CN106532875B - mobile terminal - Google Patents

Abstract

An embodiment of the present invention provides a mobile terminal, including a main board, a control unit, and a voltage dividing unit. When the battery of the mobile terminal is charged, the control unit controls the voltage dividing unit to be electrically connected to the main board, so that the voltage dividing unit is electrically connected. Share part of the system voltage. In this scheme, when the battery of the mobile terminal is charged, the control unit controls the voltage dividing unit to achieve electrical connection with the main board, so as to share the voltage loaded by the system on the main board through the voltage dividing unit, so that the voltage on the main board is lower than the safe voltage that can be tolerated. , thereby preventing the main board from being burned out by high voltage, thereby improving the stability of the main board, and further improving the stability of the mobile terminal.

Description

mobile terminal

technical field

The present invention relates to the field of communication technologies, and in particular, to a mobile terminal.

Background technique

Currently, the charging function is managed by the charging management chip in the mobile terminal. When charging the mobile terminal, the charging management chip outputs two voltages. One of the voltages charges the battery in the mobile terminal, and the other voltage supplies power to the mobile terminal system. After charging is complete, the system is powered by the battery.

After the charging is completed, the battery voltage reaches the full voltage, and the battery voltage is higher at this time. When an external power source supplies power to the system through an adapter or a battery supplies power to the system, the system voltage will be higher than the battery voltage. However, some components in the mobile terminal have a relatively low withstand voltage value, such as Power Management Integrated Circuit (PMIC). The stability of the mobile terminal is low.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a mobile terminal, which can improve the stability of the mobile terminal.

An embodiment of the present invention provides a mobile terminal, including a main board, a control unit, and a voltage dividing unit. When the battery of the mobile terminal is charged, the control unit controls the voltage dividing unit to be electrically connected to the main board, so that the voltage dividing unit is electrically connected. Share part of the system voltage.

In the mobile terminal provided by the embodiment of the present invention, when the battery of the mobile terminal is fully charged, the control unit controls the voltage dividing unit to be electrically connected to the main board, so as to share the voltage loaded by the system on the main board through the voltage dividing unit, so that the voltage on the main board is low Because of the safe voltage that can be endured, the main board is prevented from being burned out by high voltage, so that the stability of the main board can be improved, and the stability of the mobile terminal can be improved.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic diagram of an application scenario of charging a mobile terminal according to an embodiment of the present invention.

FIG. 2 is a first structural schematic diagram of a mobile terminal provided by an embodiment of the present invention.

FIG. 3 is a schematic diagram of a second structure of a mobile terminal provided by an embodiment of the present invention.

FIG. 4 is a schematic diagram of a third structure of a mobile terminal provided by an embodiment of the present invention.

FIG. 5 is a schematic diagram of a fourth structure of a mobile terminal provided by an embodiment of the present invention.

FIG. 6 is a schematic diagram of a fifth structure of a mobile terminal provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., or The positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction of two elements relation. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present disclosure may repeat reference numerals and/or reference letters in different instances for the purpose of simplicity and clarity and not in itself indicative of a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to FIG. 1 , when the mobile terminal 100 is being charged, the mobile terminal 100 and the adapter 200 are connected through a data cable. The adapter 200 can be connected to an external power source. At this time, the charging chip in the mobile terminal 100 is responsible for managing the charging process. The charging chip receives the voltage signal input by the adapter and outputs two voltage signals. There are two voltage signals output by the charging chip, one of which is input to the battery to charge the battery; the other is input to the motherboard to supply power to the mobile terminal system. Referring to FIG. 2 , the mobile terminal 100 includes a charging chip 10 , a main board 20 , a control unit 30 , a voltage dividing unit 40 and a battery 50 .

The charging chip 10 , the main board 20 , the control unit 30 and the voltage dividing unit 40 are connected in sequence, and the charging chip 10 is connected with the battery 50 at the same time.

During the charging process of the mobile terminal 100, the charging chip 10 receives the voltage signal input by the external adapter, and outputs two voltage signals. One of the voltage signals is input to the motherboard 20 , and the other voltage signal is input to the battery 50 . The voltage magnitudes of the two voltage signals output by the charging chip 10 are the same.

The charging chip 10 can detect the charging state of the mobile terminal 100 in real time. The charging state includes charging in progress and charging completed.

Many components can be integrated on the main board 20 . For example, a processor (CPU, Central Processing Unit), a power management chip (PMIC, Power Management Integrated Circuit), an input and output interface, etc. in the mobile terminal 100 can all be integrated into the mainboard 20 . After receiving the voltage signal output by the charging chip 10, the main board 20 supplies power to each component of the mobile terminal 100 through the PMIC.

The control unit 30 is used to control the main board 20 to achieve electrical connection or disconnection with the voltage dividing unit 40 .

During the charging process of the mobile terminal 100 , the voltage output by the charging chip 10 increases as the voltage of the battery 50 increases.

When the charging chip 10 detects that the mobile terminal 100 is in a charging state, the voltage output by the charging chip 10 to the battery 50 has not yet reached the full voltage of the battery 50, and the voltage output by the charging chip 10 is relatively low.

Since the two voltages output by the charging chip 10 are the same, the voltage output to the main board 20 is also lower at this time. There is no risk of the main board 20 being burnt out, so the voltage dividing unit 40 does not need to share the voltage. At this time, the control unit 30 controls the main board 20 to disconnect the electrical connection from the voltage dividing unit 40 .

When the charging chip 10 detects that the charging of the mobile terminal 100 is completed, it means that the voltage of the battery 50 reaches the full voltage. The voltage output by the charging chip 10 is equal to the battery voltage. For example, the voltage of the battery 50 reaches 4.35V. At this time, the voltage output by the charging chip is also 4.35V.

At present, during the charging process of the mobile terminal, the adapter supplies power to the system and charges the battery through the charging chip. During charging, the system supply voltage Vsys is equal to the battery voltage Vbat, that is, Vsys=Vbat. When the battery is fully charged, the adapter continues to power the system through the charging chip. In order to prevent the battery from discharging and thus prevent the battery from supplying power to the system, the adapter will disconnect the charging path for charging the battery, and apply a voltage of about 150mv to the system through the adapter power supply path to prevent the battery from supplying power to the system. At this time, Vsys=Vbat+150mv, and Vsys is higher than the battery voltage Vbat. At this time, since the battery voltage Vbat is lower than the system voltage Vsys, the battery will not supply power to the system. However, if the system voltage Vsys is relatively high, components such as PMICs and motherboards with low withstand voltage may be burned out.

Since the voltage loaded by the system onto the motherboard 20 is slightly higher than the voltage output by the charging chip 10 , the voltage loaded by the system onto the motherboard 20 is likely to exceed the safe voltage of the motherboard 20 at this time.

For example, when the system voltage is 150mv higher than the voltage output by the charging chip 10, the voltage on the motherboard reaches 4.5V. The safety voltage of the main board 20 is also 4.5V, for example, at this time, the main board 20 faces the risk of being burned out.

At this time, the control unit 30 controls the main board 20 to be electrically connected to the voltage dividing unit 40, and the voltage dividing unit 40 can share part of the system voltage, so that the voltage on the main board 20 is lower than the safe voltage to prevent the main board 20 from being burned out.

After the voltage dividing unit 40 is electrically connected to the main board 20 , it can share the voltage loaded on the main board 20 by the mobile terminal system.

The battery 50 may also be connected to the main board 20 . When the mobile terminal 100 is disconnected from the external adapter, the battery 50 can supply power to the mobile terminal system through the mainboard 20 .

In some embodiments, as shown in FIG. 3 , the control unit 30 may be a switch to control the connection or disconnection between the main board 20 and the voltage dividing unit 40 .

Switch 30 may be of various types. For example, the switch 30 may be a transistor. When the transistor is turned on, the main board 20 is electrically connected to the voltage dividing unit 40 ; when the transistor is turned off, the main board 20 is electrically disconnected from the voltage dividing unit 40 . In some embodiments, switch 30 may also be a micro-mechanical switch.

In some embodiments, the voltage dividing unit 40 is a resistor. When the switch 30 is turned on, the resistor 40 is connected in series with the main board 20 . At this time, the resistor 40 can share the voltage loaded on the motherboard 20 by the system. In some embodiments, the resistance value of resistor 40 may be 1000 ohms.

In some embodiments, as shown in FIG. 4 , the voltage dividing unit 40 may include a resistor 41 and a resistor 42 . Resistor 41 and resistor 42 are connected in series. The resistance values of the resistors 41 and 42 may be the same or different. For example, the resistance values of the resistors 41 and 42 are both 500 ohms.

Here, it is only taken as an example that the voltage dividing unit 40 includes two resistors. It can be understood that the number of resistors included in the voltage dividing unit 40 may also be greater than two. For example, the voltage dividing unit 40 includes three resistors connected in series with each other, four resistors connected in series with each other, and the like.

Referring to FIG. 5 , FIG. 5 is a schematic structural diagram of another mobile terminal according to an embodiment of the present invention.

As shown in FIG. 5 , the mobile terminal 100 includes a charging chip 10 , a main board 20 , a control unit 30 , a voltage dividing unit 40 , a battery 50 and a resistance unit 60 .

