Device for controlling controlled variable by on/off switching operations with less noise manner
US7589432B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 3, 2006 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Sep 5, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60L50/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A switching device comprises a switching element, a setting member, and a control member. The switching element turns on/off in response to a drive signal, so as to control a controlled variable of a controlled system to a desired amount. The setting member sets the drive signal on the basis of both a desired duty to control the controlled variable, wherein the drive signal is set by repeating a basic pattern consisting of a plurality of intervals which are decided to remove overlaps, in a frequency spectrum, between or among switching frequencies produced based on an interval between start timings of the on operations and an interval between start timings of the off operations. The control member variably controls the switching element based on the drive signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.