiliary charging chip charges the battery through the main charging chip;

[0013] During the battery charging process, when the status indication signal indicates that the battery is in a non-protected state, the main charging chip is turned on so that the main charging chip supplies power to the starting device of the terminal device based on the external power supply, so that the terminal device can start up normally.

[0014] In this embodiment, the terminal device includes a battery, a voltage adjustment component, a voltage detection circuit, a main charging chip, an auxiliary charging chip and a channel selection circuit. The input end of the voltage adjustment component is used to connect to an external power supply, and is configured to adjust the voltage of the external power supply to a first voltage. The voltage detection circuit is connected to the battery and the voltage adjustment component respectively, and is configured to output a status indication signal based on the output voltage of the battery and the reference voltage, and the status indication signal is used to indicate whether the battery is in a protection state. The channel selection circuit is connected to the voltage detection circuit, the main charging chip, the auxiliary charging chip and the external power supply respectively, and is configured to connect the auxiliary charging chip when the terminal device is turned on, if the status indication signal indicates that the battery is in a protection state, so that when the external power supply is turned on, the auxiliary charging chip charges the battery through the main charging chip. During the battery charging process, when the status indication signal indicates that the battery is in a non-protection state, the main charging chip is turned on, so that the battery and the main charging chip power the starting device of the terminal device based on the external power supply, so that the terminal device can be turned on normally. The present application can automatically identify whether the battery is in a protection state, and can charge the battery when the battery is in the protection state, so that the charged battery can provide power for starting the terminal device, thereby solving the problem that the battery enters a protection state due to over-discharge, making the terminal device unable to start up.

[0015] In some embodiments of the present application, the channel selection circuit includes a first load switch, a second load switch, a MOS and a first resistor;

[0016] The gate of the MOS is connected to the output end of the voltage detection circuit, the drain of the MOS is connected to the enable port of the first load switch through a first connection line, and the source of the MOS is grounded; the first end of the first resistor is connected to the first connection line, and the second end of the first resistor is connected to the output end of the voltage adjustment component; the output end of the first load switch is connected to the auxiliary charging chip; the enable port of the second load switch is connected to the output end of the voltage detection circuit; and the output end of the second load switch is connected to the main charging chip;

[0017] When the status indication signal indicates that the battery is in a protection state, the first load switch is turned on and the second load switch is turned off, so that the auxiliary charging chip is turned on; when the status indication signal indicates that the battery is in a non-protection state, the first load switch is turned off and the second load switch is turned on, so that the main charging chip is turned on.

[0018] In this embodiment, two load switches may be used to control the current path, thereby ensuring the performance of low impedance and high current in the charging path.

[0019] In some embodiments of the present application, the voltage detection circuit includes a voltage comparator, a second resistor and a third resistor;

[0020] Wherein, the first end of the second resistor is grounded, the second end of the second resistor is connected to the first end of the third resistor through a second connecting line; the second end of the third resistor is connected to the output end of the voltage adjustment component;

[0021] The negative electrode of the voltage comparator is connected to the second connecting line, and the positive electrode of the voltage comparator is connected to the positive electrode of the battery.

[0022] In this embodiment, it is possible to automatically identify whether the battery is in an over-discharge protection state by using a voltage comparator.

[0023] In some embodiments of the present application, when the output voltage of the battery is above the reference voltage, the state indication signal is at a high level, so that the state indication signal indicates that the battery is in a non-protection state;

[0024] When the output voltage of the battery is less than the reference voltage, the state indication signal is at a low level, so that the state indication signal indicates that the battery is in a protection state.

[0025] In this embodiment, whether the battery is in the protection state is automatically identified by the high and low levels of the state indication signal.

[0026] In some embodiments of the present application, the voltage adjustment component is an LDO voltage regulator chip.

[0027] In this embodiment, the voltage of the external power supply is stepped down by an LDO voltage regulator chip, so that a suitable power supply can be provided to the voltage detection circuit.

[0028] In some embodiments of the present application, the voltage adjustment component is a DC-DC DCDC power supply chip.

[0029] In this embodiment, the voltage of the external power supply is stepped down by the DCDC power chip, so that the voltage conversion efficiency can be improved.

[0030] In some embodiments of the present application, the MOS is NMOS.

[0031] In this embodiment, the inverter can be implemented by NMOS, and its characteristics such as high current carrying capacity and low on-resistance can be utilized to improve circuit reliability and reduce failure rate. In addition, the power consumption of NMOS when turned on is small, which can save electricity.

[0032] In some embodiments of the present application, the input end of the voltage adjustment component is a universal serial bus USB interface.

[0033] In this embodiment, the USB interface is connected to the main charging chip to achieve fast charging.

[0034] In some embodiments of the present application, the terminal device is a virtual reality VR device or a mobile terminal device.

[0035] In this embodiment, the terminal device may be a VR device or a mobile terminal device, which can improve the user experience.

[0036] In a second aspect, the present application provides a terminal device, including:

[0037] a battery configured to provide electrical energy;

[0038] A main charging chip connected to the battery, configured to distribute power to the battery and various components of the terminal device based on an external power source;

[0039] an auxiliary charging chip connected to the main charging chip, configured to charge the battery through the main charging chip;

[0040] The power supply control circuit connected to the external power source, the battery, the main charging chip and the auxiliary charging chip respectively is configured as follows:

[0041] Detecting whether the battery is in a protection state;

[0042] When the battery is not in the protection state, the main charging chip distributes electric energy to various components of the terminal device based on an external power supply and charges the battery;

[0043] When the battery is in a protection state, the battery is charged through the auxiliary charging chip; and during the battery charging process, if the battery enters an unprotected state, the starting device of the terminal device is powered by the main charging chip and the battery to enable the terminal device to start up normally.

[0044] In this embodiment, the terminal device includes a battery, a main charging chip, an auxiliary charging chip, and a power supply control circuit, wherein the power supply control circuit is configured to distribute power to various components of the terminal device and charge the battery through the main charging chip based on an external power supply when the battery is not in a protection state. When the battery is in a protection state, the battery is charged through the auxiliary charging chip, and during the battery charging process, if the battery enters an unprotected state, the main charging chip and the battery are used to power the starting device of the terminal device so that the terminal device can start normally. The present application can charge the battery when the battery is in a protection state, so that the charged battery can provide power for the startup of the terminal device, thereby solving the problem that the battery enters a protection state when over-discharged, making it impossible for the terminal device to start. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0046] Figure 1 A schematic diagram of charging a terminal device when the system current of the example of the present application is below the charging current;

[0047] Figure 2 A schematic diagram of charging a terminal device when the system current of the example of the present application is greater than the charging current;

[0048] Figure 3 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

[0049] Figure 4 A schematic diagram of the structure of a channel selection circuit 106 provided in an embodiment of the present application;

[0050] Figure 5 A schematic diagram of the structure of a voltage detection circuit 103 provided in an embodiment of the present application;

[0051] Figure 6 A schematic diagram of a voltage adjustment component 102 according to an example of the present application;

[0052] Figure 7A schematic diagram of a voltage comparator 31 exemplified in this application;

[0053] Figure 8 A schematic diagram of a first load switch 61 of an example of the present application;

[0054] Fig. 9 A schematic diagram of a second load switch 62 as an example of the present application;

[0055] Fig.10 A schematic diagram of the circuit structure of a terminal device 10 provided in an embodiment of the present application.

[0056] Description of reference numerals:

[0057] 101-battery; 102-voltage adjustment component;

[0058] 103- voltage detection circuit; 104- main charging chip;

[0059] 105- auxiliary charging chip; 106- channel selection circuit;

[0060] 10-terminal device; 61-first load switch;

[0061] 62-a second load switch; R1-a first resistor;

[0062] 31-voltage comparator; R2-second resistor;

[0063] R3-the third resistor; 107-a starting device. DETAILED DESCRIPTION

[0064] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0065] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0066] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0067] The main charging chip of the terminal device is configured with a preset default charging current, for example, the default charging current is 500mA (milliamperes). When the terminal device is turned on, the main charging chip powers various components based on the default charging current, wherein the various components include the central processing unit (CPU), memory, etc. Then the CPU loads the startup program into the memory, and then performs a series of device startup operations based on the startup program, such as loading the operating system, modifying the charging current output by the main charging chip, etc., to modify the charging current to meet the current that can be run when the terminal device is in the boot state.

[0068] When the battery voltage of the terminal device is low, after inserting the charger, Figure 1 This is a schematic diagram of charging a terminal device when the system current of the present application example is below the charging current, such as Figure 1 As shown, the charging current output by the main charging chip is divided into two parts: system current and battery current, wherein the system current is the current required by the CPU to run the boot program, and the battery current is for charging the battery.

[0069] but, Figure 2 This is a schematic diagram of charging a terminal device when the system current of the present application example is greater than the charging current, such as Figure 2 As shown, when the current required by the CPU to run the startup program is large (for example, more than 500mA), that is, the system current is greater than the charging current, the battery cannot be charged, and a portion of the current needs to be reversely provided to the CPU to meet the current requirements of the CPU to execute the startup program. If the battery is over-discharged, and the over-discharge voltage reaches the protection voltage of the battery protection board, the protection board enters the over-discharge protection state, which will cause the battery output voltage to be 0V (volts), and thus unable to provide current to the outside. The over-discharge protection state is referred to as the protection state below.

[0070] Since the battery cannot provide external current at this time, when the terminal device is turned on, the charging current of the main charging chip cannot meet the current requirement of the CPU to execute the startup program. Specifically, the CPU fails to execute the node for modifying the default current when running the startup program, which will cause the current of the main charging chip to be unable to increase, resulting in the terminal device being unable to start up normally.

[0071] Therefore, the present application provides a terminal device, which automatically identifies whether the battery is in a protection state through a corresponding power supply control circuit. When the battery is in the protection state, the auxiliary charging chip charges the battery through the main charging chip, so that after the charged battery exits the protection state, the terminal device provides current in reverse when the terminal device is turned on, thereby solving the problem that the battery enters a protection state due to excessive discharge, making it impossible to start the terminal device.

[0072] Specifically, the power supply control circuit may include: a voltage adjustment component, a voltage detection circuit and a channel selection circuit, which are described in detail through the following embodiments.

[0073] The technical solution of the present application is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other or exist independently. The same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0074] Figure 3 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the terminal device 10 includes:

[0075] The battery 101 is configured to provide electrical energy. Specifically, the battery 101 can be used to provide electrical energy for other components of the terminal device.

[0076] The voltage adjustment component 102 has an input end for connecting to an external power source, and the voltage adjustment component 102 is configured to adjust the voltage of the external power source to a first voltage, which is less than the voltage of the external power source. The external power source may be, for example, a switching power source, i.e., a charger of the terminal device, which may convert a high-frequency power source into a power supply of the terminal device 10, for example, the high-frequency power source is 220V, and the power supply of the terminal device 10 is 5V.

[0077] The voltage detection circuit 103 is connected to the battery 101 and the voltage adjustment component 102 respectively. The voltage detection circuit 103 is configured to output a state indication signal based on the output voltage of the battery 101 and the reference voltage. The state indication signal is used to indicate whether the battery 101 is in a protection state. The reference voltage is obtained based on the first voltage. Among them, the reference voltage can be set according to the over-discharge protection voltage of the protection board of the battery 101 (the voltage threshold for the battery to enter the protection state). Exemplarily, the reference voltage can be obtained by the voltage detection circuit 103 dividing the first voltage through the corresponding resistor.

[0078] The main charging chip 104 is configured to distribute power to various components of the terminal device 10 based on an external power source, and to charge the battery 101. The various components may be, for example, a CPU, a memory, a display screen, etc. It is understood that the various components described here do not include the battery 101.

[0079] The auxiliary charging chip 105 is connected to the main charging chip 104 and is configured to charge the battery 101 through the main charging chip 104 .

[0080] The channel selection circuit 106 is connected to the voltage detection circuit 103, the main charging chip 104, the auxiliary charging chip 105 and the external power supply respectively. The channel selection circuit 106 is configured as follows:

[0081] When the terminal device 10 is turned on, if the status indication signal indicates that the battery 101 is in a protection state, the auxiliary charging chip 105 is turned on, so that when the external power supply is turned on, the auxiliary charging chip 105 charges the battery 101 through the main charging chip 104.

