EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: ali6x944 on March 10, 2016, 04:05:45 am
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Hi everyone,
Is it possible to make Voltage controlled multiplexer for a switch mode pawer supply to chose its operating trepology?
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Hi! Basically, it seems possibly, but in most cases it's better to use one proper topology, that serves all the needs.
To give better answer there's more info needed. Between which topologies would you like to switch? Which IC do you use?
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Make a resistor string, the input is some reference voltage, like a TL431, divide it down to the with the correct voltage values. Use these voltages with a bunch of comparators. Route the output of the comparator to some logic ICs, and then the output of those to a bunch of analog multiplexer or switch.
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Th OP wants to change the topology of the smps, not the voltage. If I remember correctly the high current paths needs to be rearranged for different topologies, and that can't be done with an analog mux, but rather nice fets or realys. But that would probably mess up any nice low-inductance routing on the pcb and cause a low efficiency.
I guess it would probably be easier to build the different topology-smps modules separately and then just switch between the output DC from the modules....
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This type of question is exactly why my sig is what it is ...