CN204304543U - A kind of power protecting circuit and terminal - Google Patents

Abstract

The utility model discloses a power protection circuit and a terminal. The power protection circuit includes a charging interface module, a power management module, a battery interface module and a switch module. The switch module at least includes a control terminal, an input terminal and an output terminal; the input terminal of the switch module Connect the charging interface module, the output end of the switch module is connected to one end of the power management module, the control end of the switch module is connected to the other end of the power management module, and the power management module is also connected to the battery interface module; when the battery interface module is not connected to the battery, the switch module The input terminal of the switch module is disconnected from the output terminal; when the battery interface module is connected to the battery, the input terminal of the switch module is connected to the output terminal. The above solution can cut off the connection between the charging interface module and the power management module when the terminal is not connected to the battery and is connected to the power supply through the charging interface module, thereby preventing the power supply from burning the power management module.

Description

A power supply protection circuit and terminal

technical field

The utility model relates to the communication field, in particular to a power protection circuit and a terminal.

Background technique

Currently, some mobile terminals on the market do not support power supply for the mobile terminal directly through a charger without a battery.

As shown in FIG. 1 , FIG. 1 is a partial structural diagram of a mobile terminal provided in the prior art. The mobile terminal includes a charging interface module 110 , a power management module 120 , a control module 130 and a battery interface module 140 . The charging interface module 110 is connected to the power management module 120 and the control module 130 respectively, and the power management module 120 is also connected to the control module 130 and the battery interface module 140 respectively. The charging interface module 110 is used to charge the battery connected to the battery interface module 140 through the power management module 120, so that the battery interface module 140 provides trigger power for the power management module 120, thereby enabling the power management module 120 to work normally, and providing the control module 130 provides power. The charging interface module 110 is also used to communicate with the control module 130 for data transmission, so that the control module 130 controls the mobile terminal to realize various preset functions.

However, when the user directly connects the charger to the mobile terminal through the charging interface module 110 without loading the battery, the inherent power-on logic of the power management module 120 may be destroyed, which may cause the power management module 120 to be burned.

Utility model content

The utility model provides a power supply protection circuit and a terminal, which can prevent the power supply from destroying the inherent power-on logic of the circuit and prevent the power supply from burning the terminal when the terminal not connected to the battery is connected to the power supply.

The first aspect of the utility model provides a power supply protection circuit, including a charging interface module, a power management module, and a battery interface module, wherein the circuit also includes a switch module, and the switch module includes at least a control terminal, an input terminal, and an output terminal The input end of the switch module is connected to the charging interface module, the output end of the switch module is connected to one end of the power management module, the control end of the switch module is connected to the other end of the power management module, and the The power management module is also connected to the battery interface module; when the battery interface module is not connected to the battery, the input terminal of the switch module is disconnected from the output terminal of the switch module; when the battery interface module is connected to the battery The input end of the switch module is connected to the output end of the switch module, and the charging interface module is connected to the power management module through the switch module.

With reference to the first aspect, in a first possible implementation manner of the first aspect of the present invention, the control terminal is further connected to the battery interface module.

With reference to the first aspect, in the second possible implementation manner of the first aspect of the present invention, when the power management module detects that the battery interface module is not connected to the battery, the power management module sends the control terminal outputs a low level, and controls the input terminal to be disconnected from the output terminal; when the power management module detects that the battery interface module is connected to the battery, the power management module outputs to the control terminal High level, controlling the input terminal to establish a connection with the output terminal.

With reference to the first possible implementation manner of the first aspect, in the third possible implementation manner of the first aspect of the present invention, when the control terminal detects that the battery interface module is not connected to the battery, the The input end is disconnected from the output end; when the control end detects that the battery interface module is connected to the battery, the input end is connected to the output end.

With reference to the first aspect or any of the above possible implementation manners, in a fourth possible implementation manner of the first aspect of the present invention, the switch module is an N-type field effect transistor.

With reference to the fourth possible implementation manner of the first aspect, in the fifth possible implementation manner of the first aspect of the present invention, the N-type field effect transistor includes a gate, a source and a drain, and the gate is The control terminal, the source is the input terminal, and the drain is the output terminal.

With reference to the first aspect or one of the above-mentioned first to fourth possible implementation manners, in a sixth possible implementation manner of the first aspect of the present invention, the switch module is an electronic analog switch.

With reference to the second or third possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect of the present invention, the voltage range value of the low level is greater than zero and less than 3V.

With reference to the second or third possible implementation manner of the first aspect, in the eighth possible implementation manner of the first aspect of the present invention, the voltage range value of the high level is greater than or equal to 3V and less than or equal to 6V.

The first aspect of the utility model provides a terminal, including a processor and a memory, wherein the terminal further includes the power protection circuit described in any one of the above, and the power protection circuit is respectively connected to the processor and the memory .

In the above solution, by adding a switch module between the charging interface module and the power management module, when the terminal is not connected to the battery and is connected to the power supply through the charging interface module, the connection between the charging interface module and the power management module can be cut off, thereby preventing the power supply from burning out Power management module.

