Method for effectively detecting overheating burn-in of USB C port of mobile phone
A technology for detecting overheating of mobile phones, applied in emergency protection detection, parts of emergency protection devices, emergency protection devices that automatically disconnect, etc. , to achieve good protection, prevent USB burning phenomenon, or reduce the effect of USB burning phenomenon
Inactive Publication Date: 2019-12-20
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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Problems solved by technology
[0003] The purpose of the present invention is to provide a method for effectively detecting the overheating of the USB C port of the mobile phone, mainly to solve the problem that the thermistor on the motherboard existing in the prior art cannot timely and accurately know the temperature change of the USB port, thereby causing the USB port to overheat The problem
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[0019] Such as figure 1 As shown, a method for effectively detecting the overheating of the USB C port of the mobile phone specifically includes the following steps:
[0020] (S1) In principle, one end of the thermistor is connected to the Vbus network of the USB port, and the other end is connected to the detection pin of the temperature detection chip; or connected to the temperature detection chip through a voltage dividing resistor, the actual placement of the thermistor on the motherboard needs Try to be as close to the USB port as possible. If the Vbus pins of the USB port are distributed on both sides of the USB interface, you need to connect the Vbus together through the nearest wiring, then place the thermistor at the position closest to the Vbus network, or place the thermistor The resistor is placed under the USB port; and the temperature detection chip includes but is not limited to: (a) an independent temperature detection chip, (b) a charging chip integrating the...
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The invention discloses a method for effectively detecting overheating burn-in of a USB (Universal Serial Bus) C port of a mobile phone, and mainly solves the problem of USB port overburning caused bythe fact that a thermistor on a mainboard cannot accurately know the temperature change of the USB port in time in the prior art. The method comprises the steps that a temperature detection chip is arranged on a mainboard, and meanwhile a thermistor connected with a Vbus network is arranged at the position close to an interface; when the temperature detection chip detects that a Vbus is inserted,the temperature detection chip detects the temperature and / or the temperature change slope of the thermistor located at the mainboard interface; the USB port generates heat, the heat is conducted tothe Vbus network of the mainboard through the metal pin of the Vbus, and the resistance value of the thermistor in contact with the Vbus network changes; and when the temperature detection chip detects that the temperature and / or the temperature change slope of the thermistor exceeds a threshold value, namely the USB port is overheated, a protection action is performed. According to the scheme, the USB interface temperature can be quickly and accurately judged, so that the purpose of effectively preventing overburning is achieved, and the USB interface temperature control method has very highpractical value and promotional value.
Description
technical field [0001] The invention belongs to the technical field of mobile phone motherboard detection, and in particular relates to a method for effectively detecting the overheated burnt port of a USB C port of a mobile phone. Background technique [0002] The existing USB port overheating protection is to place a thermistor near the USB port, one end of the resistance is connected to the GND of the motherboard, and the other end is connected to the SOC or the ADC of the Charger. When the interface is overheated, the heat conduction of the motherboard and the GND metal will drive the thermistor to heat up, thereby changing the resistance of the thermistor, and the SOC or charger will get the temperature change information of the USB port according to the change of the resistance of the thermistor, so as to make Judgment and protection. However, due to the large area of copper on the GND on the motherboard, the heat conduction is very slow, and the correlation with th...
Claims
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Login to View More IPC IPC(8): H04M1/24H02H1/00H02H5/04
CPCH02H1/0007H02H5/04H02H5/042H04M1/24
Inventor 刘崇
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD