Application Field
A company engaged in the research and development, production, and sales of semiconductor discrete devices
In-depth analysis of the working principle of solid relay
Solid state relay (SolidStateRelays, referred to as SSR) is a non-touch electronic switch, which is composed of discrete components, fixed resistance network and chip. The electrical isolation and signal coupling of the control circuit (input circuit) and the load circuit (output circuit) are completed through mixed process assembly, and the on-off switching function of the load is completed through solid-state equipment, without any moving parts inside.
Although there are many types of solid state relays on the market, their operating principles are quite different. It mainly consists of three parts: input (control) circuit, drive circuit and output (load) circuit. The input circuit of the solid state relay is the input control signal supply circuit, making it the trigger signal source of the solid state relay.
Solid state relay input circuit is mostly DC input, individual communication input. DC input circuit is divided into resistive input and constant current input. The input manipulation current of the resistive input circuit has a positive linear relationship with the input voltage. Constant current input circuit, when the input voltage reaches a certain value, the current will not increase significantly with the increase of voltage, this relay can adapt to the larger input voltage scale.
The driving circuit of solid state relay consists of three parts: isolation coupling circuit, function circuit and trigger circuit. Separate from the coupling circuit, the current commonly used circuit mode is photoelectric coupler and high frequency transformer. The common photoelectric coupling equipment mainly includes light-triode, light-triac, light-diode array and so on.
More information
Follow Us
Contact Us
Address: Building 8, Ganquan Ecological Science Park, Hanjiang District, Yangzhou City
Telephone:0514-87178001
Personnel mailbox:hr@wdsemi.com
Sales mailbox:sales2@wdsemi.com
Website:www.wdsemi.com