Description of drawings

FIG. 1 is a partial structural diagram of a mobile terminal provided in the prior art;

Fig. 2 is a schematic structural diagram of a power supply protection circuit provided by an embodiment of the present invention;

Fig. 3 is a circuit structure diagram of a power supply protection circuit provided by an embodiment of the present invention;

Fig. 4 is a circuit structure diagram in which the switch module in the power supply protection circuit of Fig. 3 is an N-type field effect transistor;

Fig. 5 is a circuit structure diagram in which the switch module in the power supply protection circuit of Fig. 3 is an electronic analog switch;

Fig. 6 is a schematic structural diagram of another power supply protection circuit provided by an embodiment of the present invention;

Fig. 7 is a circuit structure diagram of another power supply protection circuit provided by the embodiment of the present invention;

Fig. 8 is a circuit structure diagram in which the switch module in the power supply protection circuit of Fig. 7 is an N-type field effect transistor;

Fig. 9 is a circuit structure diagram in which the switch module in the power supply protection circuit of Fig. 7 is an electronic analog switch;

Fig. 10 is a schematic diagram of a partial structure of a terminal provided by an embodiment of the present invention.

Detailed ways

In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures, interfaces, and technologies are presented for a thorough understanding of the present invention.

Please refer to FIG. 2 . FIG. 2 is a schematic structural diagram of a power supply protection circuit provided by an embodiment of the present invention. The power supply protection circuit provided in this embodiment is applied to terminals based on the MTK platform, but is not limited thereto, and may also be applied to terminals based on other platforms in other embodiments.

The terminal in this embodiment includes a charging interface module 210 , a switch module 220 , a power management module 230 and a battery interface module 240 , wherein the switch module 220 includes at least an input terminal 221 , an output terminal 222 and a control terminal 223 . It can be understood that the power supply protection circuit may also include many other devices, which will not be described here.

The input terminal 221 of the switch module 220 is connected to the charging interface module 210, the output terminal 222 of the switch module 220 is connected to one end of the power management module 230, the control terminal 223 of the switch module 220 is connected to the other end of the power management module 230, and the power management module 230 is also connected to battery interface module 240 .

Wherein, the charging interface module 210 is used for inputting a power signal to the input terminal 221 of the switch module 220 . The control terminal 223 of the switch module 220 is used to control the on and off of the switch module 220 according to the signal output by the power management module 230 .

The battery interface module 240 is used to connect the battery and provide trigger voltage for the power management module 230, so that the power management module 230 can provide power for the components in the circuit that need power supply, so that the circuit can work normally.

When the battery interface module 240 is not connected to a battery, the input terminal 221 of the switch module 220 is disconnected from the output terminal 222 of the switch module 220 .

When the battery interface module 240 is connected to the battery, the input terminal 221 of the switch module 220 is connected to the output terminal 222 of the switch module 220 , and the charging interface module 210 is connected to the power management module 230 through the switch module 220 .

Specifically, please refer to FIG. 3 . FIG. 3 is a circuit structure diagram of a power supply protection circuit provided by an embodiment of the present invention.

The input terminal 221 of the switch module 220 is connected to the power supply port VUSB of the charging interface module 210, the output terminal 222 of the switch module 220 is connected to the charging port VUSB of the power management module 230, and the control terminal 223 of the switch module 220 is connected to the data port 1 of the power management module 230. /O, the trigger power port VBAT of the power management module 230 is connected to the power port VBAT of the battery interface module 240 . The ground port GND of the charging interface module 210 , the ground port GND of the power management module 230 and the ground port of the battery interface module 240 are respectively grounded.

Wherein, the power port VUSB of the charging interface module 210 is used to input a power signal to the input terminal 221 of the switch module 220 . The control terminal 223 of the switch module 220 is used to control the disconnection and connection of the input terminal 222 and the output terminal 223 of the switch module 220 according to the signal output by the data port I/O of the power management module 230 .

The battery interface module 240 is used to connect the battery, and provides the trigger voltage for the power management module 230 through the power port VBAT and the ground port GND, so that the power management module 230 can provide power for the parts that need power supply in the circuit through the output power port VCC, so that Terminal works fine.

The power management module 230 detects the voltage value of the trigger power port VBAT in real time, so as to determine whether the battery interface module 240 is connected to a battery. Wherein, when the power management module 230 detects that the voltage value of the trigger power port VBAT is lower than the first preset threshold, it recognizes that the battery interface module 240 is not connected to the battery. When the power management module 230 detects that the voltage value of the trigger power port VBAT is greater than or equal to the first preset threshold, it recognizes that the battery interface module 240 is connected to a battery.

Wherein, the first preset threshold may be the minimum value of the battery. Since the minimum value of the output voltage of the mobile terminal is not less than 3.2V when the battery power is insufficient and automatically shuts down, in this embodiment, the first preset threshold value may be 3.2V, but it is not limited thereto, and may also be based on The actual situation sets the first preset threshold (the first preset threshold is smaller than the maximum value of the battery) to other values, which is not limited here.

