Strange situation yesterday. I powered up my DIY bench PSU but the mains (240VAC) plug into the unit does not always make full contact and it therefore shut down abruptly. When this happened the auto fan on our gas cooker (which normally comes on when the oven door has been opened) turned on. The radio also turned itself on! Both these items are running off the same ring main as the Power Supply. Rightly or wrongly I'm believing that this may be a result of back EMF in the PSU transformer when the field collapsed suddenly?
If this is the likely cause of events I understand that diodes or MOVs are generally used as back EMF suppression. I would appreciate your thoughts/advice on:
a) Am I right in thinking back EMF is likely to be the cause of random triggering of circuits on the same ring main?
b) if so, what would be the best form of suppression to prevent this happening?
On the other hand, perhaps I'm completely wrong in my theory and you can put me straight
If this is the likely cause of events I understand that diodes or MOVs are generally used as back EMF suppression. I would appreciate your thoughts/advice on:
a) Am I right in thinking back EMF is likely to be the cause of random triggering of circuits on the same ring main?
b) if so, what would be the best form of suppression to prevent this happening?
On the other hand, perhaps I'm completely wrong in my theory and you can put me straight