GROUND FAULT CIRCUIT INTERRUPT DEVICE
First Claim
Patent Images
1. A GFCI device, comprising:
- a current transformer engaged with at least one power line and a neutral line;
a ground fault logic component communicating with the current transformer for generating a signal to cause a circuit between an electrical load and a power supply connected to the power line to open based on a ground fault signal input from the transformer; and
at least one microcontroller communicating with the ground fault logic component and;
causing a circuit between the power supply and electrical load to open when at least one voltage in the device exceeds a maximum voltage threshold due to the neutral line being broken or due to a power line being connected to a neutral line terminal and vice-versa, and/or the microcontroller also causing the circuit between the power supply and electrical load to open when at least one voltage in the device falls below a minimum voltage threshold due to a neutral line being broken; and
causing a circuit between the power supply and electrical load to open when an end of life (EOL) condition is detected.
1 Assignment
0 Petitions
Accused Products
Abstract
A GFCI circuit for a 120/240 volt application employs a microcontroller to trip the circuit when voltage is too high or too low, in addition to tripping the circuit on a ground fault as indicated by a ground fault logic component. The microcontroller also permanently prevents circuit operation if an EOL condition is sensed, such as the failure of the power relay to trip during test or failure of the ground fault logic component to signal a ground fault during test.
12 Citations
20 Claims
-
1. A GFCI device, comprising:
-
a current transformer engaged with at least one power line and a neutral line;
a ground fault logic component communicating with the current transformer for generating a signal to cause a circuit between an electrical load and a power supply connected to the power line to open based on a ground fault signal input from the transformer; and
at least one microcontroller communicating with the ground fault logic component and;
causing a circuit between the power supply and electrical load to open when at least one voltage in the device exceeds a maximum voltage threshold due to the neutral line being broken or due to a power line being connected to a neutral line terminal and vice-versa, and/or the microcontroller also causing the circuit between the power supply and electrical load to open when at least one voltage in the device falls below a minimum voltage threshold due to a neutral line being broken; and
causing a circuit between the power supply and electrical load to open when an end of life (EOL) condition is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A 120/240 volt junction box, comprising:
-
a first 120 volt line connected to a first GFCI device for powering at least a first load except under ground fault conditions, in which case the first GFCI device opens a circuit between the first 120 volt line and the first load;
a second 120 volt line connected to a second GFCI device for powering at least a second load except under ground fault conditions, in which case the second GFCI device opens a circuit between the second 120 volt line and the second load;
a neutral line connected to both devices;
first means in the first GFCI device for preventing malfunctioning of the first GFCI device in the presence of a ground fault if the neutral line is broken and for preventing malfunctioning of the first GFCI device in the presence of a ground fault if the neutral line is reversed with one of the 120 volt lines;
second means in the second GFCI device for preventing malfunctioning of the second GFCI device in the presence of a ground fault if the neutral line is broken and for preventing malfunctioning of the second GFCI device in the presence of a ground fault if the neutral line is reversed with one of the 120 volt lines;
third means in the first GFCI device for preventing operation of the first GFCI device in the presence of an end of life (EOL) condition; and
fourth means in the second GFCI device for preventing operation of the second GFCI device in the presence of an end of life (EOL) condition. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A GFCI device, comprising:
-
a ground fault logic component outputting a signal representative of whether a ground fault exists; and
a microcontroller connected to the ground fault logic component and opening a circuit between the power line and a load when a ground fault exists, when a wiring fault exists, when an end of life (EOL) condition exists. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification