CN220553833U

CN220553833U - Battery buckling protection circuit and electronic equipment

Info

Publication number: CN220553833U
Application number: CN202322019462.5U
Authority: CN
Inventors: 董鹏
Original assignee: Xian Wingtech Information Technology Co Ltd
Current assignee: Xian Wingtech Information Technology Co Ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2024-03-01
Anticipated expiration: 2033-07-28

Abstract

The utility model provides a battery buckling protection circuit and electronic equipment, and relates to the technical field of electronics. The circuit comprises a switch module and a pull-down resistor, wherein a first connecting end of the switch module is electrically connected with a main board power interface, a second connecting end of the switch module is electrically connected with a main board signal interface, a third connecting end of the switch module is electrically connected with a connector signal interface, and a fourth connecting end of the switch module is grounded through the pull-down resistor. The main board power interface is electrified after the electronic equipment is started, and under the condition that the main board power interface is not electrified, the second connecting end is conducted with the fourth connecting end, and the fourth connecting end is grounded through the pull-down resistor, so that the main board can realize battery in-place detection through the main board signal interface, and the equipment starting cannot be influenced; the second connecting end and the third connecting end are conducted under the condition that the power supply interface of the main board is electrified, so that the situation that the main board signal interface is electrified after the power supply of the equipment system is electrified, and the main board IC is invalid in the process of buckling a battery is avoided.

Description

Battery buckling protection circuit and electronic equipment

Technical Field

The utility model relates to the technical field of electronics, in particular to a battery buckling protection circuit and electronic equipment.

Background

With the popularization of electronic devices such as mobile phones and tablet computers, batteries are increasingly used in the electronic devices. In electronic devices, a battery connector is generally used to connect a battery and a main board, and therefore, in the development and production stages, there are various cases where the battery is fastened. In the process of fastening the battery, if the interface pitch of the battery is designed to be too small or other defects, there may be a case that the power interface of the battery is fastened to the signal interface of the battery connector. Generally, the voltage withstand value of the signal interface is relatively low, and the signal interface at the main board side may be invalid due to the misplaced battery buckling, the askew battery buckling, the improper buckling and the like, and the signal interface is generally an MOS tube designed in the main board IC (Integrated Circuit ), so that the problem of burnout failure of the main board IC easily occurs in the process of buckling the battery because the situation of reverse power supply exists when the body diode of the MOS tube is conducted.

In the prior art, a resistor is generally connected in series to a signal interface of a battery connector on a motherboard to absorb a part of voltage/current, so as to prevent instant voltage/current overshoot. However, the main board generally realizes battery temperature or battery in-place detection by detecting the resistance value of the resistor connected with the signal interface, and if the resistor is connected in series with the signal interface, the obtained resistance value is larger, so that the detection result is inaccurate.

Disclosure of Invention

The utility model aims to provide a battery buckling protection circuit and electronic equipment, which can effectively avoid the condition that a main board IC fails in the process of buckling a battery.

The utility model provides a technical scheme that:

in a first aspect, the utility model provides a battery buckling protection circuit, which comprises a switch module and a pull-down resistor, wherein a first connecting end of the switch module is electrically connected with a main board power interface, a second connecting end of the switch module is electrically connected with a main board signal interface, a third connecting end of the switch module is electrically connected with a connector signal interface, and a fourth connecting end of the switch module is grounded through the pull-down resistor; the connector signal interface is a signal interface of a battery connector arranged on the main board;

the second connecting end and the third connecting end of the switch module are disconnected under the condition that the main board power interface is not electrified, and are conducted under the condition that the main board power interface is electrified; the second connecting end and the fourth connecting end of the switch module are conducted under the condition that the main board power interface is not electrified, and are disconnected under the condition that the main board power interface is electrified, so that the main board can perform battery in-place detection; and the main board power interface is electrified after the electronic equipment of the main board is started.

In an alternative embodiment, the switch module includes a first switch tube and a second switch tube, where a control pin of the first switch tube and a control pin of the second switch tube are electrically connected and then electrically connected to the main board power interface, a first pin of the first switch tube and a first pin of the second switch tube are electrically connected and then electrically connected to the main board signal interface, a second pin of the first switch tube is electrically connected to the connector signal interface, and a second pin of the second switch tube is grounded through the pull-down resistor;

the first switching tube is disconnected under the condition that the main board power interface is not electrified, and is connected under the condition that the main board power interface is electrified; the second switching tube is conducted under the condition that the main board power interface is not electrified, and is disconnected under the condition that the main board power interface is electrified.