The charging chip 10 , the control unit 30 , the main board 20 and the resistance unit 60 are connected in sequence to form a first circuit. The charging chip 10 , the control unit 30 , the voltage dividing unit 40 and the main board 20 are connected in sequence to form a second circuit. Meanwhile, the voltage dividing unit 40 is connected with the resistance unit 60 . Meanwhile, the charging chip 10 is connected to the battery 50 .

During the charging process of the mobile terminal 100, the charging chip 10 receives the voltage signal input by the external adapter, and outputs two voltage signals. One of the voltage signals is input to the motherboard 20 , and the other voltage signal is input to the battery 50 . The voltage magnitudes of the two voltage signals output by the charging chip 10 are the same.

The charging chip 10 can detect the charging state of the mobile terminal 100 in real time. The charging state includes charging in progress and charging completed.

Many components can be integrated on the main board 20 . For example, a processor (CPU, Central Processing Unit), a power management chip (PMIC, Power Management Integrated Circuit), an input and output interface, etc. in the mobile terminal 100 can all be integrated into the mainboard 20 . After receiving the voltage signal output by the charging chip 10, the main board 20 supplies power to each component of the mobile terminal 100 through the PMIC.

The control unit 30 is used to control the above-mentioned first line to be connected or the second line to be connected. In some embodiments, the control unit 30 includes a switch 31 and a switch 32 . The switch 32 is connected to the charging chip 10 and the main board 20 , and the switch 31 is connected to the charging chip 10 and the voltage dividing unit 40 .

During the charging process of the mobile terminal 100 , the voltage output by the charging chip 10 increases as the voltage of the battery 50 increases.

When the charging chip 10 detects that the mobile terminal 100 is in a charging state, the voltage output by the charging chip 10 to the battery 50 has not yet reached the full voltage of the battery 50, and the voltage output by the charging chip 10 is relatively low.

Since the two voltages output by the charging chip 10 are the same, the voltage output to the main board 20 is also lower at this time. There is no risk of the main board 20 being burned out, so the voltage dividing unit 40 is not required to share the voltage. At this time, the switch 32 is turned on to connect the first line; the switch 31 is turned off to disconnect the second line.

When the charging chip 10 detects that the charging of the mobile terminal 100 is completed, it means that the voltage of the battery 50 reaches the full voltage. The voltage output by the charging chip 10 is equal to the battery voltage. For example, the voltage of the battery 50 reaches 4.35V. At this time, the voltage output by the charging chip is also 4.35V.

Since the voltage loaded by the system onto the motherboard 20 is slightly higher than the voltage output by the charging chip 10 , the voltage loaded by the system onto the motherboard 20 is likely to reach the safe voltage of the motherboard 20 at this time.

For example, when the system voltage is 150mv higher than the voltage output by the charging chip 10, the voltage on the motherboard reaches 4.5V. The safety voltage of the main board 20 is also 4.5V, for example, at this time, the main board 20 faces the risk of being burned out.

At this time, the switch 31 is turned on to connect the second line; the switch 32 is turned off to disconnect the first line. Therefore, the voltage dividing unit 40 can share part of the system voltage, so that the voltage on the main board 20 is lower than the safe voltage, so as to prevent the main board 20 from being burned out.

After the switch 31 is turned on, the voltage dividing unit 40 is electrically connected to the main board 20 . At this time, the voltage dividing unit 40 can share the voltage loaded on the main board 20 by the mobile terminal system. The voltage dividing unit 40 may be a resistor.

The battery 50 may also be connected to the main board 20 . When the mobile terminal 100 is disconnected from the external adapter, the battery 50 can supply power to the mobile terminal system through the mainboard 20 .

When the above-mentioned first line is turned on, the resistance unit 60 is connected in series with the main board 20 . When the above-mentioned second line is connected, the resistance unit 60 is connected in parallel with the main board 20 . The resistance value of the resistance unit 60 is smaller than the resistance value of the resistance unit 40 . For example, the resistance value of the resistance unit 60 may be 23 ohms. The resistor unit 60 cooperates with the resistor 40 so that the voltage on the main board 20 is lower than the safe voltage which can be endured.

For example, when the charging of the mobile terminal 100 is completed, the voltage of the battery 50 is 4.35V. At this time, the two voltages output by the charging chip 10 are both 4.35V. The system voltage loaded on the mainboard 20 is 150mv higher than the voltage output by the charging chip 10 , that is, the voltage on the mainboard 20 is 4.5V. If the safe voltage that the main board 20 can withstand is 4.4V, the voltage dividing unit 40 needs to share part of the voltage on the main board 20 at this time. When the value of the resistance 40 is 1000 ohms and the value of the resistance unit 60 is 23 ohms, the actual voltage on the main board 20 can be made lower than the safe voltage of 4.4V.

Switch 31 and switch 32 may be various types of switches. In some embodiments, the switch 31 and the switch 32 may be transistors. In some embodiments, the switch 31 and the switch 32 can also be micro-mechanical switches.

In some embodiments, the voltage dividing unit 40 is a resistor. When the switch 31 is turned on, the above-mentioned second circuit is turned on, and the resistor 40 is connected in series with the main board 20 . At this time, the resistor 40 can share the voltage loaded on the motherboard 20 by the system. In some embodiments, the resistance value of resistor 40 may be 1000 ohms.

In some embodiments, as shown in FIG. 6 , the voltage dividing unit 40 may include a plurality of first resistors. For example, the voltage dividing unit 40 includes a first resistor 41 and a first resistor 42 . The first resistor 41 and the first resistor 42 are connected in series. The resistance values of the first resistor 41 and the first resistor 42 may be the same or different. For example, the resistance values of the first resistor 41 and the first resistor 42 are both 500 ohms.

Here, it is only taken as an example that the voltage dividing unit 40 includes two first resistors. It can be understood that, the number of first resistors included in the voltage dividing unit 40 may also be greater than two.

In some embodiments, as shown in FIG. 6 , the resistance unit 60 may include a plurality of second resistances. For example, the resistance unit 60 includes a second resistance 61 and a second resistance 62 . The second resistor 61 and the second resistor 62 are connected in series. The resistance values of the second resistor 61 and the second resistor 62 may be the same or different. For example, the resistance values of the second resistor 61 and the second resistor 62 are both 11.5 ohms.

Here, it is only exemplified that the resistor unit 60 includes two second resistors. It can be understood that, the number of second resistors included in the resistor unit 60 may also be one or more than two.

It can be seen from the above that the mobile terminal provided by the embodiment of the present invention includes a main board, a control unit and a voltage dividing unit. When the battery of the mobile terminal is charged, the control unit controls the voltage dividing unit to be electrically connected to the main board, so that the voltage dividing unit is electrically connected to the main board. The voltage dividing unit shares part of the system voltage. In this scheme, when the battery of the mobile terminal is charged, the control unit controls the voltage dividing unit to achieve electrical connection with the main board, so as to share the voltage loaded by the system on the main board through the voltage dividing unit, so that the voltage on the main board is lower than the safe voltage that can be tolerated. , thereby preventing the main board from being burned out by high voltage, thereby improving the stability of the main board, thereby improving the stability of the mobile terminal.

The mobile terminals provided by the embodiments of the present invention are described above in detail, and specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scope. To sum up, the content of this specification should not be construed as a limitation of the present invention.

Claims (10)

1. a mobile terminal, comprising a mainboard, a control unit, a voltage dividing unit and a charging chip, when the battery of the mobile terminal is charged, the control unit controls the voltage dividing unit to be electrically connected to the mainboard, so that The voltage dividing unit shares part of the system voltage; The charging chip outputs two voltage signals, one of the voltage signals is sent to the battery, the other is to the main board, and the voltages of the two voltage signals are the same. 2 . The mobile terminal according to claim 1 , wherein the control unit comprises a first switch, and the first switch is turned on when the battery of the mobile terminal is fully charged. 3 . 3 . The mobile terminal according to claim 2 , wherein the charging chip, the first switch, the voltage dividing unit and the main board are connected in sequence, and the control unit further comprises a second switch, the second switch It is respectively connected with the charging chip and the main board, and when the battery of the mobile terminal is fully charged, the second switch is turned off. 4. The mobile terminal according to any one of claims 1 to 3, wherein the voltage dividing unit comprises a first resistor. 5 . The mobile terminal according to claim 4 , wherein the number of the first resistors is greater than one, and a plurality of the first resistors are connected in sequence. 6 . 6 . The mobile terminal according to claim 5 , wherein the resistance values of the plurality of first resistors are the same. 7 . 7. The mobile terminal according to claim 2 or 3, wherein the first switch is a transistor. 8 . The mobile terminal according to claim 3 , further comprising a resistance unit, and the resistance unit is respectively connected to the main board and the voltage dividing unit. 9 . 9 . The mobile terminal according to claim 8 , wherein the resistance value of the resistance unit is smaller than the resistance value of the voltage dividing unit. 10 . 10 . The mobile terminal according to claim 8 , wherein the resistance unit comprises a plurality of second resistances, and the plurality of second resistances are connected in sequence. 11 .