The working principle and characteristics of magnetic latching relay
Magnetic latching relay is a new type of relay developed in recent years, and it is also an automatic switch. Like other electromagnetic relays, it automatically switches on and off the circuit. The difference is that the normally closed or normally open state of the magnetic latching relay is completely dependent on the action of permanent magnets, and the switching of its switching state is triggered by a pulsed electrical signal of a certain width.
Magnetic latching relays are generally composed of iron cores, coils, armatures, contact reeds, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow in the coil, resulting in an electromagnetic effect, and the armature will overcome the pulling force of the return spring and attract to the iron core under the action of the working principle and characteristic electromagnetic force. Thereby, the movable contact of the armature is driven to engage with the static contact (normally open contact).
When the coil is powered off, the electromagnetic suction also disappears, the armature will return to the working principle under the reaction force of the spring, and the original position of the characteristics will make the moving contact and the original static contact (normally closed contact) pull in. In this way, the suction and release are achieved, so as to achieve the purpose of conducting and cutting off in the circuit. For the "normally open and normally closed" contacts of the magnetic latching relay, it can be distinguished as follows: the static contact that is in the open state when the relay coil is not energized is called "normally open contact"; the static contact that is in the connected state The points are called "normally closed contacts".
When the input quantity (such as voltage, current, temperature, etc.) reaches the specified value, the electrical appliance that makes the output circuit controlled by the working principle and characteristics turn on or off. It can be divided into two categories: electrical quantity (such as current, voltage, frequency, power, etc.) relays and non-electrical quantity (such as temperature, pressure, speed, etc.) magnetic latching relays. Working principle, the characteristics have the advantages of fast action, stable work, long service life and small size.
Widely used in power protection, automation, motion, remote control, measurement and communication devices. Magnetic latching relay is an electronic control device. It has a control system (also known as an input loop) and a controlled system (also known as an output loop). It is usually used in automatic control circuits. It actually uses a smaller current to control A type of "automatic switch" for larger currents. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.
