Power-down time sequence control device and method for multiple power supplies

Abstract

The invention discloses a power-down time sequence control method and a power-down time sequence control device for a plurality of power supplies, which are used for realizing power-off time sequences of the plurality of the power supplies before a system loses power when a power-down situation happens. The device comprises a power-down detection circuit, a first-power-off power supply monitoringcircuit, a power switch circuit, a power switch and a discharge circuit, wherein the power-down detection circuit is used for detecting a power-down situation, and sending a power-down signal when the power is down; the first-power-off power supply monitoring circuit is used for monitoring a first-power-off situation of a first-power-off power supply, and sending a power-off completion signal of the first-power-off power supply when the power-off of the first-power-off is completed; the power switch circuit is used for realizing the control of the power switch according to an output signal ofthe power-down detection circuit and the output signal of the first-power-off power supply monitoring circuit; the power switch is used for controlling the power-on and the power-off of the power supply; and the discharge circuit is used for realizing the rapid power-off of the power supply when the power supply is powered off.

Description

technical field [0001] The invention relates to the field of multi-channel power supply control, in particular to a multi-channel power supply power-down sequence control device and method. Background technique [0002] With the rapid development of electronic products, the power source of electronic products - the power supply system is becoming more and more complex. In many fields such as communication and electronic systems, industrial control, medical treatment, household appliances, etc., with the wide application of embedded integrated circuits, the power supply structure has become more and more complex. Especially in the field of sequence control of multiple power supplies, each input power supply is required to have a strict power-off sequence. If the power-off sequence is improper, it will not only affect the reliability of the system, but even cause permanent damage to the system components. [0003] In the case of normal power supply, the power-off timing probl...

AI Technical Summary

Problems solved by technology

However, there are the following problems in the prior art: 1. For the situation where the power-on / off is controlled by the MCU, after the power-down detection signal is sent out, the MCU needs to control the power-off of each power supply first, and the timing is delayed, and poor reliability;

[0008] 2. For the case of completely relying on the logic control unit to control power on / off, the flexibility is poor, and it is not conducive to the interaction between the control system and the main control interface (PC)

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