CN104767180B - The guard method of USB interface large current charge and system - Google Patents

Abstract

The guard method of USB interface large current charge and system, for detecting the temperature at USB interface both ends, if being not above threshold value, export charging current by distinguishing set temperature detection module at the both ends of USB interface.If more than threshold value, the electric current output of USB interface is cut off.Thus can avoid because electric current is excessive cause temperature excessively high due to burn out USB interface, so as to fulfill the protecting effect of USB interface large current charge.

Description

USB interface high-current charging protection method and system

technical field

The invention relates to large circuit charging protection, in particular to a USB interface large current charging protection method and system which are easy to operate.

Background technique

At present, the charging current through the USB cable is mostly set within 2A. A high-current charger produced by LITE-ON has a maximum current of 5V/3A, but it does not have any protection on the USB interface. For high-current charging, if there is no protection on the interface, once the USB interface is short or poorly connected, it is easy to cause local overheating at the USB interface, which may cause the USB port to burn or even catch fire. For example, for a 5V/3A charger, when the positive pole and the negative pole are slightly short to produce a resistance of 2 ohms, it will generate a heating power of 5*5/2=12.5W. The USB interface cannot withstand such a large amount of heat.

Contents of the invention

Based on this, it is necessary to provide an easy-to-operate USB interface high-current charging protection method.

A USB interface high-current charging protection method, comprising the following steps:

Detect the temperature at both ends of the USB interface, and judge whether the detected temperature exceeds the threshold;

If so, then cut off the current output of the USB interface; if not, then the USB interface outputs the charging current;

After the current output of the USB interface is cut off, after a rated time, it is judged again whether the temperature detected by the temperature detection module exceeds a threshold value, and the above steps are repeated until the USB interface outputs a charging current.

In one of the embodiments, it also includes setting a standard USB line identification module in the adapter connected to the USB interface, and if the USB line identified by the identification module is a standard USB line, the output large current is charged externally; If the USB cable identified by the identification module is not a standard USB cable, a small current is output for external charging, wherein the standard USB cable adopts a communication protocol corresponding to the adapter.

In one of the embodiments, it also includes encrypting the adapter and the USB interface.

In one of the embodiments, encryption is performed between the D+D- two communication lines of the UBS interface and the adapter.

In one of the embodiments, a PIN pin is added to the USB interface for encrypted communication.

In addition, an easy-to-operate USB interface high-current charging protection system is also provided.

A USB interface high-current charging protection system, including a temperature detection module, a control module and a current switch module;

The temperature detection module is arranged at both ends of the USB interface, and is used to detect the temperature at both ends of the USB interface; the control module is used to receive the temperature detected by the temperature detection module, and judge the temperature detected by the temperature detection module Whether it exceeds the threshold, if so, the control module is used to control the current switch module to cut off the current output of the USB interface; if not, the control module is used to control the current switch module to turn on, so that the USB interface output charging current;

After the current output of the USB interface is cut off, after a rated time, the control module is used to judge again whether the temperature detected by the temperature detection module exceeds a threshold value, and repeatedly judge to output the charging current to the USB interface.

In one of the embodiments, it also includes a standard USB line identification module set in the adapter connected to the USB interface; if the USB line identified by the identification module is a standard USB line, then the output large current is charged externally; if If the USB cable identified by the identification module is not a standard USB cable, it outputs a small current for external charging, wherein the standard USB cable adopts a communication protocol corresponding to the adapter.

In one of the embodiments, encryption is performed between the adapter and the USB interface.

In one of the embodiments, encryption is performed between the D+D- two communication lines of the UBS interface and the adapter.

In one of the embodiments, a PIN pin is added to the USB interface for encrypted communication.

The above USB interface high-current charging protection method and system are provided with temperature detection modules at both ends of the USB interface to detect the temperature at both ends of the USB interface, and if the temperature does not exceed the threshold, the charging current is output. If the threshold is exceeded, the current output of the USB interface is cut off. Therefore, it is possible to prevent the USB interface from being burned due to excessive temperature caused by excessive current, thereby realizing the protection effect of high-current charging of the USB interface.

