240V->120V transformer heats up device?

[interuser]

Hi
I live in Europe and have a network router that operates powered by a
power supply (transformer of 240VAC->5VDC)

I bought the exact same router from US and plugged its power supply
(transformer of 120VAC->5VDC) on a 240VAC->120VAC transformer.

I notice that the US transformer heats up more than the european one.
It is more hot that the 240VAC->120VAC transformer.

Can anyone explain as to why this is happening?
Does it have anything to do with the frequency in the US being 60HZ as
opposed to here being 50HZ?

Note that the US power supply is attached onto the transformer , and
so some of the heat is transferred from the transformer to the power
supply.

 

[John Larkin]

On Sun, 16 Mar 2008 12:50:27 -0700 (PDT), interuser
<interuser@hotmail.com> wrote:

Hi
I live in Europe and have a network router that operates powered by a
power supply (transformer of 240VAC->5VDC)

I bought the exact same router from US and plugged its power supply
(transformer of 120VAC->5VDC) on a 240VAC->120VAC transformer.

I notice that the US transformer heats up more than the european one.
It is more hot that the 240VAC->120VAC transformer.

Can anyone explain as to why this is happening?
Does it have anything to do with the frequency in the US being 60HZ as
opposed to here being 50HZ?

Note that the US power supply is attached onto the transformer , and
so some of the heat is transferred from the transformer to the power
supply.

50 Hz supply will push cheap 60 Hz transformers somewhat into
saturation, and increase losses.

John

 

[Tom Biasi]

"interuser" <interuser@hotmail.com> wrote in message
news:fc1ec7ef-c0bd-45e0-bd0e-2974c2c0b844@c19g2000prf.googlegroups.com...

Hi
I live in Europe and have a network router that operates powered by a
power supply (transformer of 240VAC->5VDC)

I bought the exact same router from US and plugged its power supply
(transformer of 120VAC->5VDC) on a 240VAC->120VAC transformer.

I notice that the US transformer heats up more than the european one.
It is more hot that the 240VAC->120VAC transformer.

Can anyone explain as to why this is happening?
Does it have anything to do with the frequency in the US being 60HZ as
opposed to here being 50HZ?

Note that the US power supply is attached onto the transformer , and
so some of the heat is transferred from the transformer to the power
supply.

Just buy the euro power supply for that router.

 

[Phil Allison]

"interuser"

Hi
I live in Europe and have a network router that operates powered by a
power supply (transformer of 240VAC->5VDC)

I bought the exact same router from US and plugged its power supply
(transformer of 120VAC->5VDC) on a 240VAC->120VAC transformer.

I notice that the US transformer heats up more than the european one.
It is more hot that the 240VAC->120VAC transformer.

Can anyone explain as to why this is happening?
Does it have anything to do with the frequency in the US being 60HZ as
opposed to here being 50HZ?

** It is solely due to that fact.

120 volt primary transformers made for the US domestic market are simply not
designed to operate at 50 Hz. Making them do so by using a 230/120 step-down
transformer causes them to run hotter - sometimes MUCH hotter and this
can lead to failure of the transformer's insulation or the activation of an
internal thermal fuse.

Other problems include buzzing or humming noises emanating form the
transformer or nearby metal panels.

Toroidal transformers intended for 120 volt@ 60 Hz are most likely to be in
serious overload if ever operated at 50 Hz - even with no load applied to
the secondary.




....... Phil

 

On 3ÔÂ17ČŐ, ÉĎÎç3Ęą50ˇÖ, interuser <interu...@hotmail.com> wrote:

Hi
I live in Europe and have a network router that operates powered by a
power supply (transformer of 240VAC->5VDC)

I bought the exact same router from US and plugged its power supply
(transformer of 120VAC->5VDC) on a 240VAC->120VAC transformer.

I notice that the US transformer heats up more than the european one.
It is more hot that the 240VAC->120VAC transformer.

Can anyone explain as to why this is happening?
Does it have anything to do with the frequency in the US being 60HZ as
opposed to here being 50HZ?

