Hi Badcap members.
This is a question on switch mode power supplies found in household appliances such as TVs, monitors and computers and the possible problems of sustained over voltage conditions on the rectifier. I have read the FAQ on switch mode power supplies which talks a bout selectable voltage inputs and the affects of connecting 240Vac when selected for 115Vac. But this question is on self sensing switch mode power supplies.
I live in Australia which has a nominal line voltage of 240Vac at 50 Hz. My house utilizes 3 phases with one phase a few volts higher than the other two phases. During the day it is quite normal to have 260 Vac on one phase and 257 Vac on the other two.
Looking at all my appliances all have a rated voltage input of 100-240Vac. Doing a quick search on the internet I do find some switch mode power supplies rated for 100-260Vac. I'd be more comfortable if appliances sold in Australia had such an input voltage range.
Is sustained over voltage something to be concerned about? Manufacturers are selling appliances in Australia with 100-240Vac SMPS so I must assume that they consider possible over voltage as a non-issue. I'm looking to get an in-line UPS for some of my more critical appliances such as computer and monitor which is about a $400 investment. I believe Australia has one of the highest line voltages in the world?
Thanks,
James.
This is a question on switch mode power supplies found in household appliances such as TVs, monitors and computers and the possible problems of sustained over voltage conditions on the rectifier. I have read the FAQ on switch mode power supplies which talks a bout selectable voltage inputs and the affects of connecting 240Vac when selected for 115Vac. But this question is on self sensing switch mode power supplies.
I live in Australia which has a nominal line voltage of 240Vac at 50 Hz. My house utilizes 3 phases with one phase a few volts higher than the other two phases. During the day it is quite normal to have 260 Vac on one phase and 257 Vac on the other two.
Looking at all my appliances all have a rated voltage input of 100-240Vac. Doing a quick search on the internet I do find some switch mode power supplies rated for 100-260Vac. I'd be more comfortable if appliances sold in Australia had such an input voltage range.
Is sustained over voltage something to be concerned about? Manufacturers are selling appliances in Australia with 100-240Vac SMPS so I must assume that they consider possible over voltage as a non-issue. I'm looking to get an in-line UPS for some of my more critical appliances such as computer and monitor which is about a $400 investment. I believe Australia has one of the highest line voltages in the world?
Thanks,
James.
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