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 the problems of overvoltage protection of terminal equipment that have not been well solved

Inactive Publication Date: 2009-09-02
ZTE CORP
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, neither of the above two solutions can well solve the problem of overvoltage protection of terminal equipment under charging conditions.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Terminal equipment charging overvoltage protective device and method
  • Terminal equipment charging overvoltage protective device and method
  • Terminal equipment charging overvoltage protective device and method

Examples

Experimental program
Comparison scheme
Effect test

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 status of the charger plugged in or pulled out. 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 a charger is detected, the control figure 1 The charging transistor Q is 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 input terminal and t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a charging overvoltage protection device for terminal equipment and a method thereof, which comprises: a first switch circuit, which is connected in series to the charging voltage input terminal and the battery management chip's detection input terminal for detecting charger plugging and unplugging states Between; the second switch circuit, the switch circuit is connected in series between the control terminal of the charging switch circuit and the charging control output terminal of the battery management chip; the charging input voltage detection circuit is used to detect the voltage of the charging voltage input terminal, and The detected state signal is sent to the delay control circuit; and the delay control circuit is used to generate a control signal according to the detection result of the charging input voltage detection circuit, and send the control signal to the first switch circuit and the second switch control side of the circuit. The invention can not only protect the terminal from being damaged during overvoltage charging, but also has the function of self-recovery, and the circuit cost is very low, and at the same time, it does not affect the maintainability 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20H02H3/06H02H7/18
Inventor 李启瑞赵恺徐鹏斌李超马驰
Owner ZTE CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap