SMU recommendations - Page 1
Forum section: electronics / testgear

author: brabus
author_rank: Frequent Contributor
timestamp: December 10, 2019, 08:55:51 am
content: Hello everyone,In order to test some BLDC drivers, I am looking for a Source Measure Unit which can deliver up to 50V and 30A Peak DC; the average current after start-up transient will be around 5A.Basically I need a two-quadrant power supply, capable of delivering a specific voltage and generate or absorb current from the load, with integrated voltage and current measurement.The available SMUs seem to deliver relatively low power (under 50W) and rather high precision and sensitivity (in the nA region). I don't need such a high spec, 0.5% or 1mA is just fine.Can you recommend any device with such capabilities?Thank you very much in advance.

author: Ice-Tea
author_rank: Super Contributor
timestamp: December 10, 2019, 09:17:43 am
content: Delivering and measuring 1500W is still relatively easy to find.. But sinkingDon't know anything of the top of my head..

author: TurboTom
author_rank: Super Contributor
timestamp: December 10, 2019, 10:13:00 am
content: In your case, especially since your accuracy requirements are quite moderate, a combination of a suitable PSU and an electronic load, operating in constant voltage mode, may be an adequate and much less expensive solution to suit the job. Depending on the tolerance for slight overvoltage of the PSU's output, you may get along even without a decoupling diode. If frequent parameter changes are required, you may want to control the combination my means of a PC so the "Clamping Voltage" of the load is always kept a few tens (or hundreds) of millivolts above the PSU's output voltage.Just my two cents...

author: tszaboo
author_rank: Super Contributor
timestamp: December 10, 2019, 10:27:05 am
content: https://www.heinzinger.com/products/bi-directional-energy-recovery-capable/ers-compact-48-volt-applications/High quality stuff, not cheap. Looks like it is specifically designed for stuff that you want to use it for. The available power is a bit higher than what you need.

author: Someone
author_rank: Super Contributor
timestamp: December 10, 2019, 09:17:59 pm
content: The line is blurring between power sources and SMUs. There are more options if you don't need 4 quadrant sourcing but at higher powers the field thins out. In addition to the example by NANDBlog above (or other brandingshttps://adaptivepower.com/#models):Keysight ranges will also do the task: N6900, N7900, or RP7900Regatron go upwards to larger sizes:https://www.regatron.com/product/overview/

author: JxR
author_rank: Unknown
timestamp: December 11, 2019, 04:00:28 am
content: Quote from: brabus on December 10, 2019, 08:55:51 amAs others are pointing out, you don't need an SMU, nor are there SMUs made with those specifications. All SMU's are precision devices, by design.You most likely need two devices: a high power single quadrant supply, and a high powered electronic load. There are numerous ones made, and many are available used. With your modest precision requirements I would definitely be going for the used market unless there is a specific reason to buy new.

author: Ice-Tea
author_rank: Super Contributor
timestamp: December 11, 2019, 09:05:59 am
content: Delta has onehttps://www.delta-elektronika.nl/en/products/bidirectional-dc-power-supplies-15kw-sm15k-series.html