STEVAL-IHM041V1: 7A, 120 VACin, Universal Motor Driver

The STEVAL-IHM041V1 is a Triac based phase angle control for universal motor speed control using an STM8S103F3, 8-bit microcontroller, to set the conduction angle of the Triac.

The board may be operated in either open loop mode or in closed loop speed control mode,with an AC tach, hall sensor or opto sensor feedback. The open loop mode may also be used as a lamp dimmer.

The board is designed to operate from a 120V/60Hz mains, but may be easily modified to operate on other mains voltages by changing components in the power supply and motor voltage sensing circuits.

Suggested component values for other mains voltages are shownin the alternate bill of materials. On power-up, the firmware determines if jumper J4 is installed or not. The board operates in open loop mode if J4 is not installed and in closed loop mode if J4 is installed. When operating in closed loop mode, an AC tach or a hall effect device is connected to J3 to provide speed feedback.