Patent Number: 8,575,881

Title: Current injection circuit for delaying the full operation of a power factor control circuit for AC induction motors

Abstract: An energy saver delay circuit for an induction motor is disclosed. The energy saver delay circuit includes a power factor control circuit including an integrator, the integrator having a negative summing junction and a current injection circuit electrically connected to the negative summing junction, the current injection circuit configured for injecting an offset current into the negative summing junction to cause about the maximum available voltage from a power source to be supplied to the motor for a predetermined amount of time. Current injection may be triggered by voltage being applied to the motor, wherein the voltage exceeds a predetermined value. Alternatively, current injection may be triggered by current flowing through the motor, responsive to the current exceeding a predetermined threshold current. Alternatively, current injection may be triggered by voltage across the power factor control circuit, responsive to the voltage exceeding a predetermined threshold voltage.

Inventors: Hiltbold; Gordon E. (Woodland Park, NJ)

Assignee: Energy Innovative Products, Inc.

International Classification: H02P 1/42 (20060101); G05F 1/70 (20060101)

Expiration Date: 1/05/12017