Start pulse rejection for a motor commutation pulse detection circuit
US6380757B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Jun 5, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Improved motor position detection circuitry based on commutation pulse counting, including a pulse recognition circuit, a pulse counting circuit, and a start pulse rejection circuit for rendering the position detection circuitry insensitive to start-up pulses associated with motor turn-on. The start pulse rejection circuit detects an off-to-on transition of a motor controller, and renders the position detection circuitry insensitive to start-up pulses generated in a predefined time window coinciding with the detected off-to-on transition. In a first mechanization, the start pulse rejection circuit maintains a nominal bias voltage at an input of the pulse recognition circuit for the duration of the predefined time window. In a second mechanization, the start pulse rejection circuit renders the pulse counting circuit insensitive to pulses produced by the pulse recognition circuit for the duration of the predefined time window.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.