In an alternative embodiment, the control pin of the first switching tube and the control pin of the second switching tube are electrically connected and then serve as a first connection end of the switching module; the first pin of the first switching tube is electrically connected with the first pin of the second switching tube and then used as a second connecting end of the switching module; the second pin of the first switching tube is used as a third connecting end of the switching module; and the second pin of the second switching tube is used as a fourth connecting end of the switching module.

In an alternative embodiment, the first switching tube is an N-channel field effect tube, a gate of the N-channel field effect tube is a control pin of the first switching tube, a drain of the N-channel field effect tube is a first pin of the first switching tube, and a source of the N-channel field effect tube is a second pin of the first switching tube.

In an alternative embodiment, the second switching tube is a P-channel field effect tube, a gate of the P-channel field effect tube is a control pin of the second switching tube, a source of the P-channel field effect tube is a first pin of the second switching tube, and a drain of the P-channel field effect tube is a second pin of the second switching tube.

In an alternative embodiment, the first switching tube and the second switching tube are integrated on one chip.

In an alternative embodiment, the resistance value of the pull-down resistor is equal to the resistance value of the resistor connected to the battery identification interface of the battery connector.

In a second aspect, the present utility model provides an electronic device, including a motherboard, a battery connector, and a battery buckling protection circuit according to any one of the foregoing embodiments, where the motherboard is connected to a battery through the battery connector, and the battery buckling protection circuit is disposed on the motherboard.

In an alternative embodiment, the motherboard is configured to detect whether the battery is in place according to a voltage value of the motherboard signal interface when the motherboard power interface is not powered on.

In an alternative embodiment, the battery connector includes a male socket and a female socket, the male socket and the female socket are detachably connected, one of the male socket and the female socket is disposed on the battery, and the other is disposed on the main board.

The battery buckling protection circuit and the electronic equipment provided by the utility model have the beneficial effects that: the battery buckling protection circuit comprises a switch module and a pull-down resistor, wherein a first connecting end of the switch module is electrically connected with a main board power interface, a second connecting end of the switch module is electrically connected with a main board signal interface, a third connecting end of the switch module is electrically connected with a connector signal interface, and a fourth connecting end of the switch module is grounded through the pull-down resistor; the connector signal interface is a signal interface of a battery connector arranged on the main board; the second connecting end and the third connecting end of the switch module are disconnected under the condition that the power interface of the main board is not electrified, and are conducted under the condition that the power interface of the main board is electrified; the second connecting end and the fourth connecting end of the switch module are conducted under the condition that the power interface of the main board is not electrified, and are disconnected under the condition that the power interface of the main board is electrified, so that the main board can conduct battery in-place detection. In the scene of buckling the battery, after the battery is installed on the electronic equipment, a system power supply is electrified, but a main board power supply interface is electrified after the electronic equipment on which the main board is positioned is started, under the condition that the main board power supply interface is not electrified, the second connecting end and the fourth connecting end of the switch module are conducted, and the fourth connecting end is grounded through a pull-down resistor, so that the main board can realize the battery on-site detection through the main board signal interface without influencing the starting of the equipment; the second connecting end and the third connecting end of the switch module are conducted under the condition that the power supply interface of the main board is electrified, so that the power supply of the equipment system is electrified, and the condition that the main board IC fails in the process of buckling the battery is avoided. In addition, the utility model does not need to connect a resistor in series on the signal interface of the battery connector, so that the temperature of the battery and the in-situ detection of the battery are not affected.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a power-on timing chart of a primary battery fastening process in the prior art;

FIG. 2 is a waveform diagram of a prior art circuit board IC failure caused by a primary battery snap-down process;

fig. 3 is a block diagram of a battery buckling protection circuit according to an embodiment of the present utility model;

fig. 4 is another block diagram of a battery buckling protection circuit according to an embodiment of the present utility model;

fig. 5 is a schematic circuit connection diagram of a battery buckling protection circuit according to an embodiment of the present utility model;

fig. 6 is a power-on timing chart of the battery buckling protection circuit provided in the embodiment in the process of buckling the battery once.

