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A wireless data communication terminal and its battery overtemperature detection and protection device

An over-temperature detection and protection device technology, applied in battery overheat protection, battery circuit device, emergency protection circuit device, etc., can solve problems such as the increase of main CPU processing software business, increase in software function cost, system crash, etc., and achieve enhanced reliability. security, enhanced real-time performance and effectiveness, and reasonable hardware and software costs

Active Publication Date: 2019-04-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the main CPU must have ADC function, otherwise it is necessary to add an ADC chip to increase the cost, and at the same time increase the cost of software functions
In addition, when the functions of the wireless data terminal become more complex, the main CPU handles more software services, especially in the data terminal with an operating system, it is easy to cause system crashes, program runaways and other host abnormalities
According to the user's usage scenario, when the host system is abnormal, the charging and discharging of the battery may still work normally. At this time, if the battery is overheated, the host CPU cannot control the charging function to shut down.

Method used

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  • A wireless data communication terminal and its battery overtemperature detection and protection device
  • A wireless data communication terminal and its battery overtemperature detection and protection device
  • A wireless data communication terminal and its battery overtemperature detection and protection device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051] In this specific example, if Figure 5 As shown, the voltage comparator of the battery 45°C temperature detector is composed of 301 op-amp proportional operational amplifier U1 and peripheral resistors R1, R2, R3, R5, R4 and RNTC (battery internal NTC resistance), and its operational output is Vo1, Connected to the charging management unit circuit 302, used to control the charging enable switch (enabling charging or prohibiting charging). R1, R2, R3, R4, and RNTC are resistor networks, and Rf1 is the feedback resistor of the operational amplifier, which introduces deep negative feedback for the operational amplifier U1; resistors R1 and R1 form a voltage divider, connected to the input positive terminal of 301, and VCC power supply Divide the voltage to provide a suitable reference voltage for the operational amplifier U1, R2 and the thermistor RNTC with a negative temperature coefficient inside the battery form a temperature detector, which is connected to the input ne...

specific example 1

[0052] In the specific example 1, the 302 proportional operational amplifier U2 and R5, R6, R7 form a battery temperature detector at 60°C, and its output Vo2 is connected to the main CPU of the system, and the power management module PMU of the system, because the control of the PMU and CPU detects the battery temperature , that is, when the battery temperature reaches 60°C, the Vo2 output signal causes the PMU module to start the system shutdown process, or directly shuts off the main power supply of the system to stop the system from working. At the same time, if the system needs to be turned on next time, it needs to start the CPU to detect the battery temperature, that is, the CPU needs to detect the state of Vo2 at this time to judge whether the battery temperature has dropped below 60°C. Only when the temperature drops below 60°C is it allowed to start. process.

[0053] Among them, resistors R5 and R6 form a voltage divider, which is connected to the input negative ter...

example 2

[0055] The 60°C temperature detector described in the summary of the invention and the charging integrated IC (these integrated ICs mainly include MAX8903, QB2416X series, NCP185X system, but not limited to this) constitute a charging management unit, and the battery temperature detection and over-temperature protection are realized. Stop charging the battery at 45°C, and shut down the system at 60°C. In this example, if Figure 6 As shown, 401 is the charging management main chip, 402 is the main CPU small system in the wireless data communication terminal system (hereinafter referred to as the system) of the present invention, hereinafter referred to as the host Host, 403 is the connection between the host Host and the charging management main chip The communication interface (such as IIC bus, or GPIO interface, etc.), 404 is the battery temperature detection device, which uses an external resistor to connect with the ID pin of the lithium battery, which is equivalent to con...

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Abstract

The invention provides a wireless data communication terminal and a battery overtemperature detection and protection device thereof. The device includes a power management module, a charging management module and a temperature detection and comparison module. The temperature detection and comparison module is used to detect the temperature of the battery and compare the battery temperature and The first temperature threshold and output to the power management module a first indication signal indicating whether it is overheated according to the comparison result, and compare the battery temperature with the second temperature threshold and output a second indication signal indicating whether it is overheated to the charging management module according to the comparison result , when the first indication signal indicates overtemperature, the power management module executes a shutdown operation, and when the second indication signal indicates overtemperature, the charge management module stops charging the battery. The device of the present invention improves the real-time performance of battery over-temperature detection and control, enhances the reliability of battery over-temperature detection and protection functions and the security of wireless data communication terminals through a pure hardware circuit or a hardware-based software-assisted method.

Description

technical field [0001] The present invention relates to the field of wireless data communication equipment, and more specifically relates to a wireless data communication terminal and an overtemperature detection and protection device for a power supply battery thereof. Background technique [0002] As the functions of wireless data terminal products become more and more powerful, the power consumption of the products also increases, and the capacity of the power supply battery becomes larger, and the requirements for charging and discharging current also increase accordingly. The heating problem of the system power supply battery during charging and discharging will not only directly affect the user experience of wireless data terminals, but also affect the reliability of the product and the personal safety of users during use. The existing technologies for solving this problem and some common practices in the industry are introduced as follows: [0003] 1. Using the integ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/18
CPCH02H7/18H02H5/04H02J7/00309H02J7/00
Inventor 胡东平
Owner ZTE CORP
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