Safety power-on time sequence control circuit system

Abstract

The invention discloses a safety power-on time sequence control circuit system which comprises a time sequence control circuit, a power switching circuit and a current discharge circuit, wherein the time sequence control circuit is used for sending out a switching control signal according to various paths of voltage output by a power supply and a preset power-on sequence, controlling the power switching circuit to turn on a switching power supply and controlling the current discharge circuit to discharge backwards flown circuit to the ground; the power switching circuit is used for controlling various paths of power supplies to supply power according to the control signal sent by the time sequence control circuit; and the current discharge circuit is used for discharging backwards flown current in the system to the ground according to a current discharge control signal sent by the time sequence control circuit. In the power-on time sequence control circuit system, the time sequence control circuit is used for controlling the power supply of the power switching circuit and controlling the current discharge circuit to discharge current being probable of backwards flowing to the ground, thereby the control of a safety power-on time sequence is realized. The power-on time sequence control system disclosed in the embodiment has the characteristics of high stability, safety, simple circuit structure, low cost and very high practicality.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to a safe power-on sequence control circuit system realized by adopting triode and Mos tube. Background technique [0002] In most circuit systems, there are very strict indicators for power-on timing requirements. Because for different chips, their power supply systems have independent power-on sequence requirements. For example, if a chip has two power supplies of 1.2V and 3.3V, usually the chip will require its 3.3V power supply to be powered on earlier than 1.2V. Due to these different power-on sequence requirements, a certain power-on sequence control circuit must be added. [0003] The usual power-on sequence control method is to control the output time point of each power supply voltage to meet the requirements for controlling the power-on sequence of different voltages. However, in complex system design, there will inevitably be conflicting requirements for the power-on seq...

AI Technical Summary

Problems solved by technology

However, the control accuracy of this method is not high, and the current backflow phenomenon caused by the conflicting timing of each channel cannot be prevented.

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