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HI. Where do you need to measure this current? on the output side of opto? Do you need to go thru isolation barier with your current reading. Block diagram or partial schematic will help. If your DSP is on the "input side" of opto, and you need to measure current on "output side" of opto - this...

this is BS. Adding gear box is one thing, motor interia is another. For fast servo - never do this (add interia). For spinning with one dirrection and with one speed - yes , adding interia makes system smoother. It also minimizes torque ripple cause by commutation in 6-step drives. Stability -...

Can you use HALL? Yes, for 50A range I used resistor as sensor. But for 400A (yes, for SPACE!!!) I used good, Europe made Halls. (Just need to BS with customer for approval....) and with Hall you you can put sensor any place, on high 140V cable without any isolation optos (7800 or similar)...

Hello. TTL counter is the simplest way to go. Or just do PLD if you know how to program. Yes, "dead" time is very important. From TTL to 10V FET gate - use any low side FET driver from IXYS or Micrel. Do not use IXYS "4 series"!!!! They have "5" now - improved. Depending how big is your FET -...

Vicor - you may have problems with EMI.... Plus - if you connect few Vicors - they just explode (sometimes, not always) during on/off. (I think because too much PHDing inside). 10 switchers - wow! Must be very hi-tek project. I'll go for sequencing... thx

Hello. isolated..... Can do 2 stages: 1st stage 1:2 transformer connected to H-bridge (with 4 power N-FETs) producing double ouput voltage. Can easy run with 500kHz, open loop (add few hundred mV for diodes drop). Output will be 10 to 32V. (check IR chips with oscilator inside and bootstrap for...

Hello. C23 and C25 - can be easy 10 or 100 time larger. Thermistor response time is in 100mseconds range, no sense to use low pass filtering with KHz range (10nF, and 6kohms). Second problem - signal should be measured by instrumentation amp (High common mode rejection), with 2 wires. This...

Hello. Looking at photos - bad prototype. This EL7158 driver chip has rise/fall time in 10ns range. Piece of wire =10nH for every inch, so few inches of thin wire may give you 50nH inductance. Few Amps (say 5A), and 50nH, and 10nseconds will give you lots of ringing (now I'm too lazy to...