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sg858...@gmail.com  
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  More options Jul 3, 6:52 am
Newsgroups: sci.electronics.basics
From: sg858...@gmail.com
Date: Thu, 3 Jul 2008 03:52:56 -0700 (PDT)
Local: Thurs, Jul 3 2008 6:52 am
Subject: information about bridge rectifier
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hi thanks for ur kind informaation which u have given,but i want to
know a small detail about  bridge rectifier.
DOES THIS BRIDGE RECTIFIER CAN BE CONNECTED TO THE 230VAC/50HZ
SUPPLY ,WITH OUT TRANSFORMER. DOES IT WITH STAND THAT VOLTAGE OR IT
HAS TO ISOLATED.IF IT HAS ISOLATE YELL ME THE ALTERNATE METHOD TO
ISOLATE WITH OUT TRANSFORMER. KINDLY SOLVE THIS PROBLEM

THANK U


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Eeyore  
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  More options Jul 9, 1:14 pm
Newsgroups: sci.electronics.basics
From: Eeyore <rabbitsfriendsandrelati...@hotmail.com>
Date: Wed, 09 Jul 2008 18:14:12 +0100
Local: Wed, Jul 9 2008 1:14 pm
Subject: Re: information about bridge rectifier
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ian field wrote:
> <sg858...@gmail.com> wrote in message
> news:f23c82ef-534f-4ddb-928f-6bde073d4895@d77g2000hsb.googlegroups.com...
> > hi thanks for ur kind informaation which u have given,but i want to
> > know a small detail about  bridge rectifier.
> > DOES THIS BRIDGE RECTIFIER CAN BE CONNECTED TO THE 230VAC/50HZ
> > SUPPLY ,WITH OUT TRANSFORMER. DOES IT WITH STAND THAT VOLTAGE OR IT
> > HAS TO ISOLATED.IF IT HAS ISOLATE YELL ME THE ALTERNATE METHOD TO
> > ISOLATE WITH OUT TRANSFORMER. KINDLY SOLVE THIS PROBLEM

> > THANK U

> The best way is to find the data sheet and look up the PIV rating.

Or Vrrm as they tend to call it these days.

Graham


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ian field  
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  More options Jul 9, 2:26 pm
Newsgroups: sci.electronics.basics
From: "ian field" <dai....@ntlworld.com>
Date: Wed, 9 Jul 2008 19:26:22 +0100
Local: Wed, Jul 9 2008 2:26 pm
Subject: Re: information about bridge rectifier
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"Eeyore" <rabbitsfriendsandrelati...@hotmail.com> wrote in message

news:4874F1E4.939C3065@hotmail.com...

Damn these new fangled contraptions!

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ian field  
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  More options Jul 9, 10:15 am
Newsgroups: sci.electronics.basics
From: "ian field" <dai....@ntlworld.com>
Date: Wed, 9 Jul 2008 15:15:38 +0100
Local: Wed, Jul 9 2008 10:15 am
Subject: Re: information about bridge rectifier
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<sg858...@gmail.com> wrote in message

news:f23c82ef-534f-4ddb-928f-6bde073d4895@d77g2000hsb.googlegroups.com...

> hi thanks for ur kind informaation which u have given,but i want to
> know a small detail about  bridge rectifier.
> DOES THIS BRIDGE RECTIFIER CAN BE CONNECTED TO THE 230VAC/50HZ
> SUPPLY ,WITH OUT TRANSFORMER. DOES IT WITH STAND THAT VOLTAGE OR IT
> HAS TO ISOLATED.IF IT HAS ISOLATE YELL ME THE ALTERNATE METHOD TO
> ISOLATE WITH OUT TRANSFORMER. KINDLY SOLVE THIS PROBLEM

> THANK U

The best way is to find the data sheet and look up the PIV rating.

The bodgers method is to connect the rectifier to the mains with a 40W lamp
in series with one of the AC terminals to limit the current if the rectifier
goes S/C.

Of course this does not guarantee that the rectifier will withstand mains
voltage in the long term - you need to have a safety margin. If you put 2
capacitors in series across the + & - terminals with the junction to one of
the AC terminals, this forms a voltage doubler.

A better plan yet is to use a resistor to limit current instead of the lamp
(33k/2W for 110V or 2x 33k/2W for 230V) this should limit the current to the
point that if the PIV is exceeded, the rectifier's leakage current will halt
the voltage rise - which you can then measure.


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Eeyore  
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  More options Jul 10, 12:42 am
Newsgroups: sci.electronics.basics
From: Eeyore <rabbitsfriendsandrelati...@hotmail.com>
Date: Thu, 10 Jul 2008 05:42:30 +0100
Local: Thurs, Jul 10 2008 12:42 am
Subject: Re: information about bridge rectifier
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Whyy DID they change it ? IEC probably.

AND don't forget to allow an extra say 50% on top for transients.

Graham


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