Function Of Bridge Rectifier In Electronic Circuit

By on June 26, 2007



 bridge rectifier

The purpose of a bridge rectifier in electronic circuit is to convert the ac voltage (wave) into Dc voltage. Usually it is located near the ac supply area. It can come in the 4 separate diodes arrangement or in a single package as seen from the photo. The specification that you need to know for a bridge rectifier are the peak reverse voltage (PRV) and the ampere. How do we know the spec of a bridge rectifier? By looking at part number printed on the body.  The part number usually start with KBLXXX and you have to search a data book to look for the specification. Always replace the bridge rectifier with the same or a higher specification.

If you have the time, you can always join four separate diodes to form a bridge rectifier. Use the general purpose part number such as the 1N4007 to make a bridge and sometime this rectifier can even work better than the original one.

Whenever a fuse open in electronic equipment, you must always check the bridge rectifier. Chances is high that the bridge may go shorted too. If you experience enough, you may check the bridge rectifier while it is still on board. If you are a beginner, i suggest that you remove the bridge and test it with you multimeter. In Monitor repair,usuallly a replacement of a fuse and a bridge rectifier will restore to normal operation.

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7 Comments

  1. chrisz

    July 25, 2010 at 7:51 am

    I'm trying to repair my power board on an Insignia model inc2325. My Lcd Tv will not turn on. The capacitors are all visually fine and power is running to the board. The fuse on the board is also good.The only way I'm getting the Tv to power up is by heating the bridge rectifier with a blow dryer. I'm not at all an expert at fixing lcd tv's. I've brought the Lcd tv to a repair man but he does not Know what the problem is and refused to spend anymore time on it. I've also purchased a board that was similar, but some of the components are different and that does not work. Do you think that the bridge rectifier has to be changed? Any input would be appreciated.

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  2. admin

    July 26, 2010 at 7:59 am

    HI Chrisz,

    If there is no power output from the power supply and when you heat up the bridge and the power came back then most likely the bridge or the corresponding component may have problem. Since bridge rectifier is cheap then you should replace and retest to see how it goes. If after replacement still with the same symptom then i suggest that you check the surrounding components. Make sure the power IC is receiving good supply voltage

    Jestine

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  3. Karabo

    May 5, 2011 at 9:44 am

    Straight explanation it is thanks...

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  4. Eddy Edward

    May 3, 2013 at 11:01 pm

    What other functions can the Bridge Rectifier perform other than conversion of AC(wave) into DC voltage in a circuits?

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    • Jestine Yong

      May 6, 2013 at 3:01 pm

      HI Eddy,

      Good question. So far in my daily repair job bridge was used in the conversion of AC into DC. If you check out the link below it has some other functions:

      http://www.cnczone.com/forums/product_announcements_manufacturer_news/123694-use_bridge_rectifier_function_bridge_rectifier.html

      Jestine

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  5. Meshal

    November 21, 2014 at 5:36 am

    Dear Jestin,

    I have defective bridge rectifier 4 A 600 V on my piwer supply . Is it safe if i replace it with higher such as 8 A 800V ? . What if i replace it with lower rate?

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    • admin

      November 21, 2014 at 10:27 am

      Hi meshal,

      Yes you can replace with the higher volt and amp and not the lower spec one. if you replace with lower spec component chances for it to blow would be very high.

      Jestine

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