element14 Community
element14 Community
    Register Log In
  • Site
  • Search
  • Log In Register
  • Members
    Members
    • Achievement Levels
    • Benefits of Membership
    • Feedback and Support
    • Members Area
    • Personal Blogs
    • What's New on element14
  • Learn
    Learn
    • eBooks
    • Learning Center
    • Learning Groups
    • STEM Academy
    • Webinars, Training and Events
  • Technologies
    Technologies
    • 3D Printing
    • Experts & Guidance
    • FPGA
    • Industrial Automation
    • Internet of Things
    • Power & Energy
    • Sensors
    • Technology Groups
  • Challenges & Projects
    Challenges & Projects
    • Arduino Projects
    • Design Challenges
    • element14 presents
    • Project14
    • Project Groups
    • Raspberry Pi Projects
  • Products
    Products
    • Arduino
    • Avnet Boards Community
    • Dev Tools
    • Manufacturers
    • Product Groups
    • Raspberry Pi
    • RoadTests & Reviews
  • Store
    Store
    • Visit Your Store
    • Or choose another store...
      • Europe
      •  Austria (German)
      •  Belgium (Dutch, French)
      •  Bulgaria (Bulgarian)
      •  Czech Republic (Czech)
      •  Denmark (Danish)
      •  Estonia (Estonian)
      •  Finland (Finnish)
      •  France (French)
      •  Germany (German)
      •  Hungary (Hungarian)
      •  Ireland
      •  Israel
      •  Italy (Italian)
      •  Latvia (Latvian)
      •  
      •  Lithuania (Lithuanian)
      •  Netherlands (Dutch)
      •  Norway (Norwegian)
      •  Poland (Polish)
      •  Portugal (Portuguese)
      •  Romania (Romanian)
      •  Russia (Russian)
      •  Slovakia (Slovak)
      •  Slovenia (Slovenian)
      •  Spain (Spanish)
      •  Sweden (Swedish)
      •  Switzerland(German, French)
      •  Turkey (Turkish)
      •  United Kingdom
      • Asia Pacific
      •  Australia
      •  China
      •  Hong Kong
      •  India
      •  Korea (Korean)
      •  Malaysia
      •  New Zealand
      •  Philippines
      •  Singapore
      •  Taiwan
      •  Thailand (Thai)
      • Americas
      •  Brazil (Portuguese)
      •  Canada
      •  Mexico (Spanish)
      •  United States
      Can't find the country/region you're looking for? Visit our export site or find a local distributor.
  • Translate
  • Profile
RoadTests & Reviews
  • Products
  • More
RoadTests & Reviews
Blog Part 4: Time Response Testing
  • Blog
  • RoadTest Forum
  • Documents
  • RoadTests
  • Reviews
  • Polls
  • Files
  • Members
  • Mentions
  • Sub-Groups
  • Tags
  • More
  • Cancel
  • New
RoadTests & Reviews requires membership for participation - click to join
  • Subscribe by email
  • More
  • Cancel
  • Share
  • Subscribe by email
  • More
  • Cancel
  • Author Author: waleedelmughrabi
  • Date Created: 7 Jan 2021 1:56 PM Date Created
  • Views 425 views
  • Likes 1 like
  • Comments 0 comments
Related
Recommended
  • desktop power supply
  • r&s
  • r&s®ngp800
  • power supplies

Part 4: Time Response Testing

waleedelmughrabi
waleedelmughrabi
7 Jan 2021

Part 4 of R&S NGP814 Power Supply - Review

 

This part of the review focuses on transient behaviour, the Rigol DL3021 electronic load is used to generate the various load conditions used in the experiments.

The table below is from the NGP814 datasheet, the T90 rise time value is below 10ms.

 

image

 

To get a feel of the rise time over the rated power range the following tests were done using Channel 1 at various percentages of the rated power (200W).

[Note: all measurements were taken at 1M samples/Sec and a 16bit ADC]

 

All the tests were generated using CSV files that were then uploaded to the device as seen in the photo below:

image

 

1. Voltage time response

 

Test A @P = 90%
  • P = 180w
  • V = 32V
  • I = 5.625A
  • Tcycle = 4 seconds

image

image

Trise = 0.003826 = 3.826 mSec

Tfall = 2.419527 - 2.41781 = 1.717 mSec

 

 

Test B @P = 50%

  • P = 100w
  • V = 32V
  • I = 3.125A
  • Tcycle = 4 seconds

image

 

image

Trise = 3.994 mSec

Tfall = 2.915 mSec

 

Test C @P = 1%
  • P = 2w
  • V = 3.2V
  • I = 0.625A
  • Tcycle = 4 seconds

image

T(rise) = 0.497 mSec

T(fall) = 0.213 mSec

 

 

Test D No Load
  • P = 100w
  • V = 16V
  • Tcycle = 4 seconds

image

Zoom in is shown below:

image

 

Trise = 1.852 mSec

Tfall = 037.65 mSec

 

2. Current time response

 

Test E @P = 6.4%
  • P = 12.8w
  • V = 32V
  • I = 0.4A
  • Tcycle = 4 seconds

 

image

Zoom in is shown below:

image

Trise = 0.02 mSec

Tfall = 0.075 mSec

 

 

Test F @P = 32%
  • P = 64w
  • V = 32V
  • I = 2A
  • Tcycle = 4 seconds

image

 

Trise = 0.165 mSec

Tfall = 0.073 mSec

Overshoot = 0.524 A

 

 

Observations:

  • Rise time is proportional with amplitude.
  • Total power delivered does not affect rise time (i.e. for the same voltage rise time is roughly the same even if current value changes and vice versa).
  • Test D proves the extended fall time documented in the datasheet at No Load condition, the results still fall within "<50 mSec", the changes in fall rate can be seen circled in yellow, this could be due to reactive components discharge response charts.
  • Very high current PO is shown in Test E, load was constant resistive load. However, I noticed that at higher currents the PO decreases. This needs further investigation to void damaging sensitive components when powered by the power supply. (When I tested at 2.5A the overshoot burned the fuse of the DMM6500 input, the fuse is rated at 3A, 250V, 235 series, fast acting).
  • The same behaviour was observed whether the current value changes were set by the NGP814 or by the load by changing the resistance. (tested with an electronic load with a slewrate of 0.25A/usec, and by simply flicking a mechanical switch between resistors).

 

Notes:

  • These tests do not cover all cases, but aim to show certain selected scenarios and traits.
  • Accuracy is limited by sampling rate, and ADC (quantization, bit rate and noise).
  • Results will need to be verified again using higher sampling rate oscilloscope, will update in the near future.

 

Overall time response of the NGP814 exceeds expectations and well within the range documented in the datasheet "<10ms" (highest measured was around 4ms).

Only concern is the percentage overshoot of the current level.

  • Sign in to reply
element14 Community

element14 is the first online community specifically for engineers. Connect with your peers and get expert answers to your questions.

  • Members
  • Learn
  • Technologies
  • Challenges & Projects
  • Products
  • Store
  • About Us
  • Feedback & Support
  • FAQs
  • Terms of Use
  • Privacy Policy
  • Legal and Copyright Notices
  • Sitemap
  • Cookies

An Avnet Company © 2023 Premier Farnell Limited. All Rights Reserved.

Premier Farnell Ltd, registered in England and Wales (no 00876412), registered office: Farnell House, Forge Lane, Leeds LS12 2NE.

ICP 备案号 10220084.

Follow element14

  • X
  • Facebook
  • linkedin
  • YouTube