Solid state relays bring energy harvesting to IoT

Solid state relays from Semtech expand the company’s Neo-Iso and enable self-powered control systems in IoT applications, such as smart thermostats, alarm panels, factory automation systems and smart controls.

The TS13102 can autonomously harvest energy, even when its switch is closed and without the assistance of a microcontroller. The harvested energy is stored in a system capacitor and can be shared across multiple channels in the system driving several loads simultaneously. The TS13103 has a Power Transfer Output pin to transfer the harvested energy on the other side of the isolation barrier to the controller of the system. The design allows for smaller systems that can last decades without needing their batteries replaced. It also eliminates the need to include costly transformers and AC/DC power supplies with the system, which reduces the bill of materials.

Both relays have a new, enhanced communication scheme that allows the controller to send specific commands through the control line to perform a variety of functions, including receiving diagnostic information. The control and feedback lines can be shared across multiple channels, to reduce the system microcontroller pin count.


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