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Isolated DC-DC converter normally have their outputs and inputs galnacically isolated through (transformer and/or opto isolators) example of isolated converters: flyback, forward push-pull etc.., non isolated have their outputs and inputs use the same reference, example buck, boost, linear...
A non intrusive idea is to use a cheap fiberoptics cable. Place one end in proximity of lamp to pick up the light (away from the heat), and use a photodetector to monitor it on the other end!
If you add couple resistors: a low (sub) ohm resistor R1 between a voltage sources and Q4 S, which may be used to measure current from the source and another one (~100ohm) from the same source to Q3 S.
These component will help in the analysis, and you'll see the current through R1 is...
isolation circuits patient
Flatulent's way is the simplest, I just like to expand on it a little and suggest you use a serial ADC to keep the opto isolators count to a minimum, and a low power isolated DC-DC converter. there are many vendors for this part with a different power and isolation...
Minimum layers cam is normally calculated based on signal routing needs plus dedicated ground and power layers. You can split the ground plane layer into analog and digital ground sections and connect them at the ADC or DAC. Take precaution so the analog ground is not routed under any digital...
uc3842 spice
UC3842 Model is similar to LT1242 from Linear Tech, I recommend you use switcherCADIII for simulation. It has a spice model for LT1242 and other supporting parts.
SwitcherCADIII is free from www.linear-tech.com
There are lot of solutions out there if you prefer to do it youself.
Check: http://www.powerint.com they offer one of the simplest complete solution.
Other companies offring the same thing: Fairchid, onsemi, and ST.
Re: AC load switching
Try MOC3032 from fairchild, it's an opto + zero crossing detector + Triac driver,
www.fairchildsemi.com/pf/MO/MOC3032-M.html
sonic
Re: 24V 80A SMPS supply.
That't not a project for the novice. If you insist however, I recommend the mag amp topology, it is used by most power supplies of similar power ratings. You may need to implement an active power factor correction and an adequate EMI filter.
Sonic
Re: High Voltage Amplifier
If a pure sine wave output is not required, a push-pull amplifier with VCC around 24V and a transformer with the proper turns ratio for high voltage will do the job.
S
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