When the power management module 230 detects that the battery interface module 240 is not connected to the battery, the power management module 230 outputs a low level to the control terminal 223 of the switch module 220, and controls the input terminal 221 of the switch module 220 to be disconnected from the output terminal 222 of the switch module 220. Open the connection to cut off the connection between the charging interface module 210 and the power management module 230, thereby preventing the external power supply from destroying the inherent power-on logic of the power management module 230 when the charging interface module 210 is connected to the power supply and preventing the power from damaging the power management module 230 or even Damage to other circuits connected to the power management module 230 .

When the power management module 230 detects that the battery interface module 240 is connected to the battery, the power management module 230 outputs a high level to the control terminal 223 of the switch module 220, and controls the input terminal 221 of the switch module 220 to establish a connection with the output terminal 222 of the switch module 220 , the charging interface module 210 establishes a connection with the power management module 230 through the switch module 220 .

When the charging interface module 210 is powered on, the power management module 230 charges the battery connected to the battery interface module 240 according to the power signal transmitted by the power port VUSB of the charging interface module 210 . When the power management module 230 detects that the voltage value of the trigger power supply port VBAT is greater than or equal to the second preset threshold, the power supply signal is output to the circuit connected to the power management module 230 through the output power supply port VCC, so that the circuit connected to the power management module 230 The circuit can work normally, so that the terminal can realize various preset functions.

Wherein, the second preset threshold is larger than the first preset threshold and smaller than the maximum voltage value allowed by the battery.

When the power management module 230 detects that the voltage value of the trigger power port VBAT is equal to the maximum voltage value allowed by the battery, it controls the battery interface module 240 to stop charging the battery. Wherein, in this embodiment, the maximum voltage value of the battery is 4.2V.

When the power management module 230 detects that the voltage value of the trigger power supply port VBAT is less than the third preset threshold, it outputs a high level to the control terminal 223 of the switch module 220, and controls the input terminal 221 of the switch module 220 and the output terminal of the switch module 220 222 to establish a connection, the charging interface module 210 and the power management module 230 establish a connection through the switch module 220, so that the power management module 230 charges the battery connected to the battery interface module 240 according to the power signal transmitted by the power port VUSB of the charging interface module 210. Wherein, the third preset threshold is greater than or equal to the second preset threshold and less than or equal to the maximum voltage of the battery. The third preset threshold may be a rated voltage value of the battery. In this embodiment, the rated voltage of the battery is 3.7V.

Wherein, the maximum value of the low-level voltage range value is less than the first preset threshold value, the minimum value of the high-level voltage range value is less than or equal to the first preset threshold value, and the maximum value of the low-level voltage range value is less than The minimum value of the voltage range value for high level.

In this embodiment, the voltage range value of the low level is greater than zero and less than 3V, and the voltage range value of the high level is greater than or equal to 3V and less than or equal to 6V. But it is not limited thereto. In other embodiments, the range values of the low level and the high level may be set according to actual conditions.

In the above solution, by adding a switch module between the charging interface module and the power management module, it is possible to know whether the terminal is connected to the battery, and when the terminal without the battery is connected to the power supply through the charging interface module, the charging interface module and the power management module can be cut off. module connection, thereby preventing the power supply from burning the power management module.

Please refer to FIG. 4 . FIG. 4 is a circuit structure diagram in which the switch module in the power protection circuit of FIG. 3 is an N-type field effect transistor.

As shown in FIG. 4 , the switch module 220 is an N-type field effect transistor. Wherein, the N-type field effect transistor includes a gate g, a source d and a drain s, the gate g is the control terminal 223 , the source d is the input terminal 221 , and the drain s is the output terminal 222 .

The power management module 230 detects the voltage value of the trigger power port VBAT in real time, so as to determine whether the battery interface module 240 is connected to a battery. Wherein, when the power management module 230 detects that the voltage value of the trigger power port VBAT is lower than the first preset threshold, it recognizes that the battery interface module 240 is not connected to the battery. When the power management module 230 detects that the voltage value of the trigger power port VBAT is greater than or equal to the first preset threshold, it recognizes that the battery interface module 240 is connected to a battery.

Wherein, the first preset threshold is the minimum value of the battery. Since the minimum value of the output voltage of the mobile terminal is not less than 3.2V when the battery power is insufficient and automatically shuts down, in this embodiment, the first preset threshold value is 3.2V, but it is not limited thereto, and it can also be determined according to the actual situation. In some cases, set the first preset threshold (the first preset threshold is smaller than the maximum value of the battery) to other values, which is not limited here.

When the power management module 230 detects that the battery interface module 240 is not connected to the battery, the power management module 230 outputs a low level to the gate 223 of the N-type field effect transistor 220, and controls the N-type field effect transistor 220 to cut off, that is, the N-type field effect transistor 220 is turned off. The source 221 of the effect transistor 220 is disconnected from the drain 222 of the N-type field effect transistor 220 to cut off the connection between the charging interface module 210 and the power management module 230, thereby preventing the external power supply from being connected to the charging interface module 210 Destroying the inherent power-on logic of the power management module 230 and preventing the power from damaging the power management module 230 and even other circuits connected to the power management module 230 .

When the power management module 230 detects that the battery interface module 240 is connected to the battery, the power management module 230 outputs a high level to the grid 223 of the N-type field effect transistor 220, and controls the N-type field effect transistor 220 to be turned on, that is, the N-type field effect transistor 220 is turned on. The source 221 of the effect transistor 220 is connected to the drain 222 of the N-type field effect transistor 220 , and the charging interface module 210 is connected to the power management module 230 through the N-type field effect transistor 220 .

When the charging interface module 210 is powered on, the power management module 230 charges the battery connected to the battery interface module 240 according to the power signal transmitted by the power port VUSB of the charging interface module 210 . When the power management module 230 detects that the voltage value of the trigger power supply port VBAT is greater than or equal to the second preset threshold value, it provides power to the circuit control module 250 connected to the power management module 230 through the output power supply port VCC, so that it can be connected with the power management module. The circuit connected to 230 can work normally, so that the terminal can realize various preset functions.

Wherein, the second preset threshold is larger than the first preset threshold and smaller than the maximum voltage value allowed by the battery.

When the power management module 230 detects that the voltage value of the trigger power port VBAT is equal to the maximum voltage value allowed by the battery, it controls the battery interface module 240 to stop charging the battery. Wherein, in this embodiment, the maximum voltage value of the battery is 4.2V.

When the power management module 230 detects that the voltage value of the trigger power supply port VBAT is less than the third preset threshold, it outputs a high level to the gate 223 of the N-type field effect transistor 220, and controls the source 221 of the N-type field effect transistor 220220 and The drain 222 of the N-type field effect transistor 220 establishes a connection, and the charging interface module 210 and the power management module 230 establish a connection through the N-type field effect transistor 220, so that the power management module 230 transmits the power according to the power port VUSB of the charging interface module 210 The signal charges the battery connected to the battery interface module 240 . Wherein, the third preset threshold is greater than or equal to the second preset threshold and less than or equal to the maximum voltage of the battery. The third preset threshold may be a rated voltage value of the battery. In this embodiment, the rated voltage of the battery is 3.7V.

Wherein, the maximum value of the low-level voltage range value is less than the first preset threshold value, the minimum value of the high-level voltage range value is less than or equal to the first preset threshold value, and the maximum value of the low-level voltage range value is less than The minimum value of the voltage range value for high level.

In this embodiment, the voltage range value of the low level is greater than zero and less than 3V, and the voltage range value of the high level is greater than or equal to 3V and less than or equal to 6V. But it is not limited thereto. In other embodiments, the range values of the low level and the high level may be set according to actual conditions.

In the above solution, by adding an N-type field effect transistor between the charging interface module and the power management module, when the terminal not connected to the battery is connected to the power supply through the charging interface module, the connection between the charging interface module and the power management module can be cut off, and then Prevent the power supply from burning out the power management module.

Please refer to FIG. 5 . FIG. 5 is a circuit structure diagram in which the switch module in the power protection circuit of FIG. 3 is an electronic analog switch.

As shown in FIG. 5 , the switch module 220 is an electronic analog switch. Wherein, the electronic analog switch at least includes an input terminal 221 , an output terminal 222 and a control terminal 223 . The electronic analog switch can be a single-pole single-throw switch, a single-pole double-throw switch, or a single-pole multiple throw switch.

When the charging interface module 210 is powered on, the power management module 230 detects the voltage value of the trigger power port VBAT in real time, so as to determine whether the battery interface module 240 is connected to a battery. Wherein, when the power management module 230 detects that the voltage value of the trigger power port VBAT is lower than the first preset threshold, it recognizes that the battery interface module 240 is not connected to the battery. When the power management module 230 detects that the voltage value of the trigger power port VBAT is greater than or equal to the first preset threshold, it recognizes that the battery interface module 240 is connected to a battery.

Wherein, the first preset threshold is the minimum value of the battery. Since the minimum value of the output voltage of the mobile terminal is not less than 3.2V when the battery power is insufficient and automatically shuts down, in this embodiment, the first preset threshold value is 3.2V, but it is not limited thereto, and it can also be determined according to the actual situation. In some cases, set the first preset threshold (the first preset threshold is smaller than the maximum value of the battery) to other values, which is not limited here.

When the power management module 230 detects that the battery interface module 240 is not connected to the battery, the power management module 230 outputs a low level to the control terminal 223 of the electronic analog switch 220 to control the input terminal 221 of the electronic analog switch 220 and the output of the electronic analog switch 220 Terminal 222 is disconnected to cut off the connection between the charging interface module 210 and the power management module 230, thereby preventing the external power supply from destroying the inherent power-on logic of the power management module 230 when the charging interface module 210 is connected to the power supply and preventing the power supply from damaging the power management The module 230 even damages other circuits connected to the power management module 230 .

When the power management module 230 detects that the battery interface module 240 is connected to the battery, the power management module 230 outputs a high level to the control terminal 223 of the electronic analog switch 220 to control the input terminal 221 of the electronic analog switch 220 and the output terminal of the electronic analog switch 220 222 to establish a connection, the charging interface module 210 and the power management module 230 establish a connection through the electronic analog switch 220 .

