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AC Power Meter | PSU | UPS evaluation | Battery Testers - Chargers | CCTV => AC Power Measurement of appliances & Technical discussion => Topic started by: Kiriakos GR on October 03, 2024, 03:08:54 PM
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This topic comes to answer the question, of what is more modern home appliance with lowest consumption as load for a Digital power meter analyzer.
All answers comes from the market of mobile phone charger, Gallium nitride (GaN), and this is know since the year 2022.
45W USB-PD Type-C reference design = Low no-load standby input power < 30 mW
65W USB-PD Type-C reference design = Low no-load standby input power < 65 mW
And also another modern concept in on the way, Low no-load standby input power ZERO Watt.
In theory this is possible, when the charger (PSU), this can detect that nothing is plugged at it output.
About a year ago, Seasonic gave to me as a gift, one 65W USB-PD Type-C charger PSU.
Product model: C650NXXAFC-EU
UP/N W065RP23P
Non of these codes are known to search engines, and I cannot find any no-load standby input power specifications.
Today I did challenge the most sensitive Plug-in power meter in my lab.
And this measured:
238 V
10 mA
PF 0.040
0.07 Watt ( 70 mW) ;)
Seasonic C650NXXAFC-EU
weight 90 grams
Dimensions 31x31x61.78mm
XIOMI BHR4499GL similar charger, this is not identical, its similar but this has 0.3W no-load standby input power specifications.
(Infineon Technologies is the one whom developed 65W USB-PD Type-C reference design = Low no-load standby input power < 65 mW)
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Today I am somewhat in tears. :P ( approximately 15 Euros loss )
I did succeed destroying two of these damn expensive 1000V - 440mA HRC fuse's within 10 minutes.
I was after a procession current measurement by using my best HH multimeter, at this 65W GAN USB-C charger.
The problem was that I could not foreseen and or predict, the unseen enemy, and this is pulsing PSU Inrush current.
I did connect the load at mA range of my DMM, and upon power up, the DMM was not measuring anything.
I thought that the fuse it might was burned from older accident, and replaced it with a new.
And it was burned again ....
Over the past 12 years, I have never thought that DMM mA input this is in danger due pulsing PSU Inrush current
The solution this is a DIY special harness that will include a power switch, this acting as sort-circuit between DMM current input terminals.
Yes, you never make such a though, prior dealing with the specific application which turned in to a challenge.
Now I have to go at the drawing board, and to find out of how to design such a gadget ..
Inrush current protector for DMM inputs.
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Blow HRC Fuses, this is a known pain :-X
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USB-C PD = Power Delivery
Every day something new to learn. :)
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Few days ago, I did invite EatonCare - Bussmann series solutions and one of their Engineers to have a look of this topic.
Gallium nitride (GaN) semiconductors these has much different operation characteristics, and Bussmann DMM Fuses these has been designed at 2001.
According my way of thinking, Bussmann DMM 440mA Fuses they need a REDESIGN.
It might be required, them to slow down a bit, as their currently in use of Fast Acting (consistency of metals), this driving them to premature destruction.
And consumers are called to bare all the financial expenses of all such unjustified incidents. :-X
I would also expect, DMM manufacturing brands, them to pay a greater attention about their choices of HRC fuses.
DMM manufacturing brands, they should add warning notes, at the product user manual, regarding best practices of measurements of AC/DC current at Gallium nitride (GaN) semiconductors.