WO2019213915A1

WO2019213915A1 - Charging protection method and device

Info

Publication number: WO2019213915A1
Application number: PCT/CN2018/086379
Authority: WO
Inventors: 张俊彪; 王朝; 罗伟
Original assignee: 华为技术有限公司
Priority date: 2018-05-10
Filing date: 2018-05-10
Publication date: 2019-11-14
Also published as: CN112189292A; CN112189292B

Abstract

Disclosed by the embodiment of the present application is a charging protection method and device, which relates to the technical field of communications. The method and device is able to eliminate the hating caused by series contact impedance and parallel impedance to ground, and prevent a charging port from being burned and melted. The method may comprise: detecting a first temperature of the charging port of a device being charged; when it is detected that the first temperature is greater than or equal to a first threshold and less than a second threshold, reducing a charging current of the device being charged to a first current value, wherein the second threshold is greater than the first threshold; detecting a second temperature of the charging port of the device being charged; and when it is detected that the second temperature is greater than or equal to the second threshold, disconnecting a charging access of the device being charged.

Description

Charging protection method and device

Technical field

The present application relates to the field of communications technologies, and in particular, to a charging protection method and apparatus.

Background technique

Generally, the charging device and the charging port of the device to be charged are connected by a connector, and the electric power is transmitted to realize the charging function. The male and female connectors of the charging port connector have contact resistance when docked. Generally, the contact resistance between the male and female contacts is small, and the amount of heat generated by the charging current flowing through the contact impedance is small and can be ignored. However, as the number of insertions and removals increases, the contact resistance also increases. For example, if the contact impedance is increased to 800 milliohms, 1.8W of power is generated at the male and female contact points when the 1.5A charging current flows. Due to the closed contact point, the heat dissipation is not smooth, and the plastic at the contact point may be burned after a certain period of time, causing the charging port to burn out.

There is also a case where, during the use of the connector, if there is foreign matter such as water ingress, the charging port power supply forms an impedance to the ground, and the impedance causes the charging device output to form a large current loop, and the current is still at the rated output of the charging device. In the range, the impedance heats up when current flows. If the heat is not dissipated, the temperature of the charging port will rise and a burning event may occur.

The contact impedance of the male and female contacts is generally referred to as the series contact impedance, and the impedance formed by the charging port power supply to ground is generally referred to as the parallel impedance to ground. Both the series contact impedance and the parallel impedance to ground may cause the charging port to heat up and a burn-in event occurs. In the charging process, a charging protection method is needed to prevent the series contact impedance and the melting caused by the parallel impedance to the ground.

Summary of the invention

The embodiment of the present application provides a charging protection method and device, which can eliminate the heat generated by the series contact impedance and the parallel impedance to the ground, and prevent the charging port from being burned.

To achieve the above objective, the embodiment of the present application adopts the following technical solutions:

In a first aspect, the present application provides a method of charging protection. The method may include: detecting a first temperature of a charging port of the charged device; and reducing a charging current of the charged device to a first current value after detecting that the first temperature is greater than or equal to the first threshold and less than the second threshold; Detecting a second temperature of the charging port of the charged device; after detecting that the second temperature is greater than or equal to the second threshold, disconnecting the charging path of the charged device; wherein the second threshold is greater than the first threshold. In the method, if it is detected that the first temperature is greater than or equal to the first threshold and less than the second threshold, the heat may be caused by the series contact impedance, the charging current of the charged device is reduced to the first current value, and the series contact impedance is eliminated. If the temperature of the charging port continues to rise and the second temperature is detected to be greater than or equal to the second threshold, it can be determined that the heat is caused by the parallel impedance of the ground, the charging path of the charged device is disconnected, and the parallel contact impedance heating to the ground is eliminated. . In this way, the cause of the heat generation can be separately treated, the series contact resistance heat can be eliminated, the parallel contact resistance heat to the ground can be eliminated, and the probability of a burn-in event occurring in the charging port of the charged device can be reduced.

In a possible design of the first aspect, after reducing the charging current of the charged device to the first current value; detecting the third temperature of the charging port of the charged device; if detecting that the third temperature is less than or equal to the first The three thresholds increase the charging current of the charged device to a second current value, wherein the second current value is greater than the first current value, and the third threshold is less than the first threshold. In this method, if the heat generation is caused by the series contact resistance, after reducing the charging current of the charged device to the first current value, heat generation and temperature drop can be eliminated. After the temperature of the charging port is less than or equal to the third threshold, it is considered that the temperature of the charging port returns to normal, and charging can be continued, and the charging current of the charged device is increased to the second current value to restore the charging function.

In a possible design of the first aspect, after the charging path of the charged device is disconnected, detecting a fourth temperature of the charging port of the charged device; if detecting that the fourth temperature is less than or equal to the third threshold, Passing through the charging path of the charging device and increasing the charging current of the charged device to a second current value, wherein the second current value is greater than the first current value, and the third threshold is less than the first threshold. In this method, if the heat is caused by the parallel contact impedance to the ground, or the heat is caused by the series contact impedance and the parallel contact impedance to the ground, after the charging path of the charged device is disconnected, the heat generation can be eliminated. decline. After the temperature of the charging port is less than or equal to the third threshold, it is considered that the temperature of the charging port returns to normal, and charging can be continued, then the charging path of the charged device is turned on, and the charging current of the charged device is increased to the second current value. Restore the charging function.

