Slave Actuator for Automatic Home or Building HVAC System

Renesas' slave actuator unit(s) control a fan or HVAC in one room or section of a home or building by following instructions from the master actuator.

This can be one or all of the following fan controls: RPM of a brushless DC (BLDC) fan motor; direction of flow, i.e., in/out (and optionally swipe up/down, left/right); flow sensor (liter/min); and electrical heater 0% to 100%.

If the actuator controls an HVAC rather than a simple fan, it may have additional sensors and outputs of its own, such as an RPM of a BLDC compressor motor or a compressor pressure sensor (bar), to better control the HVAC.

An additional GUI using capacitive touch, simple push buttons, an LCD, or a combination of those can be used to display local values and enter data. A more sophisticated GUI can also be achieved via a master actuator, IP gateway, or smartphone. A real-time clock (RTC) can easily be added to switch between different operation modes depending on the day, time, holiday, and more. All RTCs can also be synchronized within the system.