Icon: 100-a battery buckling protection circuit; 110-a switch module; 120-pull-down resistor; a1-a first connection terminal; a2-a second connection terminal; a3-a third connection terminal; a4-a fourth connection terminal; b1-a main board power interface; b2-motherboard signal interface; a C1-connector signal interface; 111-a first switching tube; 112-second switching tube.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the inventive product is used, or those conventionally understood by those skilled in the art, merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the development and production stages of electronic devices, there are various cases of fastening batteries. In the process of fastening the battery, if the interface pitch of the battery is designed to be too small or other defects, there may be a case that the power interface of the battery is fastened to the signal interface of the battery connector. Generally, the voltage withstand value of the signal interface is relatively low, and the signal interface at the main board side is possibly invalid due to the malposition of battery buckling, the askew battery buckling, the improper buckling and the like, and the signal interface is generally an MOS (metal oxide semiconductor) tube designed in the main board IC, so that the situation of reverse power supply filling possibly exists when a body diode of the MOS tube is conducted, and the main board IC is easy to lose efficacy in the battery buckling process.

Referring to fig. 1 and 2, fig. 1 is a power-on timing chart during a battery fastening process in the prior art, and fig. 2 is a waveform chart of a motherboard IC failure caused during a battery fastening process in the prior art. As shown in fig. 1, it is assumed that Thermal represents a battery temperature detection signal, VBAT represents a battery voltage, VPH represents a device system power supply, an abscissa of a waveform chart is a time axis, and an ordinate is a voltage value, when a snap-in dislocation occurs in a process of snapping the battery, thermal is powered on first, voltage rises, VBAT is not powered on, and voltage is reversely poured from Thermal to VPH, resulting in failure of a motherboard IC. As shown in fig. 2, assuming VBUS represents the voltage on the charger line, the solid line box represents the voltage rise of VBAT and VPH after the battery is normally buckled, i.e., when buckling dislocation does not occur, the voltage rise of VBAT and VPH is approximately one order of magnitude; the broken line box indicates that the battery is buckled again after the battery is taken down to generate buckling dislocation, and the voltage lifting of the VPH is only about half of that of the normal condition, which indicates that Thermal reverse filling occurs and that the mainboard IC fails.

In the prior art, aiming at the problem that the main board IC is easy to fail in the process of buckling the battery, a resistor is generally connected in series with a signal interface of a battery connector on the main board to absorb a part of voltage/current, so that instant voltage/current overshoot is prevented. However, the main board generally realizes battery temperature or battery in-place detection by detecting the resistance value of the resistor connected with the signal interface, and if the resistor is connected in series with the signal interface, the obtained resistance value is larger, so that the detection result is inaccurate.

Based on this, the present utility model provides a battery buckling protection circuit 100 and an electronic device, which can adjust the power-on time sequence of a signal interface in the process of buckling a battery, and is used for protecting a motherboard IC and preventing the motherboard IC from being burned out due to reverse voltage and current.

Referring to fig. 3, the present embodiment provides a battery buckling protection circuit 100, and the battery buckling protection circuit 100 can be applied to electronic devices such as a mobile phone, a tablet computer, a personal digital assistant (personal digital assistant, PDA), a mobile internet device (Mobile Internet Device, MID), and the like. The battery buckling protection circuit 100 comprises a switch module 110 and a pull-down resistor 120, wherein a first connection end A1 of the switch module 110 is electrically connected with a main board power interface B1, a second connection end A2 of the switch module 110 is electrically connected with a main board signal interface B2, a third connection end A3 of the switch module 110 is electrically connected with a connector signal interface C1, and a fourth connection end A4 of the switch module 110 is grounded through the pull-down resistor 120; the connector signal interface C1 is a signal interface of a battery connector disposed on the motherboard.

The second connection end A2 and the third connection end A3 of the switch module 110 are disconnected when the main board power interface B1 is not powered on, and are connected when the main board power interface B1 is powered on; the second connection end A2 and the fourth connection end A4 of the switch module 110 are turned on when the main board power interface B1 is not powered on, and are turned off when the main board power interface B1 is powered on, so that the main board performs battery on-site detection; the main board power interface B1 is powered on after the electronic equipment where the main board is located is started.

In this embodiment, the main board power interface B1 is a power supply on the main board, such as a 1.8V power supply (VIO 18), and the power supply can be normally powered up after the device power-on key (power key) is pressed, so that the main board power interface B1 is powered up after the electronic device where the main board is located is powered on.

