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| I see Two Circuits/What circuit is best? (linear bench PS and know how) |
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| not1xor1:
--- Quote from: 001 on November 12, 2018, 10:15:27 am --- --- Quote from: not1xor1 on November 12, 2018, 08:49:22 am --- two winding transformer with a mosfet as a switch would have been more than enough --- End quote --- Can You post some schematics? --- End quote --- here is a proof of concept with 2 mosfet switches (but it would work with just 1 + a diode though with a bit less efficiency): here are the resulting traces: this might work both for halving the power transistor dissipation and to switch (via an external switch) between half voltage full current mode and full voltage .62 derated current mode. That is if you have a 15+15V 150VA transformer you could use a switch to make your power supply work as 0-15V/0-5A PSU or as 0-30V/0-3A PSU. |
| 001:
WOW :clap: |
| macboy:
--- Quote from: bd139 on November 11, 2018, 02:24:04 pm ---Fair point. I’d clone an E3620A myself. Schematic here: https://www.eevblog.com/forum/testgear/agilent-e3620a-power-supply-no-schematic-available-says-agilent-support/ --- End quote --- +1 The E3620A is fantastic. Super clean, low-noise power. Voltage is very stable from no load to full load, it has no ripple on the output and output noise must be measured in microvolts. Microvolts. It is orders of magnitude cleaner power than anything else on my bench. To top it off, the output is well-behaved upon turning on or off the mains power switch. Many other brands still don't know how to pull off that simple, necessary feat. It's a very good design, worthy of study and imitation. I really like the idea of putting the control sections' internal "ground" reference at the positive output terminal (not the negative one). The output transistor and the current sense shunt are up there on the positive output, so this makes so much sense. The preregulator isn't complicated, it is just a comparator that turns on the TRIAC or doesn't, based on the output voltage, providing one of two voltages to the regulator. It is not a phase-controlled variable output voltage style of preregulator like what is used on some linear high power designs. The preregulator on the V2 side is similar but provides one of four voltages, resulting in lower power dissipation on that side. |
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