In a possible design of the first aspect, detecting the first temperature of the charging port of the charged device includes: detecting a first absolute temperature of the charging port of the charged device; or detecting a charging port of the charged device The temperature difference of a temperature with respect to ambient temperature. Detecting a second temperature of the charging port of the charged device includes: detecting a second absolute temperature of the charging port of the charged device; or detecting a temperature difference of the second temperature of the charging port of the charged device relative to the ambient temperature. Detecting a third temperature of the charging port of the charged device includes: detecting a third absolute temperature of the charging port of the charged device; or detecting a temperature difference of the third temperature of the charging port of the charged device relative to the ambient temperature. Detecting a fourth temperature of the charging port of the charged device includes: detecting a fourth absolute temperature of the charging port of the charged device; or detecting a temperature difference of the fourth temperature of the charging port of the charged device relative to the ambient temperature.

In a possible design of the first aspect, when detecting the first temperature of the charging port of the charged device, when the temperature of the charging port of the charged device is less than the fourth threshold, the periodic detection is periodically detected by the first duration The temperature of the charging port of the charging device, when the temperature of the charging port of the charging device is greater than or equal to the fourth threshold, periodically detecting the temperature of the charging port of the charged device for a second duration; wherein the fourth threshold is less than the third Threshold, the second duration is less than the first duration. In the method, a fourth threshold less than the third threshold is set, and when the temperature of the charging port is less than the fourth threshold, the temperature of the charging port is detected in a long period to save power consumption of the system; When the fourth threshold is greater than or equal to, the temperature of the charging port is detected in a short period to monitor the temperature change in real time.

In a possible design of the first aspect, the first temperature, the second temperature, the third temperature, and the fourth temperature of the charging port of the device to be charged are detected using the thermistor.

In a possible design of the first aspect, the charging current of the device to be charged is controlled to be grounded through the metal oxide semiconductor MOS tube, so that the charging path of the device to be charged is disconnected.

In a second aspect, the present application further provides a charging protection device, which may include: a detection module, a determination module, and a processing module. The detecting module is configured to detect a first temperature of the charging port of the device to be charged; the determining module is configured to determine whether the first temperature is greater than or equal to the first threshold and less than the second threshold; and the processing module is configured to determine the detection in the determining module. After the first temperature is greater than or equal to the first threshold and less than the second threshold, reducing the charging current of the charged device to the first current value; the detecting module is further configured to detect the second temperature of the charging port of the charged device; The module is further configured to determine whether the second temperature is greater than or equal to the second threshold; and the processing module is further configured to: after the determining module determines that the second temperature is greater than or equal to the second threshold, disconnect the charging path of the charged device Wherein the second threshold is greater than the first threshold.

In a possible design of the second aspect, the detecting module is further configured to detect a third temperature of the charging port of the charged device; the determining module is further configured to determine whether the third temperature is detected to be less than or equal to the third threshold, where The third threshold is less than the first threshold; the processing module is further configured to: after reducing the charging current of the charged device to the first current value, if the determining module determines that the third temperature is detected to be less than or equal to the third threshold, the increase is The charging current of the charging device is to a second current value, wherein the second current value is greater than the first current value.

In a possible design of the second aspect, the detecting module is further configured to detect a fourth temperature of the charging port of the charged device; the determining module is further configured to determine whether the fourth temperature is detected to be less than or equal to the third threshold, where The third threshold is less than the first threshold; the processing module is further configured to: after the charging circuit of the charged device is disconnected, if the determining module determines that the fourth temperature is detected to be less than or equal to the third threshold, turning on the charging path of the charged device And increasing the charging current of the charged device to a second current value, wherein the second current value is greater than the first current value.

In a possible design of the second aspect, the detecting module detects the first temperature of the charging port of the charged device, specifically: detecting a first absolute temperature of the charging port of the charged device; or detecting charging of the charged device The temperature difference of the first temperature of the port relative to the ambient temperature. The detecting module detects a second temperature of the charging port of the charged device, specifically: detecting a second absolute temperature of the charging port of the charged device; or detecting a temperature difference of the second temperature of the charging port of the charged device relative to the ambient temperature . The detecting module detects a third temperature of the charging port of the charged device, specifically: detecting a third absolute temperature of the charging port of the charged device; or detecting a temperature difference of the third temperature of the charging port of the charged device relative to the ambient temperature . The detecting module detects a fourth temperature of the charging port of the charged device, specifically: detecting a fourth absolute temperature of the charging port of the charged device; or detecting a temperature difference of the fourth temperature of the charging port of the charged device relative to the ambient temperature .

In a possible design of the second aspect, the detecting module detects the first temperature of the charging port of the charged device, and specifically includes: when the temperature of the charging port of the charged device is less than the fourth threshold, in the first time period Periodically detecting the temperature of the charging port of the charged device. When the temperature of the charging port of the charged device is greater than or equal to the fourth threshold, periodically detecting the temperature of the charging port of the charged device for a second duration; The fourth threshold is less than the third threshold, and the second duration is less than the first duration.

In a possible design of the second aspect, the detecting module detects the first temperature of the charging port of the charged device, and specifically includes: the detecting module detects the first temperature of the charging port of the charged device by using the thermistor. The detecting module detects the second temperature of the charging port of the charged device, and specifically includes: detecting a second temperature of the charging port of the charged device by using the thermistor. The detecting module detects the third temperature of the charging port of the charged device, and specifically includes: detecting a third temperature of the charging port of the charged device by using the thermistor. The detecting module detects the fourth temperature of the charging port of the charged device, and specifically includes: detecting a fourth temperature of the charging port of the charged device by using the thermistor.

In a possible design of the second aspect, the processing module disconnects the charging path of the charged device, and specifically includes: the processing module controls the charging current of the charged device to be grounded through the metal oxide semiconductor MOS tube.

