Patent · US Expired

Method and arrangement for controlling the output of a load connected to an ac line voltage

US5955794A · kind A · utility

7Cited by

5References

11Claims

0Family size

Assignee

Gerhard Kurz · DE

Inventors

Detlef Schulz · Hamburg, DE
Gerhard Kurz · Calw, DE

Key dates

Filing date	Jul 14, 1997
Grant date	Sep 21, 1999
Priority date	—
Expiry date	Jul 14, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S388/917
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method and arrangement for controlling the output of electrical consumers connected to ac line voltage, especially of electric motors and the like, in which the output is changed by changing the phase control of the electric alternating magnitude supplied to the consumer. The extent of the firing angle determining the extent of the phase control is varied toward larger or smaller values around the given reference value of the firing angle, which reference value corresponds to the desired power consumption, so that asymmetry of the firing angle is produced with respect to time between two successive full waves, whereby odd-numbered harmonics are sharply reduced as even-numbered harmonics slowly increase.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.