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Forum Index : Electronics : Bridge rectifiers
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dave r Newbie  Joined: 19/04/2006 Location: AustraliaPosts: 11 |
Good day Just a question from someone not really up with electronics. I have just purchased 3 15 amp recfifiers from Dick Smiths. I noticed that the circuit on this site uses 3* units where as the circuit on yourgreendream site uses 2. Can someone just explain the difference Thanks in advance Dave R dave rankin |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi Dave Each Bridge Rectifier has 4 diodes in it, but we only need 2 for each phase ( wire ) from our alternator. So on a 3 phase machine ( 3 wires ), we need 6 diodes, or 1 and a half bridges. So thats explains why some sites only use 2 bridge rectifiers, using all 4 diodes in one and 2 diodes in the other. But what I prefer to do is use all 4 diodes in each bridge rectifer for each phase. If a bridge rectifier is rated at 15 amps, then by doubling up on the diodes I've doubled the amps it can handle, up to 30 amps. So by using 3 bridges, I've doubled the power it can handle compared to using only 2 bridges. So I get twice the capacity for only 33% more cost. But either way is fine. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| dave r Newbie Joined: 19/04/2006 Location: AustraliaPosts: 11 |
Thanks for the reply Glenn That makes it easy to understand. Regards Dave dave rankin |
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wallablack Senior Member  Joined: 10/08/2011 Location: AustraliaPosts: 164 |
This is, I am assuming, the wiring diagram in question. LINKY Does using 2 instead of 3 bridge recs have any performance downfalls? Foolproof systems do not take into account the ingenuity of fools. |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Since the circuit with 3 bridge rectifiers ( as shown here ) uses 2 diodes in parallel, there may be a tiny gain in power as there is less loss through the rectifier, but I guess the gain would be almost unmeasurable. So no, I dont exepect there is any noticable performance gain in using 3 bridges instead of 2. There is a reliability gain with 3 bridges, since each diode is passing less current. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| wallablack Senior Member Joined: 10/08/2011 Location: AustraliaPosts: 164 |
Okay, so, current question. If I had 2 x 50 Amp 1000V KBPC5010,s wired -ive to -ive / +ive to +ive what would the voltage and amperage rating be? If I had 3 x 50 Amp 1000V KBPC5010,s wired -ive to -ive to -ive / +ive to +ive to +ive what would the voltage and amperage rating be? Foolproof systems do not take into account the ingenuity of fools. |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
A. 1000V 50amps B. 1000V 100 Amps Basically your doubling its current carrying capacity, for and extra 50% in cost. Thats why I prefer the 3 bridge recitfiers. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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