In a third aspect, the present application further provides a charging protection device, the device comprising: a processor, a memory, and a communication interface. The communication interface is used to support communication between the device and other devices, which may be transceivers or transceiver circuits. The memory is coupled to a processor, the memory comprising a non-volatile storage medium for storing computer program code, the computer program code comprising computer instructions. The processor is configured to detect a first temperature of the charging port of the charged device when the processor executes the computer instruction, and reduce the charged device after detecting that the first temperature is greater than or equal to the first threshold and less than the second threshold Charging current to the first current value; detecting a second temperature of the charging port of the charged device; and after detecting that the second temperature is greater than or equal to the second threshold, disconnecting the charging path of the charged device; wherein the second threshold Greater than the first threshold.

In a possible design of the third aspect, the processor is configured to detect a third temperature of the charging port of the charged device after reducing the charging current of the device to be charged to the first current value; The third temperature is less than or equal to the third threshold, and the charging current of the charged device is increased to a second current value; wherein the second current value is greater than the first current value, and the third threshold is less than the first threshold. In a possible design of the third aspect, the processor is configured to detect a fourth temperature of the charging port of the charged device after disconnecting the charging path of the charged device; and if the fourth temperature is detected to be less than or equal to The third threshold is to turn on the charging path of the charged device, and increase the charging current of the charged device to the second current value; wherein the third threshold is less than the first threshold, and the second current value is greater than the first current value.

In a possible design of the third aspect, the processor is configured to detect a first absolute temperature of a charging port of the charged device; or detect a temperature of the first temperature of the charging port of the charged device relative to an ambient temperature Poor; the processor is further configured to detect a second absolute temperature of the charging port of the charged device; or detect a temperature difference of the second temperature of the charging port of the charged device relative to the ambient temperature; the processor is further used to Detecting a third absolute temperature of the charging port of the charged device; or detecting a temperature difference of the third temperature of the charging port of the charged device relative to the ambient temperature; the processor is further configured to detect a charging port of the charged device Four absolute temperatures; or, detecting a temperature difference of the fourth temperature of the charging port of the charging device with respect to the ambient temperature.

In a possible design of the third aspect, the processor is configured to periodically detect the temperature of the charging port of the charged device in a first duration when the temperature of the charging port of the charged device is less than the fourth threshold. When the temperature of the charging port of the charged device is greater than or equal to the fourth threshold, the temperature of the charging port of the charged device is periodically detected for a second duration; wherein the fourth threshold is less than the third threshold, and the second duration is less than The first time.

In a possible design of the third aspect, the processor is configured to detect a first temperature of a charging port of the device to be charged by using the thermistor; the processor is further configured to detect the device to be charged by using the thermistor a second temperature of the charging port; the processor is further configured to detect a third temperature of the charging port of the charged device by using the thermistor; the processor is further configured to detect the charging port of the charged device by using the thermistor Four temperatures.

In a possible design of the third aspect, the processor is configured to control a charging current of the charged device to be grounded through the metal oxide semiconductor MOS tube to implement a charging path for disconnecting the charged device.

The application also provides a computer readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the method of any of the above aspects.

The application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the above aspects.

The present application also provides a chip system including a processor, and may further include a memory and a transceiver circuit for implementing the method described in any of the above aspects.

Any of the devices or computer storage media or computer program products or chip systems provided above are used to perform the corresponding methods provided above, and therefore, the beneficial effects that can be achieved can be referred to the corresponding methods provided above. The beneficial effects of the corresponding scheme will not be described here.

DRAWINGS

1 is a schematic diagram of a charging system to which the technical solution provided by the embodiment of the present application is applied;

2 is a schematic diagram of a charging port of a charged device to which the technical solution provided by the embodiment of the present application is applied;

FIG. 3 is a schematic structural diagram 1 of a charged device according to a technical solution provided by an embodiment of the present disclosure;

FIG. 4 is a second schematic structural diagram of a device to be charged according to the technical solution provided by the embodiment of the present application; FIG.

FIG. 5 is a schematic diagram 1 of a charging protection method according to an embodiment of the present application; FIG.

FIG. 6 is a second schematic diagram of a charging protection method according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram 1 of a charging protection device according to an embodiment of the present application; FIG.

FIG. 8 is a schematic structural diagram 2 of a charging protection device according to an embodiment of the present application.

detailed description

The charging protection method and apparatus provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

The technical solution provided by the present application can be applied to any charged device in which a charging port exists. For example, the device to be charged may be a mobile terminal, a digital device, a mobile phone, a tablet, or the like. The charged device is connected to the charging device through a charging port. The charging device can be any device capable of providing a charging source for the device being charged, such as a charger, a portable charging device, a wireless charger, a rechargeable battery, and the like.

The technical solution provided by the present application can be applied to the charging system shown in FIG. 1, including a charging device and a charged device. The device to be charged includes a control unit, a detecting unit, a charging management unit, a charging port, a protection device, and a load. The control unit is used to control various units and modules in the device to be charged, for example, to send control commands, to control the charge management unit to reduce the current of the input load, to load and operate the operating system of the device to be charged, and the like. The detecting unit is configured to detect the status of each module and the unit in the charged device, for example, detecting the temperature near the charging port of the charged device. The charging management unit is used to manage the charging process, realize functions such as managing charging, discharging, and power consumption management, and perform charging of the load with a suitable current; for example, the charging management unit may be a charging chip for adjusting the current of the input load size. The charging port is an interface for connecting charging devices, and there are various types, such as Micro B, min USB, micro USB, type C, and the like. For example, the charging port may be of the structure shown in FIG. 2, and the female end of the charging port is connected to the charging device or the male connector of the connector. The protection device is used to adjust the current and voltage in the circuit by turning on or off to achieve the purpose of protecting the charging port. For example, the protection device may be a metal oxide semiconductor (MOS) tube. When the MOS transistor is turned on, the charging device is protected due to the low impedance of the MOS transistor, and no current is output, thereby protecting the device to be charged. The load is used to provide power to the entire charged device, for example, the load can be a rechargeable battery.

