Solid state relays are switch relays that do not require the use of any mechanical components. This usually makesSSPC Solid StateSolid state relays have the advantage of longer lifespan than ordinary electromechanical relays, although they are much faster than electromechanical relays, they do have some design requirements. Solid state relays have swept the globe, completely changing the power distribution of various industries from agricultural automation to aerospace. But you may wonder how this solid-state relay or SSPC module works. That requires explanation and analysis from the basics of solid-state relays to optoisolators and optocouplers, photodiodes, and PN junctions.

Solid state relays are typically designed as a simple switch with power and load terminals that switch when an external control signal is transmitted to the relay through another terminal. When this happens, the switch occurs very quickly, and the load is usually powered by MOSFET power transistors.

Solid state appliances can also be designed and used for AC or DC switch capacity, but the internal configuration must be modified to be suitable for any situation. DC relays can work with a single MOSFET, with the source and drain of Mos connected to the power supply and load of the main circuit, and the control signal connected to the pass gate. The control signal can be very low power, which allows relays (and large load circuits) to be controlled by small things like Arduino. Solid state relays can have multiple transistors arranged in parallel to allow for higher rated current values, with a rated current of up to 100 amperes. If it is an AC switch, at least two transistors are required because when the relay is in the off state, a MOSFET cannot suppress current in both directions. When the power supply of two transistors is cut off, their signals are cut off.

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