| General > General Technical Chat |
| "Giving away secrets" of electronics? |
| << < (17/18) > >> |
| Kean:
--- Quote from: Geoff-AU on November 22, 2022, 12:13:48 pm ---What’s a hard switched converter? Is it about 2 minutes longer than a soft switched converter? --- End quote --- LOL, I'm slow. I only just got this yolk.. I mean joke. |
| PlainName:
--- Quote from: EPAIII on November 27, 2022, 08:58:08 am ---Actually he said, "I have been fixing up a bog standard couple of hard switched converters for a customer." A bog is an area of soft, wet ground. Hard switched? Does it use a knife switch? Or a toggle switch? Or is it a switch like my dad used when I got caught at something? --- End quote --- I realise you might be taking the piss, but just in case you haven't come across this colloquial phrase before, bog standard means basic and ordinary (without frills). And, I presume he meant 'hard switched' as in switched due to circuit condition (for instance, some threshold being reached tripping the switching device) as opposed to 'soft switched' which would mean being controlled by software. Tre Farringdon can be a dork at times, but this sounds like a perfectly reasonable 20k foot view of whatever it is. |
| tom66:
Hard switched vs soft switched refers to the rate at which the power switch is turned on, nothing to do with software. A hard switched converter uses as much gate current as possible to get the channel of the FET or whatever device to switch on as quickly as possible, reducing dynamic losses. A soft switched converter switches these power switches more slowly. This is typically combined with a converter topology that can enter ZVS/ZCS modes where the voltage or current across or through the switch at the moment of transition is minimal; these designs can then tolerate soft switching without excessive power dissipation in the FET/IGBT. A 'bog standard' hard switched converter is likely a lower power SMPS with hard switching of the FET, in an environment that either tolerates higher EMI but demands lower cost. A good example would be something like a simple 30W 12V mains power wall wart. Much above 100W the EMC considerations make topologies like this increasingly unaffordable and so you find ZVS/ZCS designs becoming dominant. I have however encountered an LCD TV with a 200W flyback converter for the backlight 24V supply, with a four-stage EMI filter and an additional external filter at the IEC connector. Me thinks the SMPS designer was a bit new there. |
| PlainName:
See, not hard to figure out what he meant :) Unless my suggestion was accurate :( |
| Zero999:
--- Quote from: tggzzz on November 26, 2022, 11:18:36 pm --- --- Quote from: jpanhalt on November 26, 2022, 10:07:42 pm --- --- Quote from: tggzzz on November 23, 2022, 11:58:06 pm ---I'm disappointed. treez/faringdon hasn't "thanked" my posts. Whatever is the world coming to?! --- End quote --- Hey, lick your wounds. I got a "like" here: https://www.eevblog.com/forum/renewable-energy/whats-wrong-with-smd-fets-on-pcb-lying-on-top-of-metal-plateheatsink/msg4546229/#msg4546229 --- End quote --- Oh, I'm revelling in it :) Thanking everybody cheapens any value there might be in saying thanks. --- End quote --- He hasn't thanked a single post in this thread, which is highly unusual. Perhaps he's not checked it? His profile says he's been logged on today, which is odd. |
| Navigation |
| Message Index |
| Next page |
| Previous page |