In the embodiment of the present invention, the device to be charged may be a mobile terminal device or a non-mobile terminal device. The mobile terminal device can be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a car terminal, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA). The non-mobile terminal device may be a personal computer (PC), a television (Television, TV), a teller machine, a kiosk, etc., and is not specifically limited in the embodiment of the present invention.

FIG. 3 is a schematic diagram showing the hardware structure of a charged device 100 for implementing various embodiments of the present invention. As shown in FIG. 3, the charged device 100 includes, but is not limited to, a radio frequency unit 101, a network module 102, an audio output unit 103, an input unit 104, a sensor 105, a display unit 106, a user input unit 107, an interface unit 108, and a memory 109. , processor 110, and power supply 111 and other components. It will be understood by those skilled in the art that the structure of the device to be charged 100 shown in FIG. 3 does not constitute a limitation on the device to be charged, and the device to be charged 100 may include more or less components than those illustrated, or combine some components. , or different parts layout. In the embodiment of the present invention, the charged device 100 includes but is not limited to a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a vehicle terminal, a wearable device, a UMPC, a netbook, a PDA, a PC, a TV, a teller machine, or a kiosk.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 101 can be used for receiving and transmitting signals during the transmission and reception of information or a call, and specifically, after receiving downlink data from the base station, processing the processor 110; The uplink data is sent to the base station. In general, radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio unit 101 can also communicate with the network and other devices through a wireless communication system.

The charged device 100 provides wireless broadband Internet access to the user through the network module 102, such as helping the user to send and receive emails, browse web pages, and access streaming media.

The audio output unit 103 can convert the audio data received by the radio frequency unit 101 or the network module 102 or stored in the memory 109 into an audio signal and output as sound. Moreover, the audio output unit 103 can also provide an audio output related to a particular function performed by the charging device 100. The audio output unit 103 includes a speaker, a buzzer, a receiver, and the like.

The input unit 104 is for receiving an audio or video signal. The input unit 104 may include a graphics processing unit (GPU) 1041 and a microphone 1042 that images an still picture or video obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The data is processed. The processed image frame can be displayed on the display unit 106. The image frames processed by the graphics processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio unit 101 or the network module 102. The microphone 1042 can receive sound (eg, receive voice information input by a user) and can process such sound as audio data. The processed audio data can be converted to a format output that can be transmitted to the mobile communication base station via the radio unit 101 in the case of a telephone call mode.

The device 100 to be charged also includes at least one type of sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 1061 according to the brightness of the ambient light, and the proximity sensor can close the display panel 1061 when the charged device 100 moves to the ear. And / or backlight. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (usually three axes), and the magnitude and direction of gravity can be detected at rest, which can be used to identify the posture of the device 100 to be charged (such as horizontal and vertical screen switching, Related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; sensor 105 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, Thermometers, infrared sensors, etc., will not be described here.

The display unit 106 is for displaying information input by the user or information provided to the user. The display unit 106 can include a display panel 1061. The display panel 1061 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

The user input unit 107 can be configured to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the device 100 being charged. Specifically, the user input unit 107 includes a touch panel 1071 and other input devices 1072. The touch panel 1071, also referred to as a touch screen, can collect touch operations on or near the user (such as the user using a finger, a stylus, or the like on the touch panel 1071 or near the touch panel 1071. operating). The touch panel 1071 may include two parts of a touch detection device and a touch controller. Wherein, the touch detection device detects the touch orientation of the user, and detects a signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts the touch information into contact coordinates, and sends the touch information. To the processor 110, the commands sent by the processor 110 are received and executed. In addition, the touch panel 1071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 1071, the user input unit 107 may also include other input devices 1072. Specifically, the other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (such as a volume control button, a switch button, etc.), a trackball, a mouse, and a joystick, which are not described herein.

Further, the touch panel 1071 can be overlaid on the display panel 1061. After the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits to the processor 110 to determine the type of the touch event, and then the processor 110 according to the touch. The type of event provides a corresponding visual output on display panel 1061. Although in FIG. 3, the touch panel 1071 and the display panel 1061 are two independent components to implement the input and output functions of the device 100 to be charged, in some embodiments, the touch panel 1071 and the display panel may be The 1061 is integrated to implement the input and output functions of the device 100 to be charged, which is not limited herein.

The interface unit 108 is an interface in which an external device is connected to the device 100 to be charged. For example, the external device may include a wired or wireless headset port, an external power (or battery charger) port (such as the charging port in Figure 1), a wired or wireless data port, a memory card port, for connecting with an identification module The device's port, audio input/output (I/O) port, video I/O port, headphone port, and more. The interface unit 108 can be configured to receive input from an external device (eg, data information, power, etc.) and transmit the received input to one or more components within the device 100 being charged or can be used at the device 100 being charged Transfer data to and from external devices.

Memory 109 can be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may be stored according to Data created by the use of the mobile phone (such as audio data, phone book, etc.). Further, the memory 109 may include a high speed random access memory, and may also include a nonvolatile memory such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 110 is a control center of the charged device 100, connecting various portions of the entire charged device 100 with various interfaces and lines, by running or executing software programs and/or modules stored in the memory 109, and calling stored in the memory. The data in 109 performs various functions and processing data of the device 100 to be charged, thereby performing overall monitoring of the device 100 to be charged. The processor 110 may include one or more processing units; optionally, the processor 110 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, an application, etc., and a modulation solution The processor mainly handles wireless communication. It can be understood that the above modem processor may not be integrated into the processor 110.

The charged device 100 may further include a power source 111 (such as a battery) for supplying power to various components. Alternatively, the power source 111 may be logically connected to the processor 110 through a power management system to manage charging, discharging, and power through the power management system. Consumption management and other functions. For example, the power source 111 can be the load in FIG. 1, and functions such as managing charging, discharging, and power consumption management are implemented by the charging management unit of FIG.

In addition, the charged device 100 includes some functional modules not shown, and details are not described herein again.

The charging protection method proposed in the present application can be applied to the above-mentioned charged device to prevent the charging port from being burnt due to the series contact impedance and/or the parallel impedance to the ground during the charging process.

Some of the terms involved in this application are explained below to facilitate the reader's understanding:

1, series contact impedance, parallel impedance to ground

Generally, the contact impedance of the male and female contacts is called the series contact impedance; the impedance formed by the charging port power supply to the ground is called the parallel impedance to ground. The series contact resistance is generally caused by multiple insertion and removal of the male and female ends; the parallel impedance to ground is generally an interface micro short circuit caused by foreign matter such as water ingress. The relationship between the series contact impedance and the parallel impedance to ground and the load in the circuit is shown in Figure 4. In Fig. 4, V denotes the positive electrode of the charging device, and GND (Ground) is the negative electrode of the charging device.

2. The term "plurality" as used herein refers to two or more. The terms "first" and "second" are used herein to distinguish different objects, rather than to describe a particular order of the objects. For example, the first threshold and the second threshold are used to distinguish different thresholds, rather than to describe a particular order of thresholds. The term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.

In the embodiments of the present application, the words "exemplary" or "such as" are used to mean an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the words "exemplary" or "such as" is intended to present the concepts in a particular manner.

The embodiment of the present application provides a charging protection method, which can be applied to the system or device shown in FIG. 1 to FIG. 3. In the method, the heat generated by the series contact impedance and the parallel impedance to the ground can be identified, and corresponding protection measures are implemented to prevent the series contact impedance and the parallel connection impedance to the ground to generate heat by burning. As shown in FIG. 5, the method may include S101-S105:

S101. Detect a temperature of a charging port of the charged device. If it is detected that the first temperature is greater than or equal to the first threshold and less than the second threshold, S102 is performed.

Specifically, during the charging function, the charging device and the charged device are connected through the charging port, and the temperature of the charging port of the charged device is detected.

Optionally, during the charging function, the charging device and the charged device are connected through the charging port, and the temperature of the charging port of the charged device is periodically detected.

In one implementation, the thermistor can be utilized to detect the temperature of the charging port. The thermistor can be placed in the charged device near the charging port. As the temperature of the charging port changes, the resistance of the thermistor also changes. By monitoring the resistance of the thermistor, the temperature of the charging port can be obtained. For example, a Negative Temperature Coefficient (NTC) can be placed near the charging port of the device being charged. For example, the detecting unit in FIG. 1 periodically detects the resistance value of the NTC and reports it to the control unit, that is, the control unit periodically acquires the temperature of the charging port of the device to be charged.

Optionally, if it is detected that the temperature of the charging port of the charged device is the first temperature, the first temperature is greater than or equal to the first threshold, and is less than the second threshold, then S102 is performed to reduce the charging current of the charged device. The first threshold is smaller than the second threshold; the first threshold is a threshold for determining the thermal resistance of the series contact impedance, and the second threshold is a threshold for determining the parallel impedance heating to the ground. Illustratively, the first threshold is 40 degrees Celsius and the second threshold is 48 degrees Celsius. After detecting that the first temperature is greater than or equal to the first threshold and less than the second threshold, reducing the charging current of the device being charged, the heat generation of the series contact resistance can be eliminated. For example, the control unit in FIG. 1 notifies the charging management unit after determining that the temperature of the charging port is greater than or equal to the first threshold, and the charging management unit reduces the charging current through the load. Thus, the current through the series contact impedance is also reduced, and the heat generation caused by the series contact resistance can be improved.

If the temperature of the charging port is lowered after reducing the charging current of the device to be charged, it can be determined that the heating of the charging port is mainly caused by the series contact resistance. If the temperature of the charging port continues to rise after decreasing the charging current of the charged device, and rises to be greater than or equal to the second threshold, it can be determined that the heating of the charging port is mainly caused by the parallel impedance to ground.

Optionally, in periodically detecting the temperature of the charging port of the charged device, a fourth threshold may be set, where the fourth threshold is less than the first threshold. Illustratively, the fourth threshold is 30 degrees Celsius. When detecting that the temperature of the charging port of the charged device is less than the fourth threshold, periodically detecting the temperature of the charging port of the charged device in a first duration; detecting that the temperature of the charging port of the charged device is greater than or equal to the first In the case of four thresholds, the temperature of the charging port of the device to be charged is periodically detected in a second duration; wherein the second duration is less than the first duration. For example, the first duration is 10s; the second duration is 0.3s. When the temperature of the charging port is less than the fourth threshold, the period of detecting the temperature of the charging port is long, which can save system power consumption; when the temperature of the charging port is greater than or equal to the fourth threshold, the temperature of the charging port is detected. The shorter cycle allows for faster, real-time detection of temperature changes.

S102. Reduce charging current of the device to be charged.

Specifically, reducing the charging current of the charged device may include reducing a charging current of the charged device to a first current value. Alternatively, reducing the charging current of the device to be charged may be notified by the control unit in FIG. 1 to the charging management unit.