When the charging interface module 210 is powered on, the power management module 230 charges the battery connected to the battery interface module 240 according to the power signal transmitted by the power port VUSB of the charging interface module 210 . When the power management module 230 detects that the voltage value of the trigger power supply port VBAT is greater than or equal to the second preset threshold, the power supply signal is output to the circuit connected to the power management module 230 through the output power supply port VCC, so that the circuit connected to the power management module 230 The circuit can work normally, so that the terminal can be controlled to realize various preset functions.

Wherein, the second preset threshold is larger than the first preset threshold and smaller than the maximum voltage value allowed by the battery.

When the power management module 230 detects that the voltage value of the trigger power port VBAT is equal to the maximum voltage value allowed by the battery, it controls the battery interface module 240 to stop charging the battery. Wherein, in this embodiment, the maximum voltage value of the battery is 4.2V.

When the power management module 230 detects that the voltage value of the trigger power supply port VBAT is less than the third preset threshold, it outputs a high level to the control terminal 223 of the electronic analog switch 220 to control the input terminal 221 of the electronic analog switch 220 and the switch module 220. The output terminal 222 establishes a connection, and the charging interface module 210 and the power management module 230 establish a connection through the electronic analog switch 220, so that the power management module 230 supplies the battery connected to the battery interface module 240 according to the power signal transmitted by the power port VUSB of the charging interface module 210. Charge. Wherein, the third preset threshold is greater than or equal to the second preset threshold and less than or equal to the maximum voltage of the battery. The third preset threshold may be a rated voltage value of the battery. In this embodiment, the rated voltage of the battery is 3.7V.

Wherein, the maximum value of the low-level voltage range value is less than the first preset threshold value, the minimum value of the high-level voltage range value is less than or equal to the first preset threshold value, and the maximum value of the low-level voltage range value is less than The minimum value of the voltage range value for high level.

In this embodiment, the voltage range value of the low level is greater than zero and less than 3V, and the voltage range value of the high level is greater than or equal to 3V and less than or equal to 6V. But it is not limited thereto. In other embodiments, the range values of the low level and the high level may be set according to actual conditions.

The above solution, by adding an electronic analog switch between the charging interface module and the power management module, can cut off the connection between the charging interface module and the power management module when the terminal not connected to the battery is connected to the power supply through the charging interface module, thereby preventing the power from Burn out the power management module.

Please refer to FIG. 6 . FIG. 6 is a schematic structural diagram of another power supply protection circuit provided by an embodiment of the present invention. The power supply protection circuit provided in this embodiment is applied to terminals based on the MTK platform, but is not limited thereto, and may also be applied to terminals based on other platforms in other embodiments.

The terminal in this embodiment includes a charging interface module 210 , a switch module 220 , a power management module 230 and a battery interface module 240 , wherein the switch module 220 includes at least an input terminal 221 , an output terminal 222 and a control terminal 223 . It can be understood that the power supply protection circuit may also include many other devices, which will not be described here.

The input terminal 221 of the switch module 120 is connected to the charging interface module 210, the output terminal 222 of the switch module 220 is connected to one end of the power management module 230, the control terminal 223 of the switch module 220 is connected to the other end of the power management module 230, and the control terminal of the switch module 220 223 is also connected to the battery interface module 240 , and the power management module 230 is also connected to the battery interface module 240 . It can be understood that the power protection circuit may also include many other devices, and the power management module 230 may provide power to other devices through the output power port VCC.

Wherein, the charging interface module 210 is used for inputting a power signal to the input terminal 221 of the switch module 220 . The control terminal 223 of the switch module 220 is used to control the on and off of the switch module 220 according to the power signal output by the battery interface module 240 .

The battery interface module 240 is used to connect the battery and provide trigger voltage for the power management module 230, so that the power management module 230 can provide power for components in the circuit that need power supply, so that the terminal can work normally.

When the battery interface module 240 is not connected to a battery, the input terminal 221 of the switch module 220 is disconnected from the output terminal 222 of the switch module 220 .

When the battery interface module 240 is connected to the battery, the input terminal 221 of the switch module 220 is connected to the output terminal 222 of the switch module 220 , and the charging interface module 210 is connected to the power management module 230 through the switch module 220 .

Specifically, please refer to FIG. 7, which is a circuit structure diagram of a power supply protection circuit provided by an embodiment of the present invention.

The input terminal 221 of the switch module 220 is connected to the power port VUSB of the charging interface module 210, the output terminal 222 of the switch module 220 is connected to the charging port VUSB of the power management module 230, and the control terminal 223 of the switch module 220 is connected to the trigger power port of the power management module 230 VBAT is connected to the power port VBAT of the battery interface module 240 , and the trigger power port VBAT of the power management module 230 is also connected to the power port VBAT of the battery interface module 240 . The ground port GND of the charging interface module 210 , the ground port GND of the power management module 230 and the ground port of the battery interface module 240 are respectively grounded.

Wherein, the power port VUSB of the charging interface module 210 is used to input a power signal to the input terminal 221 of the switch module 220 . The control terminal 223 of the switch module 220 detects the power signal of the power port VBAT of the battery interface module 240 to determine whether the battery interface module 240 is connected to a battery. When the battery interface module 240 is not connected to the battery, the input terminal 222 and the output terminal 223 of the switch module 220 are disconnected; when the battery interface module 240 is connected to the battery, the input terminal 222 and the output terminal 223 of the switch module 220 are connected.

