Mobile terminal and battery protection circuit thereof

Abstract

The utility model discloses a mobile terminal and a battery protection circuit thereof, the mobile terminal is provided with an SIM card socket, the SIM card socket comprises an SIM card detection pin, the battery protection circuit comprises a power supply switch circuit, the control end of the power supply switch circuit is connected with the SIM card detection pin, the input end of the power supply switch circuit is connected with a battery, and the control end of the power supply switch circuit is connected with the SIM card detection pin. The output end of the power supply switch circuit is connected with a power supply loop of the mobile terminal, and the power supply switch circuit is switched on after an SIM card is inserted into the SIM card socket, so that the battery is connected to the power supply loop. Therefore, the SIM card socket is used as a switch to control the on-off of the battery, so that the SIM card is pulled out to avoid natural discharge of the battery when the mobile terminal is idle for a long time, and the SIM card is inserted to restore power supply of the battery when the mobile terminal is restarted, thereby effectively avoiding the situation that the mobile terminal cannot be started up due to triggering of low-voltage protection when the mobile terminal is idle for a long time, and improving the safety of the mobile terminal. It is ensured that the mobile terminal can still be stably started after being idle for a long time, and the user experience is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery protection circuit technology, and more particularly to a battery protection circuit for a mobile terminal and the mobile terminal itself. Background Technology

[0002] Electronic products with communication functions and batteries often experience prolonged natural battery discharge when left unused by customers for extended periods. This can trigger the battery's low-voltage protection, and in severe cases, may even render the electronic product unusable, requiring the battery to be reactivated before it can be turned on.

[0003] Currently, the common practice is to add mechanical switches to the hardware of electronic products to control the power supply, or to design replaceable batteries. However, the problem with these technologies is that adding mechanical switches or designing replaceable batteries increases design costs and complexity, and human error such as forgetting to operate the mechanical switch or removing the battery can easily occur, causing the electronic product to fail to power on and affecting the user experience. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art. Therefore, the first objective of this utility model is to provide a battery protection circuit for a mobile terminal, which can effectively prevent the mobile terminal from triggering low-voltage protection and failing to power on when it is idle for a long time, ensuring that the mobile terminal can still be stably powered on after long-term idleness, thus improving the user experience.

[0005] The second objective of this invention is to provide a mobile terminal.

[0006] To achieve the above objectives, the first aspect of this utility model proposes a battery protection circuit for a mobile terminal. The mobile terminal is equipped with a SIM card socket, which includes a SIM card detection pin. The battery protection circuit includes a power supply switch circuit. The control terminal of the power supply switch circuit is connected to the SIM card detection pin, the input terminal of the power supply switch circuit is connected to the battery, and the output terminal of the power supply switch circuit is connected to the power supply circuit of the mobile terminal. The power supply switch circuit is turned on after a SIM card is inserted into the SIM card socket, so that the battery is connected to the power supply circuit.

[0007] According to the battery protection circuit of the mobile terminal of this utility model, the SIM card socket is used as a switch to control the on and off of the battery. When the mobile terminal is idle for a long time, the SIM card can be removed to prevent the battery from discharging naturally. When the mobile terminal is restarted, the SIM card can be inserted to restore the battery power. Thus, the situation of the mobile terminal failing to turn on due to low voltage protection when it is idle for a long time is effectively avoided, ensuring that the mobile terminal can still be turned on stably after long-term idleness, and improving the user experience.

[0008] In addition, the battery protection circuit of the mobile terminal described above according to this utility model may also have the following additional technical features:

[0009] In some examples of this utility model, the power supply switch circuit includes: a first electronic switch, the gate of the first electronic switch being connected to the SIM card detection pin, the source of the first electronic switch being connected to the battery, the drain of the first electronic switch being connected to the power supply circuit of the mobile terminal, and a resistor forming a voltage difference between the source and the control gate being connected between the source and the gate of the first electronic switch.

[0010] In some examples of this invention, the first electronic switch is a field-effect MOSFET.

[0011] In some examples of this utility model, the power supply switch circuit further includes: a voltage regulator capacitor, one end of which is connected to the drain of the first electronic switch, and the other end of which is grounded.

[0012] In some examples of this utility model, the battery protection circuit further includes: a power-on control circuit, the input terminal of which is connected to the output terminal of the power supply switch circuit, and the output terminal of which is connected to the CPU power-on detection pin.

[0013] In some examples of this utility model, the power-on control circuit includes: a first capacitor, one end of which is connected to the output terminal of the power supply switch circuit, wherein the first capacitor is charged after the power supply switch circuit is turned on; a voltage divider resistor, including a first voltage divider resistor and a second voltage divider resistor, one end of which is connected to the other end of the first capacitor and one end of the second voltage divider resistor respectively, and the other end of the first voltage divider resistor is grounded; a second electronic switch, the base of which is connected to the other end of the second voltage divider resistor, the collector of which is connected to the CPU power-on detection pin, and the emitter of which is grounded, wherein the power-on control circuit short-circuits the CPU power-on detection pin to ground after the second electronic switch is turned on.

[0014] In some examples of this invention, the second electronic switch is an NPN transistor.

[0015] In some examples of this invention, the power-on control circuit further includes: a Zener diode, the cathode of which is connected to the output terminal of the power supply switch circuit, and the anode of which is connected to one end of the first capacitor. The power-on control circuit conducts after the Zener diode reaches a preset forward voltage, allowing the battery to charge the first capacitor. In some examples of this invention, the power-on control circuit further includes: a push-button switch, one end of which is connected to the CPU power-on detection pin, and the other end of which is grounded. The CPU power-on detection pin is short-circuited to ground after the push-button switch is pressed.

[0016] To achieve the above objectives, a second aspect of this utility model provides a mobile terminal including the aforementioned battery protection circuit of the mobile terminal of this utility model.

[0017] According to the present invention, by adopting the aforementioned battery protection circuit of the mobile terminal, the situation where the mobile terminal cannot be turned on due to low voltage protection when it is idle for a long time can be effectively avoided, ensuring that the mobile terminal can still be turned on stably after being idle for a long time, thus improving the user experience.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a battery protection circuit according to an embodiment of the present invention;

[0020] Figure 2 This is an electrical schematic diagram of a battery protection circuit according to an embodiment of the present invention;

[0021] Figure 3 This is a block diagram of a mobile terminal according to an embodiment of the present invention. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] The following description, with reference to the accompanying drawings, describes the battery protection circuit of the mobile terminal and the mobile terminal according to embodiments of the present invention.

[0024] Figure 1 This is a schematic diagram of a battery protection circuit according to an embodiment of the present invention.

[0025] Specifically, in some examples of this utility model, reference is made to... Figure 1 As shown, the mobile terminal is equipped with a SIM card socket 100, which includes a SIM card detection pin. The battery protection circuit 200 includes a power supply switch circuit 210. The control terminal of the power supply switch circuit 210 is connected to the SIM card detection pin, the input terminal of the power supply switch circuit 210 is connected to the battery 300, and the output terminal of the power supply switch circuit 210 is connected to the power supply circuit of the mobile terminal. The power supply switch circuit 210 is turned on after a SIM card is inserted into the SIM card socket, so that the battery 300 is connected to the power supply circuit.

[0026] Specifically, in the above examples of this utility model, reference is made to... Figure 1 As shown, the SIM card socket 100 includes a SIM card detection pin 1 and a SIM card detection pin 2. The control terminal of the power supply switch circuit 210 is connected to the SIM card detection pin 1, the input terminal of the power supply switch circuit 210 is connected to the battery 300, and the output terminal of the power supply switch circuit 210 is connected to the power supply circuit of the mobile terminal. When a SIM card is inserted into the SIM card socket 100, the SIM card detection pins 1 and 2 are turned on, the control terminal of the power supply switch circuit 210 is grounded, and the input and output terminals of the power supply switch circuit 210 are turned on, connecting the battery 300 to the power supply circuit.

[0027] Therefore, in this example of the present invention, in the above embodiment, by setting a power supply switch circuit between the power supply circuit of the battery and the mobile terminal, and using the SIM card socket as a switch to control the on / off state of the battery, the SIM card can be removed when the mobile terminal is idle for a long time to prevent the battery from discharging naturally, and the SIM card can be inserted when the mobile terminal is restarted to restore the power supply to the battery. Thus, the situation where the mobile terminal cannot be turned on due to low voltage protection when it is idle for a long time is effectively avoided, ensuring that the mobile terminal can still be turned on stably after a long period of idleness, and improving the user experience.

[0028] Furthermore, in some examples of this utility model, reference is made to... Figure 1 As shown, the battery protection circuit 200 also includes a power-on control circuit 220, the input terminal of which is connected to the output terminal of the power supply switch circuit 210, and the output terminal of which is connected to the CPU power-on detection pin 400.

[0029] Specifically, in the above example of this utility model, the input terminal of the power-on control circuit 220 is turned on after the output voltage of the output terminal of the power supply switch circuit 210 reaches a preset threshold, thereby enabling the mobile terminal to power on automatically.

[0030] Furthermore, in some examples of this utility model, reference is made to... Figure 2 As shown, the power supply switch circuit 210 may include: a first electronic switch Q1, the gate of the first electronic switch Q1 is connected to the SIM card detection pin 1, the source of the first electronic switch Q1 is connected to the battery 300, and the drain of the first electronic switch Q1 is connected to the power supply circuit of the mobile terminal; a resistor R is connected between the source and the gate of the first electronic switch Q1 to form a voltage difference between the source and the control gate.

