A while back I posted an incomplete idea for a current monitor circuit that output a voltage proportional to the current being monitored. Thanks to some help I have a working model of that. The next step is to add an adjustable voltage comparator on the output of that and a latch.
Originally the idea was to have the latch kill V Ref on an LM723 or LM317 accomplishing an electronic circuit breaker. The losses were too great with either of those methods. What I need is a very low loss switch.
In this design current is small, around 250 mA and voltage is limited to 5 Volts. I would like to keep loss across the switch below 100 mV,
The schematic attached includes the current monitor.
Voltage comparator? Maybe LM311 or LM393. I have those on hand. The latch? CD4027, or such.
The switch? ??? there I need ideas.
Originally the idea was to have the latch kill V Ref on an LM723 or LM317 accomplishing an electronic circuit breaker. The losses were too great with either of those methods. What I need is a very low loss switch.
In this design current is small, around 250 mA and voltage is limited to 5 Volts. I would like to keep loss across the switch below 100 mV,
The schematic attached includes the current monitor.
Voltage comparator? Maybe LM311 or LM393. I have those on hand. The latch? CD4027, or such.
The switch? ??? there I need ideas.
Attachments
-
53.3 KB Views: 8