Patent Number: 8,817,431

Title: System and integrated method for a parallel and series arc fault circuit interrupter

Abstract: To prevent property fires, electrical circuits need to be protected from arc faults due to line-to-line, line-to-neutral and line-to-ground conductivity, known as high current parallel arcing, and protected from arc faults occurring along line-to-line, line-to-load, load-to-load, load-to-neutral and neutral-to-neutral conductor configurations, known as low current series arcing. Devices that protect electrical circuits from these arc faults is known as a combination-type arc fault circuit interrupter (AFCI). Unlike prior art AFCI designs that meet the UL 1699 standard requirement for series arc fault detection down to 5 amps, the present AFCI invention employs a bi-directional Hall-effect current sensor (HECS) integrated circuit, a HECS measurement phase shift correction circuit, and a microprocessor with an integrated method to detect high current parallel arcing and low current series arcing, while also mitigating false arcing circuit detections and interruptions due to normal arcing electric motor-driven appliances like ceiling fans.

Inventors: Tomimbang; Wendell E (Kissimmee, FL), Muravez; Randall J (Orlando, FL)

Assignee: True-Safe Technologies, Inc.

International Classification: H02H 9/08 (20060101)

Expiration Date: 8/26/12018