Description of drawings

Fig. 1 is the flowchart of USB interface high-current charging protection method;

Figure 2 is a block diagram of the USB interface high-current charging protection system.

Detailed ways

As shown in FIG. 1 , it is a flow chart of a USB interface high-current charging protection method.

The charging path of the USB interface is from the adapter—USB port—USB cable—USB B/C port—charging terminal. Generally, the two interfaces of USB A port and USB B/C port will burn out due to overheating. Because these two interface sockets are on the USB line, the USB line is provided with a temperature detection module for detecting the port temperature, a control module for controlling the on and off of the current switch module according to the port temperature, and a control module for controlling the temperature of the port. A current switch module for USB interface discharge and stop discharge.

Specifically, a USB interface high-current charging protection method includes the following steps:

Step S110, detecting the temperature at both ends of the USB interface, and judging whether the detected temperature exceeds a threshold.

Specifically, a temperature detection module is used to detect the temperature at both ends of the USB interface. The temperature detection module is an NTC (Negative Temperature Coefficient, negative temperature coefficient) resistor, and the NTC resistor is used to detect temperature. If the port heats up seriously, the current switch module is turned off to cut off the current output. After a period of time, check the port temperature. This cycle is repeated to ensure that the port temperature is lower than the temperature threshold and the port will not be burned. If necessary, you can also only put NTC resistors on the USBB/C port or USB A port to detect the temperature at one end only.

Step S120: If yes, cut off the current output of the USB interface; if not, then output the charging current from the USB interface.

Step S130, after cutting off the current output of the USB interface, after a rated time, judge again whether the temperature detected by the temperature detection module exceeds a threshold, and repeat the above steps until the USB interface outputs charging current.

The USB interface high-current charging protection method also includes setting a standard USB line identification module in the adapter connected to the USB interface, and if the USB line identified by the identification module is a standard USB line, then the output large current is externally charged; If the USB cable identified by the identification module is not a standard USB cable, a small current is output for external charging, wherein the standard USB cable adopts a communication protocol corresponding to the adapter.

Although protection has been done on the USB cable, the adapter actually provides the heating power. Therefore, the USB cable connected to the high-current adapter for high-current charging will cause burnout problems. Therefore, a standard USB cable identification module is introduced into the adapter, and when the adapter recognizes a standard USB cable, it can output a large current. When the adapter does not recognize the standard USB cable, the adapter is limited to output only a small current (for example, 1A). This can ensure that even if the adapter is used with an ordinary USB cable, it will not cause serious burn problems after current limiting treatment.

The USB interface high-current charging protection method further includes encrypting the adapter and the USB interface.

The USB interface high-current charging protection method encrypts the D+D- two communication lines of the UBS interface and the adapter. There is no need to change the USB interface.

In the USB interface high-current charging protection method, a PIN pin is added to the USB interface for encrypted communication. So as not to affect the normal USB communication.

Or use optical communication encryption. Guide the optical signal (such as infrared) emitted by the adapter/USB cable to the USB cable/adapter, and complete encrypted identification through optical communication. Therefore, normal USB communication is not affected, and the USB interface does not need to be changed.

Or use wireless communication encryption such as bluetooth. Therefore, normal USB communication is not affected, and the USB interface does not need to be changed.

Based on all the above-mentioned embodiments, by implementing the temperature protection function on the USB line and the encryption identification function on the USB line on the adapter, interface protection for high-current charging is realized. The adapter recognizes whether it is a standard USB cable, and limits the output current when it is used with a non-standard USB cable. Cooperate with standard USB cable to output high current, and add circuit protection port in the line.

As shown in Figure 2, it is a block diagram of the USB interface high-current charging protection system.

Based on all the above-mentioned embodiments, a USB interface high-current charging protection system includes a temperature detection module 101 , a control module 102 and a current switch module 103 .