In practical application, the common interfaces on the battery connector mainly include VBAT, GND, BAT _thermal, bat_id, etc., and in this case, the connector signal interface C1 in this embodiment may be bat_thermal, bat_id, etc., where the bat_id may be used to implement detection of battery in place and battery capacity; BAT_thermal can be used to achieve detection of battery temperature; wherein, BAT_thermal or BAT_ID generally obtains a battery temperature value or a resistance value in an ADC (Analog to Digital Converter, analog-to-digital conversion) mode. In the case that the electricity meter is disposed on the battery protection board, the battery connector may include an interface such as VBAT, GND, SDA, SCL, in which case, the electric quantity information is obtained through IIC (Inter-Integrated Circuit, integrated circuit bus), and the connector signal interface C1 in this embodiment may be an SDA interface or an SCL interface. It can be understood that there may be a plurality of connector signal interfaces C1 on the battery connector, and each connector signal interface C1 may be correspondingly provided with a battery buckling protection circuit 100 connected with the motherboard power interface B1 and the motherboard signal interface B2 on the motherboard, so as to realize protection of the motherboard IC during the battery buckling process.

It should be noted that, in the case that the battery connector adopts the design of the male and female sockets, one of the male socket and the female socket is disposed on the motherboard, and the other is disposed on the battery, in this case, if the female socket is disposed on the motherboard, the connector signal interface C1 is a signal interface on the female socket; if the main board is provided with the male base, the connector signal interface C1 is a signal interface on the male base.

In this embodiment, since the main board power interface is powered on after the electronic device where the main board is located is powered on, the main board power interface is not powered on in the process of fastening the battery, and the second connection end A2 and the third connection end A3 of the switch module 110 are disconnected under the condition that the main board power interface B1 is not powered on, the connector signal interface C1 of the battery connector is not communicated with the main board signal interface B2 of the main board, so that the main board IC is not burned out in the process of fastening the battery. Since the second connection terminal A2 and the third connection terminal A3 of the switch module 110 are disconnected when the motherboard power interface B1 is not powered, the motherboard cannot realize the battery in-place detection through the signal interface (such as bat_id) on the battery connector when the motherboard power interface B1 is not powered. Based on this, in this embodiment, the second connection end A2 and the fourth connection end A4 of the switch module 110 are set to be turned on under the condition that the motherboard power interface B1 is not powered on, and the fourth connection end A4 is grounded through the pull-down resistor 120, so that the motherboard can realize battery in-place detection through the voltage value of the motherboard signal interface B2, and the startup of the device is not affected.

When the equipment start key is pressed, the main board power supply interface B1 on the main board is electrified, and at the moment, the second connecting end A2 and the third connecting end A3 of the switch module 110 are communicated, so that the main board signal interface B2 is communicated with the connector signal interface C1, the equipment system power supply is electrified before the main board signal interface B2, and the equipment system power supply is electrified first, so that the withstand voltage value on the main board signal interface B2 is increased, even if the situation of battery buckling dislocation occurs, the main board signal interface B2 is not invalid, and the situation that the main board IC is invalid due to the reverse filling phenomenon is not caused.

In the battery buckling protection circuit provided by the utility model, in the scene of buckling the battery, after the electronic equipment is provided with the battery, the system power supply is electrified, but the main board power supply interface is electrified after the electronic equipment with the main board is started, under the condition that the main board power supply interface is not electrified, the second connecting end and the fourth connecting end of the switch module are conducted, and the fourth connecting end is grounded through the pull-down resistor, so that the main board can realize the battery in-place detection through the main board signal interface without influencing the equipment starting; the second connecting end and the third connecting end of the switch module are conducted under the condition that the power supply interface of the main board is electrified, so that the power supply of the equipment system is electrified, and the condition that the main board IC fails in the process of buckling the battery is avoided. In addition, the utility model does not need to connect a resistor in series on the signal interface of the battery connector, so that the temperature of the battery and the in-situ detection of the battery are not affected.

In one embodiment, the pull-down resistor 120 has a resistance equal to the resistance of the resistor connected to the battery identification interface of the battery connector.

That is, in order to realize the battery in-place detection when the main board power supply interface B1 is not powered on, the resistance value of the pull-down resistor 120 is required to be set equal to the resistance value of the resistor connected to the battery identification interface (bat_id) of the battery connector, and this is equivalent to the resistor connected to the battery identification interface being simulated by the pull-down resistor 120, so as to realize the battery in-place detection. It will be appreciated that the battery identification interface is one of the connector signal interfaces C1 on the battery connector.

