A shutdown control circuit and electronic product

Abstract

The invention discloses a power-off control circuit and an electronic product. The power-off control circuit comprises a master chip, a power conversion circuit and a reset chip, wherein the power conversion circuit powers the master chip. The reset chip is connected with a system power source. When voltage of the system power source is lower than power-off voltage, a reset signal is output to the enable end of the power conversion circuit; the power conversion circuit is controlled to stop operating, power supply to the master chip is cut off, and a system is powered off. The power-off control circuit is simple in structural design, easy to implement and low in cost; the capacity of the system resisting to ripple interference and the function of the system powering off accurately in the standby state can be significantly improved, and the design requirement for the system being not powered off in the charging state can be met. After the power-off control circuit is applied to battery-powered portable electronic products, operational stability and reliability of products can be improved, and the performances of products are improved.

Description

technical field [0001] The invention belongs to the technical field of power-off control circuits, and in particular relates to a circuit structure design for controlling system shutdown accurately and an electronic product adopting the power-off control circuit design. Background technique [0002] For portable electronic products, most of them use a built-in battery to power the system circuit, such as mobile phones, cameras, earphones, tablet computers, etc., for the convenience of users to carry out. Due to the use of electronic products, their battery power will continue to drop. When the voltage of the system power supply is in the critical state of switching on and off, if the system is disturbed by the ripple interference generated by the interference power supply at this time, causing the detected system power supply voltage to be lower than the shutdown voltage, the system will immediately execute the shutdown operation, resulting in a system accident. Shutdown pr...

AI Technical Summary

Problems solved by technology

Due to the use of electronic products, the battery power will continue to drop

When the voltage of the system power supply is in the critical state of switching on and off, if the system is disturbed by the ripple interference generated by the interference power supply at this time, causing the detected system power supply voltage to be lower than the shutdown voltage, the system will immediately execute the shutdown operation, resulting in a system accident. shutdown problem

[0003] In addition, when the system enters the standby mode, in order to reduce the standby power consumption, the main processor in the system no longer detects the voltage of the system power supply.

At this time, due to the existence of a certain leakage current in the entire system, the battery will continue to consume power, and the voltage of the system power supply will continue to drop until the battery is over-discharged, enters the protection state, and stops the output voltage, the system will disappear due to the power supply. and power off

Due to excessive discharge of the battery, it will not only shorten the service life of the battery, but also reduce the effective charging capacity of the battery, which will have a great impact on the standby life and service life of electronic products

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