[0082] During the charging process of battery 101, when the status indication signal indicates that battery 101 is in a non-protected state, the main charging chip is turned on, so that battery 101 and main charging chip 104 supply power to the starting device 107 of terminal device 10 based on an external power supply, so that terminal device 10 can start normally.

[0083] The starting device 107 of the terminal device 10 may be a CPU.

[0084] Specifically, Figure 1 As shown, the auxiliary charging chip 105 can be connected to the output end of the system current corresponding circuit (the output end is also connected to the CPU), so that the auxiliary charging chip 105 can charge the battery 101 through the MOS4 of the main charging chip 104.

[0085] It can be understood that the status indication signal is based on the output voltage and reference voltage of the battery 101. For example, it can indicate whether the battery 101 is in a protection state based on the level of the status indication signal. When the output voltage is above the reference voltage, the level of the status indication signal becomes a high level, and when the output voltage is lower than the reference voltage, the status indication signal becomes a low level. Therefore, during the charging process of the battery 101, the output voltage of the battery 101 will increase, and when the output voltage is higher than the reference voltage, the status indication signal will change from a high level to a low level.

[0086] like Figure 4 As shown, the output end of the main charging chip 104 is respectively connected to the starting device 107 and the battery 101. It can be understood that after the terminal device 10 is successfully powered on, the main charging chip 104 can continue to supply power to the starting device 107 and charge the battery 101.

[0087] In a possible implementation, the input end of the voltage adjustment component 102 may be a Universal Serial Bus (USB) interface, and fast charging can be achieved by connecting to the main charging chip 104 via the USB interface.

[0088] In this embodiment, the terminal device 10 includes a battery 101, a voltage adjustment component 102, a voltage detection circuit 103, a main charging chip 104, an auxiliary charging chip 105 and a channel selection circuit 106. The input end of the voltage adjustment component 102 is used to connect to an external power source, and is configured to adjust the voltage of the external power source to a first voltage. The voltage detection circuit 103 is connected to the battery 101 and the voltage adjustment component 102, respectively, and is configured to output a status indication signal based on the output voltage of the battery 101 and the reference voltage, and the status indication signal is used to indicate whether the battery 101 is in a protection state. The channel selection circuit 106 is connected to the voltage detection circuit 103, the main charging chip 104 and the auxiliary charging chip 105, respectively, and is configured to connect the auxiliary charging chip 105 when the terminal device 10 is turned on, if the status indication signal indicates that the battery 101 is in a protection state, so that when the external power source is turned on, the auxiliary charging chip 105 charges the battery 101 through the main charging chip 104. During the charging process of the battery 101, when the status indication signal indicates that the battery 101 is in a non-protection state, the main charging chip 104 is turned on, so that the battery 101 and the main charging chip 104 supply power to the starting device 107 of the terminal device 10 based on the external power supply, so that the terminal device 10 can be normally started. The present application can automatically identify whether the battery is in a protection state, and can charge the battery when the battery is in the protection state, so that the charged battery can provide power for the startup of the terminal device, thereby solving the problem that the battery enters a protection state when over-discharged, making it impossible for the terminal device to start.

[0089] In a possible implementation manner, the terminal device may be a mobile terminal device, such as a mobile phone, a tablet computer, etc.

[0090] In a possible implementation, the terminal device may be a virtual reality (VR) device, such as VR glasses, or the terminal device may be an augmented reality (AR) device, such as an AR glasses control box.

[0091] In a possible implementation, the channel selection circuit 106 may control the charging path of the terminal device 10 through an analog switch chip.

[0092] In a possible implementation, the channel selection circuit 106 may control the charging path of the terminal device 10 through two load switches. For details, reference may be made to the following embodiments.

[0093] Figure 4 A schematic diagram of the structure of a channel selection circuit 106 provided in an embodiment of the present application is shown in FIG. Figure 4As shown, the channel selection circuit 106 includes a first load switch 61, a second load switch 62, a MOS and a first resistor R1.

[0094] The gate of the MOS is connected to the output end of the voltage detection circuit 103 , the drain of the MOS is connected to the enable port of the first load switch 61 through a first connection line, and the source of the MOS is grounded.

[0095] A first end of the first resistor R1 is connected to the first connection line, and a second end of the first resistor R1 is connected to the output end of the voltage adjustment component 102 .

