Electronic three-section type over-current and over-temperature protection device

Abstract

The invention relates to an electronic three-section type over-current and over-temperature protection device for performing secondary protection on batteries in different voltage levels. The currentof a battery in a charging and discharging process is detected all the time; according to the current magnitude, the current is divided into three sections and three kinds of delay times; the protection state of the battery is controlled through comparative amplification on a feedback signal; the temperature of the battery is synchronously monitored; the battery is prevented from being damaged byover-current, short-circuiting and over-temperature in the charging and discharging process; battery scrapping and explosion due to over-current, short-circuiting and over-temperature of the battery can be avoided; therefore, after the battery is protected, the normal functions of the battery are recovered through recharging; and simultaneously, the use security of the battery is ensured.

Description

technical field [0001] The invention relates to a safety device for secondary protection of batteries with different voltage levels, especially to avoid damages of overcurrent, short circuit and over temperature during the charging and discharging process of the battery, and to restore the normal function of the battery by recharging after the battery enters protection. Electronic three-stage over-current and over-temperature protection device. Background technique [0002] At present, there are four known secondary protection schemes for batteries of mobile phones, tablet computers, and notebook computers: PTC, FUSE (three-terminal fuse), BREAKER (circuit breaker), protection IC and MOSFET. PTC has a wide range of applications and low price, but its protection action time is slow, greatly affected by ambient temperature, unstable, and only has over-current protection function; FUSE (three-terminal fuse) is a one-time protection device, and its work requires external protect...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the slow action time of the secondary protection of the existing batteries with different voltage levels, the influence of the ambient temperature, the poor stability, the lack of over-current protection functions, the inconvenience of maintenance for battery protection, the difficulty of restoring the battery after protection, and the occurrence of shocks after vibration Due to the shortcomings of instantaneous interruption, large number of components and relatively large occupied space, the present invention provides an electronic three-stage over-current and over-temperature protection device. The electronic three-stage over-current and over-temperature protection device is not only suitable for mobile phones, Secondary protection of computer and laptop batteries, and after integration, it is small in size and completes over-current, short-circuit and over-temperature protection functions. After protection, the normal protection function of the battery can be restored by recharging

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