Startup-shutdown circuit with software lock control

Abstract

The invention discloses a startup-shutdown circuit with software lock control, which belongs to the technical field of the low-voltage switch control circuit. The startup-shutdown circuit comprises an input voltage port connected with a negative electrode of a TVS tube T1 and a positive electrode of a capacitor C1; a positive electrode of the TVS tube T1 is connected in series with a ground wire; a negative electrode of the capacitor C1 is connected in series with the ground wire; and the positive electrode of the capacitor C1 is connected in parallel with an input terminal of a resistor R2, an input terminal of a resistor R1, and a positive electrode of a capacitor C4. According to the circuit provided by the invention, after proper adjustment, the circuit can be used as an internal switch of a precise key control circuit; according to different MOS tube Q1 model selection, the heavy current switch can be controlled by weak voltage and current signals, so that the key control function and the startup-shutdown control function can be combined into one, so that the single key has the dual functions. Moreover, on the basis of the software and hardware dual-protection turn-off part in the circuit, high-voltage and high-current overshooting can be prevented, so that the circuit is protected; and the whole circuit structure is designed simple and reliability of the mechanical control switch is improved.

Description

technical field [0001] The invention relates to the technical field of low-voltage switch control circuits, in particular to a switch circuit with software lock control. Background technique [0002] At present, low-voltage switch control circuits are used in semiconductor laser technology and other weak current control fields. Its start-up method depends on the forced shutdown composed of mechanical button control opening and emergency stop switch. The digital circuit software latches and controls the latch of the host's startup and shutdown status. Considering the energy consumption of the switch in the main control part, MOS tubes are used for switching. The control of the switch is mainly used in the state latch of the switch and prevents the false triggering of the switch state to improve the reliability of the system performance. However, the mechanical control switch in the existing circuit cannot latch the switch logic state. Therefore, I propose a A switch circuit ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a switch circuit with software lock control to solve the problem that the mechanical control switch in the existing circuit proposed in the background technology cannot latch the logic state of the switch

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