Relay with sma wire drive mechanism

Abstract

The invention provides a relay with a SMA wire drive mechanism. The shape memory characteristic of a SMA wire is used to achieve the purpose of changing the working state of the relay, the SMA wire can be restored to its original shape or length as long as the SMA wire is heated, and the relay can constantly maintain effective action without magnetic field interference compared with a mechanical relay mode. In addition, according to the relay of the present invention, the setting of a core, a coil and the like is not needed, so the accommodating space in the relay becomes large, circuit unitsof various functions can be accommodated, so the relay is individually controlled, and the action state is recorded and returned.

Description

technical field [0001] The invention relates to a relay, in particular to a relay which uses an SMA wire to change the working state. Background technique [0002] A relay is an electronic control device, usually used in automatic control circuits. The relay switches between two states to make the contact points of the contact system contact or disconnect. It can be regarded as an automatic switch or control switch, and is widely used in power protection, automation, remote control, measurement and communication devices. [0003] Relays can be divided into mechanical relays and solid-state relays according to their working principles. Mechanical relays are generally composed of iron cores, coils, armatures, and contact reeds. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect. The moving contact engages with the static contact (normally closed contact). When the coil ...

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Problems solved by technology

[0004] However, mechanical relays are usually installed in various control circuits of various devices together with a large number of electronic components, and many electronic components also operate on the principle of electromagnetic induction, so electromagnetic relays will more or less generate magnetic fields with other electronic components Interference affects each other's actions. In addition, the mechanical relay must be equipped with components with a certain volume such as iron cores and coils. In addition to causing the overall volume of the mechanical relay to be smaller, the internal space of the mechanical relay can be set. The number of components is also limited, so that the relay can still only function as a switch

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