Apparatus and method for detecting phase state
US6975490B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2003 |
| Grant date | Dec 13, 2005 |
| Priority date | — |
| Expiry date | Apr 30, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/09
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
In an apparatus and a method for detecting a phase state capable of improving reliability of an air conditioner by preventing an abnormal operation of the air conditioner by detecting a phase state (antiphase and open-phase) of three phase AC power supplied to the air conditioner and displaying the detected phase state, the apparatus includes a phase detector for detecting first, second and third phases of a three phase current; an interrupt detector for detecting a falling edge of a pulse signal corresponded to the third phase of the detected first, second and third phases, recognizing an interrupt occurrence by the third phase when the falling edge is detected and generating a counting signal; a counter for counting a pulse signal corresponded to the first and second phases on the basis of the interrupt occurred-third phase according to the counting signal; an antiphase/open-phase detector for detecting a state as a normal connection state, an antiphase state on the basis of a pulse signal corresponded to the first or second phase counted by the counter and detecting an open-phase state on the basis of the interrupt counting times; and a display unit for displaying a message indi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.