The battery interface module 240 is used to connect the battery, and provides the trigger voltage for the power management module 230 through the power port VBAT and the ground port GND, so that the power management module 230 can provide power to the components that need power supply in the circuit through the output output power port VCC, to enable the terminal to work normally.

The switch module 220 detects the voltage value of the power port VBAT of the battery interface module 240 in real time, so as to determine whether the battery interface module 240 is connected to a battery. Wherein, when the switch module 220 detects that the voltage value of the power port VBAT of the battery interface module 240 is lower than the first preset threshold, it is identified that the battery interface module 240 is not connected to a battery. When the switch module 220 detects that the voltage value of the power port VBAT of the battery interface module 240 is greater than or equal to the first preset threshold, it is recognized that the battery interface module 240 is connected to a battery.

Wherein, the first preset threshold is the minimum value of the battery. Since the minimum value of the output voltage of the mobile terminal is not less than 3.2V when the battery power is insufficient and automatically shuts down, in this embodiment, the first preset threshold value is 3.2V, but it is not limited thereto, and it can also be determined according to the actual situation. In some cases, set the first preset threshold (the first preset threshold is smaller than the maximum value of the battery) to other values, which is not limited here.

When the switch module 220 detects that the battery interface module 240 is not connected to the battery, the control terminal 223 of the switch module 220 is at a low level, and the input terminal 221 of the switch module 220 is disconnected from the output terminal 222 of the switch module 220 to cut off the charging interface. The connection between the module 210 and the power management module 230, so as to prevent the external power supply from destroying the inherent power-on logic of the power management module 230 when the charging interface module 210 is connected to the power supply, and prevent the power from damaging the power management module 230 or even damage the connection with the power management module 230 other circuits. Wherein, the voltage range value of the low level is greater than zero and less than 3V, but it is not limited thereto. In other embodiments, the range value of the low level can be set according to actual conditions.

When the switch module 220 detects that the battery interface module 240 is connected to the battery, the control terminal 223 of the switch module 220 is at a high level, the input terminal 221 of the switch module 220 is connected to the output terminal 222 of the switch module 220, and the charging interface module 210 is connected to the power supply. The management module 230 establishes a connection through the switch module 220 . Wherein, the voltage range value of the high level is greater than or equal to 3V and less than or equal to 6V, but it is not limited thereto. In other embodiments, the range value of the high level can be set according to actual conditions.

When the charging interface module 210 is powered on, the power management module 230 charges the battery connected to the battery interface module 240 according to the power signal transmitted by the power port VUSB of the charging interface module 210 . When the power management module 230 detects that the voltage value of the power port VBAT of the battery interface module 240 is greater than or equal to the second preset threshold value, the power supply signal is output to the circuit connected to the power management module 230 through the output power port VCC, so that it is connected to the power supply The circuits connected to the management module 230 can work normally, so that the terminal can realize various preset functions.

Wherein, the second preset threshold is larger than the first preset threshold and smaller than the maximum voltage value allowed by the battery.

When the power management module 230 detects that the voltage value of the trigger power port VBAT is equal to the maximum voltage value allowed by the battery, it controls the battery interface module 240 to stop charging the battery. Wherein, in this embodiment, the maximum voltage value of the battery is 4.2V.

Wherein, the maximum value of the low-level voltage range value is less than the first preset threshold value, the minimum value of the high-level voltage range value is less than or equal to the first preset threshold value, and the maximum value of the low-level voltage range value is less than The minimum value of the voltage range value for high level.

The above solution, by adding a switch module between the charging interface module and the power management module, can cut off the connection between the charging interface module and the power management module when the terminal not connected to the battery is connected to the power supply through the charging interface module, thereby preventing the power supply from burning out Power management module.

Please refer to FIG. 8 . FIG. 8 is a circuit structure diagram in which the switch module in the power supply protection circuit of FIG. 6 is an N-type field effect transistor.

As shown in FIG. 8 , the switch module 220 is an N-type field effect transistor. Wherein, the N-type field effect transistor includes a gate g, a source d and a drain s, the gate g is the control terminal 223 , the source d is the input terminal 221 , and the drain s is the output terminal 222 .

The N-type field effect transistor 220 detects the voltage value of the power port VBAT of the battery interface module 240 in real time, so as to determine whether the battery interface module 240 is connected to a battery. Wherein, when the N-type field effect transistor 220 detects that the voltage value of the power port VBAT of the battery interface module 240 is lower than the first preset threshold, it is identified that the battery interface module 240 is not connected to a battery. When the N-type field effect transistor 220 detects that the power port VBAT of the battery interface module 240 is greater than or equal to the first preset threshold, it is identified that the battery interface module 240 is connected to a battery.

Wherein, the first preset threshold is the minimum value of the battery. Since the minimum value of the output voltage of the mobile terminal is not less than 3.2V when the battery power is insufficient and automatically shuts down, in this embodiment, the first preset threshold value is 3.2V, but it is not limited thereto, and it can also be determined according to the actual situation. In some cases, set the first preset threshold (the first preset threshold is smaller than the maximum value of the battery) to other values, which is not limited here.

