A dual power supply and power-off sequence control device and method

Abstract

The invention relates to a double-power-supply power supply and power-off sequential control device and method. The device includes a PMOS field effect transistor, an NMOS field effect transistor, a first NPN triode, a second NPN triode, a PNP triode, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, all the hardware elements have specific connection relations, and positive and negative power supply turning-on and turning-off timing sequences are logically controlled through the hardware elements of the PMOS field effect transistor and the NMOS field effect transistor. The device avoids power supply and power-off timing errors of the positive and negative power supplies, thereby ensuring normal operation of equipment.

Description

technical field [0001] The present invention relates to the technical fields of automatic monitoring of water conservancy and hydrology, urban and rural flood control, public facility safety, geological disasters, etc., especially the normal operation of field data acquisition terminal equipment (hereinafter referred to as acquisition terminal or acquisition terminal equipment) that is applied in the above fields and has no reliable power supply guarantee. Negative dual power supply and power-off sequence control device and method. Background technique [0002] Under normal circumstances, the turn-on and turn-off sequence of the positive power supply and the negative power supply is: when the power is turned on, the positive power supply is first controlled to be turned on, and then the negative power supply is controlled to be turned on after the positive power supply voltage is stable; Turn off the negative power supply, wait for the voltage of the negative power supply to...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the program controls dual power supply and cuts off in the prior art, and in the harsh electromagnetic environment in the field, the CMOS device may be locked or even damage the collection terminal equipment due to the program out of control, and provides a dual power supply and power-off sequence control The device controls the positive and negative power on and off timings through hardware circuits such as PMOS field effect transistors and NMOS field effect transistors. This device can avoid positive and negative power supply and power-off timing errors and ensure the normal operation of the equipment.

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