Electronics > Projects, Designs, and Technical Stuff
international standard for ac/ac converter ("electronic transformer")
NiHaoMike:
--- Quote from: poorchava on June 26, 2020, 02:22:50 pm ---The scenario is that a potential customer is importing some battery powered equipment (dunno exactly, think a hedge trimmer or something like that) that has a charger which is supposed to work ok 110V. Dunno how it's built inside. Redoing the charger as a whole is outa question due to proprietary battery socket and cost.
I know that it will work, it's also easy to get right in terms of not blowing up. I also have a few years of experience in power electronics, but mainly high power (single digits kW range) DC/DC stuff for test equipment market.
I wonder however what would be the point of rectifying splitcapping the supply. The capacitors would have to be significantly large.
--- End quote ---
So basically switching power supplies. First check the label - a lot of stuff is universal voltage nowadays. If it's 120V only, the half bridge trick can use much smaller capacitors by increasing the switching frequency to 400Hz or so.
wizard69:
--- Quote ---The scenario is that a potential customer is importing some battery powered equipment (dunno exactly, think a hedge trimmer or something like that)
--- End quote ---
Give the customer a GPS coordinate to the nearest hardware store. This wouldn't be the first time that I see an engineering effort put into an already solved problem.
In the off chance this isn't a hedge trimmer there are numerous companies that make equipment specifically for this problem. This includes huge motor generator sets that can power entire production lines to plug in travel transformers for shavers.
ch_scr:
--- Quote from: Jay_Diddy_B on June 26, 2020, 03:35:44 pm ---Hi,
The schematic is this:
(Attachment Link)
[...]
--- End quote ---
Sadly this circuit does not work. Once the caps are charged up, the AC across the load goes away. There is no load across the DC.
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