Wherein, the first current value can be set to be much smaller than the value of the charging current during normal charging of the charged device. Illustratively, the charging current during normal charging of the charged device is 1.5A, and the first current value can be set to 100mA. Illustratively, the first current value can also be set to 0 mA.

S103. Detect a temperature of a charging port of the device to be charged. If it is detected that the second temperature is greater than or equal to the second threshold, S104 is performed; if it is detected that the third temperature is less than or equal to the third threshold, S107 is performed.

Specifically, after reducing the charging current of the charged device, the temperature of the charging port of the charged device is continuously detected.

Alternatively, the temperature of the charging port of the charged device may be periodically detected after reducing the charging current of the charged device.

If the heating of the charging port is mainly caused by the series contact resistance, after the charging current of the charged device is reduced, the temperature of the charging port is lowered, and the charging function of the charged device can be restored. Optionally, if it is detected that the temperature of the charging port is the third temperature, and the third temperature is less than or equal to the third threshold, perform S107 to restore the charging current of the charged device. The third threshold is less than the first threshold, and the third threshold is greater than the fourth threshold. Illustratively, the third threshold is 36 degrees Celsius.

If the heating of the charging port is mainly caused by the parallel impedance to the ground, after reducing the charging current of the charged device, the current through the parallel impedance to the ground does not decrease, the parallel impedance to the ground continues to heat up, and the temperature of the charging port rises. If it is detected that the temperature of the charging port is the second temperature and the second temperature is greater than or equal to the second threshold, S104 is performed.

S104. Disconnect the charging path of the charged device.

In one implementation, the charging path of the device being charged can be disconnected by the protection device of FIG. For example, the protection device in Figure 1 is a MOS tube. The protection device is opened by the control unit in FIG. 1, that is, the MOS tube is turned on, the charging current of the charged device is controlled to be grounded through the MOS tube, the load of the charged device is short-circuited, the charging device is triggered to start protection, and the charging device does not output current, The charging path of the device being charged is disconnected.

S105. Detect a temperature of a charging port of the device to be charged. If it is detected that the fourth temperature is less than or equal to the third threshold, S106 and S107 are performed.

Specifically, after disconnecting the charging path of the charged device, the temperature of the charging port of the charged device is continuously detected.

Optionally, the temperature of the charging port of the charged device may be periodically detected after disconnecting the charging path of the charged device.

After the charging path of the device to be charged is disconnected, since the charging device does not output the current in parallel to the impedance, the heat generated by the parallel impedance to the ground can be eliminated, and the temperature of the charging port is lowered. If it is detected that the temperature of the charging port is the fourth temperature, and the fourth temperature is less than or equal to the third threshold, S106 and S107 are performed, the charging path of the charged device is turned on, and the charging current of the charged device is restored, and the charged device is restored. Charging function.

S106. Turn on the charging path of the device to be charged.

Optionally, the protection device is turned off by the control unit in FIG. 1, that is, the MOS tube is turned off, and the charging path of the charged device is turned on.

S107. Restore the charging current of the charged device.

Specifically, the charging current of the charged device is restored to increase the charging current of the charged device to a second current value, wherein the second current value is greater than the first current value. Illustratively, the second current value is set to a charging current during normal charging of the charging device, such as 1.5A. Alternatively, restoring the charging current of the charged device may be notified by the control unit in FIG. 1 to the charging management unit. After the charging management unit performs a current that increases the load input to the charged device to the second current value, the charging device and the charged device perform a charging function through the charging port.

Optionally, in a specific implementation, after the MOS transistor is turned off in S106, a delay is set, for example, a delay of 1 ms, and then S107 is performed to restore the charging current of the charged device. In this way, by setting the delay, the delay of turning off the MOSFET can be cancelled. After the MOS transistor is successfully turned off, the charging current of the charged device is resumed.

In the above embodiment, detecting the temperature of the charging port of the charged device may be detecting the absolute temperature of the charging port of the charged device; optionally, detecting the temperature of the charging port of the charged device may also be detecting the charging port of the charged device. Relative temperature. Optionally, in conjunction with FIG. 5, as shown in FIG. 6, before the step S101, the charging protection method provided by the embodiment of the present application may further include S100:

S100. Detect an ambient temperature of the device to be charged.

Specifically, the ambient temperature of the device to be charged can be detected by the thermistor. For example, a thermistor is placed on the battery protection board of the device being charged. When the charged device does not perform the charging function, the detecting unit in FIG. 1 detects the resistance value of the thermistor and notifies the control unit, and the control unit acquires the temperature of the battery protection panel, that is, the ambient temperature.

Optionally, the temperature of the charging port of the charged device is detected in S101, S103, and S105, specifically, detecting a temperature difference between an absolute temperature of the charging port of the charging device and an ambient temperature, that is, detecting a relative charging port of the charged device. temperature.

Correspondingly, the first temperature, the second temperature, the third temperature, and the fourth temperature in S101-S107 are respectively a temperature difference between an absolute temperature of a charging port of the charging device and an ambient temperature; a first threshold, a second threshold, The values of the third threshold and the fourth threshold may also be set for the corresponding temperature. Exemplarily, the ambient temperature is 28 degrees Celsius, and the first threshold, the second threshold, the third threshold, and the fourth threshold may be respectively set to 12 degrees Celsius, 20 degrees Celsius, 8 degrees Celsius, and 2 degrees Celsius.

After the relative temperature of the charging port of the device to be charged is detected, the specific charging protection method is as described in S101-S107, and details are not described herein again.

