Circuit for controlling power-on state of rear-end micro-control chip based on MOS transistor

Abstract

The invention discloses a circuit for controlling a power-on state of a rear-end micro-control chip based on a MOS transistor. The circuit comprises an input voltage rectifying circuit, an output voltage control circuit, a control state detection circuit, a conduction switch control circuit and a control state retention circuit; the input end of the input voltage rectifying circuit is connected with an external voltage; and the output end of the input voltage rectifying circuit is connected with the input end of the output voltage control circuit. According to the circuit for controlling the power-on state of the rear-end micro-control chip based on the MOS transistor, the rear-end power-on operation is completed; after a rear-end micro-controller is powered on, the control state retentioncircuit can be quickly started; the conduction switch control circuit completes operation to release conduction contact of the switch; and the rear-end micro-control chip completes a micro-control chip power-on starting process through detection of the control state detection circuit. The rear-end micro-control chip is quickly started and powered on through a conduction signal of a conduction switch.

Description

technical field [0001] The invention relates to the field of power-on control circuits, in particular to a MOS transistor-based circuit for controlling power-on of a back-end micro-control chip. Background technique [0002] In industrial production, devices or control circuits are provided with chips, and a power-on circuit for the chips is required to provide a necessary power supply voltage. [0003] The traditional upper power control circuit such as figure 2 As shown, the external power supply voltage directly connects the power supply to the input voltage, and there will be an overshoot voltage at the moment of power-on or power-on. [0004] The overshoot voltage has a direct impact on the back-end chip, and after the power is cut off, the output terminal still has output, and the chip hung behind the voltage regulator circuit chip has to withstand a high-voltage impact that is more than twice the limit voltage within a few milliseconds. adverse effects on chip equip...

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