Note that the US power supply is attached onto the transformer , and
so some of the heat is transferred from the transformer to the power
supply.

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On 3ÔÂ17ČŐ, ÉĎÎç3Ęą50ˇÖ, interuser <interu...@hotmail.com> wrote:

Hi
I live in Europe and have a network router that operates powered by a
power supply (transformer of 240VAC->5VDC)

I bought the exact same router from US and plugged its power supply
(transformer of 120VAC->5VDC) on a 240VAC->120VAC transformer.

I notice that the US transformer heats up more than the european one.
It is more hot that the 240VAC->120VAC transformer.

Can anyone explain as to why this is happening?
Does it have anything to do with the frequency in the US being 60HZ as
opposed to here being 50HZ?

Note that the US power supply is attached onto the transformer , and
so some of the heat is transferred from the transformer to the power
supply.

Do you want access to China's massive pool of electronic
manufacturers... but lack the time to contact suppliers, negotiate
contracts, arrange shipping or monitor product quality? Don't worry -
Let seriouswholesale deal with all that for you.

*Check out the huge range of Gadgets, MP3 / MP4 Players, Car DVD /
Audio, and Computer Accessories now by visiting the online wholesale
catalog at seriouswholesale. com You'll have peace of mind thanks to
the seriouswholesale Quality Control, 12-month Warranty on all
products, and easy secure payment by credit card through Paypal.

Selling on eBay or your own online store? Send products direct from
our warehouse to your customers using our unique drop-shipping
service. You can profit by selling hundreds of different products,
without holding any of your own inventory! Any questions you have will
be answered by the seriouswholesale English-speaking customer support
team... Their aim is to make your China electronics importing business
easier to run than ever before.

Welcome to http://www.seriouswholesale.com.

seriouswholesale - Buy from the source, profit without the hassle.

- 12 Months Warranty - No minimum order restrictions - Drop-shipping
with no additional fee - Pay by safely by PayPal seriouswholesale
Wholesale Co., Ltd.: Chinas original and best online electronics
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On Mar 18, 3:03 am, dirskys...@gmail.com wrote:

On 3ÔÂ17ČŐ, ÉĎÎç3Ęą50ˇÖ, interuser <interu...@hotmail.com> wrote:



Hi
I live in Europe and have a network router that operates powered by a
power supply (transformer of 240VAC->5VDC)

I bought the exact same router from US and plugged its power supply
(transformer of 120VAC->5VDC) on a 240VAC->120VAC transformer.

I notice that the US transformer heats up more than the european one.
It is more hot that the 240VAC->120VAC transformer.

Can anyone explain as to why this is happening?
Does it have anything to do with the frequency in the US being 60HZ as
opposed to here being 50HZ?

Note that the US power supply is attached onto the transformer , and
so some of the heat is transferred from the transformer to the power
supply.

Do you want access to China's massive pool of electronic
manufacturers... but lack the time to contact suppliers, negotiate
contracts, arrange shipping or monitor product quality? Don't worry -
Let seriouswholesale deal with all that for you.

*Check out the huge range of Gadgets, MP3 / MP4 Players, Car DVD /
Audio, and Computer Accessories now by visiting the online wholesale
catalog at seriouswholesale. com You'll have peace of mind thanks to
the seriouswholesale Quality Control, 12-month Warranty on all
products, and easy secure payment by credit card through Paypal.

Selling on eBay or your own online store? Send products direct from
our warehouse to your customers using our unique drop-shipping
service. You can profit by selling hundreds of different products,
without holding any of your own inventory! Any questions you have will
be answered by the seriouswholesale English-speaking customer support
team... Their aim is to make your China electronics importing business
easier to run than ever before.

Welcome tohttp://www.seriouswholesale.com.

seriouswholesale - Buy from the source, profit without the hassle.

- 12 Months Warranty - No minimum order restrictions - Drop-shipping
with no additional fee - Pay by safely by PayPal seriouswholesale
Wholesale Co., Ltd.: Chinas original and best online electronics
wholesaler & drop-shipper: seriouswholesale. com

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