Integrated earth leakage current detector and breaker circuit
US11143713B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 19, 2020 |
| Grant date | Oct 12, 2021 |
| Priority date | — |
| Expiry date | Jun 5, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/337
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A semiconductor integrated circuit for leak current detection which outputs an interruption signal to cut off electrical power supplied by a power supply to an electric line if a leakage current occurs including a leakage current processing unit and an output unit configured to output the interruption signal. The leakage current processing unit includes: a zero-power supply voltage detector; a counter when the power supply voltage pulse signal is input; a zero-input induction voltage detector configured to output a leakage current pulse signal whenever the input induction voltage becomes 0 V; a counter latch configured to latch a count value supplied by the counter and output the latched count value; an output induction voltage setting unit configured to calculate an output induction voltage; and a comparator configured to compare the output induction voltage with a predetermined trip level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.