The charging protection method provided by the embodiment of the present application reduces the charging current input to the charged device after detecting the heat generated by the series contact impedance during the charging process, and detects the heat generated by the parallel impedance to the ground, and then disconnects and is charged. The charging path of the device is separately processed according to the cause of the fever; the series contact resistance heating can be eliminated, the parallel contact resistance heating can be eliminated, and the probability of the burning event of the charging port of the charging device is reduced.

The solution provided by the embodiment of the present application is mainly introduced from the perspective of the device to be charged. It can be understood that the charged device includes a corresponding hardware structure and/or software module for performing each function in order to implement the above functions. Those skilled in the art will readily appreciate that the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

The embodiment of the present application may divide the function module by the charging device according to the foregoing method example. For example, each function module may be divided according to each function, or two or more functions may be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner. The following is an example of dividing each functional module by using corresponding functions.

FIG. 7 is a schematic diagram of the logical structure of the device 700 provided by the embodiment of the present application. The device 700 may be a device to be charged, such as a user device, and can implement the function of the device to be charged in the method provided by the embodiment of the present application. The device 700 can also be capable of The device that supports the function of the charged device in the method provided by the embodiment of the present application is supported by the charging device. Apparatus 700 can be a hardware structure, a software module, or a hardware structure plus a software module. Device 700 can be implemented by a chip system. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in FIG. 7, the apparatus 700 includes a detection module 701, a determination module 702, and a processing module 703. The detection module 701 can be used to perform S101, S103, and S105 in FIG. 5, or S100, S101, S103, and S105 in FIG. 6, and/or perform other steps described in this application. The decision module 702 can be used to perform the determining steps of FIG. 5 or FIG. 6, and/or perform other steps described in this application. The processing module 703 can be used to perform S102, S104, S106, and S107 in FIG. 5 or FIG. 6, and/or perform other steps described in this application.

In an example of the present application, the detecting module 701 in FIG. 7 can be implemented by the detecting unit in FIG. 1, the determining module 702 can be implemented by the control unit in FIG. 1, and the processing module 703 can pass the charging management unit in FIG. And / or control unit implementation.

All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

In the present embodiment, the apparatus 700 can be presented in a form that divides the various functional modules in an integrated manner. A "module" herein may refer to a particular ASIC, circuitry, processor and storage device that executes one or more software or firmware programs, integrated logic circuitry, and/or other devices that provide the functionality described above.

In a simple embodiment, those skilled in the art will appreciate that device 700 can take the form shown in FIG.

As shown in FIG. 8, device 800 can include a memory 801, a processor 802, and a communication interface 803. The memory 802 is used to store the instructions. When the device 800 is running, the processor 802 executes the instructions stored in the memory 801 to enable the device 800 to perform the charging protection method provided by the embodiment of the present application. The memory 801, the processor 802, and the communication interface 803 are communicably connected by a bus 804. For specific charging protection methods, refer to the related descriptions in the above and the drawings, and details are not described herein again. It should be noted that the device 800 may also include other hardware devices in a specific implementation process, which are not enumerated herein. In one possible implementation, the memory 801 can also be included in the processor 802.

In one example of the present application, the detection module 701, the determination module 702, and the processing module 703 in FIG. 7 may be implemented by the processor 802.

The communication interface 803 can be a circuit, a device, an interface, a bus, a software module, a transceiver, or any other device that can implement communication. The processor 802 can be a Field-Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a System on Chip (SoC), and a Central Processor Unit (Central Processor Unit). CPU), Network Processor (NP), Digital Signal Processor (DSP), Micro Controller Unit (MCU), Programmable Logic Device (PLD) Or other integrated chips. The memory 801 includes a volatile memory such as a random access memory (RAM); the memory may also include a non-volatile memory such as a flash memory. , Hard Disk Drive (HDD) or Solid-State Drive (SSD); the memory may also include a combination of the above types of memory; the memory may also include any other device having a storage function, such as a circuit, device or software Module.

The device provided in the embodiment of the present application can be used to perform the above-mentioned charging protection method. Therefore, the technical effects that can be obtained can be referred to the foregoing method embodiments, and details are not described herein again.

A person skilled in the art may know that all or part of the above steps may be completed by hardware related to program instructions, and the program may be stored in a computer readable storage medium such as a ROM, a RAM, an optical disc, or the like. .

The embodiment of the present application further provides a storage medium, which may include a memory 801.

For the explanation and beneficial effects of the related content in any of the above-mentioned devices, reference may be made to the corresponding method embodiments provided above, and details are not described herein again.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device that includes one or more servers, data centers, etc. that can be integrated with the media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a digital video disc (DVD)), or a semiconductor medium (such as a solid state disk (SSD)). Wait.

Although the present application has been described herein in connection with the various embodiments, those skilled in the art can Other variations of the disclosed embodiments are achieved. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill several of the functions recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that the measures are not combined to produce a good effect.

While the present invention has been described in connection with the specific embodiments and embodiments thereof, various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the description and drawings are to be regarded as It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

A charging protection method, comprising:

Detecting a first temperature of a charging port of the charged device;

After detecting that the first temperature is greater than or equal to the first threshold and less than the second threshold, reducing a charging current of the charged device to a first current value; wherein the second threshold is greater than the first threshold ;

Detecting a second temperature of a charging port of the charged device;

After detecting that the second temperature is greater than or equal to the second threshold, disconnecting the charging path of the charged device.
The charging protection method according to claim 1, wherein after the charging current of the charged device is reduced to a first current value; the method further comprises:

Detecting a third temperature of a charging port of the charged device;

If it is detected that the third temperature is less than or equal to the third threshold, increasing a charging current of the charged device to a second current value, where the second current value is greater than the first current value; wherein The third threshold is less than the first threshold.
The charging protection method according to claim 1 or 2, wherein after the charging path of the charged device is disconnected, the method further comprises:

