Terminal equipment charging overvoltage protective device and method

A technology of terminal equipment and charging overvoltage, which is applied in the direction of emergency protection circuit device, protection that responds to overvoltage, emergency protection device that automatically disconnects, etc., can solve problems such as overvoltage protection of terminal equipment that cannot be well solved

Inactive Publication Date: 2008-02-06
ZTE CORP
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Problems solved by technology

[0005] To sum up, neither of the above two solutions can well solve the pr...

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  • Terminal equipment charging overvoltage protective device and method
  • Terminal equipment charging overvoltage protective device and method

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Embodiment Construction

[0026] Various preferred embodiments of the present invention will be described in detail below.

[0027] The terminal equipment charging overvoltage protection device of the present invention is used in a terminal equipment charging system, and the system includes a battery management chip PM that manages the entire terminal power supply (PM can use the PM6650 of Qualcomm of the United States, which has two pins VCHG and CHG_CTR: The function of VCHG is to detect the plug-in or pull-out status of the charger. When the voltage of the VCHG pin is greater than a certain rated value, such as 3V, it is judged that the charger is plugged in, otherwise it is judged that the charger is pulled out; the function of CHG_CTR is, when When it is detected that a charger is plugged in, the charging transistor Q in FIG. 1 is controlled to be turned on to complete the charging of the battery by the charger.), and the charging switch circuit 105 connected in series between the charging voltage ...

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Abstract

The present invention discloses an overcharge protection device and method for a terminal equipment, which comprises: a switch circuit 1 that is concatenated between the input end of the charging voltage and the input end of the battery management chip for detecting the plug in and out status of the charger; a switch circuit 2 that is concatenated between the control end of the charging switch circuit and the output end of the charging control of the battery management chip; a charging input voltage detecting circuit for detecting the voltage volume of the input end of the charging voltage, and sending the status signal to the time delay control circuit; and a time delay control circuit for generating control signal according to the detected result of the input charging voltage detecting circuit, and sending the control signal to the control end of the switch circuits 1,2. The present invention can not only prevent the terminal from being damaged while an overcharge occurs, but also has a self recovery function at low circuit costs, at the same time without influencing the maintenance and function realization of the system.

Description

technical field [0001] The invention relates to an overvoltage protection method, in particular to a terminal device charging overvoltage protection device and method thereof. Background technique [0002] China's Ministry of Information Industry (MII) issued the "Mobile Communication Handset Charger and Interface Technical Requirements and Test Methods" (YD / T1591-2006) in November 2006, which stipulates that the handset must have a charging overvoltage protection function inside. At present, the common practice in the charging overvoltage protection scheme in the industry is as follows: [0003] A. Use a fuse to realize charging overvoltage and overcurrent protection functions. The circuit of this method is relatively simple, but has the disadvantage of non-recoverability. When the output voltage of the charger is higher than the protection threshold, the fuse is blown, which plays a protective role and prevents the terminal equipment from being damaged by overvoltage. A...

Claims

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Application Information

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IPC IPC(8): H02H3/20H02H3/06H02H7/18
Inventor 李启瑞赵恺徐鹏斌李超马驰
Owner ZTE CORP
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