rustybkts wrote:
Hi Lee, my point entirely because although most appliances are fully
insulated from the end of the cable, a charger potentially has open cables
which can track to earth when incorrectly handled.
Exactly. Note that the J1772 connector has been designed specifically
for direct, non-isolated AC charging. They went to drastic measures to
be absolutely sure no one can touch those pins and get a shock.
Switch mode (buck boost) power supplies reduce the isolating transformer to
very compact sizes and I would seriously question the necessity for anyone
to supply electronics which are not safe.
The buck-boost topology is *not* isolated. One side of the input is
directly wired to output.
But there are lots of isolated converter technologies. They have a
transformer to totally isolate input from output. They cost more than
buck-boost, but are safer.
To your point: Notice that even the cheapest el-trasho consumer products
*still* have isolated power supplies. They have figured out that the
added cost to the product is justified because:
a) non-isolation increases the chances for something to go wrong,
b) more drastic consequences from these failures, so
c) their customers are smart enough to demand isolation, and
d) lawsuits from killing even one customer would put them out
of business.
--
ICEs have the same problem as lightbulbs. Why innovate and make better
ones when the current ones burn out often enough to keep you in
business? -- Hunter Cressall
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
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