A kind of software and hardware control high reliable switching machine circuit

Abstract

The invention relates to a highly reliable switch machine circuit controlled by software and hardware, including a contactor J1, a relay J2, a switch AAP, a software hold switch K1, a field effect transistor V1, an optocoupler P1, an optocoupler P2, a resistor R1, a resistor R2, a resistor R3, resistor R4, diode D1, one end of the switch AAP is grounded, the other end is connected to the relay J2 through the diode D1, one end of the relay J2 is connected to the drain of the field effect transistor V1 through the contactor J1, and the other end is connected to the field effect transistor V1 through the resistor R1. The gate of the transistor V1, one end of the resistor R2 is connected to the gate of the field effect transistor V1, the other end is grounded to the source of the field effect transistor V1, one end of the photocoupler P2 is connected to the switch AAP, and the other end is connected to the relay J2 through the resistor R3, The software hold switch K1 is connected to the photocoupler P1 through the resistor R8, and the photocoupler P1 is connected to the relay J2. In order to ensure the reliable power supply of the equipment, the software interlock signal is sent out through the microcontroller, and the software and hardware double ensure the reliable pull-in of the contactor contacts.

Description

technical field

[0001] The invention relates to the technical field of power electronics, in particular to a highly reliable switch machine circuit controlled by software and hardware. Background technique

[0002] With the continuous development of computer technology, most electrical equipment is controlled by microprocessors, and there are generally two ways to control the power supply of electrical equipment. One uses alternating current or direct current to directly apply to the switch, and the equipment is powered by turning on and off the switch, and the main circuit current flows through the switch, which requires a high current and voltage resistance of the switch. A contact that uses alternating current or direct current to add to the relay or contactor. The power switch is connected to the wire package of the relay or contactor, and the contact of the relay or contactor is closed and disconnected by turning on and off the power switch. , to power up the equipment...

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