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with capacitor in starting winding the phase angle between running and starting winding improves which compensates reduced staring winding current. so net result no reduction in starting torque.
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Normally our Home Refrigerator Motors are Resistive start and induction run type which draws heavy current during starting cause to trip inverter. So by converting that motor to Capacitive start induction run motor the starting current can be reduced and it will run on home inverter. For that we...
Remember the power supply for high side is derived from low side supply by instantly charging the capacitor connected between Vs and Vb pin via diode when low side MOSFET is on.
So the high and low side should switch alternatively to maintain sufficient charge in capacitor.
The capacitor 100nf...
Auxiliary winding for 18V on main transformer seems to be theoretically best choice. But in practical situation the regulation in auxiliary winding will be very poor. Under no load conditions even it may not able to supply minimum current drawn by TLP250 drivers.
If you use 7818 then there will be no isolation between battery ground and 325V dc which is swinging from 0v and -325v.
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