[0031] Optionally, in some examples of this invention, the first electronic switch Q1 is a field-effect MOSFET.

[0032] Specifically, in the above example of this utility model, when a SIM card is inserted into the mobile terminal, SIM card detection pin 1 and SIM card detection pin 2 are turned on. At this time, the gate of the first electronic switch Q1 is short-circuited to ground and becomes low voltage. The first electronic switch Q1 is turned on, so that the battery 300 is connected to the power supply circuit.

[0033] Furthermore, in some examples of this utility model, the power supply switch circuit 210 further includes a voltage regulator capacitor, one end of which is connected to the drain of the first electronic switch Q1.

[0034] Specifically, in the above example of this invention, a voltage-stabilizing capacitor is used to stabilize the output voltage of the entire power supply switching circuit.

[0035] Therefore, in this example of the present invention, in the above embodiment, by setting a first electronic switch between the power supply circuit of the battery and the mobile terminal, and using the SIM card socket as a switch to control the on / off state of the battery, the SIM card can be removed when the mobile terminal is idle for a long time to prevent the battery from discharging naturally, and the SIM card can be inserted when the mobile terminal is restarted to restore the power supply to the battery. Thus, the situation where the mobile terminal cannot be turned on due to low voltage protection when it is idle for a long time is effectively avoided, ensuring that the mobile terminal can still be turned on stably after a long period of idleness, and improving the user experience.

[0036] Furthermore, in some examples of this utility model, reference is made to... Figure 2 As shown, the power-on control circuit 220 includes: a first capacitor C1, one end of which is connected to the output terminal of the power supply switch circuit 210; a voltage divider resistor, including a first voltage divider resistor R1 and a second voltage divider resistor R2, one end of the first voltage divider resistor R1 being connected to the other end of the first capacitor C1 and one end of the second voltage divider resistor R2 respectively, and the other end of the first voltage divider resistor being grounded; a second electronic switch Q2, the base of the second electronic switch Q2 being connected to the other end of the second voltage divider resistor R2, the collector of the second electronic switch Q2 being connected to the CPU power-on detection pin 400, and the emitter of the second electronic switch Q2 being grounded.

[0037] Optionally, in some examples of this invention, the second electronic switch Q2 is an NPN transistor.

[0038] Specifically, in the above example of this utility model, after the power supply switch circuit 210 is turned on, the battery 300 charges the first capacitor C1. At the instant the first capacitor C1 is charged, the capacitor voltage is divided by the first voltage divider resistor R1 and the second voltage divider resistor R2 to the base of the second electronic switch Q2. At this time, the base of the second electronic switch Q2 becomes high level, the collector and emitter of the second electronic switch Q2 are turned on, and the CPU power-on detection pin 400 becomes low level through the second electronic switch Q2 short-circuiting to ground, so that the mobile terminal is automatically turned on.

[0039] Furthermore, in some examples of this utility model, reference is made to... Figure 2 As shown, the power-on control circuit 220 also includes a Zener diode D, the cathode of which is connected to the output terminal of the power supply switch circuit 210, and the anode of which is connected to one end of the first capacitor C1.

[0040] Specifically, in the above example of this utility model, the Zener diode D conducts when the voltage reaches 3.5V to ensure that the mobile terminal performs the power-on action only after the power-on voltage is met, thereby ensuring that the mobile terminal powers on smoothly.

[0041] Furthermore, in some examples of this utility model, reference is made to... Figure 2 As shown, the power-on control circuit 220 also includes a push-button switch K, one end of which is connected to the CPU power-on detection pin 400, and the other end of which is grounded.

[0042] Specifically, in the above example of this utility model, when the user presses the button switch K, the CPU power-on detection pin 400 is short-circuited to ground and becomes low level. Thus, the user controls the grounding time of the CPU power-on detection pin 400 through the button switch K to realize the manual power-on and power-off of the mobile terminal.

[0043] Therefore, in this example of the present invention, on the one hand, a second electronic switch Q2 is set at the control terminal of the CPU power-on detection pin 400, so that when the battery is connected, the second electronic switch Q2 is briefly turned on by the Zener diode D and the first capacitor C1, so that the mobile terminal is automatically powered on after the CPU power-on detection pin 400 is grounded. On the other hand, a button switch K is set at the control terminal of the CPU power-on detection pin 400, so that the user can manually power on and off the mobile terminal by pressing the button switch K to adjust the grounding time of the CPU power-on detection pin 400. Thus, not only is it ensured that the mobile terminal can still be stably powered on after a long period of inactivity, but it also provides multiple power-on methods, further improving the user experience.

