Patent ID: 9335363
Filing Date: 2016-05-10
CPC Classification: G01R,H02H

Claim Text:
1. A circuit for indicating a broken or missing neutral in a split phase electrical distribution configuration having a first line, a second line, a neutral, and an unbalanced load, the circuit comprising: a voltage divider including an input of a voltage difference between the first line and the second line, and an output, the voltage divider configured to divide the voltage difference and to output the divided voltage difference as a virtual neutral; a rectifier including an input of the virtual neutral, the neutral, and an output, the rectifier configured to rectify a voltage difference between the virtual neutral and the neutral; a determination circuit including an input of the rectified voltage difference, a reference voltage and an output, the determination circuit configured to determine if the neutral is missing or broken based on the rectified voltage difference and the reference voltage; and an indicator circuit configured to indicate when the neutral is missing or broken based on the output of the determination circuit.