[0096] The output end of the first load switch 61 is connected to the auxiliary charging chip 105. The enable port of the second load switch 62 is connected to the output end of the voltage detection circuit 103. The output end of the second load switch 62 is connected to the main charging chip 104.

[0097] When the state indication signal indicates that the battery 101 is in the protection state, the first load switch 61 is turned on and the second load switch 62 is turned off, so that the auxiliary charging chip 105 is turned on and the main charging chip 104 is turned off.

[0098] That is, when the status indication signal indicates that the battery 101 is in the protection state, the charging path of the auxiliary charging chip 105 is connected and the charging path of the main charging chip 104 is disconnected, so that the auxiliary charging chip 105 can charge the battery 101 through the main charging chip.

[0099] When the state indication signal indicates that the battery 101 is in a non-protection state, the first load switch 61 is turned off and the second load switch is turned on, so that the main charging chip 104 is turned on.

[0100] That is to say, when the status indication signal indicates that the battery 101 is in a non-protected state, the charging path of the main charging chip 104 is connected and the charging path of the auxiliary charging chip 105 is disconnected, so that the battery 101 and the main charging chip 104 supply power to the starting device 107 of the terminal device 10 based on an external power supply, so that the terminal device 10 can start up normally.

[0101] Based on the channel selection circuit 106 of this embodiment, when the terminal device 10 is turned on, if the channel selection circuit 106 detects that the battery 101 is in the protection state through the status indication signal, the auxiliary charging chip 105 can be controlled to charge the battery 101 through the main charging chip, so that the charged battery 101 can provide power to the starting device 107 of the terminal device 10 when exiting the protection state, so that the terminal device 10 can be turned on normally. If the channel selection circuit 106 detects that the battery 101 is in the non-protection state through the status indication signal, the starting device 107 of the terminal device 10 can be powered by the battery 101 and the main charging chip 104, so that the terminal device 10 can be turned on normally.

[0102] It is understandable that when the terminal device 10 is started, if the following Figure 2 In the case where the battery 101 reversely supplies power to the starting device 107 of the terminal device 10, during the reverse power supply process, the channel selection circuit 106 can detect whether the battery 101 enters the protection state through the status indication signal, thereby controlling the charging path of the terminal device.

[0103] The charging path is controlled by the combination of the first load switch 61 and the second load switch 62, so that the performance of low impedance and high current of the charging path can be ensured.

[0104] Among them, MOS refers to Metal-Oxide-Semiconductor Field-Effect Transistor, abbreviated as Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or Field Effect Transistor, and MOS is the abbreviation of MOSFET.

[0105] In a possible implementation, the MOS may be an N-metal-oxide-semiconductor (NMOS), Figure 4 NMOS is taken as an example.

[0106] The inverter can be realized by NMOS, and its characteristics such as high current carrying capacity and low on-resistance can be utilized to improve circuit reliability and reduce failure rate. In addition, the low power consumption of NMOS when turned on can save energy.

[0107] Next, how the voltage detection circuit 103 determines whether the battery 101 is in the protection state and generates the state indication signal will be described.

[0108] Figure 5 A schematic diagram of the structure of a voltage detection circuit 103 provided in an embodiment of the present application is shown in FIG. Figure 5As shown, the voltage detection circuit 103 includes a voltage comparator 31, a second resistor R2 and a third resistor R3.

[0109] The first end of the second resistor R2 is grounded, the second end of the second resistor R2 is connected to the first end of the third resistor R3 via a second connection line, and the second end of the third resistor R3 is connected to the output end of the voltage adjustment component 102 .

[0110] A negative electrode of the voltage comparator 31 is connected to the second connection line, and a positive electrode of the voltage comparator 31 is connected to the positive electrode of the battery 101 .

[0111] Depend on Figure 5 It can be seen that the reference voltage is obtained by dividing the second resistor R2 and the third resistor R3, for example, the reference voltage can be 2.5 V. The output end of the voltage comparator 31 is connected to the auxiliary charging chip 105 and the gate of the MOS respectively. The output end of the voltage comparator 31 can output a state indication signal.

[0112] In a possible implementation, when the output voltage of the battery 101 is above the reference voltage, the state indication signal is at a high level, so that the state indication signal indicates that the battery 101 is in a non-protection state.