The temperature detection module 101 is arranged at both ends of the USB interface, and is used to detect the temperature at both ends of the USB interface; the control module 102 is used to receive the temperature detected by the temperature detection module 101, and judge the temperature of the temperature detection module 101. 101 Whether the detected temperature exceeds the threshold value, if so, the control module 102 is used to control the current switch module 103 to cut off the current output of the USB interface; if not, the control module 102 is used to control the current switch The module 103 is turned on, so that the USB interface outputs charging current.

After the current output of the USB interface is cut off, after a rated time, the control module 102 is used to judge again whether the temperature detected by the temperature detection module 101 exceeds a threshold, and repeatedly judge to output the charging current to the USB interface.

The USB interface high-current charging protection system also includes a standard USB line identification module set in the adapter connected to the USB interface; if the USB line identified by the identification module is a standard USB line, then the output large current is externally charged; if If the USB cable identified by the identification module is not a standard USB cable, it outputs a small current for external charging, wherein the standard USB cable adopts a communication protocol corresponding to the adapter.

Encryption is performed between the adapter and the USB interface of the USB interface high-current charging protection system.

The USB interface high-current charging protection system encrypts the D+D- two communication lines of the UBS interface and the adapter.

The USB interface high-current charging protection system adds a PIN pin to the USB interface for encrypted communication.

The above USB interface high-current charging protection method and system set temperature detection modules 101 at both ends of the USB interface to detect the temperature at both ends of the USB interface. If the temperature does not exceed the threshold, the charging current is output. If the threshold is exceeded, the current output of the USB interface is cut off. Therefore, it is possible to prevent the USB interface from being burned due to excessive temperature caused by excessive current, thereby realizing the protection effect of high-current charging of the USB interface.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (8)

1. a kind of USB interface large current charge guard method, suitable for USB line and adapter, includes the following steps：

The temperature of two end interface of USB line is detected, and judges the temperature of detection whether more than threshold value；

If so, cut off the electric current output of the USB line；If it is not, then the USB line exports charging current；

After the electric current output of the USB line is cut off, by time rating, judging the temperature of temperature detecting module detection again is No is more than threshold value, repeats the above steps and exports charging current to the USB line；

Identification module for identifying standard configuration USB line is set in the adapter being connect with USB interface, if the identification module is known The USB line being clipped to is standard configuration USB line, then exports high current and externally charge；If the USB line that identification module recognizes is not standard configuration USB line then exports low current and externally charges.

2. USB interface large current charge guard method according to claim 1, which is characterized in that further including will be described suitable Orchestration is encrypted with USB interface.

3. USB interface large current charge guard method according to claim 2, which is characterized in that by the D+ of USB interfaces D- two is encrypted between communication line and adapter.

4. USB interface large current charge guard method according to claim 2, which is characterized in that increase in USB interface PIN foot is used for coded communication.

5. a kind of USB interface large current charge protects system, including USB line and adapter, which is characterized in that the USB line packet Include temperature detecting module, control module and current switch module；

The temperature detecting module is arranged on two end interface of USB line, and the temperature for detecting two end interface of USB line；Institute Control module is stated for receiving the temperature of the temperature detecting module detection, and judges the temperature of the temperature detecting module detection Whether it is more than threshold value, if so, the electric current that the control module is used to that the current switch module to be controlled to cut off the USB line is defeated Go out；If it is not, then the control module makes the USB line output charging current for the current switch module to be controlled to be connected；

After the electric current output of the USB line is cut off, by time rating, the control module is used to judge the temperature again Whether the temperature of detection module detection is more than threshold value, repeats to judge to export charging current to the USB line；

Identification module for identifying standard configuration USB line is set in the adapter being connect with USB interface；If the identification module is known The USB line being clipped to is standard configuration USB line, then exports high current and externally charge；If the USB line that the identification module recognizes not is mark With USB line, then export low current and externally charge.

6. USB interface large current charge according to claim 5 protects system, which is characterized in that the adapter and USB It is encrypted between interface.

7. USB interface large current charge according to claim 5 protects system, which is characterized in that by the D+ of USB interfaces D- two is encrypted between communication line and adapter.

8. USB interface large current charge according to claim 5 protects system, which is characterized in that increases in USB interface PIN foot is used for coded communication.