When the N-type field effect transistor 220 detects that the battery interface module 240 is not connected to the battery, the gate 223 of the N-type field effect transistor 220 is at a low level, and the source 221 of the N-type field effect transistor 220 is connected to the N-type field effect transistor 220. The drain 222 of the battery is disconnected to cut off the connection between the charging interface module 210 and the power management module 230, thereby preventing the external power supply from destroying the inherent power-on logic of the power management module 230 and preventing the power supply from being damaged when the charging interface module 210 is connected to the power supply. The power management module 230 even damages other circuits connected to the power management module 230 . Wherein, the voltage range value of the low level is greater than zero and less than 3V, but it is not limited thereto. In other embodiments, the range value of the low level can be set according to actual conditions.

When the N-type field effect transistor 220 detects that the battery interface module 240 is connected to the battery, the grid 223 of the N-type field effect transistor 220 is at a high level, and the source 221 of the N-type field effect transistor 220 is connected to the N-type field effect transistor 220. The drain 222 is connected, and the charging interface module 210 and the power management module 230 are connected through the switch module 220 . Wherein, the voltage range value of the high level is greater than or equal to 3V and less than or equal to 6V, but it is not limited thereto. In other embodiments, the range value of the high level can be set according to actual conditions.

When the charging interface module 210 is powered on, the power management module 230 charges the battery connected to the battery interface module 240 according to the power signal transmitted by the power port VUSB of the charging interface module 210 . When the power management module 230 detects that the voltage value of the power port VBAT of the battery interface module 240 is greater than or equal to the second preset threshold, it outputs a power signal to the control module 250 through the output power port VCC, so that the power supply connected to the power management module 230 The circuit can work normally so that the terminal can realize various preset functions.

Wherein, the second preset threshold is larger than the first preset threshold and smaller than the maximum voltage value allowed by the battery.

When the power management module 230 detects that the voltage value of the trigger power port VBAT is equal to the maximum voltage value allowed by the battery, it controls the battery interface module 240 to stop charging the battery. Wherein, in this embodiment, the maximum voltage value of the battery is 4.2V.

Wherein, the maximum value of the low-level voltage range value is less than the first preset threshold value, the minimum value of the high-level voltage range value is less than or equal to the first preset threshold value, and the maximum value of the low-level voltage range value is less than The minimum value of the voltage range value for high level.

In the above solution, by adding an N-type field effect transistor between the charging interface module and the power management module, when the terminal not connected to the battery is connected to the power supply through the charging interface module, the connection between the charging interface module and the power management module can be cut off, and then Prevent the power supply from burning out the power management module.

Please refer to FIG. 9 . FIG. 9 is a circuit structure diagram in which the switch module in the power protection circuit of FIG. 6 is an electronic analog switch.

As shown in FIG. 9 , the switch module 220 is an electronic analog switch. Wherein, the electronic analog switch at least includes an input terminal 221 , an output terminal 222 and a control terminal 223 . The electronic analog switch can be a single-pole single-throw switch, a single-pole double-throw switch, or a single-pole multiple throw switch.

The electronic analog switch 220 detects the voltage value of the power port VBAT of the battery interface module 240 in real time, so as to determine whether the battery interface module 240 is connected to a battery. Wherein, when the electronic analog switch 220 detects that the voltage value of the power port VBAT of the battery interface module 240 is lower than the first preset threshold, it is identified that the battery interface module 240 is not connected to a battery. When the electronic analog switch 220 detects that the voltage value of the power port VBAT of the battery interface module 240 is greater than or equal to a first preset threshold, it is identified that the battery interface module 240 is connected to a battery.

Wherein, the first preset threshold is the minimum value of the battery. Since the minimum value of the output voltage of the mobile terminal is not less than 3.2V when the battery power is insufficient and automatically shuts down, in this embodiment, the first preset threshold value is 3.2V, but it is not limited thereto, and it can also be determined according to the actual situation. In some cases, set the first preset threshold (the first preset threshold is smaller than the maximum value of the battery) to other values, which is not limited here.

When the electronic analog switch 220 detects that the battery interface module 240 is not connected to the battery, the control terminal 223 of the electronic analog switch 220 is at a low level, and the input terminal 221 of the electronic analog switch 220 is disconnected from the output terminal 222 of the electronic analog switch 220, To cut off the connection between the charging interface module 210 and the power management module 230, so as to prevent the external power supply from destroying the inherent power-on logic of the power management module 230 when the charging interface module 210 is connected to the power supply Conditions of other circuits connected to the management module 230 . Wherein, the voltage range value of the low level is greater than zero and less than 3V, but it is not limited thereto. In other embodiments, the range value of the low level can be set according to actual conditions.

When the electronic analog switch 220 detects that the battery interface module 240 is connected to the battery, the control terminal 223 of the electronic analog switch 220 is at a high level, the input terminal 221 of the electronic analog switch 220 is connected to the output terminal 222 of the electronic analog switch 220, and the charging interface The module 210 is connected with the power management module 230 through the switch module 220 . Wherein, the voltage range value of the high level is greater than or equal to 3V and less than or equal to 6V, but it is not limited thereto. In other embodiments, the range value of the high level can be set according to actual conditions.

