Patent ID: 8258738
Filing Date: 2012-09-04
Classification: H02P

Abstract:
1. Apparatus for controlling the start winding of an AC motor having a main winding and a start winding connected in parallel, power lines including a neutral connected to the windings and adapted to be connected to an AC power supply, comprising a triac having first and second main terminals and a gate terminal and a positive temperature coefficient (PTC) resistor connected in series with one main terminal and adapted for connection with the start winding, a current responsive reed switch having first and second terminals and a capacitor, one terminal of the reed switch being connected intermediate to the PTC resistor and the triac and the capacitor connected in series with the second terminal of the reed switch, the triac gate terminal connected to a location intermediate the reed switch and the capacitor and a bias resistor connected between the other triac main terminal and neutral and a sensing coil closely disposed to the reed switch and adapted for connection to the main winding.