Zero crossing detector and method of determining a zero crossing point
US6634240B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1999 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Aug 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/1536
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A zero crossing detector has an analyzer which determines a zero level crossing of a currently input electrical pulse packet and which emits a trigger signal indicative of a determination having been made, and a pre-trigger unit which monitors variations in the amplitude of the current input pulse packet to detect a crossing of a pre-trigger level. The detector further includes a control unit operably connected to the pre-trigger unit which compares the amplitude of the pre-trigger level with any amplitude of a signal derived from the current or a previous input electrical pulse packet, and which automatically controls the amplitude of the pre-trigger level to maintain a working difference therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.