[0113] When the output voltage of the battery 101 is less than the reference voltage, the state indication signal is at a low level, so that the state indication signal indicates that the battery is in a protection state.

[0114] That is, when the voltage comparator 31 detects that the output voltage of the battery 101 is above the reference voltage, the output status indication signal can be controlled to be a high level. When the voltage comparator 31 detects that the output voltage of the battery 101 is less than the reference voltage, the output status indication signal can be controlled to be a low level.

[0115] The channel selection circuit 106 can control the charging path of the terminal device 10 based on the high and low levels of the status indication signal.

[0116] In a possible implementation, the voltage adjustment component 102 may be a DC to DC converter (DCDC) power chip. By reducing the voltage of the charging power source through the DCDC power chip, the voltage adjustment efficiency may be improved.

[0117] In a possible implementation, the voltage adjustment component 102 may be a low dropout regulator (LowDropout Regulator, LDO) voltage regulator chip, which can provide a suitable power supply for the voltage detection circuit by stepping down the voltage of the external power supply through the LDO voltage regulator chip. Figure 6 FIG. 1 is a schematic diagram of a voltage adjustment component 102 according to an example of the present application.

[0118] In one possible implementation, Figure 7 A schematic diagram of a voltage comparator 31 is shown in FIG. Figure 7 As shown, the non-inverting input terminal (+vs) of the voltage comparator 31 can be connected to the output terminal of the voltage adjustment component 102, and the inverting input terminal (-vs) of the voltage comparator 31 is grounded to provide power for the voltage comparator 31.

[0119] In one possible implementation, Figure 8 Schematic diagram of the first load switch 61 of the present application example, as shown in Figure 8 As shown, the power input pin (VIN) of the first load switch 61 is connected to the external power supply through the USB interface, and the power output pin (VOUT) of the first load switch 61 is connected to the auxiliary charging chip 105. Figure 4 Taking the NMOS as an example, the enable pin of the first load switch 61 can be connected to the drain of the MOS through the first connecting line, and an inverter is formed in conjunction with the pull-up resistor (the first resistor R1) and the output voltage of the voltage adjustment component 102, so that when the input end of the MOS is a high level, its output end is reversely controlled to be a low level. If the input end of the MOS is a low level, its output end is reversely controlled to be a high level.

[0120] In one possible implementation, Fig. 9 A schematic diagram of a second load switch 62 of the present application is shown as follows: Fig. 9 As shown, the power input pin (VIN) of the second load switch 62 is connected to the external power supply through the USB interface, and the power output pin (VOUT) of the second load switch 62 is connected to the main charging chip 104. The enable pin of the second load switch 62 can be connected to the output end of the voltage comparator 31.

[0121] Based on the above embodiments, Fig.10 A schematic diagram of the circuit structure of a terminal device 10 provided in an embodiment of the present application.

[0122] In a possible implementation, the auxiliary charging chip 105 is a charging chip without software driver, such as a DC-DC conversion chip, so that when the battery 101 is in a protection state and the terminal device 10 is plugged into a charger, the auxiliary charging chip 105 can charge the battery 101 through the main charging chip 104.

[0123] In the diagram of the embodiment of the present application, IN and VIN represent input terminals, OUT and VOUT represent output terminals, GND represents a ground pin, and EN represents an enable pin, that is, the voltage adjustment component 102 can only work when the input terminal is a high level signal. The grounding capacitor C in the above circuit diagram can effectively reduce noise and improve the reliability of the circuit.

[0124] In the embodiment of the present application, 1 in the circuit diagram represents the first end, and 2 represents the second end. Taking the first resistor R1 as an example, 1 of the first resistor R1 represents the first end of the first resistor R1, and 2 of the first resistor R1 represents the second end of the first resistor R1. The others are similar and will not be repeated here.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0126] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

[0127] In this application, "exemplary", "in some embodiments", "in other embodiments", etc. are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0128] In this application, the terms “of”, “corresponding, relevant”, “corresponding” and “associated” may sometimes be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are consistent.