In an embodiment, referring to fig. 4, the switch module 110 includes a first switch tube 111 and a second switch tube 112, the control pin of the first switch tube 111 and the control pin of the second switch tube 112 are electrically connected to the motherboard power interface B1, the first pin of the first switch tube 111 and the first pin of the second switch tube 112 are electrically connected to the motherboard signal interface B2, the second pin of the first switch tube 111 is electrically connected to the connector signal interface C1, and the second pin of the second switch tube 112 is grounded through a pull-down resistor 120.

The first switching tube 111 is turned off when the main board power interface B1 is not powered on, and turned on when the main board power interface B1 is powered on; the second switching tube 112 is turned on when the main board power supply interface B1 is not powered on, and turned off when the main board power supply interface B1 is powered on.

The control pin of the first switch tube 111 and the control pin of the second switch tube 112 are electrically connected and then serve as a first connection end A1 of the switch module 110; the first pin of the first switch tube 111 and the first pin of the second switch tube 112 are electrically connected and then serve as a second connection end A2 of the switch module 110; the second pin of the first switch tube 111 serves as a third connection end A3 of the switch module 110; the second pin of the second switching tube 112 serves as the fourth connection terminal A4 of the switching module 110.

That is, when the motherboard power interface B1 is not powered on, the first switch tube 111 is turned off, the second switch tube 112 is turned on, at this time, the motherboard signal interface B2 is not connected to the connector signal interface C1, the motherboard signal interface B2 is connected to the second pin of the second switch tube 112, and the voltage value obtained by the motherboard through the motherboard signal interface B2 can obtain the resistance value of the pull-down resistor 120, so as to determine whether the battery is in place. After the main board power supply interface B1 is powered on, the first switch tube 111 can be turned on, the second switch tube 112 is turned off, at this time, the main board signal interface B2 is communicated with the connector signal interface C1, and the main board signal interface B2 is powered on after the power supply of the equipment system is powered on.

In one embodiment, referring to fig. 5, the first switch tube 111 may be an N-channel field effect tube, a gate of the N-channel field effect tube is a control pin of the first switch tube 111, a drain of the N-channel field effect tube is a first pin of the first switch tube 111, and a source of the N-channel field effect tube is a second pin of the first switch tube 111. The second switch tube 112 may be a P-channel field effect tube, the gate of the P-channel field effect tube is a control pin of the second switch tube 112, the source of the P-channel field effect tube is a first pin of the second switch tube 112, and the drain of the P-channel field effect tube is a second pin of the second switch tube 112.

In one embodiment, the first switching tube 111 and the second switching tube 112 may be integrated on one chip. That is, the switch module 110 may be a chip.

Referring to fig. 6, a power-on timing chart of the battery fastening protection circuit 100 according to the present embodiment in a process of fastening a battery is shown. As shown in fig. 6, thermal represents a signal (such as a battery temperature detection signal, a battery in-place detection signal, etc.) on the main board signal interface B2, VPH represents a device system power supply, L21 represents a signal of the main board power interface B1, and PWRK represents a power-on signal. When the battery is installed, VPH and PWRK will have power (jump from low level to high level), the connector signal interface C1 of the battery connector is not connected to the main board signal interface B2 of the main board, and since the device is not started, there is no pulse signal on Thermal, L21 is still low level. When a start key is pressed, the PWRK jumps from a high level to a low level, and the corresponding moment is the start moment; about 110ms after the start key is pressed, the L21 jumps, which indicates that the main board power interface B1 is electrified, at this time, the connector signal interface C1 of the battery connector is communicated with the main board signal interface B2 of the main board, and a pulse signal (a dotted arrow mark) starts to appear on the Thermal. Therefore, the power-on time sequence of each signal after the battery is mounted is optimized, the Thermal is ensured to be powered on after VPH, battery temperature information and the like are obtained after a power-on key is pressed, and normal power-on is not affected; the problem that the mainboard IC is easy to burn out in the process of buckling the battery is solved, the whole circuit can be effectively protected, and the condition that the mainboard IC is burned out by reverse voltage and current can not occur.

The embodiment also provides an electronic device, which includes a main board, a battery connector and the battery buckling protection circuit 100, wherein the main board is connected with a battery through the battery connector, and the battery buckling protection circuit 100 is arranged on the main board.

The electronic device may be a mobile phone, a tablet computer, a personal digital assistant, a mobile internet device, etc., which is not limited in this embodiment.

In one embodiment, the motherboard is configured to detect whether the battery is in place according to the voltage value of the motherboard signal interface B2 when the motherboard power interface B1 is not powered on.

