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Mains voltage zero crossing detector with optical isolated output - Drive_R_S_Flop.pdf
Attached is what I had in mind using opto-couplers to set and reset a
simple flip-flop. The advantage is that the 100K load on the opto-coupler is slow in the _rising_ direction, but falls fast, thus doesn't impair performance. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#2
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Mains voltage zero crossing detector with optical isolated output- Drive_R_S_Flop.pdf
Jim Thompson a écrit :
Attached is what I had in mind using opto-couplers to set and reset a simple flip-flop. The advantage is that the 100K load on the opto-coupler is slow in the _rising_ direction, but falls fast, thus doesn't impair performance. ...Jim Thompson What about that 100us delay at the falling edge ;-) -- Thanks, Fred. |
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Mains voltage zero crossing detector with optical isolated output - Drive_R_S_Flop.pdf
On Fri, 24 Feb 2012 01:18:02 +0100, Fred Bartoli " " wrote:
Jim Thompson a écrit : Attached is what I had in mind using opto-couplers to set and reset a simple flip-flop. The advantage is that the 100K load on the opto-coupler is slow in the _rising_ direction, but falls fast, thus doesn't impair performance. ...Jim Thompson What about that 100us delay at the falling edge ;-) 111us ;-) It should be symmetric. I suspect it's just a simulation runtime issue until the "lead" capacitor reaches equilibrium, since, without the capacitor, it's symmetric at 278us delay on both edges. (I "tuned" to the first edge... something I would not normally do, as it's not good engineering practice.) My multi-component version, which thoroughly "whacks" the opto-coupler at the zero-crossing, does ~2us on both edges, come hell or high water, but it offended his majesty.... so he's off sucking his thumb in the corner trying to think of other phrases of denigration besides "hag" and "geezer" :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#4
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Mains voltage zero crossing detector with optical isolated output - Drive_R_S_Flop.pdf
On Thu, 23 Feb 2012 17:32:58 -0700, Jim Thompson
wrote: On Fri, 24 Feb 2012 01:18:02 +0100, Fred Bartoli " " wrote: Jim Thompson a écrit : Attached is what I had in mind using opto-couplers to set and reset a simple flip-flop. The advantage is that the 100K load on the opto-coupler is slow in the _rising_ direction, but falls fast, thus doesn't impair performance. ...Jim Thompson What about that 100us delay at the falling edge ;-) 111us ;-) It should be symmetric. I suspect it's just a simulation runtime issue until the "lead" capacitor reaches equilibrium, since, without the capacitor, it's symmetric at 278us delay on both edges. (I "tuned" to the first edge... something I would not normally do, as it's not good engineering practice.) My multi-component version, which thoroughly "whacks" the opto-coupler at the zero-crossing, does ~2us on both edges, come hell or high water, but it offended his majesty.... so he's off sucking his thumb in the corner trying to think of other phrases of denigration besides "hag" and "geezer" :-) ...Jim Thompson You _can_ make an R-S flip-flop from the raw opto-coupler NPN's. But, taking output from one side, it's so gross it looks like a Larkin creation. Might clean it up with some logic that looks at both collectors, but why bother. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
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