[0044] In summary, the battery protection circuit of the mobile terminal according to this utility model uses the SIM card socket as a switch to control the battery's on / off state. When the mobile terminal is idle for a long time, the SIM card can be removed to prevent the battery from discharging naturally, and when the mobile terminal is restarted, the SIM card can be inserted to restore power to the battery. Thus, it effectively avoids the situation where the mobile terminal cannot be turned on due to low voltage protection when it is idle for a long time, ensuring that the mobile terminal can still be turned on stably after long-term idleness, thereby improving the user experience.

[0045] Figure 3 This is a block diagram of an electronic device according to an embodiment of the present invention.

[0046] Specifically, in some examples of this utility model, reference is made to... Figure 3 As shown, the electronic device 1000 includes the battery protection circuit 200 of the mobile terminal described in the above-mentioned example of the present invention.

[0047] It should be understood that the specific implementation of the electronic device 1000 of this utility model can be referred to the specific implementation of the battery protection circuit 200 of the mobile terminal in the above-mentioned example of this utility model. In order to reduce redundancy, it will not be described again here.

[0048] In summary, the mobile terminal according to this utility model, by adopting the aforementioned battery protection circuit, can effectively avoid the situation where the mobile terminal cannot be turned on due to low voltage protection when it is idle for a long time, ensuring that the mobile terminal can still be turned on stably after being idle for a long time, thus improving the user experience.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A battery protection circuit for a mobile terminal, characterized in that, The mobile terminal is equipped with a SIM card socket, which includes a SIM card detection pin. The battery protection circuit includes a power supply switch circuit. The control terminal of the power supply switch circuit is connected to the SIM card detection pin, the input terminal of the power supply switch circuit is connected to the battery, and the output terminal of the power supply switch circuit is connected to the power supply circuit of the mobile terminal. The power supply switch circuit is turned on after a SIM card is inserted into the SIM card socket, so that the battery is connected to the power supply circuit.

2. The battery protection circuit for a mobile terminal according to claim 1, characterized in that, The power supply switch circuit includes: a first electronic switch, the gate of the first electronic switch being connected to the SIM card detection pin, the source of the first electronic switch being connected to the battery, the drain of the first electronic switch being connected to the power supply circuit of the mobile terminal, and a resistor forming a voltage difference between the source and the control gate being connected between the source and the gate of the first electronic switch.

3. The battery protection circuit for a mobile terminal according to claim 2, characterized in that, The first electronic switch is a field-effect MOSFET.

4. The battery protection circuit of the mobile terminal according to any one of claims 2-3, characterized in that, The power supply switch circuit further includes a voltage regulator capacitor, one end of which is connected to the drain of the first electronic switch, and the other end of which is grounded.

5. The battery protection circuit for a mobile terminal according to claim 1, characterized in that, The battery protection circuit also includes a power-on control circuit. The input terminal of the power-on control circuit is connected to the output terminal of the power supply switch circuit, and the output terminal of the power-on control circuit is connected to the CPU power-on detection pin.

6. The battery protection circuit for a mobile terminal according to claim 5, characterized in that, The power-on control circuit includes: A first capacitor, one end of which is connected to the output terminal of the power supply switch circuit, wherein the first capacitor is charged after the power supply switch circuit is turned on. The voltage divider resistor includes a first voltage divider resistor and a second voltage divider resistor. One end of the first voltage divider resistor is connected to the other end of the first capacitor and one end of the second voltage divider resistor, respectively. The other end of the first voltage divider resistor is grounded. The second electronic switch has its base connected to the other end of the second voltage divider resistor, its collector connected to the CPU power-on detection pin, and its emitter grounded. The power-on control circuit short-circuits the CPU power-on detection pin to ground after the second electronic switch is turned on.

7. The battery protection circuit for a mobile terminal according to claim 6, characterized in that, The second electronic switch is an NPN transistor.

8. The battery protection circuit for a mobile terminal according to claim 6, characterized in that, The power-on control circuit further includes a Zener diode, the cathode of which is connected to the output terminal of the power supply switch circuit, and the anode of which is connected to one end of the first capacitor. The power-on control circuit turns on the Zener diode after it reaches a preset on-state voltage, thereby enabling the battery to charge the first capacitor.

9. The battery protection circuit of the mobile terminal according to any one of claims 5-8, characterized in that, The power-on control circuit includes a push-button switch, one end of which is connected to the CPU power-on detection pin, and the other end of which is grounded. The CPU power-on detection pin is short-circuited to ground after the push-button switch is pressed.

10. A mobile terminal, characterized in that, The mobile terminal includes the battery protection circuit of the mobile terminal as described in any one of claims 1-9.

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