Claims

1. A terminal device, characterized in that: include: a battery configured to provide electrical energy; A voltage adjustment component, whose input end is used to connect to an external power source, and the voltage adjustment component is configured to adjust the voltage of the external power source to a first voltage, wherein the first voltage is lower than the voltage of the external power source; a voltage detection circuit, connected to the battery and the voltage adjustment component respectively, and configured to output a state indication signal based on the output voltage of the battery and a reference voltage, wherein the state indication signal is used to indicate whether the battery is in a protection state, and the reference voltage is obtained based on the first voltage; A main charging chip, configured to distribute electric energy to various components of the terminal device based on the external power supply, and to charge the battery; an auxiliary charging chip, connected to the main charging chip and configured to charge the battery through the main charging chip; A channel selection circuit is connected to the voltage detection circuit, the main charging chip, the auxiliary charging chip and the external power supply respectively, and the channel selection circuit is configured as follows: When the terminal device is turned on, if the status indication signal indicates that the battery is in a protection state, the auxiliary charging chip is turned on, so that when the external power supply is turned on, the auxiliary charging chip charges the battery through the main charging chip; During the battery charging process, when the status indication signal indicates that the battery is in a non-protected state, the main charging chip is turned on, so that the battery and the main charging chip power the starting device of the terminal device based on the external power supply, so that the terminal device can start up normally.

2. The terminal device according to claim 1, characterized in that: The channel selection circuit includes a first load switch, a second load switch, a field effect transistor MOS and a first resistor; The gate of the MOS is connected to the output end of the voltage detection circuit, the drain of the MOS is connected to the enable port of the first load switch through a first connection line, and the source of the MOS is grounded; the first end of the first resistor is connected to the first connection line, and the second end of the first resistor is connected to the output end of the voltage adjustment component; the output end of the first load switch is connected to the auxiliary charging chip; the enable port of the second load switch is connected to the output end of the voltage detection circuit; and the output end of the second load switch is connected to the main charging chip; When the status indication signal indicates that the battery is in a protection state, the first load switch is turned on and the second load switch is turned off, so that the auxiliary charging chip is turned on; when the status indication signal indicates that the battery is in a non-protection state, the first load switch is turned off and the second load switch is turned on, so that the main charging chip is turned on.

3. The terminal device according to claim 1 or 2, characterized in that: The voltage detection circuit includes a voltage comparator, a second resistor and a third resistor; Wherein, the first end of the second resistor is grounded, the second end of the second resistor is connected to the first end of the third resistor through a second connecting line; the second end of the third resistor is connected to the output end of the voltage adjustment component; The negative electrode of the voltage comparator is connected to the second connecting line, and the positive electrode of the voltage comparator is connected to the positive electrode of the battery.

4. The terminal device according to claim 3, characterized in that: When the output voltage of the battery is above the reference voltage, the state indication signal is at a high level, so that the state indication signal indicates that the battery is in a non-protection state; When the output voltage of the battery is less than the reference voltage, the state indication signal is at a low level, so that the state indication signal indicates that the battery is in a protection state.

5. The terminal device according to claim 1, characterized in that: The voltage adjustment component is a low dropout linear regulator LDO voltage regulator chip.

6. The terminal device according to claim 1, characterized in that: The voltage adjustment component is a DC-DC power chip.

7. The terminal device according to claim 2, characterized in that: The MOS is NMOS.

8. The terminal device according to claim 1, characterized in that: The input end of the voltage adjustment component is a universal serial bus USB interface.

9. The terminal device according to claim 8, characterized in that: The terminal device is a virtual reality VR device or a mobile terminal device.

10. A terminal device, characterized in that: include: a battery configured to provide electrical energy; A main charging chip connected to the battery, configured to distribute power to the battery and various components of the terminal device based on an external power source; an auxiliary charging chip connected to the main charging chip, configured to charge the battery through the main charging chip; The power supply control circuit connected to the external power source, the battery, the main charging chip and the auxiliary charging chip respectively is configured as follows: When the battery is not in the protection state, the main charging chip distributes electric energy to various components of the terminal device based on the external power supply, and charges the battery; When the battery is in a protection state, the battery is charged through the auxiliary charging chip; and during the battery charging process, if the battery enters an unprotected state, the starting device of the terminal device is powered by the main charging chip and the battery to enable the terminal device to start up normally.

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