I need advice to design a filter for uC supply 220Vca to 15Vdc -1A
It is running in a noisy environment and from time to time I found the uC hanged.
By now it is just a transformed+full bridge diode+ cap filtering.
Should I connect the (-) to earth ? Now is isolated.
Should I use a filter like used in PC power supply input ? (common+diff I think)
In noisy environment you should implement AC EMI filter and MCU Vdd-Vss filter as shown in this article:
"Tech Tutorial: Improve the transient immunity of microcontroller-based embedded designs" **broken link removed**