Re: Voltage Converter?

On Mar 30, 2:19 am, da...@xxxxxxxxx (Dave Martindale) wrote:
You're actually talking about two different power supply designs.

Many desk/tower computers have a power supply with a 120/240 V switch on
them. The switch changes the configuration of the input circuitry to
either be a normal full-wave rectifier (when set to 240) or a voltage
doubler (when set to 120). When set correctly for the voltage applied,
the input capacitors have about 300 V across them and this powers the
rest of the power supply. It's basically a circuit designed for a
single supply voltage, with a switchable voltage doubler in the input.

I discussed many power supplies that meet a criteria called
"universal power supply". Also discussed is another type that does
multiple voltages by manually switching a 110/220 switch. Some
manufacturers would take out that power switch, replace that switch
with an IC, and create a "universal power supply". It could be that
simple.

No, laptops supplies need not use that 'switch replacement' IC
because that supply can be designed from scratch. However even 20
years ago, power supplies with a 110/220 switch were also manufactured
with an automatic switch - that IC - so that it switches automatically
on 120 volts or 240 volts without human action. "Universal power
supplies" were even common in some video monitors 20+ years ago. IC
to replace that switch was only one way to create a "universal supply"
20+ years ago. The point - universal supplies have existed for
decades.

If a portable appliance does not implement a "universal power
supply", then what else was forgetten? Universal supply should be
standard in any portable appliance.

What power plug for that country? See:
http://www.interpower.com/ic/guide.htm
.

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