Agilent N5772A 600V 2.6A 1560W Power Supply Teardown

[Jay_Diddy_B]

Hi Group,

I recently purchased a used Agilent N5772A 600V 2.6A Power Supply. This is a 1.56 kW Power supply in a 1U (43.6mm or 1.72 inches) high package weighing 8.5 Kg or 18.7 lbs.

Here is a link to the Power Supply on the Keysight website.

http://www.keysight.com/en/pd-839197-pn-N5772A/power-supply-600v-26a-1560w?nid=-35683.384510&cc=CA&lc=eng


Front Panel

On one side there is the nameplate and on the other side the controls and display:





Overview




This picture shows an overview. In the top left there is the an interface board. This power supply has HPIB (IEEE 488), LAN and USB interfaces. Underneath the interface board there looks to be a control board.

In the center on the left side there is the an output filter board.

There are two power boards each producing 600V 1.3A that are connected in parallel.

At the bottom of the picture is an auxiliary power supply and input filter.

Three fans keep the whole thing cool.


Input Filter and Auxiliary Power Supply



Power Board

There are two of these boards in the unit. Each board contains a Power Factor Correction stage and output section. There are two transformers and one inductor in the Output section.



Interestingly the boards are marked Nemic Lambda:



And TDK Lambda sells these remarkably similar power supplies:



Link to the TDK Lambda website:
http://www.tdk-lambda.com/products/sps/ps_system/gen/indexe.html#

Interface Board

The Interface board is clearly marked Agilent. The N5772A has LAN and USB interfaces which are not included on the TDK Lambda models.



Output Filter


Here is a picture of the output filter:




Regards,

Jay_Diddy_B

[Hydrawerk]

And TDK Lambda sells these remarkably similar power supplies:

A nice find!

[Vgkid]

Until you showed the Lambda label, i would say that it looks like a Lambda unit.

[NiHaoMike]

Interesting they used bus bars for a rather low current.

[cs.dk]

It sure looks like a TDK Lambda; https://www.eevblog.com/forum/testgear/lambda-powersupplys-any-good/

[HighVoltage]

I just bought recently a used one with 600V and 1.3A. (Model: N5752A)
When it arrived it showed only EEEE on the display but nothing worked.
Keysight Germany fixed it under warranty and now it works great.
But since I have warranty on it, it has a seal and I did not want to break it, just in case something.

Thanks for the tear down, really interesting.

I read that all of these types of Agilent / Keysight PSU's are made by Lambda.

One question:
Have you been able to control the PSU with BenchVue?
My attempt was not successful, although the Keysight website states that the PSU should be compatible to BenchVue.
The PSU is showing up in the I/O library, but BenchVue reports an instrument that is not supported.

[daqq]

Interesting they used bus bars for a rather low current.

I'm guessing that they use the same box and mechanical stuff for other models, so it makes sense to use the same system and set of assemblies. The models would then differ only in the actual power electronics and front panel sticker.

As for the TDK lambda similarity, I'm guessing that they are the same, only made under a different brand or with the agilent board for control or something like that. See:
http://www.us.tdk-lambda.com/hp/

[sprocket]

A German PSU company, Heinzinger, also rebrands these TDK lambda PSU.

We got a Heinzinger branded PSU in a sub-botton sediment profiler where I work. We also got the Agilent branded version that I'm using in a prototype build for an underwater towed sled that I'm currently developing at work. A sled used for making HD video recordings and surveys of Norway lobster burrows..

Both work flawlessly, I only got two complaints. They extremely loud, the fans are going full speed regardless of the load you put on it. Rather annoying to be honest. And the interface is a bit outdated to be honest. You either have  used SCPI commands for automation, use a rather archaic web browser interface and obviously the front panel. But those shortcomings could be fixed if Agilent would implement support for this PSU in their BenchVue software.

[Jay_Diddy_B]

Hi,

Was able to find some boards for this series of power supplies in various condition. Some have parts missing. I have photographed the board and included them in this thread.

AC Input Board - Single phase












600V 1.3A Output board

Two of these are used in parallel for 2.6A.











Regards,

Jay_Diddy_B

[Jay_Diddy_B]

Hi,

I also obtained some scrap boards for a 6V output and a 30V output. It looks like the PFC stage is the same or very similar. The output stage is different.

6V 100A Output Board













30V 25A Output Board








It looks like the 300V and 600V volt outputs are built one bare PCB. The lower voltage, higher current, outputs 6, 8, 12.5, 20, 30, 40, 60, 80, 100 and 150V outputs are built on another board.



Regards,

Jay_Diddy_B

[murrayatuptown]

No one asked, but 4 of the missing parts on the N5772A AC input PCB are TDK-LAMBDA 10 ohm 139 C  'fuse resistors', p/n DFP10112.