When the power management module 230 is powered on, the power management module 230 charges the battery connected to the battery interface module 240 according to the power signal transmitted by the power port VUSB of the charging interface module 210 . When the power management module 230 detects that the voltage value of the power port VBAT of the battery interface module 240 is greater than or equal to the second preset threshold value, the power supply signal is output to the circuit connected to the power management module 230 through the output power port VCC, so that it is connected to the power supply The circuits connected to the management module 230 can work normally, so that the terminal can realize various preset functions.

Wherein, the second preset threshold is larger than the first preset threshold and smaller than the maximum voltage value allowed by the battery.

When the power management module 230 detects that the voltage value of the trigger power port VBAT is equal to the maximum voltage value allowed by the battery, it controls the battery interface module 240 to stop charging the battery. Wherein, in this embodiment, the maximum voltage value of the battery is 4.2V.

Wherein, the maximum value of the low-level voltage range value is less than the first preset threshold value, the minimum value of the high-level voltage range value is less than or equal to the first preset threshold value, and the maximum value of the low-level voltage range value is less than The minimum value of the voltage range value for high level.

The above solution, by adding an electronic analog switch between the charging interface module and the power management module, can cut off the connection between the charging interface module and the power management module when the terminal not connected to the battery is connected to the power supply through the charging interface module, thereby preventing the power from Burn out the power management module.

Please refer to FIG. 10 . FIG. 10 is a partial structural diagram of a terminal provided by an embodiment of the present invention. The terminal in this embodiment is a terminal based on the MTK platform, but is not limited thereto, and may also be a terminal based on other platforms in other embodiments. The terminal in this embodiment includes a power protection circuit 1010 , a processor 1020 and a memory 1030 . It can be understood that the terminal may also include many other devices, which will not be described in detail here.

Wherein, the power protection circuit 1010 is the power protection circuit described in any one of the above-mentioned embodiments. The power protection circuit 1010 is respectively connected to the processor 1020 and the memory 1030 , and the processor 1020 is also connected to the memory 1030 .

The power protection circuit 1010 is used to provide power to the processor 1020 and the memory 1030 . In order to make the processor 1020 and the memory 1030 work normally. For the specific implementation manner of the power supply protection circuit 1010, please refer to the relevant description of the above-mentioned embodiments, which will not be repeated here.

The memory 1030 is used to store data.

The processor 1020 is configured to control the terminal to realize various preset functions according to the data stored in the memory 1030 .

The above-mentioned solution can prevent the inherent power-on logic of the circuit from being damaged by the power supply and prevent the terminal from being burned by the power supply when the terminal not connected to the battery is powered on.

In the above description, for the purpose of illustration rather than limitation, specific details such as specific system structures, interfaces, and technologies are presented for a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

Claims (10)

1. A power supply protection circuit, the circuit includes a charging interface module, a power management module and a battery interface module, characterized in that the circuit also includes a switch module, and the switch module at least includes a control terminal, an input terminal and an output terminal ; The input end of the switch module is connected to the charging interface module, the output end of the switch module is connected to one end of the power management module, the control end of the switch module is connected to the other end of the power management module, and the power supply The management module is also connected to the battery interface module; When the battery interface module is not connected to a battery, the input terminal of the switch module is disconnected from the output terminal of the switch module; When the battery interface module is connected to a battery, the input end of the switch module is connected to the output end of the switch module, and the charging interface module is connected to the power management module through the switch module. 2. The circuit according to claim 1, wherein the control terminal is also connected to the battery interface module. 3. The circuit according to claim 1, wherein when the power management module detects that the battery interface module is not connected to the battery, the power management module outputs a low level to the control terminal, controlling the input terminal to be disconnected from the output terminal; When the power management module detects that the battery interface module is connected to the battery, the power management module outputs a high level to the control terminal, and controls the input terminal to establish a connection with the output terminal. 4. The circuit according to claim 2, wherein when the control terminal detects that the battery interface module is not connected to the battery, the input terminal is disconnected from the output terminal; When the control terminal detects that the battery interface module is connected to the battery, the input terminal establishes a connection with the output terminal. 5. The circuit according to any one of claims 1-4, wherein the switch module is an N-type field effect transistor. 6. The circuit according to claim 5, wherein the N-type field effect transistor comprises a gate, a source and a drain, the gate is the control terminal, the source is the input terminal, The drain is the output terminal. 7. The circuit according to any one of claims 1-4, wherein the switch module is an electronic analog switch. 8. The circuit according to claim 3 or 4, wherein the voltage range value of the low level is greater than zero and less than 3V. 9. The circuit according to claim 3 or 4, wherein the voltage range value of the high level is greater than or equal to 3V and less than or equal to 6V. 10. A terminal, comprising a processor and a memory, characterized in that the terminal further comprises the power protection circuit according to any one of claims 1 to 9, the power protection circuit is respectively connected to the processor and the memory.