A single tube self-holding solid state relay

Abstract

The invention discloses a single-tube-type self-hold solid state relay. The single-tube-type self-hold solid state relay comprises a common solid state relay module and a self-hold module. The self-hold module is provided with four input ends, a thyristor D1, an excitation resistor R1, a reset resistor R2 and a PNP audion Q1. The four input ends are the polarization positive electrode end, the polarization negative electrode end, the excitation end and the reset end respectively. The single-tube-type self-hold solid state relay has the advantages that after the polarization ends of the relay are powered up, the self-hold module is in a cut-off state, after the excitation end is powered off, currents continuously pass through the input end of the solid state relay, the state of the output end of the solid state relay can be maintained, after the reset end of the module is powered up, no currents pass through the input end of the solid state relay, an initial state is reset at the output end, so that the continuity of the state of the solid state relay is achieved, and the phenomenon that the reliability of the entire device system is affected due to instantaneous power failure can be prevented.

Description

technical field [0001] The invention relates to a single-tube self-holding solid state relay, which belongs to the technical field of solid state relays. Background technique [0002] In the field of electromagnetic relays, self-holding relays rely on the magnetic steel inside the product to maintain the contact state after the relay is switched. Even if the coil is powered off, the contact state will not be affected. Conventional solid-state relays usually need to provide a certain maintenance current at the input end after power-on conversion; once the input end is cut off for a certain period of time, the output end will also be disconnected instantaneously, which seriously affects the reliability of the whole system . At present, in the field of solid state relay technology, there is a thyristor output optocoupler with similar functions, but it has the disadvantages of large conduction voltage drop, and the output terminal must be powered off to return to the initial st...

AI Technical Summary

Problems solved by technology

Conventional solid-state relays usually need to provide a certain maintenance current at the input end after power-on conversion; once the input end is cut off for a certain period of time, the output end will also be disconnected instantaneously, which seriously affects the reliability of the whole system

At present, in the field of solid state relay technology, there is a thyristor output optocoupler with similar functions, but it has the disadvantages of large conduction voltage drop, and the output terminal must be powered off to return to the initial state after conduction.

Images