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Engineering
Electrical Engineering
Understanding operation of specific SMPS example (is it a flyback?)
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[QUOTE="tim9000, post: 5481906, member: 480143"] I don't have much spear time at the moment, but I came across a SMPS diagram in this thread: [URL]https://www.physicsforums.com/threads/quick-question-about-inverter-tx-order-wrt-mains.870309/[/URL] And I was trying to figure it out, and I don't want to forget about it before I do. So I was wondering if anyone had any thoughts on it's operation: See Image> [PLAIN]http://www.computeraudiophile.com/attachments/f8-general-forum/4738d1363502150-power-quality-audio-systems-power-supplies-better-smps-schematic.png[/PLAIN] -So if there was zero volts across the output conductor no light would be emitted from the optocoupler, then what would the IC do? (stop pulsing? Like it only pulses when there is an error voltage, like a hysteresis control?) Also, could you please elaborate on that little circuit, like what that zener diode is for, and the resistors and C205? -So are C102 and LF101 specific to be at a resonant frequency LC circuit? -So the top TX gets full rectified line voltage, but I'm a bit unclear on the feeding of the bottom TX (via the voltage division of SYNC?)? ...so the bottom supplied by pins 4 and 5? Isn't that the primary of the bottom of TX? So how much is SYNC? I assume it's in phase with something? So how does the feedback pin work? What does shorting the pin via the opto or having a voltage across C105 make the IC do? I looked up the IC. There's a block diagram for the converter here: [URL]https://www.fairchildsemi.com/datasheets/FS/FSQ0565RQ.pdf[/URL] "Sync: This pin is internally connected to the sync-detect comparator for quasi-resonant switch- ing. In normal quasi-resonant operation, the threshold of the sync comparator is 1.2V/1." But I'm not really sure how it operates.Thanks in advance [/QUOTE]
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Understanding operation of specific SMPS example (is it a flyback?)
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