LT4320 based active rectifier

[prasi]

hello folks,
here is something i have been working on for some time.
I am willing to offer the pcbs as a group guy.
let me know if there is interest.
I will share a bom to GB subscribers, all mouser based, if GB goes ahead.
regards
Prasi

Edit 1: Group buy closed for THT PCBs, but still open for SMD PCBs. More info in the below link.
Group Buy List
group list qty_new - Google Sheets
Schematic SMD LT4320 rectifier LT4320 based active rectifier
Schematic THT LT4320 rectifier LT4320 based active rectifier
Schematic LT4320 CRC PSU PCB: LT4320 based active rectifier

Edit 2: Revision in prices. (price drop!)
LT4320 based active rectifier

Edit 3: GB closed for SMD PCBs. Only last 10 pairs of THT pcbs remain.

THT BOM BY MERLIN EL MAGOO LT4320 based active rectifier

EDIT 4: New GB for LT4320 based CRC PSU PCB Started..PCB's Produced and being shipped..-Completed and closed...
1. The Design: LT4320 based active rectifier
2. The PCB design: LT4320 based active rectifier
3. Physical PCB's: LT4320 based active rectifier
4. The BoM : LT4320 based active rectifier

EDIT 5: Group buy sign up has begun for modified SMD and THT rectifier boards with ENIG finish and earlier LT4320+CRC PSU PCBs. Please sign up at the below google sheet with your DIYA username and qty required against each pcb type.
LT4320 based active rectifier
Some 3D views of how the actual PCB assembly looks like
SMD: LT4320 based active rectifier
THT: LT4320 based active rectifier
CRC PSU PCB : LT4320 based active rectifier

[av-trouvaille]

Hi Prasi,

Some questions, if allowed:
- Can you please elaborate on why this is interesting?
- Can it replace an existing rectifier bridge?
- How difficult is it to solder?

[prasi]

1. minimal power dissipation, no heatsink for rectifier, higher DC voltage output for a given AC voltage, etc

2. yes, it is a drop in replacement for SIP-4 type rectifiers.

3. THT option for LT4320 provided, MOSFETs are SMD, but will be simple to solder for anyone who has soldered SMD's before.

regards
Prasi

[xrk971]

I think more info on this is available here before it spun off onto its own thread. This version uses a double-die MOSFET. I can attest that this topology works very well - almost no heat, added headroom due to no voltage drop across silicon diodes, smooth switching with no noise spikes since phase is timed with zero crossing:

GB: CRCRC PSU





I am using this type of rectifier in the SLB PSU because of these advantages.

Nice little rectifier you are planning to make here, Prasi.

[prasi]

thanks x, yes, there will be some improvements for sure from tester ones, still working on them.

need to find some time.

[gary s]

Hi prasi, do you think there would be more demand for your PCB if you made it using through hole components rather than SMT devices.

I assume you are trying to make it as small as possible.

[xrk971]

EYou could use 4 x TO220 MOSFETs with no heatsink. The LT4320 is already TH as an option. Just add a spot for 1uF ceramic x7r radial cap.

The SMT keeps package about same size as the monolithic bridges.

[Lo_Tse]

Subscribed. Would like to try this out. I wish the 4320 controller chip is cheaper though

Regards,

[nautibuoy]

Interesting

[prasi]

Originally Posted by gary s

Hi prasi, do you think there would be more demand for your PCB if you made it using through hole components rather than SMT devices.

I assume you are trying to make it as small as possible.

Hello Gary, let me try it with dual secondary , 2 of the LT , and 8 of the mosfets but it wont be a compact replacement for SIP-4 rectifiers; rather it will be a regular PCB that needs mounting holes, run wires to bulk cap PCB, etc.

regards
Prasi