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Solid State Relays

Solid State Relays (SSRs) are devices that control electrical current using semiconductor switching technology. Common types include SCRs, triacs, and MOSFETs. They are typically employed for switching power loads from low voltage DC or AC control sources. Their primary features are their low cost, ease of use, and high density operation.

AQY212EH Application Field and Working Principle

The AQY212EH is an AC-input Solid State Relay developed by Omron. It is designed for an array of application fields such as industrial control, CNC machinery, factory automation, medical instruments, and automotive electronics. Utilizing a low on-resistance MOS FET, the AQY212EH offers a high reliability performance and low heat dissipation.

This SSR has an AC rated input voltage of 100 V to 250 V AC and an output load current of 30 A AC with a voltage range of 0 to 250 V AC. Its power consumption is 50 mW and noise suppression meets the CISPR EN 61810-1&2 standards. The relay has an operating temperature range of -40° C to 65° C.

The application field of the AQY212EH is expanded with a switching capacity of 30 A and wide range of voltage and temperature. It is a full wave bridge type solid state relay with a single phase and includes a built-in zero-cross detection circuit. In addition, it is also equipped with a “spring” contact which can be utilized for mounting and external wiring purposes.

The working principle of the AQY212EH is based on the MOSFET integrated circuit. When the firing circuit receives a signal, the SCR is triggered and the PWM detects the zero cross point, allowing it to change from a non-conductive state to a conducting state. The MOSFET, in turn, switches on and off in response to the PWM signal. To de-energize the relay, the firing circuit is opened, causing the SCR to turn off and the MOSFET to return to the non-conductive state.

The AQY212EH Solid State Relay is a great choice for applications which require a reliable, low-cost SSR with a wide range of input and output capabilities. Its highly reliable MOSFET switching with low on-resistance and low noise levels make it a favorite for industrial, automotive, and other applications.

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