Embedded system power switch control circuit

Abstract

The invention discloses an embedded system power switch control circuit which is formed by connecting a power input end (a), a counter-attack schottky diode (b), a power switch power tube (c), a power holding control transistor (d), a power switch (f), a trigger and shutdown signal detection double-diode set (e), a direct current voltage stabilizing circuit (g) and other resistance-capacitance devices. The power input end (a) is connected with the counter-attack schottky diode (b) to form a reverse connection prevention input circuit; the power switch (f) is connected with the trigger and shutdown signal detection double-diode set (e) to form a startup and shutdown triggering circuit; and the power holding control transistor (d) is connected with the power switch power tube (c) to form a power supply holding circuit. The embedded system power switch control circuit disclosed by the invention is an embedded system power supply circuit which is low in cost, high in energy saving, convenient and practical, and has very high economy, practicality and reliability.

Description

technical field [0001] The invention relates to a power switch control circuit for an embedded system, more specifically, to a cold-on and hot-off power switch circuit based on the coordinated work of an embedded processor and a hardware control circuit. Background technique [0002] The embedded system power supply circuit is an important guarantee for the stable and reliable operation of the embedded system, especially the battery-powered embedded system has been widely used, how the power supply circuit can supply power to the system and cut off the power supply of the system under the control of a single button has become an urgent problem. problem. Many embedded systems use the whole circuit to be in a charged state all the time. After pressing the switch, the program controls the CPU to be in a sleep state, and then press the button to wake up the CPU to make it work normally. Although the current consumed by the CPU in sleep mode is very small, the external circuit s...

AI Technical Summary

Problems solved by technology

Although the current consumed by the CPU in sleep mode is very small, the external circuit still consumes a certain amount of power. The system will quickly run out of battery power when the system is in standby for a long time, causing unnecessary waste, which is neither energy-saving nor environmentally friendly.

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