Ultrafast bridge rectifier module question

Click For Summary
SUMMARY

The discussion centers on the need for a high-frequency diode bridge rectifier module suitable for a 50kHz square wave from a switched-mode power supply (SMPS) transformer. Users currently employing MUR1620 fast diodes in TO-220 packages face challenges with thermal attachment to heatsinks. Recommendations include using dual diodes such as MUR1605CT and MUR1620CTR for improved efficiency and space-saving designs. The conversation highlights the search for compact, high-current rectification solutions that can handle peak reverse voltages of around 400V and forward currents of 20-30A.

PREREQUISITES
  • Understanding of diode specifications, particularly fast recovery diodes
  • Familiarity with TO-220 package thermal management techniques
  • Knowledge of switched-mode power supply (SMPS) operation and design
  • Basic principles of rectification and bridge configurations
NEXT STEPS
  • Research high-frequency diode bridge rectifier modules suitable for 50kHz applications
  • Explore thermal management solutions for TO-220 packages, including insulating washers and heatsink grease
  • Investigate dual diode configurations like MUR1605CT and MUR1620CTR for compact designs
  • Learn about the implications of using center-tapped transformers in rectification circuits
USEFUL FOR

Electrical engineers, power electronics designers, and hobbyists working with high-frequency rectification in SMPS applications will benefit from this discussion.

Robertphysics
Messages
16
Reaction score
3
Hi , I have a 50khz square wave from a smps transformer and currently I am using MUR 1620 fast diodes but since they come in individual trasistor type TO220 type packages I have some problems with attaching them properly to heatsink , does anyone know are there any nice diode bridge modules like those that come for mains 50hz that could be used for high frequency ?

I want something like in the attached picture
 

Attachments

  • ^363DC0C08D77584A314A70C16786ADEA99CF3FEE0D17826563^pimgpsh_fullsize_distr.jpg
    ^363DC0C08D77584A314A70C16786ADEA99CF3FEE0D17826563^pimgpsh_fullsize_distr.jpg
    14.1 KB · Views: 600
Engineering news on Phys.org
Robertphysics said:
Hi , I have a 50khz square wave from a smps transformer and currently I am using MUR 1620 fast diodes but since they come in individual trasistor type TO220 type packages I have some problems with attaching them properly to heatsink , does anyone know are there any nice diode bridge modules like those that come for mains 50hz that could be used for high frequency ?
+
what max current rating do you need ( as in maximum current likely to be drawn) ?
 
Robertphysics said:
TO220 type packages I have some problems with attaching them properly to heatsink
Can you say more about this? TO-220 packages usually attach well to heatsinks. If you are having isolation problems and want to use a single heatsink, are you familiar with insulating washers and heatsink grease?

http://thumbs4.ebaystatic.com/d/l225/m/mrJXeTm3JsEf-8CXEAaGfPg.jpg
mrJXeTm3JsEf-8CXEAaGfPg.jpg
 
No it's ok to 220does attach ok to heatsinks it's just that the smps is custom built and I didin't have good neough place for the many required fast rectifier diodes , I did manage to get them in but if I could have a solid square 4 pin bridge like I have for mains that would be much better for me and much easier to attach thermally , my average need is about 400v peak reverse voltage and about 20/30 amps of forward current that would be enough probably with reserve
so I was just wondering whether such things exist like fast diode rectifier bridges for square wave rectification
or are there only individual to220 packages that are then arranged by 4 in a bridge?
 
What frequency do you intend to run this at? You say square wave. How fast do your edges need to be?

BoB

Edit: "50kHz" Oops i missed the "k"
 
Last edited:
Robertphysics said:
Hi , I have a 50khz square wave from a smps transformer

I'm assuming that the secondary of the transformer isn't. but if you has a centre-tapped secondary then you could use just one of these

http://www.farnell.com/datasheets/2045664.pdf?_ga=1.187482731.272050964.1481326413

and have full wave rectification ... substantially less room needed than a 4 diode bridge package or 4 individual diodes as you originally contemplated

I have searched a couple of the major component suppliers and have not been able find a 4 diode high speed and high current packageDave
 
Rather than using 4x MUR1620 single fast recovery diode.
Use dual diodes, MUR1605CT common cathode, with MUR1620CTR common anode.
 
Baluncore said:
Rather than using 4x MUR1620 single fast recovery diode.
Use dual diodes, MUR1605CT common cathode, with MUR1620CTR common anode.

yes, that is the other way I was going to suggest if the secondary winding isn't centre-tapped
 

Similar threads

Need to use a rectifier.... but where to put it?
  • · Replies 7 ·
Replies
7
Views
2K
Revolutionizing SMPS Efficiency with Innovative Pulsed Operation Technique
  • · Replies 19 ·
Replies
19
Views
2K
Is it possible to charge/discharge this cap fast enough?
  • · Replies 9 ·
Replies
9
Views
2K
Signal Rectifier Circuit -- clarification questions from The Art of Electroics
  • · Replies 8 ·
Replies
8
Views
2K
Protection on Step up and Step Down Converter Module Bucks
  • · Replies 1 ·
Replies
1
Views
2K
Build a H-Bridge Circuit: Tips & Info
  • · Replies 10 ·
Replies
10
Views
8K
Bridge rectifier based mains (line) frequency doubler for an induction motor
  • · Replies 8 ·
Replies
8
Views
5K
Half controlled single bridge rectifier
  • · Replies 6 ·
Replies
6
Views
3K
Drawing Electric Arcs at 230 Volts
  • · Replies 4 ·
Replies
4
Views
2K
What is the Type of Laser Used in My Wine Raman Spectrometer?
  • · Replies 7 ·
Replies
7
Views
2K