| Electronics > Projects, Designs, and Technical Stuff |
| What is "floated" linear voltage regulator? |
| << < (6/13) > >> |
| 001:
--- Quote from: xavier60 on November 21, 2018, 02:55:48 am --- --- Quote from: precaud on November 21, 2018, 02:37:27 am --- --- Quote from: Wolfgang on November 21, 2018, 12:21:58 am ---Floating: LM317: Input-Output-Adjust. This regulator never sees "ground", it floats. --- End quote --- So how does a floating regulator create/have a low impedance to ground if it never references to it? --- End quote --- There will always be a feedback divider to sense the voltage of the - output terminal with respect to the + output terminal. --- End quote --- Thanx! Did You recive my letter about Yours restoration project? |
| Wolfgang:
--- Quote from: xavier60 on November 21, 2018, 02:51:53 am --- --- Quote from: 001 on November 21, 2018, 02:29:21 am --- --- Quote from: Wolfgang on November 21, 2018, 12:21:58 am ---Hi, thats easy. A floating regulator is a regulator which has no direct ground connection. --- End quote --- Thanx Can You comment this eastern europe schematic? --- End quote --- It needs to be mentioned that this design uses the mains switch and transformer's primary winding to discharge the large capacitor. Very hazardous! --- End quote --- This is indeed a floating design. The top part contains an auxiliary PSU centered at the positive output voltage and feeding a two-stage long tailed pair error amp design for voltage and current. The diodes in the top middle define if the PSU is running in CV or CC mode (priority circuit). The string of pass transitors is darlington driven from this voltage. Sensing voltage and current is from the part top right with a Zener diode and resistive dividers. |
| xavier60:
--- Quote from: 001 on November 21, 2018, 03:05:44 am --- --- Quote from: xavier60 on November 21, 2018, 02:55:48 am --- --- Quote from: precaud on November 21, 2018, 02:37:27 am --- --- Quote from: Wolfgang on November 21, 2018, 12:21:58 am ---Floating: LM317: Input-Output-Adjust. This regulator never sees "ground", it floats. --- End quote --- So how does a floating regulator create/have a low impedance to ground if it never references to it? --- End quote --- There will always be a feedback divider to sense the voltage of the - output terminal with respect to the + output terminal. --- End quote --- Thanx! Did You recive my letter about Yours restoration project? --- End quote --- No, I don't understand. I only posted about the bench supply that I made lately which is a floating type. |
| 001:
--- Quote from: xavier60 on November 21, 2018, 03:30:50 am ---o, I don't understand. I only posted about the bench supply that I made lately which is a floating type. --- End quote --- Thanx! Sorry, it`s my mistake. I mean other Xavier :palm: |
| ArthurDent:
"So how does a floating regulator create/have a low impedance to ground if it never references to it?" There is a difference between impedance and resistance. A supply's output could have an extremely high resistance to ground at D.C. but with a capacitor from the output to ground could basically be a short circuit at R.F.. A lot of supplies I have say the output can be floated +/- XXX volts. |
| Navigation |
| Message Index |
| Next page |
| Previous page |