Reset circuit for multi-power-supply system

Abstract

The invention discloses a reset circuit for a multi-power-supply system, which comprises a logic circuit and a signal follower circuit connected with the logic circuit, wherein the multiple system power supplies of the multi-power-supply system are connected in parallel to the logic circuit. When voltage value output by any one of the multiple system power supplies is lower than a preset reset threshold voltage, the logic circuit generates an initial reset voltage signal and outputs the initial reset voltage signal to the signal follower circuit. The signal follower circuit performs voltage follower processing to the initial reset voltage signal so as to generate and output a reset signal. The reset circuit for the multi-power-supply system uses at least two system power supplies already existing in the multi-power-supply system for a reset work signal of the reset circuit, is capable of meeting the requirement for timing sequence of the reset signal in the multi-power-supply system, removes an existing timing sequence control circuit used for controlling the system power supplies, simplifies design of the reset circuit of the whole system, and meanwhile improves reliability of reset timing sequence of the reset signal provided by the system.

Description

technical field [0001] The invention relates to the field of reset circuits, in particular to a reset circuit used in a multi-power supply system. Background technique [0002] For the reset circuit of a multi-power system, in the application process, the reset circuit is required to always meet the requirements of first up first down, that is, the reset circuit must be in the reset state when all power supplies are powered on, and the reset can only be removed after all power supplies are powered on At the same time, when all power supplies are powered off, the reset circuit is required to be in the reset state first, and then multiple power supplies in the system are powered off. [0003] Based on this, in order to ensure the normal operation of the multi-power system, it is necessary to select a power supply with a sequence of up and down first as the working power supply of the reset circuit, but for this power supply, a series of complicated peripherals need to be added...

AI Technical Summary

Problems solved by technology

The power on and off sequence of each power supply is controlled by the power supply sequence control circuit, so as to ensure that the reset signal generated by the reset circuit meets the requirement of first up first down, but the added power supply sequence control circuit is relatively complicated and increases the design. the cost of

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