The functions of solid-state relays are switching and protection circuit functions, as follows:
Switching function. By adding a control signal to the input terminal of the solid-state relay, the output terminal can change from the off state to the on state (it will be in the blocking state when there is no signal), thereby controlling a larger load.
Protective circuit function. Solid state relays can be used as protection devices for short circuit protection, overload protection, overcurrent protection, overheating protection and other circuits.
In addition, solid-state relays also have the advantages of good anti-corrosion and moisture-proof performance, good isolation performance, low noise, and long life. Therefore, they are widely used in industrial automation control, computer peripheral interface equipment, electric furnace heating systems, cooked control machinery, and remote control. They are widely used in machinery, motors, solenoid valves, signal lights, scintillators, stage lighting control systems, medical equipment, copiers, washing machines, fire security systems and other occasions.
Solid-State Relay Definition
Solid-State Relay (SSR) is a control device that uses semiconductor devices as switching elements to achieve electrical isolation and signal conversion.
It consists of three parts: input circuit, drive circuit and output circuit. It has the characteristics of small size, long life, fast response speed and strong reliability.
The working principle of solid-state relays
The working principle of solid-state relays is that when the input circuit receives a control signal, the semiconductor devices (such as transistors, field effect tubes, etc.) in the drive circuit It will be triggered, causing the output circuit to be turned on or off, thereby achieving electrical isolation and signal conversion.
Reference material: The difference between solid-state relays and ordinary relays