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Title:
DEVICE FOR POWER ADJUSTMENT BY PHASE CONTROL AND METHOD FOR REDUCTION OF HARMONIC WAVES
Document Type and Number:
WIPO Patent Application WO2005062455
Kind Code:
A8
Abstract:
The invention relates to a device for power adjustment, by phase control of an alternating current, supplying an electrical user (14) and for reduction of the harmonic waves arising from the phase control, in particular, up to the region of 4 kHz, preferably in the range of the third harmonic wave, with a first circuit element (12) (TRIAC) in series with the user (14), controlled by a control device (20), for carrying out a phase control. The device is characterised in that a second circuit element (34) is provided in series with a resistance element (32), whereby the series circuit is arranged parallel to the first switching element (12) and the control device (20) is embodied such as to control the second switching element (34) shortly before the first switching element (12) and to switch for a short duration into the conducting state. The invention further relates to a method for reduction of harmonic waves in the region to 4 kHz, preferably the third harmonic wave, on power adjustment by means of phase control.

Inventors:
SCHULZ DETLEF (DE)
Application Number:
EP2004012047W
Publication Date:
October 20, 2005
Filing Date:
October 26, 2004
Export Citation:
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Assignee:
KURZ, GERHARD
SCHULZ, DETLEF
International Classes:
H02M1/12; H02M5/257; H02P7/295; H02P27/16; (IPC1-7): H02M5/257; H02M1/12; H02P7/295
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