Timeline for 14-Volt 6-Amp Power Supply Stability
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
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| Jun 3, 2022 at 9:25 | answer | added | bobflux | timeline score: 3 | |
| Jun 3, 2022 at 8:40 | history | edited | D.A.S. | CC BY-SA 4.0 |
added 663 characters in body
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| Jun 3, 2022 at 8:10 | answer | added | D.A.S. | timeline score: 1 | |
| Jun 3, 2022 at 7:06 | history | edited | D.A.S. | CC BY-SA 4.0 |
added 663 characters in body
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| Jun 3, 2022 at 1:37 | comment | added | Dereck | @Tony Stewart EE75 thank you. I left out Rser on V1 = .4 or just say 20 volts @ +/-10%. Output Voltage = 14 volts as shown, adjustable 10 to 15 via R5/R6 with pot. Tested and works Output Current = 6-amps. Tested and works Current Limit not shown. Have a working model. Line/Load Regulation: 14 VDC @ 0 to 5-Amps = <.1% Model exceeds spec. Ripple and Noise <200 uVpp Load Step Response 0 to 4 to 0-amps: better than +/- 200mv recovering in 10 us. This is the one I am having trouble with. The purpose is a linear DC power supply for 12-volt aircraft, marine, and amateur radio equipment. | |
| Jun 2, 2022 at 20:43 | comment | added | D.A.S. | electronics-notes.com/articles/analogue_circuits/… Since you aren't a newbie.. 2 pages , 2nd on compensation. This only covers basic stuff | |
| Jun 2, 2022 at 20:40 | comment | added | D.A.S. | This design is a boat anchor at best ( serves well at the bottom of a lake ) Please give all specs for noise, start surge , overshoot , step error, load error with specs for tolerances, power , current , load type. | |
| Jun 2, 2022 at 20:36 | comment | added | D.A.S. | You have no tolerance specs for all I/O or step load design specs. Please fix. Right now you depend on your digital lab supply being 20.00V and not +/-10% so the PSRR is odB instead of -60 dB. That's what I mean by being in the wrong place. Step load stability may be designed AFTER you have a square step load specs from A to B Amps in both directions. With no tolerance specs, I offer no solution, but with SPECS anything is possible depending on cost specs for any current. :) | |
| Jun 2, 2022 at 18:42 | comment | added | Dereck | @Tony Stewart EE75 please take another look. I am not measuring the Zener diode current. I am measuring the current in R7, a 1K resistor connected directly across the output. 14 ma = 14 volts. I do not understand your comment about the Zener being in the wrong place. No other place for it to go. The circuit works, just need some compensation somewhere. | |
| Jun 2, 2022 at 18:25 | comment | added | Dereck | @Hearth The boat anchor comment was tongue-n-cheek humor in reference to older equipment like a linear DC power supply with a great big heavy transformer or radios and TV's with tubes. All can be used as boat anchors. | |
| Jun 2, 2022 at 8:34 | comment | added | brhans | @Hearth, I read "ole fashion boat anchor" as a euphemism for "big, heavy", and not necessarily anything to do with a boat. | |
| Jun 2, 2022 at 3:16 | comment | added | Hearth | But why a linear power supply? If it's for a boat, there's so much noise there anyway that one switching regulator, especially if you run it in forced-continuous mode, won't make a difference. | |
| Jun 2, 2022 at 2:31 | comment | added | D.A.S. | Always start with expectations for all variables: Vin range, Voutput range error. { also min/maxLoad & load reg error Dc and step) your zener is in the wrong place and you are measuring zener current not as a stable voltage. Define Vo/Io=Zo ... / load = load regulation error (%) . Add 500 ohm + C in series across R5 for Kd gain with RC to match load rise time or slightly slower eg 10us , C= 10u/500=20nF. Add current sensing for better prediction of boost. Otherwise, the control gain is asymmetrical and many other issues. | |
| Jun 2, 2022 at 2:07 | comment | added | Dereck | @Hearth thx for the comment. I want to design an ole fashion boat anchor linear power supply with updated circuitry.. I do not ant a switcher and the noise associated with them. Technically this is an LDO linear design. In practice, V1 is replaced with 17-volt AC transformer, rectifiers, and a massive filter capacitor. Designed to replace voltage regulators in Astron and other like 12-volt DC high current power supplies ham radio operators use. | |
| Jun 2, 2022 at 1:46 | comment | added | Hearth | Why not use a proper switching regulator chip, instead of trying to make your own? | |
| S Jun 2, 2022 at 1:31 | review | First questions | |||
| Jun 2, 2022 at 4:57 | |||||
| S Jun 2, 2022 at 1:31 | history | asked | Dereck | CC BY-SA 4.0 |