Control device
US7170270B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 2004 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | May 8, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/0822
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a control device for operating a load circuit provided with an inductive load, comprising a control stage producing a pulse-width modulated control signal with measuring disconnection intervals provided in between said control signal, a power stage feeding the load circuit and comprising an electronic switch controlled by the pulse-width modulated control signal and a freewheeling element which is connected in parallel to said load circuit. In order to improve upon said device so that it is possible to determine in a simple manner the amount of current flowing into the load circuit, a current detection unit for determining the amount of current flowing into the load circuit prior to the measuring disconnection interval detects the duration of freewheeling time and calculates the value of said current therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.