In one embodiment, the battery connector may include a male socket and a female socket, one of which is disposed on the battery and the other of which is disposed on the motherboard, the male socket and the female socket being detachably connected.

It will be appreciated that the battery connector may include two parts, namely, a male socket and a female socket, one part is disposed on the battery and the other part is disposed on the motherboard, so the connector signal interface C1 mentioned in the battery snap protection circuit 100 in the foregoing embodiment may be understood as a signal interface on the part of the battery connector disposed on the motherboard.

In this embodiment, the male base and the female base may be connected by fastening, fitting, inserting, or the like, and the connection between the battery and the motherboard is achieved by fastening the male base and the female base together.

Therefore, the electronic equipment provided by the utility model comprises the main board, the battery connector and the battery buckling protection circuit, and in a scene of buckling the battery, a system power supply is electrified after the electronic equipment is provided with the battery, but a main board power supply interface is electrified after the electronic equipment with the main board is started. Under the condition that the power-on of the main board power interface is not performed, the second connecting end and the fourth connecting end of the switch module are conducted, and the fourth connecting end is grounded through the pull-down resistor, so that the main board can realize in-place detection of the battery through the main board signal interface, and the starting-up of the equipment is not affected; the second connecting end and the third connecting end of the switch module are conducted under the condition that the power supply interface of the main board is electrified, so that the power supply of the equipment system is electrified, and the condition that the main board IC fails in the process of buckling the battery is avoided. In addition, the utility model does not need to connect a resistor in series on the signal interface of the battery connector, so that the temperature of the battery and the in-situ detection of the battery are not affected.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The battery buckling protection circuit is characterized by comprising a switch module and a pull-down resistor, wherein a first connecting end of the switch module is electrically connected with a main board power interface, a second connecting end of the switch module is electrically connected with a main board signal interface, a third connecting end of the switch module is electrically connected with a connector signal interface, and a fourth connecting end of the switch module is grounded through the pull-down resistor; the connector signal interface is a signal interface of a battery connector arranged on the main board;

2. The battery buckling protection circuit of claim 1, wherein the switch module comprises a first switch tube and a second switch tube, wherein a control pin of the first switch tube and a control pin of the second switch tube are electrically connected and then electrically connected with the main board power interface, a first pin of the first switch tube and a first pin of the second switch tube are electrically connected and then electrically connected with the main board signal interface, a second pin of the first switch tube is electrically connected with the connector signal interface, and a second pin of the second switch tube is grounded through the pull-down resistor;

3. The battery snap-fit protection circuit of claim 2, wherein the control pin of the first switching tube and the control pin of the second switching tube are electrically connected to serve as a first connection terminal of the switching module; the first pin of the first switching tube is electrically connected with the first pin of the second switching tube and then used as a second connecting end of the switching module; the second pin of the first switching tube is used as a third connecting end of the switching module; and the second pin of the second switching tube is used as a fourth connecting end of the switching module.

4. The battery snap-fit protection circuit of claim 2, wherein the first switching tube is an N-channel field effect tube, a gate of the N-channel field effect tube is a control pin of the first switching tube, a drain of the N-channel field effect tube is a first pin of the first switching tube, and a source of the N-channel field effect tube is a second pin of the first switching tube.

5. The battery snap-fit protection circuit of claim 2, wherein the second switching tube is a P-channel field effect tube, a gate of the P-channel field effect tube is a control pin of the second switching tube, a source of the P-channel field effect tube is a first pin of the second switching tube, and a drain of the P-channel field effect tube is a second pin of the second switching tube.

6. The battery snap-fit protection circuit of any of claims 2-5, wherein the first switching tube and the second switching tube are integrated on a single chip.

7. The battery snap-fit protection circuit of claim 1, wherein the pull-down resistor has a resistance equal to a resistance of a resistor connected to the battery identification interface of the battery connector.

8. An electronic device, comprising a main board, a battery connector, and the battery snap protection circuit of any one of claims 1-7, wherein the main board is connected to a battery through the battery connector, and the battery snap protection circuit is disposed on the main board.

9. The electronic device of claim 8, wherein the motherboard is configured to detect whether the battery is in place based on a voltage value of the motherboard signal interface if the motherboard power interface is not powered.

10. The electronic device of claim 8, wherein the battery connector comprises a male mount and a female mount, the male mount and the female mount being detachably connected, one of the male mount and the female mount being disposed on the battery and the other being disposed on the motherboard.