Detecting a fourth temperature of a charging port of the charged device;

If it is detected that the fourth temperature is less than or equal to the third threshold, turning on the charging path of the charged device, and increasing the charging current of the charged device to a second current value, the second current value Greater than the first current value; wherein the third threshold is less than the first threshold.
A charging protection method according to any one of claims 1 to 3, characterized in that

The detecting the first temperature of the charging port of the charged device includes:

Detecting a first absolute temperature of a charging port of the charged device;

Or detecting a temperature difference of the first temperature of the charging port of the charged device relative to the ambient temperature;

The detecting the second temperature of the charging port of the charged device includes:

Detecting a second absolute temperature of a charging port of the charged device;

Or, detecting a temperature difference of the second temperature of the charging port of the charged device with respect to the ambient temperature.
The charging protection method according to any one of claims 2 to 4, wherein the detecting the first temperature of the charging port of the charged device comprises:

When the temperature of the charging port of the charged device is less than the fourth threshold, periodically detecting the temperature of the charging port of the charged device in a first duration, the fourth threshold being less than the third threshold;

In a case where the temperature of the charging port of the charged device is greater than or equal to the fourth threshold, the temperature of the charging port of the charged device is periodically detected for a second duration; the second duration is less than the first duration.
A charging protection method according to any one of claims 1 to 5, characterized in that

The detecting the first temperature of the charging port of the charged device includes:

Using a thermistor to detect a first temperature of a charging port of the device to be charged;

The detecting the second temperature of the charging port of the charged device includes:

A thermistor is used to detect a second temperature of the charging port of the device being charged.
The charging protection method according to any one of claims 1 to 6, wherein the disconnecting the charging path of the charged device comprises: controlling a charging current of the charged device through a metal oxide semiconductor MOS The pipe is grounded.
A charging protection device, comprising:

a detecting module, configured to detect a first temperature of a charging port of the charged device;

a determining module, configured to determine whether the first temperature is greater than or equal to a first threshold and less than a second threshold; wherein the second threshold is greater than the first threshold;

a processing module, configured to: after the determining module determines that the first temperature is greater than or equal to a first threshold and less than a second threshold, reducing a charging current of the charged device to a first current value;

The detecting module is further configured to detect a second temperature of the charging port of the charged device;

The determining module is further configured to determine whether the second temperature is greater than or equal to a second threshold;

The processing module is further configured to disconnect the charging path of the charged device after the determining module determines that the second temperature is greater than or equal to the second threshold.
The charging protection device according to claim 8, wherein

The detecting module is further configured to detect a third temperature of the charging port of the charged device;

The determining module is further configured to determine whether the third temperature is less than or equal to a third threshold; wherein the third threshold is smaller than the first threshold;

The processing module is further configured to: after the charging current of the charged device is reduced to a first current value, if the determining module determines that the third temperature is detected to be less than or equal to a third threshold, increase the location The charging current of the charged device is to a second current value, and the second current value is greater than the first current value.
A charging protection device according to claim 8 or 9, wherein

The detecting module is further configured to detect a fourth temperature of the charging port of the charged device;

The determining module is further configured to determine whether the fourth temperature is less than or equal to a third threshold; wherein the third threshold is smaller than the first threshold;

The processing module is further configured to: after disconnecting the charging path of the charged device, if the determining module determines that the fourth temperature is detected to be less than or equal to a third threshold, turning on the charged device And charging a charging path, and increasing a charging current of the charged device to a second current value, the second current value being greater than the first current value.
A charging protection device according to any one of claims 8 to 10, characterized in that

The detecting module detects the first temperature of the charging port of the device to be charged, and specifically includes:

The detecting module detects a first absolute temperature of a charging port of the charged device;

Or the detecting module detects a temperature difference of the first temperature of the charging port of the charged device with respect to the ambient temperature;

The detecting module detects a second temperature of the charging port of the device to be charged, and specifically includes:

The detecting module detects a second absolute temperature of a charging port of the charged device;

Alternatively, the detection module detects a temperature difference of the second temperature of the charging port of the charged device relative to the ambient temperature.
The charging protection device according to any one of claims 9-11, wherein the detecting module detects the first temperature of the charging port of the device to be charged, and specifically includes:

When the temperature of the charging port of the charged device is less than the fourth threshold, periodically detecting the temperature of the charging port of the charged device in a first duration, the fourth threshold being less than the third threshold;

In a case where the temperature of the charging port of the charged device is greater than or equal to the fourth threshold, the temperature of the charging port of the charged device is periodically detected for a second duration; the second duration is less than the first duration.
A charging protection device according to any one of claims 8 to 12, characterized in that

The detecting module detects the first temperature of the charging port of the device to be charged, and specifically includes:

The detecting module detects a first temperature of a charging port of the charged device by using the thermistor;

The detecting module detects a second temperature of the charging port of the device to be charged, and specifically includes:

The detection module detects a second temperature of a charging port of the charged device using the thermistor.
The charging protection device according to any one of claims 8 to 13, wherein the processing module disconnects the charging path of the charged device, and specifically includes:

The processing module controls the charging current of the charged device to be grounded through the metal oxide semiconductor MOS tube.
A chip, comprising: a processor and a transceiver circuit, the transceiver circuit coupled to the processor, the processor for running a computer program or instructions to implement any of claims 1-7 The method of the item, the transceiver circuit is configured to communicate with other modules than the chip.
A computer readable storage medium, wherein the computer readable storage medium stores a computer program or instructions, when the computer program or instructions are executed, implementing the method of any one of claims 1-7 Methods.
A computer program product, characterized in that the computer program product comprises instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-7.