Device for controlling power by phase control, and method...

H - Electricity – 02 – M

Patent

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Details

H02M 1/12 (2006.01) H02M 5/257 (2006.01) H02P 7/638 (2000.01)

Patent

CA 2495606

The invention relates to a device for controlling power by phase control of an alternating voltage supplying an electric consumer (14) and for reducing harmonic waves resulting from the phase control, particularly up to a range of 4 kHz, preferably in the range of the third harmonic wave. Said device comprises a first circuit element (12) (TRIAC), which is connected in series to the consumer (14) and which is controlled by a control device (20) in order to execute a phase control. The device is characterized in that a second circuit element (34) is connected in series to a resistor element (32), whereby the series connection is situated parallel to the first circuit element (12). The control device (20) is configured in such a manner that it controls the second circuit element (34) shortly before the first circuit element (12) and, for a short duration, switches it into the conducting state. The invention also relates to a method for reducing harmonic waves in the range of up to 4 kHz, preferably the third harmonic wave, during a power control involving phase-control.

L'invention concerne un dispositif de régulation de puissance par commande à phase d'un courant alternatif alimentant un récepteur électrique (14) et de réduction des ondes harmoniques provenant de ladite commande à phase, en particulier dans la plage allant jusqu'à 4 kHz, de préférence dans la zone de la troisième onde harmonique. Ledit dispositif comprend un élément de circuit (12) (TRIAC) monté en série avec ledit récepteur (14) et excité par un dispositif de régulation (20) destiné à effectuer une commande à phase. Ledit dispositif est caractérisé en ce qu'un second élément de circuit (34) monté en série avec un élément de résistance (32), ledit montage en série étant parallèle au premier élément de circuit (12). Ledit dispositif de régulation (20) est formé de manière à exciter le second élément de circuit (34) avant le premier élément de circuit (12) et à le commuter en position conductrice pour une courte durée. L'invention concerne, de plus, un procédé pour diminuer les ondes harmoniques dans la plage allant jusqu'à 4 kHz, de préférence la troisième onde harmonique, pendant une régulation de puissance par commande à phase.

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